Bolthole Index

Adams County, Colorado

Building permits, zoning and land rules in Adams County, Colorado

40Index Score / 100
#58 of 64 in Colorado

Unincorporated Adams County, Colorado requires building permits for construction and specified alterations, although listed minor projects are exempt1. The county also sets zoning and floodplain development permits for unincorporated land, while septic permits and inspections come from the Adams County Health Department234.

At a glance

Building permit
Required for construction and specified alterations, with listed minor-work exemptions1
Zoning
Yes, for unincorporated land, with district-specific standards25
Septic permit
Required for installations, expansions and most repairs; handled by the Adams County Health Department64
RV occupancy
Limited to one stay of up to 30 consecutive days per calendar year, in conjunction with a residence7
Well permit
Required for a new or replacement well through Colorado's Division of Water Resources8
Owner-builder
Owners may apply for building permits; required permits and compliance still apply9
Accessory dwelling unit
One ADU is allowed with a primary single-family home; the minimum size is 500 square feet1011

Who to call

Building permits

Adams County Building Safety Division

Building permits, plan review and inspections for construction in unincorporated Adams County

720.523.6800

4430 South Adams County Parkway, Brighton, Colorado 80601

Planning & zoning

Adams County Community & Economic Development Department, Planning & Development

Zoning, subdivision review and the county's Development Standards & Regulations for unincorporated Adams County

720.523.6800

cedd-plan@adamscountyco.gov

4430 South Adams County Parkway, Brighton, Colorado 80601

Septic permits

Adams County Health Department, Water Quality Program

Septic (OWTS) system permits, inspections and licensing of septic installers for Adams County

303.288.6816

ehwaterprogram@adamscountyco.gov

4430 South Adams County Parkway, Brighton, Colorado 80601

Contact details are copied from each office’s official page and were checked against it on October 12, 2026.

Off-grid gear

Going off-grid in Adams County means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in Adams County, Colorado?

Unincorporated Adams County requires a building permit before construction, enlargement, alteration, repair, moving, demolition, occupancy changes, and listed electrical, gas, mechanical, plumbing, and sign work12. Listed exemptions include decks no more than 30 inches above grade, storage sheds and gazebos no larger than 200 square feet, landscaping, and painting; larger accessory buildings and sheds require building permits12. Permitted construction receives inspections based on the approved plans, and applicants must schedule inspections at least 48 hours ahead13. An owner may apply for a building permit on the owner's property, but required building permits and proof of compliance still apply; contractors must register before pulling a building permit9. We could not confirm a general agricultural-building exemption; ask the Building Safety Division before relying on one14.

Who issues building permits in Adams County, and how do you reach them?

Adams County's Building Safety Division handles building permits and inspections for unincorporated land; call 720.523.680014. Thornton handles its own building permits, as do Arvada and Westminster, cities that reach into Adams County151617. Septic permits for Adams County properties remain with the Adams County Health Department18. Submit county building applications and project-specific documents through the E-Permit Center; the county accepts payment only through that portal1920. Adams County uses the 2024 International Codes for applications received on or after July 1, 2026; complete applications accepted earlier use the 2018 editions2122. Building-permit fees depend on labor-and-material valuation, with residential plan review costing 65% of the permit fee when submittal documents are required2324. Adams County requires a certificate of occupancy before a business operates and issues certificates for new construction or major renovations; that requirement does not establish a certificate requirement for every residential repair25. For applicable residential/ADU projects, contact the E-Permit Center after passing the final building inspection; required inspections and applicable health, stormwater and infrastructure sign-offs must be complete26.

Does Adams County have zoning?

Adams County requires prior authorization for land use and development in unincorporated areas; underlying and overlay zoning districts determine permitted uses and development standards, with boundaries shown on county zoning maps272829. Thornton, Commerce City, Federal Heights and Bennett set their own zoning30313233. Aurora, Arvada, Westminster and Lochbuie, which reach into Adams County, also set their own zoning; septic permits for properties in Adams County stay with the Adams County Health Department3435363718. County minimum lot sizes and setbacks vary by district3839. For Agricultural-1 accessory structures, a county variance case identifies a 100-foot front-property-line setback, while the district standards require 120 feet from a section line, subject to a Public Works exception; these are different measurements4041. Published lot-coverage percentages apply only to attached single-family dwellings42. Confirm the parcel's district, overlays and dimensions with Community & Economic Development before designing43.

How do septic permits work in Adams County?

The Adams County Health Department's Water Quality Program issues septic, or onsite wastewater treatment system (OWTS), permits countywide18. Installation, expansion and substantive repairs need a septic permit under Regulation O-2644. For a new septic connection, obtain a soils report and design from a designer who has passed the NAWT design course; some projects require a Colorado-registered professional engineer, and replacing only a tank does not require a full design45. Submit the application, design and soils report by email, online portal or in person, and pay the applicable fee45. Replacing risers, lids or distribution boxes needs no septic permit when the work does not add, repair, replace, expand, mitigate or abandon a septic tank, leach field, sewer line or effluent line46. Use a county-licensed installer, who requests final inspection; obtain approval before backfilling, then the designer's compliance letter and the septic use permit needed for house occupancy certification4547. Most sales or title transfers require a use/transfer septic permit and an NAWT- or NSF-certified inspection, usually including tank pumping647. About 57.1% of county soils are rated as not severely limited for a conventional drain field; evaluate the actual site48.

Can you live in an RV or tiny home on your land in Adams County?

Unincorporated Adams County limits RV occupancy to one stay of no more than 30 consecutive days per calendar year, in conjunction with a residence; parking, storage and setback rules also apply7. Tiny-home villages require a conditional-use permit and must provide housing for people experiencing or at risk of homelessness, or transitional housing; the minimum site is 0.5 acre with at least 10 homes49. Village homes must be 100–400 square feet, excluding lofts from the maximum, on qualifying foundations and built to the county's adopted IRC5049. Village standards do not establish permission for a standalone tiny home; ask Community & Economic Development about the proposed use43. County dwelling minimums include 1,800 square feet in Residential Estate, 1,250 in Residential-1-C and for Residential-2 single-family homes, and 600 in Mobile Home Dwelling51525354. Residential-3 minimums are 450 square feet for an efficiency unit, then 600, 750, 900 and 1,000 for one-, two-, three- and four-bedroom units respectively55. Colorado-approved tiny homes also need to satisfy local land-use requirements for long-term occupancy56.

