Bolthole Index

Eagle County, Colorado

Zoning, building permits and septic rules in the Town of Basalt, Colorado

The Town of Basalt, Colorado zones its own land under Chapter 16 of its municipal code1, and the Town's own Building Department takes building permit applications for work inside town limits2. Septic permits inside Basalt are unconfirmed; the nearest rules we could verify are Eagle County's3. Eagle County's own building permits cover only unincorporated land4.

At a glance

Building permits
Issued by the Town of Basalt Building Department; the county's building division covers only unincorporated areas24
Zoning
Town zoning under Chapter 16 of the Basalt Municipal Code, with R-1, R-2 and R-3 districts among those named15
Septic
Not confirmed inside town limits; county rules require an OWTS permit for new installations, alterations or repairs3
Maximum home size
5,000 total square feet for any dwelling unit, in any zone district1
Accessory dwellings (R-3)
Special review approval, lots of 8,000 sq ft or more, never above 1,000 sq ft in most cases6
Tiny homes
Colorado allows Division of Housing-approved tiny homes subject to local zoning; Basalt's own tiny-home rule is unconfirmed7

Who to call

Building permits

Town of Basalt Building Department

Building permit applications, plan review, inspections and contractor licensing inside the Town of Basalt

970-927-4701

101 Midland Avenue, Basalt, CO 81621

Zoning

Town of Basalt Planning Department

Zoning questions, zoning maps and development applications inside the Town of Basalt

970-927-4701

101 Midland Avenue, Basalt, CO 81621

Septic permits

Eagle County Environmental Health

County OWTS (septic) permits and contractor licensing in Eagle County; call to confirm whether a Basalt address is covered

970-328-8755

environment@eaglecounty.us

551 Broadway, Eagle, CO 81631

Contact details are copied from each office’s official page and were checked against it on October 16, 2026.

Off-grid gear

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

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Does Basalt, Colorado have zoning, and what does it mean for home size and lots?

Yes. The Town of Basalt adopts its own zoning in Chapter 16 of the Basalt Municipal Code, and the rules apply to land inside town limits1. No dwelling unit may exceed 5,000 total square feet in any zone district, and some districts set tighter floor-area limits1.

The code sections we reviewed name the R-1, R-2 and R-3 Traditional Neighborhood/Hill districts; the full district list was not confirmed5. In R-3, newly subdivided lots need at least 6,000 square feet and 50 feet of width8. Accessory buildings in R-3 are capped at 20 feet, or 24 feet to the highest point of a pitched roof, whichever is lower9. R-3 setbacks for undeveloped lots follow the code's schedule of requirements10. Ask the Planning Department for your parcel's district11.

Do you need a building permit in Basalt, and who issues it?

Inside Basalt, the Town of Basalt Building Department handles building permit applications and the Town publishes permit checklists for new construction, remodels and additions2. The Town lists its current codes as the 2021 ICC and 2023 NEC, with local sustainable building regulations2. We could not confirm from the code text which small projects are exempt, or how owner-builders are treated inside town, so call the Building Department before you start2.

The county's rules do not apply here: the Eagle County Building Division inspects only unincorporated areas4. Basalt also sits partly in Pitkin County, so confirm which side of the line your parcel is on.

How do septic permits work inside Basalt?

Septic rules inside Basalt town limits are not confirmed. Colorado requires an on-site wastewater permit from the local public health agency for any building not served by a sewage treatment works, and requires a final inspection before occupancy12. Eagle County Environmental Health requires a permit for all new installations, alterations or repairs of an OWTS in Eagle County3, and systems must be designed by a Colorado Registered Professional Engineer13.

Whether your lot is on town sewer or needs a septic system, and which county's health office would permit it, we could not confirm. Ask Basalt Town Hall first2, then Eagle County Environmental Health14.

Can you live in an RV or tiny home in Basalt?

Basalt's general RV rule was not confirmed; the town code we reviewed addresses travel trailers only inside mobile home parks. Camping on Town property needs prior Town authorization, other camping needs the owner's permission, and a violation is a misdemeanor15.

Mobile home parks inside Basalt must cover at least 5 acres and stay at or under 7 units per acre16. Statewide, Colorado approves Division of Housing tiny homes for long-term living, but they must satisfy local zoning7. Basalt's own tiny-home rule is unconfirmed, so ask the Planning Department11.

