Westminster Building Codes, ADU & Permit Guide

Housing and Building Standards Colorado 3 Minutes Read · published March 01, 2026 Flag of Colorado

Westminster, Colorado homeowners and builders must follow local building codes, accessory dwelling unit (ADU) rules, permit processes and energy requirements enforced by the City of Westminster Community Development departments. This guide summarizes where to check rules, how to apply for permits, typical enforcement paths, and practical steps to comply. It references the City Building Division permit guidance and the Westminster municipal code for authoritative requirements and appeals. Where specific fee amounts or penalty figures are not posted on the official pages, the text notes that those numbers are "not specified on the cited page" and points to the department contact for confirmation. Read the Applications & Forms section before starting plans.

Permitting basics

Most construction, structural changes, electrical, plumbing, mechanical work and new ADUs require a building permit and plan review with the City Building Division. Confirm zoning and ADU permissibility with Planning before preparing construction documents. See the Building Division permit guidance for submission requirements[1] and consult the municipal code for adopted technical codes and local amendments[2].

  • Determine whether your project is an ADU or a primary dwelling alteration.
  • Check zoning, setbacks and lot coverage with Planning before design.
  • Prepare plans to the city and state adopted codes and energy standards.
  • Review the permit fee schedule and pay required fees at submission.
Confirm ADU allowance with the Planning Division before investing in final plans.

Penalties & Enforcement

Enforcement is handled by the Community Development departments: Building Division for code and inspection matters, and Code Enforcement/Planning for zoning and occupancy issues. The municipal code and Building Division pages outline enforcement authority; where exact fine amounts or escalation schedules are not shown on the city pages this guide notes "not specified on the cited page." For case-specific fines, orders, or stop-work directives contact the Building Division or Code Enforcement directly.[1][2]

  • Monetary fines: not specified on the cited page.
  • Escalation: first, repeat and continuing offences escalation ranges not specified on the cited page.
  • Non-monetary sanctions: stop-work orders, compliance orders, revocation of permits, and referral to municipal court may be used; specific procedures are in the municipal code.[2]
  • Enforcer: Building Official, Code Enforcement officers, and Community Development managers perform inspections and issue orders.
  • Inspection and complaint: use the Building Division contact and Code Enforcement complaint form on the city site to report unsafe or unpermitted work.[1]
  • Appeals/review: appeals routes are referenced in the municipal code; time limits for appeals are not specified on the cited page.
  • Defences/discretion: permits, variances, reasonable excuse or corrective compliance plans are typical defenses where allowed; check the municipal code or contact the Building Division.

Applications & Forms

The City publishes a Building Permit Application and instructions via the Building Division permit pages; fee schedules and submittal methods (online portal or in-person) are available from the Building Division. Specific form names, numbers and fee tables are available on the Building Division permit page or by contacting the department; some fee figures are not specified on the cited page.[1]

How-To

  1. Verify ADU allowance and zoning with the Westminster Planning Division.
  2. Prepare code-compliant plans addressing structural, mechanical, plumbing, electrical and energy compliance.
  3. Submit a complete Building Permit Application with required documents and pay fees per the Building Division instructions[1].
  4. Schedule required inspections during construction and correct any deficiencies noted by inspectors.
  5. Obtain final inspection and Certificate of Occupancy before renting or occupying an ADU.
Do not occupy an ADU or rent it before final inspection and certificate of occupancy.

FAQ

Do I need a building permit for an ADU?
Yes. ADUs typically require a building permit, plan review and inspections through the City Building Division; verify zoning first with Planning.[1]
What energy codes apply to new construction or ADUs?
Westminster adopts state and model energy codes and local amendments referenced in the municipal code; specific local amendments are listed in the municipal code pages.[2]
How long does permit review take?
Review times vary by project scope and workload; specific review timeframes are not specified on the cited page—contact the Building Division for current estimates.[1]

Key Takeaways

  • Check zoning and ADU permissibility first with Planning.
  • Submit complete permit documents to the Building Division to avoid delays.
  • Do not occupy an ADU before final inspection and certificate of occupancy.

Help and Support / Resources

  1. [1] City of Westminster - Building Division permits and inspections
  2. [2] Westminster Municipal Code via Municode

Categories

General Governance and Administration Public Safety Public Health and Welfare Land Use and Zoning Housing and Building Standards Transportation Environmental Protection Parks and Public Spaces Business and Consumer Protection Taxation and Finance Labor and Employment Education Civil Rights and Equity Elections and Campaign Finance Events and Special Uses Signs and Advertising Utilities and Infrastructure Technology and Data