What are the steps to build a home in Adams County?

  1. Confirm the parcel's zoning district, overlays, permitted use, lot size, setbacks, and applicable lot coverage with Adams County Community & Economic Development538394243.
  2. If any work is in a floodplain, obtain the required Adams County floodplain-development permit3.
  3. Submit the building application and required documents through the E-Permit Center20.
  4. Design to the 2024 International Codes now in effect for applications accepted on or after July 1, 202657.
  5. If the parcel lacks public sewer, obtain the soils report and septic design, then submit the septic application and fee to the Health Department45.
  6. For a new or replacement well, apply to the Colorado Division of Water Resources58.
  7. Complete building and septic inspections, secure the septic use permit where applicable, and request the required certificate of occupancy through the E-Permit Center134526.

What should you check before buying land in Adams County?

Adams County allows one ADU with a primary single-family home on an existing legal lot, subject to building, zoning and utility requirements5960. The ADU minimum is 500 square feet; the size limit is 40% of the home's floor area or 750 square feet, whichever is greater, with a 1,500-square-foot detached maximum and possible further district restrictions1160. A county Agricultural-3 variance case uses a 750-square-foot maximum, so ask Community & Economic Development which cap applies to your design6143. Water-district properties need a will-serve letter for an ADU; well and septic properties may need proof the well supports multiple units and a new or updated septic permit62. New or replacement wells require a Colorado Division of Water Resources permit8. Check floodplain status and whether a proposed land division requires subdivision review before closing363. Direct state-highway access requires a state access permit; we could not confirm the complete county driveway-permit rule, so ask Community & Economic Development about local-road access6443. The median annual property-tax bill is about $2,77065.

Watch-outs

  • An owner can apply for an Adams County building permit, but owner status does not remove required building permits or compliance obligations9.
  • An RV stay is limited to one period of no more than 30 consecutive days per calendar year and must be in conjunction with a residence, so it is not a substitute for a home during an open-ended build7.
  • Adams County had no short-term-rental regulations as of October 2025 unless a unit was proposed to host 12 or more people, but the county warned that future rules could apply to existing rentals66.

Sources

  1. Apply for a Building Permit, quoted and re-checked
  2. Planning & Development, quoted and re-checked
  3. adamscountyco.gov, quoted and re-checked
  4. Septic Systems, quoted and re-checked
  5. Development Standards & Regulations, quoted and re-checked
  6. Septic Systems, quoted and re-checked
  7. Vehicle Regulations, quoted and re-checked
  8. Well Permitting, quoted and re-checked
  9. Adams County Development Standards and Regulations, Chapter 2—Application and Permitting Procedures, quoted and re-checked
  10. Accessory Dwelling Units in Adams County, quoted and re-checked
  11. Accessory Dwelling Units in Adams County, quoted and re-checked
  12. Apply for a Building Permit, quoted and re-checked
  13. Adams County Business Guidebook, quoted and re-checked
  14. Adams County Building Safety Division (adamscountyco.gov)
  15. Thornton: Building Permits & Inspections (Adams County), quoted and re-checked
  16. Arvada: Building Permits | Arvada, CO (Adams County), quoted and re-checked
  17. Westminster: Permits & Licenses (Adams County), quoted and re-checked
  18. Septic Systems, quoted and re-checked
  19. Adams County Business Guidebook, quoted and re-checked
  20. Apply for a Building Permit, quoted and re-checked
  21. Adopted Building Codes, quoted and re-checked
  22. Adopted Building Codes, quoted and re-checked
  23. Apply for a Building Permit, quoted and re-checked
  24. Building, Plumbing, Mechanical, Electrical Permit Fee Schedule, quoted and re-checked
  25. Adams County Business Guidebook—February 2025, quoted and re-checked
  26. Certificate of Occupancy Requirements, quoted and re-checked
  27. Adams County Development Standards and Regulations, Chapter 1, quoted and re-checked
  28. Adams County Development Standards and Regulations, Chapter 3—Zone District Regulations, quoted and re-checked
  29. Adams County Development Standards and Regulations, Chapter 3, quoted and re-checked
  30. Thornton: Zoning Districts, Uses and Regulations (Adams County), quoted and re-checked
  31. Commerce City: Sec. 21-4300. R-1 Single-Family Detached Residential District (Adams County), quoted and re-checked
  32. Federal Heights: Federal Heights Municipal Code § 70-214, Permitted density in R-1 district (Adams County), quoted and re-checked
  33. Town of Bennett: Sec. 16-2-470. Land uses (Adams County), quoted and re-checked
  34. Aurora: 2.1 Districts Established (Adams County), quoted and re-checked
  35. Arvada: Arvada Land Development Code Sec. 2-1-3-3. RN: Residential neighborhood (Adams County), quoted and re-checked
  36. Westminster: Westminster Municipal Code § 10-1-12, Parking Restrictions (Adams County), quoted and re-checked
  37. Town of Lochbuie: Lochbuie Municipal Code Sec. 19-1-205, Compliance (Adams County), quoted and re-checked
  38. Adams County Development Standards and Regulations, Chapter 3, quoted and re-checked
  39. Accessory Dwelling Units in Adams County, quoted and re-checked
  40. Current Land Use Cases, quoted and re-checked
  41. Adams County Development Standards and Regulations, Chapter 3—Zone District Regulations, quoted and re-checked
  42. Adams County Development Standards and Regulations, Chapter 4, quoted and re-checked
  43. Adams County Community & Economic Development Department, Planning & Development (adamscountyco.gov)
  44. Septic Systems | Adams County Health Department, quoted and re-checked
  45. Septic Systems | Adams County Health Department, quoted and re-checked
  46. Septic Systems, quoted and re-checked
  47. Septic Systems, quoted and re-checked
  48. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
  49. Adams County Development Standards and Regulations, Chapter 4—Design Requirements and Performance Standards, quoted and re-checked
  50. Adams County Development Standards and Regulations, Chapter 4—Design Requirements and Performance Standards, quoted and re-checked
  51. Adams County Development Standards and Regulations, Chapter 3—Zone District Regulations, quoted and re-checked
  52. Adams County Development Standards and Regulations, Chapter 3—Zone District Regulations, quoted and re-checked
  53. Adams County Development Standards and Regulations, Chapter 3—Zone District Regulations, quoted and re-checked
  54. Adams County Development Standards and Regulations, Chapter 3—Zone District Regulations, quoted and re-checked
  55. Adams County Development Standards and Regulations, Chapter 3—Zone District Regulations, quoted and re-checked
  56. Consumers of Manufactured Homes and Tiny Homes - HUD (Colorado statewide rule), quoted and re-checked
  57. Apply for a Building Permit, quoted and re-checked
  58. Water Administration, quoted and re-checked
  59. Accessory Dwelling Units in Adams County, quoted and re-checked
  60. Accessory Dwelling Units in Adams County, quoted and re-checked
  61. Current Land Use Cases, quoted and re-checked
  62. Accessory Dwelling Units in Adams County, quoted and re-checked
  63. Adams County Development Standards and Regulations, Chapter 5, quoted and re-checked
  64. Access Permits | Frequently Asked Questions (Colorado statewide rule), quoted and re-checked
  65. Median property tax bill: Bolthole Index county data
  66. Accessory Dwelling Units in Adams County, quoted and re-checked

