Bolthole Index

Orange County, California

Building permits, zoning and land rules in Westminster, California

Westminster, California requires building permits for construction and alterations, subject to exceptions; the Westminster Building Division handles plan review, building-permit issuance and inspections.1 Westminster’s Planning Division administers city zoning.2 Orange County Environmental Health handles well enforcement in Westminster, but we could not confirm the septic-permit authority inside city limits; ask Environmental Health to identify the appropriate agency.3

At a glance

Building permits
Required for construction and alterations, with exceptions1
Zoning
City zoning administered by Westminster Planning Division2
R1 lot size
6,500 square feet for corner lots; 6,000 for other lots4
ADUs
Allowed subject to city standards and applicable state law5
Tiny homes
Classification, code compliance and an approved location required6
Owner-builder
Conditional contractor-license exemption; building permits still apply7
Wells
County well enforcement; permit required before construction or destruction3

Who to call

Building permits

Westminster Building Division

City building permits, plan review and inspections

(714) 548-3254

Planning & zoning

Westminster Planning Division

City zoning and land-use questions

(714) 548-3247

[email protected]

Building permits

Westminster Building Division — Plan Submittals

Construction-plan submittal instructions

Well permits

Orange County Environmental Health Well Permitting

County well enforcement, including Westminster; referral questions about the appropriate environmental-health agency

714-433-6287

[email protected]

Contact details are copied from each office’s official page and were checked against it on October 12, 2026.

Off-grid gear

Going off-grid in Westminster means bringing your own water and power. The kit we’d start with:

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Do you need a building permit in Westminster, CA?

Westminster requires an appropriate building permit before erecting, constructing, enlarging, altering, repairing, moving, improving, removing, converting or demolishing a building, structure or service equipment, with exceptions.1 For example, Westminster requires building permits for window and water-heater replacement, while certain appliance removal and reinstallation is exempt.1 Ask the Westminster Building Division to classify the proposed work before starting.1 California’s owner-builder exemption concerns contractor licensing and does not remove building-permit or inspection requirements.7

Who handles Westminster building permits and zoning?

The Westminster Building Division handles building-code compliance through plan review, building-permit issuance and inspections; reach the division at (714) 548-3254.1 Westminster’s Planning Division implements the city’s General Plan and Zoning Ordinance; reach Planning at (714) 548-3247 or [email protected].2 Start zoning and design questions with Planning, then use the Building Division’s construction-plan instructions after Planning approval.8 For property outside Westminster city limits, consult the Orange County guide for the county’s unincorporated-area building-permit requirements.9

Does Westminster have zoning, lot-size and height limits?

Westminster has city zoning administered by its Planning Division.2 In Westminster’s R1 Single-Family Residential District, the minimum lot size is 6,500 square feet for corner lots and 6,000 square feet for other lots.4 Westminster’s R1 maximum building height is 2 stories and 35 feet, subject to the code’s height exceptions.10 Ask Planning to identify the parcel’s district and applicable setbacks before designing a home; California reserves general setback requirements to local jurisdictions.211 Westminster prohibits short-term rental of residential dwelling units.12

How do septic permits and wells work inside Westminster?

California regulates new and replacement septic systems through local agencies under the statewide onsite-wastewater policy.13 We could not confirm which agency issues septic permits inside Westminster, or the city’s sewer-connection and off-grid sanitation rules; ask Westminster Planning about the parcel and Orange County Environmental Health for an agency referral.23 Orange County’s well page places well enforcement with the county Health Officer except in its named cities, which do not include Westminster.3 A well permit is required before well construction or destruction.3

Can you live in an RV or tiny home in Westminster?

We could not confirm Westminster’s complete residential RV-occupancy rule or a private-land camping allowance; ask the Westminster Planning Division about the proposed use and parcel.2 California generally limits residential RV occupancy to authorized parks unless a local ordinance allows otherwise.14 California requires a tiny home to fit an approved housing or vehicle classification, meet applicable standards and occupy an approved location.6 Westminster allows ADUs and junior ADUs subject to city standards and applicable state law; that does not establish approval for a tiny home on wheels.56

What are the steps for building a home in Westminster?

