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

Yes. Unincorporated Washington County requires building permits for residences, including mobile and manufactured homes, as well as outbuildings such as barns, shops and machine sheds, grain bins, garages, additions, roofed decks and screened porches¹. Washington County has not adopted a county building-code ordinance, but applicants remain responsible for following Uniform Building Codes and current state standards². The published building-permit form lists $100 for buildings except Use by Special Review, a 1.5% use tax calculated on 48% of total building value, and a $150 Use by Special Review application fee; confirm current charges with the Land Use Office because the manufactured-home fee figures conflict⁵. Colorado's owner exemption for a county contractor-licensing program is limited to repair or maintenance on the owner's property; it does not create an exemption for constructing a new home⁷.

The Washington County Land Use Office administers permits for buildings, structures and land-use changes in the unincorporated county¹. The office is on the second floor of the courthouse at 150 Ash Avenue in Akron and can be reached at (970)345-2701 ext 234¹. Applications ask for property, access, proposed use, acreage, water and sewer information, while land-use applications proceed through the Planning Commission before the Board of County Commissioners¹. Washington County publishes separate applications for general construction and mobile or manufactured homes, and a foundation permit may also be required for the latter¹. Inside Akron, the town handles building permits under its own adopted code⁹. Septic systems in Akron remain under the Northeast Colorado Health Department; public sewer availability can restrict approval of a septic system^3,4.

Yes. Washington County’s Land Use Office administers zoning and land-use approvals in unincorporated Washington County; Akron sets its own zoning inside town limits^1,10. Septic approval remains with the Northeast Colorado Health Department⁴. Multiple residences on less than 35 acres require Use by Special Review and health-department septic approval, rather than establishing a general minimum lot size¹. Land-use applications go through the Planning Commission before the Board of County Commissioners¹. For community-business, mixed-use and industrial proposals under Use by Special Review, the approved site plan sets the minimum lot size¹¹. Commercial Mobile Radio Service facilities and electrical-generation wind towers under special review must stand at least 250 feet plus tower height from any residence; that is a use-specific rule, not an ordinary residential setback¹¹. We could not confirm ordinary residential lot-size, setback or minimum floor-area standards; ask the Land Use Office for the parcel’s requirements.

The Northeast Colorado Health Department administers onsite wastewater systems in Washington County⁴. Obtain its permit before installing, altering, expanding or repairing a septic system; the application requires a site evaluation and plot plan³. Site work requires three percolation holes and two soil-profile test pits, with at least one pit evaluated by a department environmental health specialist¹². The listed fee is $500 for either a new system or repair^12,13. Colorado requires final inspection before use¹⁴. About 62.1% of county soils are rated not very limited for a conventional drain field, but parcel testing still controls the design^12,15. Call the OWTS Program at (970) 867-4918 ext. 2262¹⁶.

Washington County's rule for residential RV occupancy on private land could not be confirmed; ask the Land Use Office about the parcel and intended duration. Colorado-approved tiny homes may be used for long-term living when the Division of Housing approves the plans, applicable standards are met and local zoning allows the unit⁶. We could not confirm a county-specific tiny-home occupancy rule; ask the Land Use Office before buying a unit. For mobile and manufactured homes, unincorporated Washington County requires a building permit, applicable installation inspection and an installation insignia before occupancy⁵. Permanent utilities cannot be released before that insignia is attached⁵.

1. Confirm zoning, proposed use and any special review with the Land Use Office¹.

1. Secure water and septic documentation; Colorado generally requires a permit for a new groundwater well, and the county requires evidence of a water source or well permit, and a health-department septic permit, or proof that those applications have started, before issuing a manufactured-home building permit^1,5,8.

1. Obtain the required septic permit and complete the site evaluation, percolation and soil-profile work^3,12.

1. Submit the correct county building application and confirm current fees^1,5.

1. Arrange the final septic inspection before use; for a manufactured home, arrange the county inspection before occupancy and complete placement and licensing inspection within 6 months after signing^1,5,14.

1. For direct state-highway access, obtain a Colorado Department of Transportation permit before construction¹⁷.

Confirm legal access, zoning and proposed use first; the county's exact local driveway-permit rule could not be confirmed, so ask the Land Use Office before altering an entrance. Every new Colorado groundwater well generally needs a state permit, subject to statutory and basin-specific exceptions⁸. Washington County receives about 16.2 inches of precipitation annually, and severe drought occurs in roughly 19.5% of years, making legal water central to due diligence¹⁵. About 93.9% of the land has slopes of 15% or less, while wooded cover is 0%, so wind exposure may matter on buildable-looking ground¹⁵. The effective property-tax rate is about 0.4%, with a median annual bill near $890¹⁵. Check mapped flood risk because applicable local rules must meet or exceed federal minimum criteria¹⁸.