Written October 12, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

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Compared with neighboring counties

Like all 6 of its neighbors, Adams County requires a building permit for a home.

RuleAdams CountyArapahoe CountyMorgan CountyElbert CountyDenver CountyWeld CountyBroomfield County
Building permitRequiredRequiredRequiredRequiredRequiredRequiredRequired
County zoningYesYesYesYesYesYesYes
Septic permitsCounty Health Dept.County Public HealthNCHDECPHEDenver Dept. of Public Health & Env.County Dept. of Public Health & Env.Broomfield Health Protection Div.

County locator

Adams County in Colorado

40
County map
Adams County highlighted among the Colorado counties · colored by Index score

How Adams County scores

Seclusion37100% ev.
Self-Sufficiency1694% ev.
Admin Boringness4190% ev.
Durability70100% ev.
Property Autonomy75100% ev.
Carry Cost78100% ev.

Evidence strength: 97%. This reports direct-source completeness and fallback use; it is separate from the score and is not a confidence interval. How it works →

$486kTypical home
0.6%Property tax
$2,918Land / acre
15.6"Annual rain
16.3% of yrsSevere drought
11.7 / yr (+10.4)Mid-century 100°F days
23.2 daysMid-century dry spell
1.18" (+6%)Mid-century 1-day rain
1.3×Wildfire change factor
100%Forward climate coverage
$2,692Home insurance / yr
4.7% / yrInsurance growth
1.19%Nonrenewal rate
county median (2+ published ZIPs)Insurance basis
3,331,028People within 2 hr
13,482Radius comparison (15 mi)
457.1People / sq mi
2.1%Federal land
98.2%Land at 15% slope or less
57.1%Soils rated "not limited" for septic (strict USDA rating)
408,117 acWorkable land screen
5.9%Wooded land
50°FAvg temp

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Cities and towns in Adams County

Inside a city or town, that city usually issues building permits and sets zoning; the county’s rules above cover unincorporated land. Septic, wells and floodplain rules usually stay with the county or state everywhere.

Not yet researched: Brighton · Northglenn

Answers from the rulebook for Adams County

What the ordinances and state agencies actually say — one answer per question, each quoted from the official source and independently re-checked.

Adams County rules

  • Building permitRequired

    Building, structural, occupancy-change, and listed system work administered by Adams County.

    • Exceptions include listed minor work such as decks 30 inches or less, small sheds and gazebos, painting, minor repairs, and same-size window or door replacement.
    • Contractors working in unincorporated Adams County must be registered before pulling a permit.

    accessory building threshold: > 200 square feet (Buildings at or below 200 square feet are listed as not requiring a permit.) · deck threshold: > 30 inches above ground (Decks not more than 30 inches above ground are listed as exempt.)

    “A permit is required when you construct, enlarge, alter, repair, move, demolish, or change the occupancy of a building or structure, or when you erect, install, enlarge, repair, remove, convert, or replace any electrical, gas, mechanical, or plumbing system, or when you construct, place, or modify a sign.”
    3 more reviewed findings on this topic
    • Required — Construction and specified alterations in unincorporated Adams County.
      “A permit is required when you construct, enlarge, alter, repair, move, demolish, or change the occupancy of a building or structure, or when you erect, install, enlarge, repair, remove, convert, or replace any electrical, gas, mechanical, or plumbing system, or when you construct, place, or modify a sign.”
    • Required — Construction, enlargement, alteration, repair, moving, demolition, occupancy changes, and listed building-system work in Adams County’s permitting jurisdiction.
      “A permit is required when you construct, enlarge, alter, repair, move, demolish, or change the occupancy of a building or structure”
    • Required — Construction, alteration, repair, movement, demolition, occupancy changes, and listed building-system work in unincorporated Adams County.
      “A permit is required when you construct, enlarge, alter, repair, move, demolish, or change the occupancy of a building or structure”
  • Owner-builder exemptionConditional

    An owner acting as the applicant for a building permit for a structure on the owner's property in unincorporated Adams County.

    • A building permit remains required for covered construction, alteration, movement, demolition, or occupancy changes.
    • The owner may request the building permit application without limitation, but the applicant bears the burden of proving compliance with the County's standards and regulations.
    • Contractor information must be provided upon permit issuance when required.
    • All contractors doing work in unincorporated Adams County must be registered before pulling a permit.
    • Contractors must provide a Certificate of Liability Insurance to the County before permitting.
    • This source supports owner permit application and possible owner-performed work, but does not expressly use the term owner-builder exemption.
    “A building permit application may be requested by, without limitation, the owner(s) of the property on which the structure, sign, temporary building, or utility is to be erected, moved, placed, altered, excavated, or filled. Upon issuance of building permit, when required, contractor information shall be provided to the County.”
  • Building code adoptedAdopted (with conditions)

    2024 editions of the International Codes adopted by Adams County.

