Unincorporated Custer County, Colorado requires a zoning permit for a new home and other covered construction, even though the county has not adopted a structural building code12. Planning & Zoning handles the permit process and septic approvals34. Before excavation or foundation work begins, confirm the parcel's zoning, water source, septic approval and access requirements15.
At a glance
- Building permit
- A county zoning permit is required for new homes and other covered construction1
- Building code
- No structural building code adopted for unincorporated Custer County2
- Zoning
- Yes; unincorporated land is zoned by density6
- Septic (OWTS)
- A county septic permit and inspection are required for new systems78
- RV living
- Primary-residence use needs a Tiny House / RV Permit; recreational use without approved septic is time-limited9
- Tiny home
- A tiny house on a foundation used as a primary residence needs a special county permit10
- Owner-builder
- No exemption was confirmed; ask Planning & Zoning before relying on one11
- Well
- Every new groundwater-diverting well needs a Colorado well permit, subject to statutory and basin-specific rules12
Who to call
Building permits
Custer County Planning & Zoning Department
Zoning and land-use applications, dwelling and accessory-structure permits, subdivision review, and septic (OWTS) permits for Custer County
Custer County Courthouse, 205 S 6th Street, Westcliffe, CO 81252
Roads & driveways
Custer County Road & Bridge Department
Driveway-access, excavation and other permits for work involving county roads and rights-of-way
213 N 4th Street, Westcliffe, CO 81252
Contact details are copied from each office’s official page and were checked against it on September 27, 2026.
Do you need a building permit in Custer County, Colorado?
Yes, but Custer County's terminology matters: unincorporated Custer County requires a zoning permit for dwellings, additions and other covered construction, while the county has not adopted a structural building code12. A zoning permit must be issued before excavation, construction, reconstruction, a square-footage-increasing repair or remodel, or a change of use begins1. A dwelling permit also depends on an approved septic permit, a legally adequate and physically available water source, and compliance with the zoning resolution1.
The absence of a county structural code does not remove project closeout requirements: applicable rough-in and final electrical and plumbing inspections must be complete, and a county compliance inspection checks the structure, sewage disposal, water and other zoning commitments13. The structure must be dried in within 2 years and completed within 3 years after permit issuance13.
Who issues Custer County building permits, and how do you reach them?
Custer County Planning & Zoning administers land-use rules and building permits and also reviews septic systems, so it is the first office to contact for a rural home project4. The office is in the Custer County Courthouse at 205 S 6th Street in Westcliffe and accepts permit applications through its online system4.
Applications may be submitted online or by mail or in person, and a zoning application requires the applicable fee, proof of ownership, a plot plan, floor plan and elevation drawing14. Permit fees are non-refundable, and the county collects a 2% use tax when a building or septic permit is issued, based on estimated building-material purchases15. Custer County has not confirmed an owner-builder exemption, so a person planning to serve as their own builder should ask Planning & Zoning what trade licensing, state inspections and documentation will apply before filing114.
Does Custer County have zoning?
Unincorporated Custer County is zoned by density, and county zoning governs land and structures there6. The published districts have minimum lot areas of 80 acres in Zone I Grape Creek, 35 acres in Zone II Sangre de Cristo, 10 acres in Zone III Wet Mountain/Hardscrabble and 5 acres in Zone IV Foothills, subject to the resolution's adjustments and other requirements16.
Setbacks vary with parcel size: land of at least 3 acres generally uses a 50-foot property-line or roadway-easement setback, land between one-half acre and 3 acres uses 25 feet, and land of one-half acre or less uses 10 feet17. Where no recorded roadway easement exists, the larger-parcel rule also requires 60 feet from the driven roadway surface17. Structures are limited to 30 feet in height, and on parcels larger than one-half acre all structures together may cover no more than 10% of the gross parcel1819. Ask Planning & Zoning to identify the parcel's district and verify the site plan before design work begins4.
How do septic permits work in Custer County?
Custer County Planning & Zoning reviews and approves on-site wastewater treatment systems and processes septic permits, modifications and repairs4. A new septic system requires a county permit before construction, and a dwelling permit cannot issue without an approved septic system7. Modifications, repairs and upgrades require inspection and approval, while Colorado also requires a final inspection after permitted work is complete and before the system is used820.
Site feasibility deserves early attention: only 3.4% of Custer County soils are rated without severe limitations for a conventional septic drain field21. That soil rating does not decide an individual parcel, but it makes a site evaluation and possible engineered design a sensible early contingency21. A residence or business needs a county-approved permanent septic system before occupancy, and a vault system requires a variance approved by the Custer County Board of Health22. Wastewater cannot be discharged onto the ground or into creeks, streams or other water bodies22.
Can you live in an RV or tiny home in Custer County?
