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Residential Addition / Remodel Permit in Westminster, Colorado

Required for room additions, basement finishes, remodels, and structural alterations to existing one- and two-family dwellings in Westminster. Uses the same valuation-based fee schedule as new residential construction.

Verified 2026-06-30 · Source

When you need this permit

  • Room additions, attached/detached garages, and accessory buildings larger than 120 sq ft require a permit
  • Basement finishes and remodels involving modifications to electrical, plumbing, mechanical, and/or structural systems require a permit
  • Installation of additional windows or doors, or a change in window/door size, requires a permit
  • Electric-to-gas conversions require a permit
  • Plans must show scope, dimensions, structural details, and connection to the existing structure
  • Structural work must meet the City's Design Criteria for Structures (30 psf snow, Seismic Design Category B, City Map Wind Zone speed)

Required documents

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Fee schedule

Building Permit Fee — valuation-based (same tiers as new construction)City of Westminster Building Division Fee Schedule, effective January 1, 2026
Varies by valuation — see Residential Building Permit fee tiers ($19.50 minimum, up to $4,659.20 + $2.65/$1,000 over $1M)
Plan Review Fee
65% of the Building Permit Fee
Permit Trade Fees (mechanical, plumbing, electric)
An additional 15% of the Building Permit Fee, plus 15% of the Plan Review Fee, for each trade involved
Estimated Use Tax
4.25% of 50% of Total Valuation

Review timeline

Plan reviewTypical estimate — confirm current times with the Westminster building department
~1–1 business days

How long did your Residential Addition / Remodel Permit permit actually take in Westminster?

Anonymous — one question, no email. Answers are combined and only shown once at least 5 people have reported.

Inspection process

  1. 1

    Foundation (if new footings)

    Before concrete pour — 36-inch frost depth minimum

  2. 2

    Framing

    After framing complete, before insulation or wall cover

  3. 3

    MEP Rough-In

    Electrical, plumbing, mechanical rough-in before walls closed

  4. 4

    Final

    All work complete per approved plans

See the full Westminster inspection guide — scheduling & re-inspection fees →

Tips

  • Additions and remodels use the same valuation-based fee table (and 65% plan review rate) as new residential construction — there is no separate flat-rate schedule.
  • Structural additions must meet Westminster's Design Criteria for Structures (30 psf snow, Seismic Design Category B, City Map Wind Zone-based wind speed) — confirm your parcel's wind zone (1, 2, or 3) before finalizing structural plans.
  • Replacing plumbing/light fixtures in place does NOT require a permit, but relocating them does.

Frequently asked questions

Yes, if the basement finish involves framing, electrical, plumbing, or mechanical work. A building permit is required and reviewed against the 2021 IRC with Westminster amendments.

In Westminster, the published Building Permit Fee — valuation-based (same tiers as new construction) is: Varies by valuation — see Residential Building Permit fee tiers ($19.50 minimum, up to $4,659.20 + $2.65/$1,000 over $1M). Additional published fees: Plan Review Fee — 65% of the Building Permit Fee; Permit Trade Fees (mechanical, plumbing, electric) — An additional 15% of the Building Permit Fee, plus 15% of the Plan Review Fee, for each trade involved; Estimated Use Tax — 4.25% of 50% of Total Valuation. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Plan review for a residential addition / remodel permit in Westminster typically runs 1–1 business days. This is an estimate, not a published figure — confirm current review times with City of Westminster — Department of Community Development, Building Division at 303-658-2075.

You'll need: Building Permit Application (eTRAKiT); Site Plan; Construction Drawings; Residential Additions Plan Submittal Requirements. See the required-documents checklist on this page for details on each.

Westminster requires 4 inspection(s) for a residential addition / remodel permit, in order: Foundation (if new footings), Framing, MEP Rough-In, Final. Schedule each through City of Westminster — Department of Community Development, Building Division (303-658-2075).

Apply through City of Westminster — Department of Community Development, Building Division at 4800 W. 92nd Avenue, Westminster, CO 80031. Phone: 303-658-2075, email: permits@westminsterco.gov. Office hours: Mon–Fri, 8 a.m.–5 p.m. (front office); residential permit review walk-through times: Tuesdays 1–4:30 p.m. and Thursdays 9 a.m.–noon; all permits must be applied for online via eTRAKiT. Official information: https://www.westminsterco.gov/621/Building-Division.

Westminster, Colorado has adopted: 2021 International Building Code (IBC) — with City of Westminster amendments; effective June 1, 2024; 2021 International Residential Code (IRC) — with City of Westminster amendments; effective June 1, 2024; 2021 International Fire Code (IFC) — with City of Westminster amendments; effective June 1, 2024; 2021 International Plumbing Code (IPC) — with City of Westminster amendments; effective June 1, 2024; 2021 International Mechanical Code (IMC) — with City of Westminster amendments; effective June 1, 2024; 2021 International Fuel Gas Code (IFGC) — with City of Westminster amendments; effective June 1, 2024; 2021 International Energy Conservation Code (IECC) — adopted per Westminster Municipal Code Section 11-9-11, meeting the Colorado HB22-1362 statewide minimum energy-code floor; Colorado Model Electric Ready and Solar Ready Code — adopted per Westminster Municipal Code Section 11-9-12, with Westminster amendments (waiver/variance provisions for commercial buildings over 10,000 sq ft and substantial cost differential appeals); 2023 National Electrical Code (NEC) / NFPA 70 — current edition (per Westminster's Commercial Plan Review Submittal Guidelines); the City has announced the 2026 NEC will become effective August 1, 2026, superseding the 2023 edition; ICC/ANSI A117.1-2017 — Standard for Accessible Design. Local amendments apply — see the Westminster overview page for the full list.

Sources & verification

Verified against official sources. Last reviewed 2026-06-30.

Fees, timelines, and adopted codes are researched from each jurisdiction's published records — see how we verify. Requirements change and vary by project, so always confirm the current details with the Westminster building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

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