    • The Board of County Commissioners adopted the codes on April 21, 2026.
    • The codes go into effect July 1, 2026.
    • Incorporated municipalities may have separate code authorities.

    code edition: 2024 editions of the International Codes · effective date: 2026-07-01

    “Note: On April 21, 2026, the Board of County Commissioners adopted the 2024 editions of the International Codes. These codes will go into effect on July 1, 2026.”
    3 more reviewed findings on this topic
    • Adopted (with conditions) — Adams County building-code enforcement and construction in the county’s jurisdiction.
      “On April 21, 2026, the Board of County Commissioners adopted the 2024 editions of the International Codes. These codes will go into effect on July 1, 2026.”
    • Adopted (with conditions) — International building codes and minimum design criteria for Adams County ADU construction and related work.
      “On April 21, 2026, the Board of County Commissioners adopted the 2024 editions of the International Codes.”
    • Adopted (with conditions) — County-administered building codes in unincorporated Adams County.
      “On April 21, 2026, the Board of County Commissioners adopted the 2024 editions of the International Codes. These codes will go into effect on July 1, 2026. Complete building permit applications received and accepted prior to July 1st, 2026, will be reviewed under the 2018 editions.”
  • InspectionsRequired

    Inspections for permitted construction in unincorporated Adams County.

    • The applicant is responsible for scheduling inspections after permit issuance.
    • Inspections must be scheduled 48 hours in advance online or by telephone.

    advance scheduling: >= 48 hours

    “A series of inspections will be required depending on the scope of work detailed within your approved plans outlined in your building permit.”
  • Certificate of occupancyLimited

    Businesses operating in, and new construction or major renovations receiving Adams County building permits and inspections in unincorporated Adams County.

    • A Certificate of Occupancy is needed before a business can operate.
    • The Certificate of Occupancy may be obtained the day following completion of the final building inspection only if all conditions have been met.
    • A new Certificate of Occupancy may be needed if the occupant load, sprinkler system, usage classification, or other stated condition changes.
    • For new construction or major renovations, the project must previously have received a proper building permit and inspections.
    • The source does not establish that every residential alteration, repair, or other project requires a Certificate of Occupancy.
    “A CO is needed before a business can operate. [...] A CO is also administered with the completion of new construction or major renovations”
    2 more reviewed findings on this topic
    • Required — Residential/ADU and commercial projects requiring an Adams County certificate-of-occupancy submission.
      “It is the applicant’s responsibility to contact the E-Permit Center at epermitcenter@adamscountyco.gov once a Final Building Inspection has been passed.”
    • Limited — Residential and commercial projects requiring a county Certificate of Occupancy.
      “It is the applicant’s responsibility to contact the E-Permit Center at epermitcenter@adamscountyco.gov once a Final Building Inspection has been passed. The applicant is required to submit the following documents in order, as a single document.”
  • County-wide zoningPresent (with conditions)

    County zoning administered by Adams County in unincorporated Adams County.

    • The county page expressly limits the division’s zoning and land-use compliance responsibility to unincorporated portions of the county.
    • Municipal zoning rules may apply inside incorporated municipalities.
    “The division is primarily responsible for ensuring that land uses within the unincorporated portions of the county are developed in compliance with the county’s adopted codes and regulations”
    One more reviewed finding on this topic
    • Present (with conditions) — County zoning and development regulation for unincorporated Adams County.
      “These standards and regulations shall apply to the development and use of all unincorporated lands within the jurisdictional boundary of Adams County, Colorado”
  • Zoning districtsPublished (with conditions)

    Underlying and overlay zone districts in unincorporated Adams County.

    • The DSR lists underlying zone districts and overlay zone districts.
    • The cited Chapter 3 edition is dated February 21, 2023.
    • Zone and overlay district boundaries are shown on Adams County zone district maps.
    “the unincorporated areas of Adams County are divided into the following underlying defined zone districts:”
    2 more reviewed findings on this topic
    • Published (with conditions) — Adams County zoning and overlay districts for unincorporated land.
      “The uses permitted in each zone or overlay zone district are specifically designated in Section 3-07 through 3-37.”
    • Published (with conditions) — County zoning districts and associated development standards for unincorporated Adams County.
      “View the current Development Standards & Regulations in Municode”
  • Minimum dwelling sizeSpecified

    Dwellings in the Residential-3 (R-3) District in unincorporated Adams County.

    • The minimum varies by dwelling type within the R-3 District.
    • The Development Standards state that Chapter 4 standards apply unless inconsistent with Section 3-15.

    efficiency-unit minimum floor area: >= 450 square feet · one-bedroom minimum floor area: >= 600 square feet · two-bedroom minimum floor area: >= 750 square feet · three-bedroom minimum floor area: >= 900 square feet · four-bedroom minimum floor area: >= 1000 square feet

    “The minimum floor area of an efficiency unit in a Residential-3 District shall be four-hundred-fifty (450) square feet. [...] The minimum floor area of a four-bedroom unit in a Residential-3 District shall be one thousand (1,000) square feet.”
    7 more reviewed findings on this topic
  • Minimum lot sizeSpecified

    Minimum lot sizes vary by Adams County unincorporated zone district.

    • The applicable zone district and official zoning map control.
    • The standards apply to unincorporated lands unless expressly exempted.
    “ZONE DISTRICT MINIMUM LOT SIZE MAXIMUM DENSITY MINIMUM DENSITY MINIMUM F.A.R. MINIMUM LOT WIDTH”
  • SetbacksDistrict specific (with conditions)

    Structure setbacks applicable by zone district in unincorporated Adams County.

    • The applicable setback depends on the property’s zone district and project facts.
    “You may reach out to the Adams County Planner of the Day to inquire about your zone district and relevant setback regulations: CEDD-Plan@adamscountyco.gov.”
    2 more reviewed findings on this topic
    • Specified — Agricultural-1 zoning district in unincorporated Adams County.
      “Variance to allow an accessory structure to be 33 feet from the front property line where 100 feet is required within the Agricultural-1 zone district.”
    • Specified — Unincorporated Adams County zone districts, including Agricultural-1.
      “The minimum setback from a section line for all accessory structures in an Agricultural-1 District shall be one-hundred-twenty (120) feet.”
  • Lot coverageSpecified

    Lot coverage for specified residential uses in unincorporated Adams County.

