Boulder, CO Swimming Pools & Spas: Pool Permits (2026)
Swimming pool permit rules in Boulder, CO, also covering above-ground pools, in-ground pools, and spa installations, set fencing, barrier, alarm, and inspection requirements.
Key Facts
- Permit required
- Yes, for most residential pools
- Exempt pools
- Prefab, under 24 in deep, ≤5,000 gal, above ground
- Governing code
- 2024 IBC as adopted, Sec. 10-5-2
- Setback rule
- Accessory structure setback applies (9-7-2(f))
- Max fine
- $2,650 per violation (Sec. 5-2-4)
Summary
Boulder requires a building permit for most residential swimming pools under the City's adopted building code. Only small prefabricated above-ground pools are exempt: under Section 10-5-2, B.R.C. 1981, a pool skips the permit only if it is less than 24 inches deep, holds no more than 5,000 gallons, and sits entirely above ground.
105.2 Work exempt from permit. Exemptions from the building permit requirements of this code do not grant authorization for any work to be done in violation of the requirements of this code or any other laws or ordinances of the city. Building permits shall not be required for the following: General: 1.One-story detached nonconditioned buildings accessory to a residential structure and not more than 120 square feet in area or ten feet in height and not being served by any electrical, mechanical, or plumbing fixtures or systems. ... 7.Prefabricated swimming pools accessory to a Group R-3 occupancy which are less than 24 inches deep, do not exceed 5,000 gallons, and are installed entirely above ground.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Municipal Code: Supplement 167 Update 3).
Full Breakdown
C. 1981. 2, 'Work exempt from permit,' which lists a narrow set of projects that do not need a building permit. Swimming pools appear on that list only in one specific form: a prefabricated pool accessory to a single-family (Group R-3) home that is less than 24 inches deep, holds no more than 5,000 gallons, and is installed entirely above ground. Any pool that is dug into the ground, deeper than 24 inches, larger than 5,000 gallons, or not prefabricated falls outside that narrow exemption and requires a building permit from the city before construction begins, along with the standard plan review, inspections, and fees that apply to other structural building permits in Boulder.
Once a permit is required, the pool must also meet the city's placement rules. C. 1981, 'Swimming Pools, Spas, and Hot Tubs,' the pool, spa, or hot tub has to sit within the applicable accessory structure setbacks for the lot, though the code carves out one exception: the pool, spa, or hot tub may instead be placed in compliance with the required front yard principal building setback if that is more workable for the site. Homeowners planning an in-ground pool, a large above-ground pool, or any pool tied into plumbing or electrical service should expect to submit for a building permit and confirm the accessory setback before digging.
Violations & Fines
Building without the required permit is enforced as a building code violation under Chapter 10-5, B.R.C. 1981, and is subject to Boulder's general penalty in Section 5-2-4, B.R.C. 1981: a fine of up to $2,650 per violation, up to ninety days in jail, or both. Under Section 5-2-5(b), each day the unpermitted pool remains is treated as a separate violation, so delays in obtaining an after-the-fact permit compound quickly.
Frequently Asked Questions
Do I need a permit for an in-ground pool in Boulder?
Is my small above-ground pool exempt from a permit?
Where can I place a permitted pool on my lot?
Sources & Official References
Other rules in Boulder
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Pool Permits in Nearby Cities
How other cities in Boulder County handle pool permits.