Swimming pool permit rules in Douglas County, CO — also covering above-ground pools, in-ground pools, and spa installations — set fencing, barrier, alarm, and inspection requirements.
In unincorporated Douglas County (including Highlands Ranch and Roxborough), installing an in-ground or above-ground pool, spa, or hot tub requires a building permit from the Douglas County Building Division, which enforces the adopted 2021 International Residential Code.
The Douglas County Building Division reviews and permits residential pools, spas, and hot tubs on unincorporated land under the county's adopted 2021 IRC and 2020 National Electrical Code. Electrical work (bonding, GFCI protection) is permitted and inspected alongside the structure. Public and semi-public pools (HOA, apartment, and metro-district pools common in Highlands Ranch) must additionally be designed and operated under Colorado's state health regulation 5 CCR 1003-5, administered by CDPHE. Inside the home-rule towns of Castle Rock, Parker, and Lone Tree, that town's building department issues the permit instead of the county.
Installing a pool, spa, or hot tub without the required building and electrical permits is a code violation subject to stop-work orders, double permit fees, and enforcement under the county building code.
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