    • The cited percentages apply to attached single-family dwellings; other uses and districts may have different standards.

    principal structure lot coverage: 70 percent · accessory structures lot coverage: 25 percent · combined structures lot coverage: 80 percent

    “MAXIMUM LOT COVERAGE 1. Principal Structure: 70% 2. Accessory Structures: 25% 3. Structures Combined: 80%”
  • Living in an RVLimited

    Inhabiting motor homes, trailers, fifth wheels, and other recreational vehicles in Adams County zone districts.

    • The use may occur one time for a maximum of thirty consecutive days within a calendar year.
    • The RV use must be in conjunction with a residence.
    • Separate storage, parking, public-right-of-way, surface, and setback rules apply.
    • Public-right-of-way parking is limited to 24 hours, and the same vehicle may not be moved and re-parked within a five-mile vicinity for six months.

    maximum consecutive occupancy: 30 days (one time within a calendar year)

    “Motor homes, trailers, 5th wheels, and other recreational vehicles may be inhabited one time for a maximum of thirty (30) consecutive days within a calendar year.”
  • Tiny homesLimited

    Occupancy of tiny homes in a tiny home village in unincorporated Adams County.

    • Tiny home villages are allowed only through an approved Conditional Use Permit.
    • The village must serve housing purposes for people experiencing homelessness, people at risk of homelessness, or transitional housing options within the County.
    • A Neighborhood Meeting is required as part of the Conditional Use Permit application.
    • Tiny home villages may be approved through a Conditional Use Permit in all Adams County zone districts.
    • The minimum lot size is one-half (1/2) acre.
    • A development may not be approved with fewer than ten (10) homes.
    • Each owner must designate a responsible agent; the owner may designate themselves.
    • A parking and circulation plan is required, with at least one space for every three homes and one space for every employee, subject to adjustment by the Board of County Commissioners through the Conditional Use Permit.
    • An operations plan is required.
    • At least 200 square feet of open space per unit is required, with up to 60 square feet allowed as private open space and the remainder common open space.
    • Each tiny home must be between 100 and 400 square feet, excluding lofts.
    • Minimum ceiling height is 6 feet 8 inches.
    • Minimum spacing between homes is 10 feet.
    • Construction must conform to the IRC as adopted by Adams County, and each tiny home must be placed on a qualifying foundation.
    • Additional emergency-escape, bufferyard, setback, trash, common-facility, animal, and outdoor-storage standards apply.

    minimum lot size: >= 0.5 acre · minimum number of tiny homes: >= 10 homes · tiny home size: 100-400 square feet (lofts excluded from the maximum) · minimum ceiling height: >= 6 feet 8 inches · minimum spacing between homes: >= 10 feet · minimum parking: per 1 space per 3 homes (also requires 1 space per employee; the Board of County Commissioners may increase or decrease parking through the Conditional Use Permit)

    “Tiny home villages are only allowed through an approved Conditional Use Permit and must conform to the following requirements: [...] The purpose of tiny home villages is to grant flexibility in building form and site design requirements for providers of housing for people who are experiencing homelessness or are at risk of becoming homeless or to provide for transitional housing options within the County.”
  • Accessory dwellingsAllowed (with conditions)

    Accessory dwelling units on existing legal lots with a single-family home.

    • The ADU must be accessory to the existing home and cannot be sold individually.
    • Minimum ADU size is 500 square feet.
    • An ADU may not exceed 40% of the home’s floor area or 750 square feet, whichever is greater; detached ADUs have a 1,500-square-foot maximum.
    • Water and sanitation districts, or the Health Department and DWR for septic and well properties, may impose site-specific requirements.

    minimum ADU size: >= 500 square feet · detached ADU maximum size: <= 1500 square feet

    “ADUs are permitted on an existing legal lot as an accessory use to a single-family home in any zone district.”
    3 more reviewed findings on this topic
    • Limited — Accessory dwelling units in the Agricultural-3 zoning district in unincorporated Adams County.
      “Variance to allow for a 2,040 square foot accessory dwelling unit where the maximum size allowed is 750 square feet. The property is designated within the Agricultural-3 zone district.”
    • Allowed (with conditions) — Accessory dwelling units where single-family homes are allowed in Adams County.
      “ADUs are permitted on an existing legal lot as an accessory use to a single-family home in any zone district.”
    • Allowed (with conditions) — Accessory dwelling units for a primary single-family home in unincorporated Adams County.
      “ADUs are permitted on an existing legal lot as an accessory use to a single-family home in any zone district.”
  • Who permits septicCounty (with conditions)

    Onsite wastewater permitting and inspection administered by the Adams County Health Department.

    • The Health Department applies Adams County Regulation O-26 and references Colorado OWTS Regulation 43.
    • The source describes systems for properties not served by public sewer.
    “Our team will review the submitted forms. If no issues are found, we will issue a permit and send it to the email address listed on the application.”
    One more reviewed finding on this topic
    • County (with conditions) — On-site wastewater treatment system permitting and inspection administered by the Adams County Health Department.
      “Our team will review the septic system design and issue the permit if the application complies with Regulation O-26.”
  • Septic permitRequired

    Installation, expansion, and major or minor repair of onsite wastewater treatment systems serving individual homes and businesses that are not served by a public sewer system in Adams County.

