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

Yes. Every occupied structure in unincorporated Alamosa County needs a permit, as does any structure over 200 square feet¹. Permits also cover fences over 6 feet, solar panels, demolition, reroofing, decks and patios, stucco or re-siding, residential additions and onsite wastewater systems¹.

Since July 1, 2023, Alamosa County has applied the 2018 residential, commercial and energy codes to covered work in its unincorporated area¹. New-construction, remodel and addition permit prices depend on construction valuation calculated from square footage⁶. The published flat fees are $150 per building for reroofing, $100 for solar PV, $500 for an onsite wastewater permit and $0 for demolition when CDPHE permit documentation is provided⁶.

The county's rules describe unincorporated land only⁷. Septic permits for a parcel inside a city or town are a separate question; ask that municipality and Land Use & Building who handles them¹.

Alamosa County Land Use & Building combines the county planning and building functions for unincorporated Alamosa County and provides an online permit portal⁴. Call the office at 719-589-3812 or visit 8999 Independence Way Suite 100, Alamosa, CO 81101⁴.

A residential building-permit submittal needs proof of legal water, proof of legal sanitation, a county driveway permit or CDOT access permit where the road or driveway requires one, HOA approval if an HOA is active, and a complete set of construction drawings¹. Minimum plan-review periods are 7 business days for residential plans, 14 business days for commercial plans and 72 hours for onsite wastewater plans¹.

Inspection requests need at least 24 hours' notice; call 719-589-3812 to schedule¹. Rough electrical and plumbing approvals from state inspectors must precede the county framing inspection⁵. A new home cannot receive its certificate of occupancy until the county has documentation for sanitation, legal water, final plumbing and final electrical approval⁵.

Yes. Unincorporated Alamosa County has county zoning, and a parcel's allowed uses and development standards depend on its district². Setbacks, maximum building height and lot coverage vary by district and sometimes by use, so a single countywide setback number is not reliable². Any residential use, including accessory living areas, needs at least 500 square feet of floor area, and manufactured homes first occupied in the county after July 1, 2010 also need a 600-square-foot footprint².

Manufactured-home rules also depend on the unit and district: single-section homes may be no more than 15 years old and are allowed in RMH but not in RE, RL, RM or RH, while multi-section homes must date from 1976 or later and fit most districts; every manufactured home needs a permanent foundation with engineer-stamped drawings¹. Use the zoning map and confirm the parcel's district with Land Use & Building before ordering a home². In the Rural (RU) district the minimum residential lot size is 35 acres, while the R, RE and RMH districts set far smaller lots². A land division may require county subdivision and plat review, and every county subdivision requires a final plat; any division creating lots smaller than 35 acres goes through the subdivision process, and a minor subdivision may not create more than four lots^2,7. Land in the RU zone that qualifies as active agriculture may be divided under a separate agricultural process, limited to two additional building tracts or lots per 80 acres². Inside the city of Alamosa, the city's own Unified Development Code sets zoning instead of the county³.

Alamosa County Land Use & Building issues septic (onsite wastewater treatment system) permits in unincorporated areas, a separate approval from the building permit¹. If a parcel is inside a city or town, ask that municipality and Land Use & Building which of them handles the septic permit¹. A new home needs an OWTS unless the applicant documents service from East Alamosa Water & Sanitation District, and an OWTS must be installed by a county-licensed installer^1,5. The published OWTS permit fee is $500, and the permit is valid for one year from issuance¹.

The fee includes one construction inspection; additional inspections can cost extra, and system components must remain exposed until inspection unless the inspector approves otherwise in advance¹. Arrange the inspection at least one business day ahead¹. Only 5.2% of mapped soils avoid a severe USDA limitation rating for a conventional drain field, so investigate parcel-specific feasibility early⁸. Alamosa County does not allow composting, chemical or incinerating toilets for a new home in place of approved sanitation⁵.

On private property, Alamosa County limits occupancy in an RV, trailer, camper, tent or other temporary structure to a cumulative 180 calendar days per year². Approval requires the camping unit to connect to an approved OWTS, or the site must provide permitted sanitation connected to that system; private camping cannot become paid or commercial hosting². Year-round RV use is addressed separately for compliant commercial campgrounds and RV parks, not ordinary private parcels².

A tiny home on a trailer is treated as an RV and is limited to temporary or seasonal use with Land Use approval⁵. A tiny home on a foundation still has to meet the county's 500-square-foot minimum floor area for any residential purpose, so very small units may not qualify as a dwelling². Take the exact unit specifications to Land Use & Building before purchasing⁴.

1. Confirm the zoning district, allowed residential use, setbacks and the 500-square-foot minimum floor area with Land Use & Building².
2. Establish a legal water source and keep the well permit, well application or district-service documentation for the county application⁵.
3. Obtain OWTS approval and use a county-licensed installer unless East Alamosa Water & Sanitation District will serve the home^1,5.
4. Secure an access permit from Road & Bridge for county-road access, or a CDOT permit for direct state-highway access^7,9.
5. Submit proof of legal water and sanitation, any access permit and complete construction drawings through the county permit portal^1,4.
6. Schedule building and OWTS inspections at the required stages, leaving septic components exposed for inspection¹.
7. Provide the water, sanitation, plumbing and electrical documentation required for the certificate of occupancy⁵.

Confirm legal water before closing: Alamosa County requires proof such as a well permit, completed well application or East Alamosa Water & Sanitation District service documentation for a dwelling⁵. Check soils and OWTS feasibility early because only 5.2% of mapped soils escape a severe limitation rating for a conventional drain field⁸.

Verify legal road access and maintenance responsibility; Alamosa County Road & Bridge issues access permits, while properties on state or federal highways need a CDOT access permit^7,9. Check the parcel against the county flood-hazard maps because land disturbance, construction or development in a county special-flood-hazard area requires a floodplain development permit². If a seller proposes splitting land, confirm plat status and subdivision approval rather than relying on an informal boundary description². Finally, budget around a median annual property-tax bill of $968 and an effective rate of about 0.4%⁸.