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Commercial Tenant Improvement Permit in Longmont, Colorado

Required for interior remodels, additions, and tenant improvements in commercial buildings in Longmont. Reviewed against the 2021 IBC with Longmont amendments and climatic/geographic design criteria; uses the same valuation-based Primary Fee Schedule with a higher commercial plan review rate.

Verified 2026-06-30 · Source

When you need this permit

  • Building permit required for commercial remodel/tenant improvement work
  • Applications submitted via the ACA portal under 'Commercial/Industrial Remodel/Addition'
  • A combined Commercial Remodel/Tenant Improvement Construction Permit Application & Submittal Checklist is published by Building Services (revised January 2026) and must be followed for submittal completeness
  • Commercial plan review fee rate (65% of building permit fee) applies, higher than the 50% residential rate

Required documents

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Fee schedule

Building Permit Fee — valuation-based (Primary Fee Schedule)City of Longmont FY2026 Fee Manual — same table used for residential and commercial
Per the Primary Fee Schedule — $27.00 minimum, scaling to $6,448.55 + $4.20/$1,000 over $1,000,000
Plan Review Fee — commercialFY2026 Fee Manual, Plan Review Fees table
65% of the Building Permit Fee
Additional Plan Review (changes/revisions to plans)FY2026 Fee Manual
$47.00 minimum charge (one hour); $47.00/hour for incomplete/changed submittals

Review timeline

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

How long did your Commercial Tenant Improvement 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

    Framing / Structural

    After framing complete, before walls covered

  2. 2

    MEP Rough-In

    Mechanical, electrical, plumbing rough-in before walls closed

  3. 3

    Final

    All work complete, ready for Certificate of Occupancy

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

Tips

  • Commercial plan review in Longmont is charged at 65% of the building permit fee, notably higher than the 50% residential rate — factor this into TI project budgets.
  • Use the January 2026-revised Combined Commercial Remodel/Tenant Improvement checklist to avoid incomplete-submittal plan review surcharges ($47/hour).

Frequently asked questions

Longmont requires a commercial tenant improvement permit for: Building permit required for commercial remodel/tenant improvement work; Applications submitted via the ACA portal under 'Commercial/Industrial Remodel/Addition'; A combined Commercial Remodel/Tenant Improvement Construction Permit Application & Submittal Checklist is published by Building Services (revised January 2026) and must be followed for submittal completeness; Commercial plan review fee rate (65% of building permit fee) applies, higher than the 50% residential rate. 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.

Commercial plan review is charged at 65% of the building permit fee, compared to 50% for residential plan review, per the City of Longmont FY2026 Fee Manual.

Plan review for a commercial tenant improvement 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: Commercial/Industrial Remodel/Addition Application (via ACA portal); Combined Commercial Remodel/Tenant Improvement Construction Permit Application & Submittal Checklist (Revised 1/13/2026); Full Construction Drawing Set. See the required-documents checklist on this page for details on each.

Longmont requires 3 inspection(s) for a commercial tenant improvement permit, in order: Framing / Structural, 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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Commercial Tenant Improvement Permit in other cities

Alamosa, ColoradoArvada, ColoradoAspen, ColoradoAurora, ColoradoBoulder, ColoradoBreckenridge, ColoradoBroomfield, ColoradoCalhan, Colorado

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