    • Submit the septic-system permit application with the septic-system design and soils report, by email, online portal, or in person.
    • A soils report and system design must come from a designer who passed the NAWT septic-system design course; a Colorado-registered professional engineer may be required in some cases.
    • A full design is not needed to replace only a septic tank.
    • Pay the appropriate permit fee.
    • The Adams County Health Department issues the permit only if the application complies with Regulation O-26.
    • Use an installer licensed by the Adams County Health Department; final inspection occurs before backfilling approval.
    • After passing inspection, the designer must send a letter that the system matches the design; the Health Department then issues a use permit, which Adams County Code Compliance requires for the house to be certified for occupancy.
    • Regulation O-26 was adopted by the Adams County Board of Health, replaced Regulation O-22, and became effective January 5, 2026. The Board resolution states that the revision was proposed to ensure compliance with Colorado's amended statewide minimum standards in 5 CCR 1002-43, effective June 15, 2025.
    “Please note that for permits related to installation, expansion, major repairs, and minor repairs, you will fill out the Application for a Septic System Permit.”
    5 more reviewed findings on this topic
    • Not required — A repair that does not involve adding, repairing, replacing, expanding, mitigating, or abandoning a septic tank, leach field, sewer line, or effluent line in Adams County.
      “For any repair that does not involve adding, repairing, replacing, expanding, mitigating, or abandoning any septic tank, leach field, sewer line, or effluent line, a permit is not required. Examples include replacing septic tank risers, septic tank lids, and distribution boxes.”
    • Required — New, repair, expansion, and other specified onsite wastewater work in Adams County.
      “Please note that for permits related to installation, expansion, major repairs, and minor repairs, you will fill out the Application for a Septic System Permit.”
    • Required — Connecting a new home or business to a septic system within the Adams County Health Department's administered area.
      “Submit a septic system permit application to EHWaterProgram@adamscountyco.gov along with the septic system design and soils report. Alternatively, you may submit these items through the online portal or in person at our office. Pay the appropriate permit fee. You can pay this online when applying, over the phone when our team contacts you, or in person at our office. Our team will review the septic system design and issue the permit if the application complies with Regulation O-26.”
    • Not required (with conditions) — Repairs to an existing septic system that do not involve specified septic-system components in Adams County.
      “For any repair that does not involve adding, repairing, replacing, expanding, mitigating, or abandoning any septic tank, leach field, sewer line, or effluent line, a permit is not required. Examples include replacing septic tank risers, septic tank lids, and distribution boxes.”
    • Required — New septic systems, expansions, major and minor repairs, and applicable use or transfer situations.
      “Please note that for permits related to installation, expansion, major repairs, and minor repairs, you will fill out the Application for a Septic System Permit.”
  • Septic inspectionRequired

    Installation completion and applicable septic use or transfer inspections.

    • The installer requests a final inspection near completion.
    • For sale or transfer, an NAWT- or NSF-certified inspector must inspect the system, and in most cases the tank must be pumped out.
    “Once the installer is near completion, they will request a final inspection. If no issues are found in the final inspection, we will approve the installer’s backfilling of the system.”
    One more reviewed finding on this topic
    • Required — Final inspection for new or modified septic systems and certified inspection for most transfers of title.
      “Once the installer is near completion, they will request a final inspection.”
  • Mandatory utility hookupConditional

    Accessory dwelling units and similar additional residential units in Adams County.

    • A water-district will-serve letter is required where the property is in a water district, acknowledging water service and sewer service if applicable.
    • A well permit must show that a residential well can support multiple units where applicable.
    • A septic permit specific to the ADU or an updated septic permit is required where the property uses septic.
    “If you are in a water district, you will need to provide a will-serve letter from that water district”
  • Subdividing landRegulated (with conditions)

    Subdivision plats and subdivision design in unincorporated Adams County.

    • Subdivision plats must conform to the subdivision design standards and referenced county engineering standards.
    • Planning must consider applicable comprehensive plans, zoning, area character, and neighborhood requirements.
    “5‐03‐01‐01 SUBDIVISION TO CONFORM TO DESIGN STANDARDS”
  • Building in a floodplainRequired

    Development within Adams County floodplain areas under the county's floodplain and flood control overlay regulations.

    • All development in the floodplain requires an Adams County permit and the county advises obtaining a floodplain permit before building.
    • Construction in the floodway, including new, substantially damaged, or improved buildings in the floodplain, must meet special requirements.
    • Under the county Development Standards and Regulations, a floodplain use permit is the only authorization for erecting, moving, placing, or altering a structure; placing fill; storing or processing materials or equipment; or changing a watercourse channel within the flood control overlay zone district.
    • The applicant must demonstrate full compliance with the county standards and regulations and approval criteria.
    • The application is reviewed by the Director of Community and Economic Development; no application is processed if taxes due are unpaid.
    • The floodplain use permit is valid for six months from issuance unless fully and properly acted upon and completed; one six-month extension may be granted if requested at least 30 days before lapse.
    • The official checklist lists a $200 residential fee and a $500 non-residential fee, due after a complete application is received.
    • The checklist requires an elevation certificate after the structure is built and before issuance of a Certificate of Occupancy, if applicable.

    residential floodplain use permit fee: 200 USD (Due after complete application is received) · non-residential floodplain use permit fee: 500 USD (Due after complete application is received) · permit validity period: 6 months (Unless fully and properly acted upon and completed) · permit extension: 6 months (One extension may be granted; request must be filed at least 30 days before lapse)

    “All development in the floodplain requires an Adams County permit.”
  • Short-term rentalsLimited

    Short-term rental use of an ADU in Adams County.

    • The county page states that an ADU can act as a short-term rental.
    • As of October 2025, the county did not have short-term-rental regulations unless a unit proposed to host 12 or more people.
    • The page states that future regulations may require existing short-term rentals to comply.

    occupancy threshold: >= 12 people (county regulations stated to apply when a unit proposes to host 12 or more people)

    “As of October 2025, the county does not have regulations related to short-term rentals unless any unit proposes to host 12 or more people.”
  • Permit feesPublished (with conditions)

    Adams County building permit and plan-review fees.

    • Building permit valuation includes estimated materials and labor and final valuation is determined by the building official.
    • Residential plan review is 65 percent of the permit fee when submittal documents are required.
    • An additional 25 percent plan review fee may apply after more than three resubmittals.
    • Reinspection fees may apply when work is not ready or inspections are rescheduled or cancelled after the cutoff.

    residential plan review fee: 65 percent of permit fee (When submittal documents are required by section 106.1.)

    “R108.6 Plan review fee. When submittal documents are required by section 106.1, a plan review fee equal to 65 percent of the permit fee shall be charged on all permits.”
    One more reviewed finding on this topic
    • Published (with conditions) — County building permit fees.
      “Building permit fees are based on the valuation of the project. The valuation is the total cost of the materials and labor. Some projects are calculated using a cost/square foot equation.”
  • Permit processPublished (with conditions)

    Adams County building-permit application process.

