Unincorporated Gilpin County, Colorado requires a building permit for every primary structure and every habitable accessory structure, regardless of size1. Most unincorporated land is zoned RR or RS, and Gilpin County Public Health regulates septic systems locally23. Private-property camping is limited to 30 days per calendar year with a camping permit4.
At a glance
- Building permit
- Required for every primary structure and every habitable accessory structure1
- Zoning
- County zoning applies in unincorporated areas; most land is RR or RS52
- Septic
- Gilpin County Public Health regulates OWTS permits and inspections locally36
- RV camping
- Up to 30 days per calendar year on private property with a camping permit4
- Tiny home
- A temporary tiny home cannot be permanent housing; a habitable structure needs code and permit review7
- Minimum home size
- No county minimum or maximum for a single-family home, subject to code, zoning and lot coverage8
- Owner-builder
- State law exempts only an owner's repair or maintenance work from a county contractor license; it is not a blanket new-home exemption9
- Private well
- A state Division of Water Resources permit is required, subject to statutory and basin-specific rules1011
Who to call
Building permits
Gilpin County Community Development, Building Division
Building permits, plan review, inspections, building-code compliance and contractor registration in unincorporated Gilpin County
communitydevelopment@gilpincounty.org
203 Eureka Street, P.O. Box 366, Central City, Colorado 80427
Zoning
Gilpin County Community Development, Planning & Zoning
Zoning, setbacks, lot coverage, subdivision, camping permits and planning applications
203 Eureka Street, P.O. Box 366, Central City, Colorado 80427
Septic permits
Gilpin County Public Health, OWTS Program
OWTS construction and repair permits, inspections, title-transfer use permits and septic records
203 Eureka Street, P.O. Box 366, Central City, Colorado 80427
Roads & driveways
County-road questions and driveway, right-of-way and road-construction permit applications
255 Braecher Park Road, Black Hawk, Colorado 80422
Contact details are copied from each office’s official page and were checked against it on October 10, 2026.
Off-grid gear
Going off-grid in Gilpin County means bringing your own water and power. The kit we’d start with:
- Water Crystal Quest Filter any source — well, rain, or creek — to drinking-clean.
- Power Bluetti Solar generators and home battery backup for living off the grid.
- Septic Soil percolation test kit Run your own perc test before paying an engineer — the first thing a septic office asks about.
- Water Well water test kit Bacteria, nitrates, hardness — know what the well on a parcel is really pumping.
These are affiliate links — we may earn a commission, at no cost to you. As an Amazon Associate, Bolthole Index earns from qualifying purchases.
Do you need a building permit in Gilpin County, Colorado?
Every primary residential or commercial structure in unincorporated Gilpin County needs a building permit regardless of size, as does any accessory structure used for habitation1. A non-habitable accessory structure under 200 square feet does not require a building permit, but must meet zoning and development standards; residentially zoned vacant land requires a primary structure before accessory structures1. Attached residential decks also require building permits regardless of size or height12. Gilpin County has adopted building codes, which the Building Division enforces through plan review and inspections1314. Colorado's county contractor-license exemption covers an owner's repair or maintenance work, without establishing a blanket exemption for new-home construction; ask the Building Division how contractor registration applies9.
Who handles Gilpin County building permits and inspections?
Gilpin County Community Development's Building Division handles building permits, plan review and inspections in unincorporated Gilpin County14. Call (303) 582-5831 or email communitydevelopment@gilpincounty.org; the mailing address is 203 Eureka Street, P.O. Box 366, Central City, Colorado 8042714. Building applications and inspections use online portals; seasonal full-plan review for new homes can take up to 12 weeks, so ask the Building Division for the current review estimate15. Building-permit costs combine the building permit fee, plan-check fee, zoning-review fee and other applicable charges; plan review costs 65% of the building permit fee16. Planning & Zoning provides a parcel map, and Community Development assigns vacant-property addresses during the building-permit process17.
Does Gilpin County have zoning?
County zoning applies to unincorporated Gilpin County, where most land is RR Resource Residential or RS Residential Subdivision2. Inside Black Hawk, the city sets its own zoning; Gilpin County Public Health remains the countywide OWTS regulator183. RR has a 20-acre minimum lot size and RS a 5-acre minimum; subdivisions producing parcels below 35 acres must also satisfy county subdivision regulations1920. RR setbacks are 30 feet front, 15 feet side and rear, and 55 feet from an unplatted road centerline; RS requires 30 feet from all property lines and 55 feet from that road centerline21. A surveyor must verify setbacks when a primary structure or ADU is within 10 feet of the required setback21. Gilpin County sets no minimum or maximum single-family home size, but building codes, zoning and a 25% total structure-coverage cap apply822. In RR and RS, one attached or detached ADU may follow the primary home, with floor area no more than 50% of the primary dwelling; the ADU must share utilities and cannot have a separate address23.
How do septic permits work in Gilpin County?
Gilpin County Public Health regulates onsite wastewater treatment systems (OWTS) locally under Colorado's Regulation 43 framework3. In unincorporated Gilpin County, an OWTS construction permit is required for installation, upgrade, expansion, replacement or covered repair; routine maintenance and sewer-line replacement that does not enter a system component are excluded6. Major repairs require engineered plans, including repairs to systems older than 30 years or lacking engineered plans6. Call 720-617-7779 or email myaun@gilpincounty.org for septic-permit and inspection questions24. Covered home sales require septic inspection and a Use Permit before going under contract, subject to exceptions25. Only 0% of mapped county soils receive the USDA 'not limited' rating for conventional drain fields; plan for a site evaluation and potentially an engineered system, rather than assuming septic is impossible26. A new residence cannot substitute a composting or incinerating toilet for a compliant water-carrying OWTS27.