Building a home in Basalt: the steps, in order

  1. Ask the Planning Department which zone district your parcel is in and what size, height and setback limits apply11.
  2. Check flood status: new residential construction in a special flood hazard area must have its lowest floor at least 1 foot above base flood elevation17.
  3. Settle sewer or septic with Town Hall and, for septic, Eagle County Environmental Health14.
  4. If the driveway meets a state highway, a state access permit is required18.
  5. Submit the permit application to the Town Building Department2.

What stays with Eagle County, and what to check before you buy near Basalt

Land outside Basalt's limits follows the county's rules instead; see the Eagle County page. In unincorporated Eagle County, the county runs zoning19 and its Building Division issues building permits4. Figures below are for Eagle County as a whole: the typical home value is about $1,316,03020 and the effective property tax rate is 0.4%21. Only 4.1% of county soils rate as not limited for a conventional septic drain field, so expect a site evaluation or engineered system on lots without sewer22.

Watch-outs

  • Septic, building permit exemptions, owner-builder rules, RV living and wells inside Basalt are unconfirmed, so call Basalt Town Hall at 970-927-4701 before relying on county rules2.
  • Basalt straddles Eagle and Pitkin counties, so the county that handles septic for your parcel depends on which side it lies3.

Sources

  1. Basalt Municipal Code Sec. 16-22.5 Maximum size for residential units (Town of Basalt), quoted and re-checked
  2. Town of Basalt Building Department (basalt.net)
  3. Water & Waste Water, quoted and re-checked
  4. Online or Paper Applications, Checklists, & Documents, quoted and re-checked
  5. Basalt Municipal Code Sec. 16-27 Supplemental requirements for R-3 Traditional Neighborhood/Hill District (Town of Basalt), quoted and re-checked
  6. Basalt Municipal Code Sec. 16-27 Supplemental requirements for R-3 Traditional Neighborhood/Hill District (Town of Basalt), quoted and re-checked
  7. Consumers of Manufactured Homes and Tiny Homes - HUD (Colorado statewide rule), quoted and re-checked
  8. Basalt Municipal Code Sec. 16-27 Supplemental requirements for R-3 Traditional Neighborhood/Hill District (Town of Basalt), quoted and re-checked
  9. Basalt Municipal Code Sec. 16-27 Supplemental requirements for R-3 Traditional Neighborhood/Hill District (Town of Basalt), quoted and re-checked
  10. Basalt Municipal Code Sec. 16-27 Supplemental requirements for R-3 Traditional Neighborhood/Hill District (Town of Basalt), quoted and re-checked
  11. Town of Basalt Planning Department (basalt.net)
  12. Title 25 - Public Health and Environment - Colorado Revised Statutes 2024 (Colorado statewide rule), quoted and re-checked
  13. Water & Waste Water, quoted and re-checked
  14. Eagle County Environmental Health (eaglecounty.us)
  15. Basalt Municipal Code Sec. 11-115 Camping or lodging on property without consent (Town of Basalt), quoted and re-checked
  16. Basalt Municipal Code Sec. 16-166 Mobile home park development standards (Town of Basalt), quoted and re-checked
  17. Basalt Municipal Code Sec. 16-363 Standard for special flood hazard areas (Town of Basalt), quoted and re-checked
  18. Access Permits | Frequently Asked Questions (Colorado statewide rule), quoted and re-checked
  19. Online or Paper Applications, Checklists, & Documents, quoted and re-checked
  20. Typical home value (Zillow): Bolthole Index county data
  21. Effective property tax rate: Bolthole Index county data
  22. 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

Written October 16, 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.