    • Applications are submitted through the E-Permit Center.
    • Required documents include a site plan, architectural plans and details, and mechanical/electrical/plumbing plans where applicable.
    • Contractors must be identified and registered before issuance.
    • The county reviews comments before permit issuance.
    “General Commercial Industrial Permits: Building permits can be submitted on the county’s E-Permit Center website. Permit Application Submittal: Plan review fees must be paid through the E-Permit Center. Please review the appropriate checklist to verify all the required documentation is included in your submittal.”
    One more reviewed finding on this topic
    • Published (with conditions) — Adams County building-permit process.
      “The Community and Economic Development Department (CEDD) only asks for and accepts payment through the ePermit Center.”

Colorado rules that apply here

  • Building heightDistrict specific (with conditions)

    Municipal zoning districts in Colorado where the municipality adopts building-height or story regulations.

    • The applicable height or story limit is determined by the municipality's zoning regulations and district classification.
    • The statute provides authority but no statewide numeric height limit.
    • Height restrictions do not apply to existing buildings under the cited municipal zoning authority, except as stated for new growth of vegetation.

    building height or number of stories: local regulation (No statewide numeric limit specified)

    “the governing body of each municipality is empowered to regulate and restrict the height, number of stories, and size of buildings and other structures”
  • Manufactured homesAllowed (with conditions)

    Installation and resulting residential use of HUD-code manufactured homes and mobile homes in Colorado, subject to Colorado Division of Housing requirements and local zoning or building requirements.

    • HUD homes must be certified by the applicable State Administrative Agent for installation in Colorado; imported units are monitored by the State Administrative Agent of the state from which they are imported, rather than necessarily by Colorado's SAA.
    • A HUD home may be installed anywhere in Colorado only where local zoning allows it.
    • Local jurisdictions may require site mitigation to meet local wind and snow loads, but the mitigation cannot directly affect or change the construction of the home itself.
    • The Division of Housing regulates installation and installation inspections for HUD homes; mobile-home foundation and structural construction requirements are regulated by local jurisdictions with active building departments.
    • The state minimum HUD design criteria listed by the source are Wind Zone 1, Thermal Zone 3, and Middle Roof Load Zone (30 psf).

    wind zone: 1 zone · thermal zone: 3 zone · roof load zone: 30 psf (Middle Zone)

    “HUD homes [...] can be installed anywhere in Colorado as long as the local zoning allows for it.”
  • Off-grid sanitationLimited

    Sanitation for dwellings and occupied structures statewide that is provided without connection to a sewage treatment works.

    • The structure must have adequate facilities for sanitary disposal of sewage.
    • An OWTS may be used subject to applicable permit, inspection, construction, installation, alteration, and use requirements.
    • Construction of new cesspools is prohibited.
    • Septage removed during maintenance or cleaning must be disposed of at an approved site and in an approved manner.
    “No person shall construct or maintain any dwelling or other occupied structure that is not equipped with adequate facilities for the sanitary disposal of sewage.”
  • Well permitRequired

    Every new groundwater-diverting well in Colorado, including residential wells, subject to statutory exemptions and basin-specific rules.

    • The Division of Water Resources administers groundwater permitting and issues permits.
    • Applicants must complete the appropriate application and pay the associated fee.
    • Statutory exemptions and additional Denver Basin or Designated Basin rules may affect the requirement or permit conditions.
    • In many areas, a well may also require an augmentation plan if its priority is not sufficient to divert in priority.

    complete-application review time: <= 49 days (DWR states review of complete new and replacement applications may take up to 49 days)

    “Every new well in the state that diverts groundwater must have a well permit.”
    2 more reviewed findings on this topic
    • Required — New or replacement water wells serving property in Adams County.
      “DWR reviews new and replacement well permit applications in the order they are received, and review of complete applications may take up to 49 days.”
    • Required — New groundwater wells in Colorado, including Adams County.
      “Every new well in the state that diverts groundwater must have a well permit.”
  • Driveway accessRequired

    Direct residential access from a property to a Colorado state highway, and construction, relocation, closure, modification, or change in use of access points to state highways.

    • Direct access from a house to a state highway requires an access permit.
    • Some state-highway access categories require access from a lesser street or by easement from a parent parcel whenever possible.
    • Level 1 permits cover single-family residential/agricultural permits; Level 2 covers commercial property and developments exceeding 20 vehicular trips per day without roadway improvements; Level 3 covers commercial property requiring roadway improvements.
    • Level 1 fees are $50, Level 2 fees are $100, and Level 3 fees are $300.
    • No fees are charged to local government applications or political subdivisions.
    • There is no upfront charge to review an Access Permit Application.
    • The permittee is responsible for roadway-improvement costs required with issuance of an access permit.
    • Performance-bond requirements apply only to private projects; local agencies are not required to comply, although CDOT regions may require a bond at their discretion.

    Level 1 access permit fee: 50 USD (Single-family residential/agricultural permits) · Level 2 access permit fee: 100 USD (Commercial property permits and developments exceeding 20 vehicular trips per day without roadway improvements) · Level 3 access permit fee: 300 USD (Commercial property permits requiring roadway improvements)

    “If you want the house to have direct access off of the state highway, then you will need an access permit.”
  • Campground & park staysAllowed (with conditions)

    Temporary overnight camping, including parking a motor home or traveler, on land and water under the control of Colorado Parks and Wildlife, including state parks and state recreation areas.

    • The source addresses lands and waters under the control of the Division of Parks and Wildlife, not all public or private land statewide.
    • Camping includes parking a motor vehicle, motor home, or traveler for the apparent purpose of overnight occupancy.
    • A commission-issued permit may be required; the statute defines permits to include campground permits and electrical hookup permits.
    • The state may charge fees for required passes or permits for use of any state park or state recreation area where supervision, maintenance, or specified facilities warrant a fee.

    overnight occupancy: true (Camping definition includes the parking of a motor vehicle, motor home, or traveler for the apparent purpose of overnight occupancy.) · permit types: campground permits; electrical hookup permits

    “Develop state parks and state recreation areas suitable for such recreational activities as camping, [...] "Camping" means [...] the parking of a motor vehicle, motor home, or traveler”
  • county zoning authorityGeneral

    Colorado counties adopting zoning plans for all or any part of unincorporated territory.

