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Deck / Covered Patio Permit in Longmont, Colorado

Required for construction of decks, patios, sunrooms, pergolas, and similar structures in Longmont. Classified as an 'Addition' under the City's building permit requirements and reviewed against the 2021 IRC and Longmont's climatic/geographic design criteria (30 psf snow load, 30-inch frost depth for footings).

Verified 2026-07-01 · Source

When you need this permit

  • Building permit required for patios, sunrooms, decks, pergolas, swimming pools, and accessory buildings greater than 120 sq ft in area
  • Accessory buildings 120 sq ft or less still must meet setback requirements even without a building permit
  • Retaining walls over 48 inches require a building permit
  • Homeowner may self-permit as own contractor on their own property

Required documents

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Fee schedule

Building Permit Fee — valuation-based (Primary Fee Schedule)City of Longmont FY2026 Planning & Development Services Fee Manual (effective 3/24/2026), Building Permit Fees Overview + Primary Fee Schedule (PDF p.6): decks, patios, sunrooms, and pergolas are classified as 'Additions' and are not among the itemized flat-fee 'Other Permits' line items, so they are billed via the published, valuation-based Primary Fee Schedule — the same grounded table used for new construction and residential additions/remodels
Assessed on project valuation (gross floor area/scope of work × ICC Building Valuation Data or RS Means Building Construction Cost Data) applied to the Primary Fee Schedule's Building Permit Fee table: $27.00 minimum (valuation $1-$500), scaling up to $6,448.55 for the first $1,000,000 plus $4.20 per additional $1,000
Plan Review FeeFY2026 Fee Manual, Plan Review Fees table
50% of the Building Permit Fee

Review timeline

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

How long did your Deck / Covered Patio 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

    Footing

    Before concrete pour for structural post footings — must extend below 30-inch frost line

  2. 2

    Framing

    Structural framing before decking/cover installed

  3. 3

    Final

    Structure complete per approved plans

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

Tips

  • Unlike Reno and Denver, Longmont does not publish a separate flat-rate fee for decks/patios — instead they are billed via the city's published, valuation-based Primary Fee Schedule (the same grounded table used for other additions), plus 50% plan review.
  • Deck footings in Longmont must extend below the 30-inch frost depth specified in the city's Geographic & Climatic Design Criteria table.
  • Accessory buildings of 120 sq ft or less are exempt from the building permit requirement itself but still must meet zoning setback requirements — check with Planning if in doubt.

Frequently asked questions

Yes. Decks are explicitly listed as an example of an 'Addition' requiring a building permit under the City of Longmont Fee Manual's Work That Requires a Building Permit section.

In Longmont, the published Building Permit Fee — valuation-based (Primary Fee Schedule) is: Assessed on project valuation (gross floor area/scope of work × ICC Building Valuation Data or RS Means Building Construction Cost Data) applied to the Primary Fee Schedule's Building Permit Fee table: $27.00 minimum (valuation $1-$500), scaling up to $6,448.55 for the first $1,000,000 plus $4.20 per additional $1,000. Additional published fees: Plan Review Fee — 50% of the Building Permit Fee. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Plan review for a deck / covered patio 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: Miscellaneous / Residential Remodel-Addition Application (via ACA portal); Site Plan. Depending on your project, Longmont may also ask for: Accessory Building Guide. See the required-documents checklist on this page for details on each.

Longmont requires 3 inspection(s) for a deck / covered patio permit, in order: Footing, Framing, 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 2026-07-01.

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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