Westminster, CA Accessory Structures: Shed & Carport Rules (2026)
Shed permit rules in Westminster, CA, also referred to as storage shed, backyard shed, or accessory building regulations, set size limits, setbacks, and when a building permit is required.
Key Facts
- Governing section
- Westminster Municipal Code § 17.400.130
- Permit-exempt shed size
- 120 sq ft or less, 7 ft or less tall
- Non-garage accessory cap
- 200 sq ft combined, 1,000 sq ft open yard
- Setback, rear third of lot
- 3 ft side and rear setback
- Corner lot setback
- 10 ft street-side setback required
- Max height
- 15 ft to roof peak, 10 ft flat roof
- Separation from dwelling
- 6 ft minimum from main house
Summary
A backyard shed, playhouse, or similar accessory structure in Westminster is exempt from building-permit development standards only if it is 120 square feet or less and 7 feet or less in height, per Municipal Code Section 17.400.130. Anything larger triggers a full set of standards: a 200-square-foot cap on combined non-garage accessory buildings, a 15-foot roof peak height limit, and setbacks that depend on where the structure sits on the lot.
An accessory building or structure 120 square feet or less and 7 feet or less in height including children's play houses shall be exempt from development restrictions (except Building and Fire codes) provided it is placed behind a line extending from the exterior wall of the main dwelling unit nearest the streets but not closer than the minimum setback line and no part of the building or structure extends beyond any property line and that any portion of an accessory structure designed as a deck, platform, or walking or play area including the top portion of an elevated playhouse/treehouse or platform, swimming pool slide, must maintain a 15-foot side and rear setback. This restriction does not apply if the adjacent properties are not zoned for residential use.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4982734; v10 updated 2026-06-10).
Full Breakdown
2 imposes real limits. The combined area of non-garage detached accessory structures cannot exceed 200 square feet, and the rear yard must keep at least 1,000 square feet of contiguous open space. Setbacks depend on placement: a structure in the rear third of the lot needs only a 3-foot side and rear setback, but one built in the front two-thirds of the lot must meet the same side and rear setbacks required for the main house. Corner lots add a 10-foot street-side setback for any accessory structure.
Height is capped at 15 feet to the roof peak, dropping to a 10-foot plate line for flat or shed roofs, and to 10 feet total for structures with no roof at all, including play equipment. Eave overhangs cannot come within 2 feet of a side or rear property line, and every detached structure must keep a 6-foot separation from the dwelling unit itself. Decks, platforms, and elevated play structures such as treehouses or pool slides need a 15-foot side and rear setback regardless of size.
A shed, workshop, or garage-style structure must also match the architecture, materials, color palette, and roof pitch of the main house on the lot, and City officials may inspect any accessory structure on reasonable cause to believe it is out of compliance.
Violations & Fines
Accessory structures may never contain a kitchen, cooking facility, or bathroom fixtures beyond a single wet-bar sink or laundry sink, and no one may sleep or reside in one, temporarily or permanently, under Section 17.400.130.B.2.i and .j. A structure built over 120 square feet without meeting the setback, height, or separation standards is a zoning violation subject to code enforcement, and owners must allow City officials access to the property on reasonable cause to believe the structure or its use is noncompliant.
Frequently Asked Questions
Do I need a permit for a small backyard shed in Westminster?
How big can my shed be before extra rules kick in?
What setback does a larger shed need from my property line?
Can I live or cook in my backyard shed?
Sources & Official References
Other rules in Westminster
How Westminster compares: Shed Permit Requirements by City·California rules heatmap·Compare Westminster to another location·View the California accessory structures overview
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