    • The county planning commission may make the zoning plan; in a county having a county planning commission, it must do so upon order by the board of county commissioners.
    • The zoning plan may regulate districts or zones, including building location, height, bulk, size, lot coverage, lot size, open spaces, population density, building and land uses, and access to sunlight for solar energy devices.
    • The plan may include regulations for uses on or along storm or floodwater runoff channels or basins only when the channel or basin has been designated and approved by the Colorado water conservation board, to lessen or avoid hazards from storm or floodwaters.
    • The statute applies to unincorporated territory and does not describe incorporated cities or towns as within this county zoning grant.
    “zoning all or any part of the unincorporated territory within such county”
  • county building authorityGeneral

    Colorado counties adopting and enforcing building codes and requiring building permits in designated unincorporated areas.

    • A board of county commissioners may adopt a building code in all or part of the county, but the area must not be within the limits of an incorporated city or town.
    • Buildings or structures used solely to shelter agricultural implements, farm products, livestock, or poultry may be excepted from the building code and permit requirement.
    • Before adoption, the county planning commission may designate part or all of the county for the building code upon request from the board of county commissioners; the board must hold a public hearing and publish notice once weekly for four consecutive weeks.
    • After adoption of the building code, construction, reconstruction, alteration, or remodeling in the designated area requires a building permit, except for the agricultural-shelter exception.
    • The board must fix a reasonable schedule of building-permit fees; no permit fee may be charged unless a qualified inspector actually performs an inspection.
    • Plans must conform to the building code, and plans and specifications generally must bear the seal of a Colorado-licensed architect or engineer unless exempted by section 12-120-403.
    • Every county adopting or updating a building code must adopt and enforce an energy code meeting or exceeding one of the three most recent International Energy Conservation Code versions under section 30-28-211.
    • The 2025 amendment to section 30-28-204 is effective January 1, 2026 and adds accessibility requirements for substantially amended or updated county building codes, with an exception for compliant one- and two-family dwellings and townhomes.
    “A board of county commissioners is authorized to adopt ordinances and a building code”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission — ask the county directly.

  • Camping on your land — Temporary camping on private land in unincorporated Adams County.
  • Agricultural exemption — Agricultural exemptions from building or land-use requirements in unincorporated Adams County.

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Water rights & wells in Adams County

Whether a new home can legally get its own water here — the sub-state groundwater regime, from Colorado’s water agency.

Over-appropriated / declining

The aquifer here is over-appropriated and declining. A domestic well is usually still permit-exempt, but long-term supply is a genuine risk.

Household wellExempt up to a limit

A household obtains water via a permit-exempt small-capacity well (15 gpm) under CRS 37-92-602 outside designated basins or CRS 37-90-105 inside them; on a 35-acre-plus lot limited outside/stock/1-acre irrigation is allowed.

Limit: Household-use-only well: 15 gpm, ≤0.33 acre-ft/yr, indoor only. Domestic well on a 35+ acre tract: 15 gpm, ≤1 acre-ft/yr.

Colorado DWR — Guideline 2023-1, Exempt & Small-Capacity Wells ↗
  • Lost Creek Designated Ground Water Basinpartial of county

    Lost Creek designated basin NE of Denver; over-appropriated alluvial aquifer, new large-capacity appropriations limited. Small-capacity/domestic wells still permitted.

    Colorado DWR — Designated Basins / Division 3 ↗
  • Kiowa-Bijou Designated Ground Water Basinpartial of county

    New wells require a Ground Water Commission permit; new large-capacity alluvial appropriations limited by prior appropriation, while Denver Basin bedrock is allocated by overlying acreage on a 100-year aquifer life.

    Colorado DWR — Designated Basins ↗
  • Denver Basin nontributary bedrock aquifers (Dawson, Denver, Arapahoe, Laramie-Fox Hills)partial of county

    Nontributary bedrock groundwater is allocated to the overlying landowner on an assumed 100-year aquifer life and needs a well permit; finite and steadily declining.

    Colorado Water Knowledge (CSU) — Groundwater Rights ↗

Prior-appropriation state (first in time, first in right). Groundwater rules change and basin boundaries follow the aquifer, not the county line — confirm current well and appropriation rules with the Colorado state water agency before you buy or drill.Groundwater governance as of Jul 2026, cited to each administering agency.

Living off-grid in Adams County, Colorado

Is Adams County a good place to live off-grid or homestead?

Adams County scores 40/100 on the Bolthole Index, a marginal county profile. Its strengths: manageable long-term carry cost and a stronger property-autonomy legal backdrop. Watch-outs: thin water margin (15.6″/yr rainfall) and sparse surroundings — about 13,482 people within 15 miles.

Do you need a building permit in Adams County, Colorado?

Adams County generally requires a residential building permit, and it enforces county zoning. Onsite septic is permitted by Adams County Health Department - Environmental Health (Water Quality / OWTS program). Owner-builders may act as their own contractor to build their home. These answers are quoted from official sources and independently re-checked. Rules change and cities within the county differ — always confirm with the county before you buy or build.

Can you live in an RV or tiny home on your land in Adams County?

Living in an RV on your own land in Adams County is limited to specific cases: Inhabiting motor homes, trailers, fifth wheels, and other recreational vehicles in Adams County zone districts. The use may occur one time for a maximum of thirty consecutive days within a calendar year. The RV use must be in conjunction with a residence. A tiny home is limited to specific cases. Confirm with the county before relying on it.

How much does land cost in Adams County, Colorado?

Land in Adams County runs about $2,918 per acre, based on the latest county data.

What is the water situation in Adams County?

Adams County gets about 15.6" of rain a year, with severe drought in roughly 16.3% of years. On water rights, Adams County lies in the Lost Creek Designated Ground Water Basin — Lost Creek designated basin NE of Denver; over-appropriated alluvial aquifer, new large-capacity appropriations limited. Small-capacity/domestic wells still permitted..

How remote is Adams County?

A typical private-land location has about 13,482 people within 15 miles and 4,573,341 within 100 miles. These radius catchments are the published fallback where road routing is unavailable.

How Adams compares in Colorado

Compare side-by-side →See all 64 Colorado counties ranked →