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

Yes. Unincorporated Grand County requires a permit for construction, alteration, relocation, repair, a change of use or demolition of a building or structure¹. Limited exceptions include detached sheds and playhouses of 120 square feet or less, fences not over six feet and ordinary finish work, but they carry detailed conditions, so confirm the specific project before starting¹. The county inspects new construction and remodeling for compliance with local building and fire codes⁸. Grand County adopted the 2021 Building Codes and the 2025 Colorado Wildfire Resiliency Code with local amendments, effective July 1, 2026⁹. Building permit fees are based on the structure's square footage and total project valuation, and the county quotes the fee after plan check¹⁰. Property owners can build their own home through the county's Owner as Builder process, but that does not waive building, zoning, septic or inspection requirements⁵.

Grand County Building & Sanitation handles building permits, plan review, inspections and code compliance, and it is the authority for unincorporated Grand County and for the town limits of Grand Lake, Hot Sulphur Springs and Kremmling¹¹. Call 970-725-3255 or visit 308 Byers Avenue in Hot Sulphur Springs for help with the correct application path¹¹. All building applications are submitted online, and Planning & Zoning performs a pre-check before an application advances¹. Planning questions go to the Grand County Planning & Zoning Division at planning@co.grand.co.us². Incorporated towns outside that list may run their own building rules, so for a parcel inside any other town, ask the town before filing with the county². Septic permits for unincorporated land still come from the county Building & Sanitation Division, not from a town¹.

Yes. The Grand County Planning & Zoning Division manages land use and development in unincorporated Grand County². The county has many zoning districts, and Planning & Zoning needs an accurate legal description to verify a parcel's designation¹². For most properties the published setbacks are 30 feet in front, 10 feet at the sides and 20 feet at the rear, with a 30-foot setback from a water body or waterway, but they vary by district¹². Every dwelling unit must contain at least 400 square feet of floor area, measured on the outside walls⁶. Maximum building height is 35 feet above finish grade, or 40 feet where the finished grade changes by five feet or more within the footprint⁶. Minimum lot size depends on the district; the county's mobile home district, for example, sets 2 acres for un-subdivided land and larger areas where percolation tests show the soil cannot handle the septic system³. Send the parcel's legal description and proposed use to Planning & Zoning before relying on a listing's buildability claims².

Grand County Building & Sanitation serves as the county sanitarian and issues septic (onsite wastewater treatment system) permits for unincorporated Grand County^1,11. Applications go in through the county's online Cloudpermit portal and need an engineered, stamped design from a Colorado registered professional engineer¹³. The county also requires a notarized Declaration of Covenants, with a $43 recording fee paid to the County Clerk¹³. The permit fee is $850 for a new system or complete replacement and $400 for repairs¹³. Colorado requires an OWTS permit before a system is constructed, altered or installed, and a final inspection and local approval before it is placed in use¹⁴. Only 3.4% of mapped county soils rate as free of severe limits for a conventional drain field, so make septic feasibility and the engineered design an early purchase contingency¹⁵.

Living in an RV on private land in unincorporated Grand County is not allowed as a home. Private camping is permitted only on property of 35 acres or more, never in Residential or Estate zoned districts, for no more than 14 days in any consecutive three-month period, and may not be used as a dwelling, residence or home³. One narrow exception exists for owner-builders: with an approved building permit, one self-contained recreational camping vehicle may be used during construction of an owner-built single-family dwelling for one continuous year starting at the footing inspection, with no extensions³. Mobile tiny homes fall under the same rules as RVs and campers, while a 400 square foot home on a foundation is allowed in a zoned district that allows single-family dwellings⁴. Colorado also allows state-certified tiny homes for long-term living, but plans need state approval before construction and the unit remains subject to local zoning and site criteria¹⁶. Colorado's state-park camping rules do not answer the private-land question¹⁷.

1. Ask Planning & Zoning to verify the parcel's zoning designation, permitted use and setbacks from its legal description¹².

1. Resolve access early; Road & Bridge says a county-road driveway or access permit comes before the building application¹⁸. Direct access to a state highway requires a Colorado Department of Transportation access permit¹⁹.

1. Arrange an engineered OWTS design and apply through Cloudpermit for the county septic permit if public sewer is unavailable^13,14.

1. Apply to the Colorado Division of Water Resources if the project needs a groundwater well⁷.

1. Submit the building application online and complete the Planning & Zoning pre-check¹.

1. If you want to live on site while you build as an owner-builder, confirm the one-year RV allowance once the building permit is approved³.

1. Complete required building and septic inspections before occupancy^8,14.

Confirm zoning, setbacks, legal access, water and wastewater feasibility before treating a Grand County parcel as buildable^1,7,12. Septic deserves special attention because only 3.4% of mapped soils rate as free of severe limits for a conventional drain field¹⁵. Terrain can also narrow the practical building envelope: only 26.6% of county land is at a 15% slope or less, 53.9% is wooded and 69% is federal land¹⁵. Ask the county Floodplain Administrator whether the site needs a floodplain development permit²⁰. If access is directly from a state highway, budget for the separate state access-permit process¹⁹.