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Residential Addition / Remodel Permit in Longmont, Colorado

Required for additions, remodels, basement finishes, and structural alterations to existing residential buildings in Longmont. Uses the same valuation-based Primary Fee Schedule as new construction. Filed as a 'Residential Remodel/Addition' application via the ACA portal.

Verified 2026-06-30 · Source

When you need this permit

  • Building permit required for any addition or alteration to an existing building or structure
  • Covers basement finishes, room additions, garage conversions, re-siding, retaining walls over 48 inches, and similar alterations
  • Applications submitted via the Accela Citizen Access (ACA) portal, 'Residential Remodel/Addition' application type
  • Homeowner may self-permit as own contractor on their own property

Required documents

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Fee schedule

Building Permit Fee — valuation-based (same Primary Fee Schedule as new construction)City of Longmont FY2026 Fee Manual, Primary Fee Schedule — applies identically to additions/remodels based on project valuation
$27.00 minimum, scaling to $6,448.55 + $4.20/$1,000 over $1,000,000
Plan Review FeeFY2026 Fee Manual
50% of the Building Permit Fee
Additional Plan Review (changes/revisions to plans)FY2026 Fee Manual, Plan Review Fees table
$47.00 minimum charge (one hour)
Additional Plan Review (incomplete/changed submittal documents)
$47.00/hour

Review timeline

Plan reviewTypical estimate — confirm current times with the Longmont building department
~0–0 business days

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

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

  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 Longmont inspection guide — scheduling & re-inspection fees →

Tips

  • Longmont uses the same valuation-based Primary Fee Schedule for additions/remodels as for new construction — there is no separate flat-rate table for typical remodel scopes.
  • Retaining walls over 48 inches require a building permit in Longmont; shorter walls may not.
  • Basement finishes involving framing, electrical, or plumbing require a building permit with associated sub-trade permits.

Frequently asked questions

Yes. Basement finishing is listed explicitly as an example of an alteration requiring a building permit under the City of Longmont's Fee Manual. Any associated electrical, plumbing, or mechanical work requires the applicable sub-trade permits as well.

In Longmont, the published Building Permit Fee — valuation-based (same Primary Fee Schedule as new construction) is: $27.00 minimum, scaling to $6,448.55 + $4.20/$1,000 over $1,000,000. Additional published fees: Plan Review Fee — 50% of the Building Permit Fee; Additional Plan Review (changes/revisions to plans) — $47.00 minimum charge (one hour); Additional Plan Review (incomplete/changed submittal documents) — $47.00/hour. 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 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 Remodel/Addition Application (via ACA portal); Site Plan; Construction Drawings. See the required-documents checklist on this page for details on each.

Longmont 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 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/.

Longmont, Colorado has adopted: 2021 International Building Code (IBC) — adopted effective January 1, 2022; currently in force citywide; 2021 International Residential Code (IRC) — adopted effective January 1, 2022; currently in force citywide; 2021 International Energy Conservation Code (IECC) — adopted as part of the 2021 International Codes package effective January 1, 2022; 2021 International Fire Code (IFC) — adopted effective January 1, 2022; International Plumbing Code (IPC) and International Mechanical Code (IMC) / International Fuel Gas Code (IFGC) — adopted as part of the 2021 International Codes package effective January 1, 2022 (edition confirmed via Longmont's 2021 IBC/IRC Geographic Climatic Data Table; individual plumbing/mechanical/fuel-gas amendment ordinance text not independently re-verified beyond the city's codes-adoption page); 2023 National Electrical Code (NEC) — adopted with Longmont amendments, effective July 24, 2024; PENDING — NOT YET EFFECTIVE: 2024 International Codes plus the Colorado Energy Code Cohort's model amendments were scheduled for Longmont City Council consideration May 12, 2026, with an anticipated effective date of July 1, 2026. As of this extraction (lastVerified 2026-06-30), the City's own Building Code Update page still describes this as a pending/anticipated action, not a confirmed adopted-and-effective ordinance — DO NOT treat the 2024 codes as adopted until the city's codes page or Municode ordinance list confirms passage.. Local amendments apply — see the Longmont 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 Longmont building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

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