Above-ground pools in unincorporated Solano County need a building permit if 24 inches or deeper or holding over 5,000 gallons, per California Building Code Section 105.2 as adopted under County Code Chapter 6.3. Regardless of permit status, any pool holding water more than 18 inches deep must meet the state barrier rules.
Under California Building Code Section 105.2, adopted by Solano County through County Code Chapter 6.3, a prefabricated above-ground pool accessory to a single-family (Group R-3) home is exempt from a building permit only if it is less than 24 inches deep, holds no more than 5,000 gallons, and is installed entirely above ground. Above that threshold, a building permit from Resource Management Building & Safety Services is required. Permit status does not change the safety obligation: any structure holding water more than 18 inches deep is a 'swimming pool' under Health & Safety Code Section 115921 and is subject to the Swimming Pool Safety Act barrier and safety-feature rules. For an above-ground pool with walls at least 48 inches high, the pool wall can serve as the barrier provided the ladder is removable or can be secured when the pool is not in use, and any attached deck or steps are gated - consistent with the 2022 California Residential Code Appendix AX and Health & Safety Code 115923.
Installing an above-ground pool over the 24-inch/5,000-gallon threshold without a permit is a stop-work item subject to corrective-permit fees under the adopted California Building Code. Leaving an access ladder in place on a barrier-by-wall pool when unattended can be pursued as a code-compliance issue because it defeats the required barrier. The pool cannot be finaled until it passes barrier inspection.
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