Can you live in an RV or tiny home in Gilpin County?
Private-property camping in unincorporated Gilpin County requires a camping permit and is limited to 30 days per calendar year4. Public campsite rental is not allowed by right; a campground or RV park requires Special Use approval in RR or an eligible commercial district28. Temporary tiny homes, yurts and tents cannot serve as permanent structures or be rented publicly; habitable structures require building permits and current-code compliance7. Colorado tiny-home certification remains subject to local zoning and is specific to the installation site29. We could not confirm a local manufactured-home occupancy rule; ask Planning & Zoning about the proposed unit and parcel before purchase. Residential rentals under 30 consecutive days require a county license to advertise and operate; capped licenses have a waitlist, so ask Planning & Zoning about availability before budgeting rental income30.
What are the steps to build a home in Gilpin County?
- Use Planning & Zoning's parcel map and confirm the zoning district, lot size, setbacks and allowed dwelling plan before design3121921.
- Establish legal access; a dwelling more than 150 feet from a publicly maintained road must meet the applicable driveway or road standard32. Public Works accepts driveway and road-access permit applications and can be reached at 303-582-5004 or gcroads@gilpincounty.org33.
- Arrange the OWTS site work and secure the required county septic permit before relying on the house layout6.
- Apply to the Colorado Division of Water Resources if the parcel needs a groundwater well10.
- Submit the building plans and building-permit application to the Building Division; ask the Building Division for the current plan-review timeline15.
What should you check before buying land in Gilpin County?
Start with parcel zoning, legal access and a current survey because buildability depends on district standards, setbacks, topography and access documentation312132. Treat septic feasibility as a purchase contingency because 0% of mapped county soils receive the USDA “not limited” rating for conventional drain fields; a site evaluation or engineered system may still make septic feasible26. Only 16.9% of the land is at a 15% slope or less, 90.8% is wooded and 45% is federal land, so a seemingly large mountain parcel may have a much smaller practical building envelope353637. Confirm whether the parcel needs a state well permit and whether the available water supply fits the intended use10. Ask Planning & Zoning about floodplain status because we could not confirm Gilpin County's local floodplain-development procedure. Existing non-maintained access roads that fail driveway standards are not grandfathered, so an existing track does not establish compliant access for a new home32.
Watch-outs
- A private parcel is not an unlimited campsite: unincorporated Gilpin County requires a camping permit and caps private-property camping at 30 days per calendar year4.
- A composting or incinerating toilet does not replace the compliant water-carrying OWTS required for a new residence in unincorporated Gilpin County27.
- Colorado's owner-work exemption covers repair or maintenance, not a blanket exemption for constructing a new home; ask the Building Division how contractor registration applies9.
Sources
- Building, quoted and re-checked
- Planning & Zoning, quoted and re-checked
- Septic and Well Information, quoted and re-checked
- Planning & Zoning, quoted and re-checked
- Planning & Zoning | Gilpin County, quoted and re-checked
- Septic and Well Information, quoted and re-checked
- gilpincounty.colorado.gov, quoted and re-checked
- Planning & Zoning, quoted and re-checked
- Colorado Revised Statutes 2026, Title 30, § 30-11-125 (Colorado statewide rule), quoted and re-checked
- Septic and Well Information, quoted and re-checked
- Water Administration (Colorado statewide rule), quoted and re-checked
- Building, quoted and re-checked
- Building, quoted and re-checked
- Gilpin County Community Development, Building Division (gilpincounty.colorado.gov)
- Building, quoted and re-checked
- Gilpin County 2026 Comprehensive Fee Schedule, quoted and re-checked
- Gilpin County Community Development, Planning & Zoning (gilpincounty.colorado.gov)
- Black Hawk: Municipal Code, Sec. 16-70 — Rural Residential use regulations (Gilpin County), quoted and re-checked
- Planning & Zoning, quoted and re-checked
- Planning & Zoning, quoted and re-checked
- gilpincounty.colorado.gov, quoted and re-checked
- gilpincounty.colorado.gov, quoted and re-checked
- Planning & Zoning, quoted and re-checked
- Gilpin County Public Health, OWTS Program (gilpincounty.colorado.gov)
- Septic and Well Information, quoted and re-checked
- 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
- gilpincounty.colorado.gov, quoted and re-checked
- Planning & Zoning, quoted and re-checked
- Consumers of Manufactured Homes and Tiny Homes - HUD (Colorado statewide rule), quoted and re-checked
- Short Term Rentals, quoted and re-checked
- Planning & Zoning, quoted and re-checked
- Building, quoted and re-checked
- Gilpin County Public Works (gilpincounty.colorado.gov)
- Title 25 - Public Health and Environment - Colorado Revised Statutes 2024 (Colorado statewide rule), quoted and re-checked
- Share of land at 15% slope or less: Bolthole Index county data
- Wooded share of land: Bolthole Index county data
- Federal land share: Bolthole Index county data
Written October 10, 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.