An RV used as a primary residence in unincorporated Custer County requires a special Tiny House / RV Permit and remains subject to zoning rules9. Recreational occupancy of an RV, tent, teepee, yurt or similar structure may not exceed 90 days during the 12-month period beginning January 1 without an approved septic system; setbacks still apply, and Planning & Zoning may require proof of disposal at an approved dump site23.
A tiny house on a foundation used as a primary residence also requires a special county permit and must meet the applicable septic, water, setback and height requirements10. Colorado Division of Housing-regulated tiny homes intended for long-term living need state plan approval before construction and still must satisfy local zoning24. Custer County has not confirmed a minimum dwelling floor area, so ask Planning & Zoning to review the proposed design rather than assuming that a small footprint is automatically allowed4.
Building a home in Custer County: the steps, in order
- Ask Planning & Zoning to confirm the parcel's zoning district, minimum lot area, setbacks, height limit and allowed residential use25161718.
- Establish a legally adequate, physically available water source; every new groundwater-diverting well in Colorado needs a state well permit, subject to statutory and basin-specific rules112.
- Complete the septic site work and obtain county OWTS approval before the dwelling permit7.
- Resolve access: Road & Bridge handles driveway permits involving county roads, while direct access to a state highway requires a CDOT permit52627.
- Submit the zoning-permit application with the fee, ownership proof, plot plan, floor plan and elevation drawing before excavation begins141.
- Complete applicable electrical and plumbing inspections, the septic inspection and the county compliance inspection before closing the permit and occupying the home138.
What should you check before buying land in Custer County?
Start with buildable area, not acreage alone: confirm the zoning district, parcel boundaries, road easements, setbacks and the combined structure-coverage limit with Planning & Zoning2517194. Confirm legal and physical access as well, because access intersecting a county-maintained road requires a county permit and inspection, while a state-highway connection goes through CDOT5.
Water and septic can determine whether the plan works: Colorado requires a permit for a new groundwater-diverting well, and only 3.4% of county soils are rated without severe limitations for a conventional drain field1221. Floodplain-development requirements were not confirmed in the county materials, so ask Planning & Zoning which floodplain map and local review apply to the parcel before closing4. The county is sparsely settled at 7.5 people per square mile, 53.6% of its land is wooded and 46.8% has a slope of 15% or less, making terrain, wildfire exposure and year-round access practical parts of due diligence282930. The effective property-tax rate is about 0.4%, with a median annual bill of about $1,3003132.
Watch-outs
- Custer County has no adopted structural building code, but covered work still needs a zoning permit before excavation or foundation work begins21.
- Only 3.4% of county soils are rated without severe limitations for a conventional drain field, so test septic feasibility before committing to a house site21.
- Custer County has not confirmed an owner-builder exemption or a minimum dwelling floor area; ask Planning & Zoning before relying on either assumption114.
Sources
- Building Permits & Applications | Custer County CO, quoted and re-checked
- Custer County Zoning Resolution, quoted and re-checked
- Planning & Zoning | Custer County CO (2026 county census)
- Custer County Planning & Zoning Department (custercounty-co.gov)
- Road & Bridge | Custer County CO, quoted and re-checked
- Custer County Zoning Resolution, quoted and re-checked
- Building Permits & Applications | Custer County CO, quoted and re-checked
- Building Permits & Applications | Custer County CO, quoted and re-checked
- Building Permits & Applications | Custer County CO, quoted and re-checked
- Building Permits & Applications | Custer County CO, quoted and re-checked
- (2026 county census)
- Water Administration (Colorado statewide rule), quoted and re-checked
- Custer County Zoning Resolution, quoted and re-checked
- Building Permits & Applications | Custer County CO, quoted and re-checked
- Building Permits & Applications | Custer County CO, quoted and re-checked
- Custer County Zoning Resolution, quoted and re-checked
- Custer County Zoning Resolution, quoted and re-checked
- Custer County Zoning Resolution, quoted and re-checked
- Custer County Zoning Resolution, quoted and re-checked
- Title 25 - Public Health and Environment - Colorado Revised Statutes 2024 (Colorado statewide rule), quoted and re-checked
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- Custer County Zoning Resolution, quoted and re-checked
- Custer County Zoning Resolution, quoted and re-checked
- Consumers of Manufactured Homes and Tiny Homes - HUD (Colorado statewide rule), quoted and re-checked
- Zoning Regulations | Custer County CO, quoted and re-checked
- Custer County Road & Bridge Department (custercounty-co.gov)
- Access Permits | Frequently Asked Questions (Colorado statewide rule), quoted and re-checked
- Population density: Bolthole Index county data
- Wooded share of land: Bolthole Index county data
- Share of land at 15% slope or less: Bolthole Index county data
- Effective property tax rate: Bolthole Index county data
- Median property tax bill: Bolthole Index county data
Written September 27, 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.