  1. Ask Westminster Planning to identify the zoning district and review the proposed use and design.2
  2. Obtain Planning approval on design and zoning, then prepare construction plans for Building Division review; plans must show the location, existing condition and proposed scope of work.8
  3. Resolve wastewater arrangements with Planning and obtain an Environmental Health referral if septic authority is unclear; obtain a county well permit before constructing a well.23
  4. Obtain the required building permit before work and coordinate inspections with the Building Division.1
  5. Ask Building about occupancy approval; Westminster temporary certificates of occupancy are valid for 30 days and require the City Council’s prescribed fee.15

Watch-outs

  • Westminster’s R1 lot-size and height standards are district-specific; ask Planning for the parcel’s applicable zoning standards.4102
  • An owner-builder contractor-license exemption does not exempt a Westminster project from building permits or inspections.7
  • We could not confirm Westminster’s minimum dwelling floor area, agricultural exemption or complete floodplain approval requirements; ask Planning and Building before committing to a design.21

Sources

  1. Westminster Building Division (westminster-ca.gov)
  2. Westminster Planning Division (westminster-ca.gov)
  3. Orange County Environmental Health Well Permitting (ochealthinfo.com)
  4. Chapter 17.210: Residential Zoning Districts (Westminster), quoted and re-checked
  5. Article 4: Standards for Specific Land Uses and Accessory Uses (Westminster), quoted and re-checked
  6. Information Bulletin 2016-01: Tiny Homes (California statewide rule), quoted and re-checked
  7. California Business and Professions Code Section 7044 (California statewide rule), quoted and re-checked
  8. Westminster Building Division — Plan Submittals (westminster-ca.gov)
  9. Building Permit Information (2026 county census)
  10. Chapter 17.210: Residential Zoning Districts (Westminster), quoted and re-checked
  11. California Health and Safety Code Section 17922 (California statewide rule), quoted and re-checked
  12. Chapter 17.200: Establishment of Zoning Districts and Adoption of Zoning Map (Westminster), quoted and re-checked
  13. 2023 OWTS Policy (California statewide rule), quoted and re-checked
  14. hcd.ca.gov (California statewide rule), quoted and re-checked
  15. ecode360.com (Westminster), quoted and re-checked

Written October 12, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.

Answers from the rulebook for Westminster

Westminster’s own rules

  • Certificate of occupancyLimited

    Temporary certificates of occupancy inside Westminster city limits.

    • Each temporary certificate is valid for 30 days.
    • The applicant must pay the fee set forth in the City Council Fee Resolution.

    temporary certificate validity: 30 days

    “Each Temporary Certificate is valid for 30 days. Each person applying for a Temporary Certificate shall pay a fee as set forth in the City Council Fee Resolution.”
  • Minimum lot sizeSpecified

    R1 Single-Family Residential District inside Westminster city limits.

    • Corner lots require 6,500 square feet.
    • All other R1 lots require 6,000 square feet.

    minimum lot size, corner lot: 6500 square feet · minimum lot size, all other lots: 6000 square feet (corner lots)

    “Minimum lot size | 6,500 SF for corner lots 6,000 SF for all other lots | 10,000 SF”
  • Building heightSpecified

    R1 Single-Family Residential District inside Westminster city limits.

    • The R1 maximum is two stories and 35 feet.
    • Height-limit exceptions are cross-referenced to § 17.300.025.

    maximum stories: 2 stories (height-limit exceptions under § 17.300.025) · maximum height: 35 feet (height-limit exceptions under § 17.300.025)

    “Maximum building height: 2 stories not to exceed 35 feet For height limit exceptions, see Section 17.300.025”
  • Accessory dwellingsAllowed (with conditions)

    Accessory dwelling units and junior accessory dwelling units inside Westminster city limits.

    • ADUs and JADUs must comply with the standards in § 17.400.135 and applicable California Government Code provisions.
    “Accessory dwelling units and junior accessory dwelling units (in conjunction with a single-family or multifamily residence) | P | P | P | P | P”
  • Short-term rentalsProhibited

    Short-term rental of residential dwelling units inside Westminster city limits.

    • The prohibition is stated in § 17.200.020(G) and cross-references Chapter 9.74 for the definition.
    “Short-Term Rentals Prohibited. As defined in Chapter 9.74 of the Westminster Municipal Code, the short-term rental of residential dwelling units are prohibited within the City.”

Still unanswered

We looked and could not find an official answer yet. Silence is not permission; ask Westminster or Orange County directly.

  • Owner-builder exemption — Owner-builder work inside Westminster city limits.
  • Inspections — Building inspections inside Westminster city limits.
  • Minimum dwelling size — Minimum dwelling size in Westminster residential zoning districts.
  • Lot coverage — Lot coverage in Westminster zoning districts.
  • Living in an RV — Residential occupancy of recreational vehicles on private land inside Westminster city limits.
10 more unanswered
  • Camping on your land
  • Tiny homes
  • Who permits septic
  • Septic permit
  • Septic inspection
  • Off-grid sanitation
  • Well permit
  • Mandatory utility hookup
  • Agricultural exemption
  • Building in a floodplain

Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.

Unanswered questions are usually a sign that Westminster publishes no rule on the point, not that none exists. Orange County’s page lists the county offices to call.

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