Answers from the rulebook for Town of Basalt

Town of Basalt’s own rules

  • Local zoningPresent

    Land inside Basalt town limits; Chapter 16 Zoning of the Basalt Municipal Code

    • Other individual zone districts may have more restrictive floor area limits than the Town-wide limitation.
    “No dwelling unit regardless of zone district shall be in excess of five thousand (5,000) total square feet.”
  • Zoning districtsPartial

    Zone districts inside Basalt town; R-1, R-2 and R-3 Traditional Neighborhood/Hill District are named in the code sections reviewed; full district list and schedule of requirements not opened

    “The following supplemental regulations shall apply to accessory dwelling units within the R-3 Traditional Neighborhood/Hill District:”
  • Minimum lot sizeSpecified

    R-3 Traditional Neighborhood/Hill District inside Basalt town, newly subdivided lots

    • For developed lots, the minimum is as in the schedule of requirements or as existing August 22, 1995, whichever is least restrictive

    minimum lot size: >= 6000 sq ft (developed lots) · minimum lot width: >= 50 ft (developed lots)

    “Minimum lot size shall be six thousand (6,000) square feet, and minimum lot width shall be fifty (50) feet for newly subdivided lots.”
  • SetbacksDistrict specific (with conditions)

    R-3 Traditional Neighborhood/Hill District inside Basalt town

    • Developed lots use the August 22, 1995 building envelope or the schedule, whichever is least restrictive
    • Reduced side yard setback possible by special review
    “for undeveloped lots with no existing structures, or for newly subdivided lots, the setbacks shall be as outlined in the schedule of requirements.”
  • Building heightSpecified

    Accessory buildings in the R-3 Traditional Neighborhood/Hill District inside Basalt town

    • Whichever results in a lower building height

    accessory building height: <= 20 ft (24 ft to highest point of pitched roof)

    “building height for accessory buildings located within this zone shall be no higher than the principal building on a lot, or twenty (20) feet with a restriction of twenty-four (24) feet to the highest point of a pitched roof, whichever results in a lower building height.”
  • Camping on your landLimited

    Camping on Town, other public, or private property inside Basalt town

    • Town property requires prior Town authorization
    • Other public or private property requires permission of the authorized officer or owner
    • Section does not apply to any dwelling as defined in Section 16-4
    • Violation is a misdemeanor
    “any person who fails to comply with any provision of this section shall be guilty of a misdemeanor”
  • Manufactured homesLimited

    Mobile home parks inside Basalt town; where mobile homes are allowed outside parks was not determined

    • Maximum gross density 7 units per acre
    • Non-HUD certified mobile homes are not allowed in the park except in storage areas
    • Minimum lot area for a mobile home 4,000 sq ft

    minimum park area: >= 5 acres · maximum gross density: <= 7 units per acre

    “the minimum area required for a mobile home park is five (5) acres.”
  • Accessory dwellingsLimited

    Accessory dwelling units in the R-3 Traditional Neighborhood/Hill District inside Basalt town

    • Subject to special review approval
    • Deed restriction requiring one of the two units be resident-occupied unless an eligible exception applies
    • Size restricted per schedule of requirements and never above 1,000 sq ft unless pre-existing or approved before August 22, 1995

    minimum lot size for ADU: >= 8000 sq ft · maximum ADU size: <= 1000 sq ft (legally approved before August 22, 1995 or pre-zoning existing units)

    “Only lots eight thousand (8,000) square feet or larger in size shall be eligible to request special review approval for an accessory dwelling unit.”
  • Building in a floodplainRequired

    New construction and substantial improvements in special flood hazard areas inside Basalt town

    • Residential lowest floor elevated one foot above base flood elevation where BFE data provided
    • Elevation certified by a Colorado professional engineer, architect or land surveyor

    elevation above base flood: >= 1 ft (where BFE data provided)

    “new construction and substantial improvement of any residential structure shall have the lowest floor (including basement), electrical, heating, ventilation, plumbing, and air conditioning equipment and other service facilities (including ductwork), elevated to one (1) foot above the base flood elevation”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Town of Basalt or Eagle County directly.

  • Building permit — Building permits inside Basalt town
  • Owner-builder exemption — Owner-builder rules inside Basalt town
  • Building code adopted — Building code inside Basalt town
  • Inspections — Building inspections inside Basalt town
  • Certificate of occupancy — Certificates of occupancy inside Basalt town
15 more unanswered
  • Minimum dwelling size
  • Lot coverage
  • Living in an RV
  • Tiny homes
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption
  • Driveway access
  • Short-term rentals
  • Permit fees
  • Permit process

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.

Unanswered questions are usually a sign that Town of Basalt publishes no rule on the point, not that none exists. Eagle County’s page lists the county offices to call.

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