Residential Building Permit (New Construction) in Longmont, Colorado

Longmont requires a residential building permit (new construction) for: Building permit required for all new construction; Plans must comply with the 2021 IRC and Longmont's Geographic & Climatic Design Criteria (30 psf snow load, 110 mph nominal / 142 mph ultimate wind, Seismic Design Category B, 30-inch frost depth); Homeowner may act as own general contractor on their own property without a Longmont contractor's license; subcontracted trades must be licensed to work in Longmont; Applications submitted online via the Accela Citizen Access (ACA) portal (aca.longmontcolorado.gov); Approved plans must be kept on-site during construction; Sales/use tax due at permit issuance: 50% of project valuation × current city+county tax rate (4.865% combined, per FY2026 Fee Manual). If your project isn't listed, confirm with City of Longmont — Building Services (Building Inspection Division), Development Services Center at (303) 651-8332 before starting work.

In Longmont, the published Building Permit Fee — valuation $1 to $500 is: $27.00. Additional published fees: Building Permit Fee — valuation $501 to $2,000 — $27.00 for the first $500, plus $3.50 for each additional $100 or fraction thereof; Building Permit Fee — valuation $2,001 to $25,000 — $79.50 for the first $2,000, plus $16.10 for each additional $1,000 or fraction thereof; Building Permit Fee — valuation $25,001 to $50,000 — $449.80 for the first $25,000, plus $11.61 for each additional $1,000 or fraction thereof; Building Permit Fee — valuation $50,001 to $100,000 — $740.05 for the first $50,000, plus $8.05 for each additional $1,000 or fraction thereof; Building Permit Fee — valuation $100,001 to $500,000 — $1,142.55 for the first $100,000, plus $6.44 for each additional $1,000 or fraction thereof; Building Permit Fee — valuation $500,001 to $1,000,000 — $3,718.55 for the first $500,000, plus $5.46 for each additional $1,000 or fraction thereof; Building Permit Fee — valuation $1,000,001 and up — $6,448.55 for the first $1,000,000, plus $4.20 for each additional $1,000 or fraction thereof; Plan Review Fee — residential — 50% of the Building Permit Fee; Valuation Basis — Gross floor area (sq ft) or scope of work × ICC 'Building Valuation Data' or RS Means 'Building Construction Cost Data', reviewed/adopted annually by City Council; Sales/Use Tax — 50% of project valuation × 4.865% (combined current city and county rate); Impact Fees (Transportation, Recreation Buildings, Parks Improvement, Storm Drainage) — Vary by unit size — e.g., Transportation Fee residential 800 sq ft or less = $1,286.75, up to 4,000+ sq ft = $2,782.18; Parks Improvement Fee per single-family detached unit = $7,418.75; Storm Drainage Fee residential single-family per permit = $1,693.53. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Plan review for a residential building permit (new construction) in Longmont typically runs 0–0 business days. This is an estimate, not a published figure — confirm current review times with City of Longmont — Building Services (Building Inspection Division), Development Services Center at (303) 651-8332.

You'll need: Residential New Construction Application (via ACA portal); Site Plan / Survey; Construction Drawings; Energy Compliance Documents. See the required-documents checklist on this page for details on each.

Longmont requires 5 inspection(s) for a residential building permit (new construction), in order: Foundation / Footings, Framing, MEP Rough-In, Insulation / Energy, Final. Schedule each through City of Longmont — Building Services (Building Inspection Division), Development Services Center ((303) 651-8332).

Apply through City of Longmont — Building Services (Building Inspection Division), Development Services Center at 385 Kimbark St., Longmont, CO 80501. Phone: (303) 651-8332, email: building.inspection@longmontcolorado.gov. Office hours: Mon–Fri, 8 a.m.–5 p.m. (closed Federal holidays, Veterans Day, and the day after Thanksgiving; Building Inspection closed 10–11 a.m. on the 2nd and 4th Thursday for staff training). Official information: https://longmontcolorado.gov/building-inspection/permits/.

As of this extraction (2026-06-30), Longmont's currently adopted and effective code is the 2021 International Building Code and International Residential Code (effective January 1, 2022). Adoption of the 2024 International Codes was scheduled for City Council consideration on May 12, 2026, with an anticipated effective date of July 1, 2026 — confirm with Building Services (303-651-8332) whether that adoption has since been finalized.

Yes. A homeowner can act as their own contractor and do the work without a Longmont contractor's license on their own property. If any portion of the work is subcontracted (e.g., electrical wiring), that subcontractor must be licensed to work in Longmont, and the homeowner remains responsible for inspections and sign-offs.