Skip to main content
PermitBase

Roofing Permit (Reroof) in Thornton, Colorado

Required for roof replacement in Thornton when more than one square (100 sq ft) of roof covering is replaced. Replacement of one square or less is treated as a repair and does not require a permit. Governed by Thornton's Roofing Standards handout and the 2024 IRC/IBC.

Verified 2026-06-30 · Source

When you need this permit

  • A permit is required when more than one square (100 sq. ft.) of roof covering is replaced; one square or less is a repair, no permit required
  • Each slope containing damaged shingles must be replaced in its entirety — partial replacement of asphalt roofing on a single slope is not allowed
  • Ice and water shield is required only if specified in the shingle manufacturer's installation instructions (not required jurisdiction-wide)
  • Drip edge flashing required at eaves and rakes, extending over the plywood sheathing at the fascia
  • Multi-unit buildings (apartments, condos, duplexes, townhomes) sharing a single address apply on one application and receive one permit; individually addressed units apply on one application listing each address
  • Applications submitted via the CityView Portal

Required documents

Check off what you have — your progress is saved on this device.

Not ready yet — 0 of 1 required documents checked.

This checker covers one permit. A full project usually triggers several — our checklist will assemble all of them, free →

Fee schedule

Roofing Permit Fee — treated as 'Other Permit Fee' (trade valuation $0 to $1,000)City of Thornton 2026 Building Permit Fee Schedule lists Roofing under 'Other Permit Fees including Mechanical, Electrical, Plumbing, Roofing, Siding, and Fences' using the same $30 (first $1,000) + $10/$1,000 valuation-based formula
$30.00
Roofing Permit Fee — trade valuation $1,001 and up
$30.00 for the first $1,000 plus $10.00 for each additional $1,000 or fraction thereof

Review timeline

Plan reviewTypical estimate — confirm current times with the Thornton building department
~0–1 business days

How long did your Roofing Permit (Reroof) permit actually take in Thornton?

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

Inspection process

  1. 1

    Sheathing Inspection

    All roof sheathing installations inspected prior to covering

  2. 2

    Mid-Roof Inspection

    Photo submittal via text: old roof covering removed, drip edge/valley flashing installed, 75-100% felt underlayment, 40-75% shingles installed

  3. 3

    Final Inspection

    Done virtually (FaceTime/Google Meet); shingles self-sealed, all flashing complete

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

Tips

  • Thornton's mid-roof inspection is done by texting photos, and the final roof inspection is done virtually via FaceTime or Google Meet — schedule through the CityView Portal; the permit must be issued first.
  • If scheduled before 3:30 p.m., you can request the inspection for the next business day; an inspector confirms by text/call between 8-9 a.m.
  • The Building Inspection Division does not inspect the dryer duct or gas vent connection below the roofline at final inspection — the City recommends having a licensed plumbing/mechanical contractor verify these were not dislodged during the reroof.

Frequently asked questions

Yes, if more than one square (100 sq. ft.) of roof covering is being replaced. Replacing one square or less is considered a repair and does not require a permit.

In Thornton, the published Roofing Permit Fee — treated as 'Other Permit Fee' (trade valuation $0 to $1,000) is: $30.00. Additional published fees: Roofing Permit Fee — trade valuation $1,001 and up — $30.00 for the first $1,000 plus $10.00 for each additional $1,000 or fraction thereof. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Plan review for a roofing permit (reroof) in Thornton typically runs 0–1 business days. This is an estimate, not a published figure — confirm current review times with City of Thornton — City Development, Building Inspection Division at 303-538-7250.

You'll need: Roofing Permit Application (CityView Portal). Depending on your project, Thornton may also ask for: Roofing Standards handout. See the required-documents checklist on this page for details on each.

Mid-roof inspections are completed by texting photos to the inspector; final roof inspections are conducted virtually via FaceTime or Google Meet. Both are scheduled through the CityView Portal.

Apply through City of Thornton — City Development, Building Inspection Division at 9500 Civic Center Drive, Thornton, CO 80229. Phone: 303-538-7250, email: buildings@thorntonco.gov. Office hours: Mon–Fri, 8:00 a.m.–5:00 p.m. (counter payments 8:00 a.m.–4:30 p.m.). Official information: https://www.thorntonco.gov/business-development/city-development/building-permits-inspections.

Thornton, Colorado has adopted: 2024 International Building Code (IBC) — with Thornton amendments; adopted by ordinance May 13, 2025, effective July 1, 2025 (replaced the 2021 IBC); 2024 International Residential Code (IRC) — with Thornton amendments (Table R301.2 climatic/geographic design criteria repealed and reenacted with Thornton-specific values); effective July 1, 2025; 2024 International Plumbing Code (IPC) — with Thornton amendments; effective July 1, 2025; 2024 International Mechanical Code (IMC) — with Thornton amendments; effective July 1, 2025; 2024 International Fuel Gas Code (IFGC) — with Thornton amendments; effective July 1, 2025; 2024 International Energy Conservation Code (IECC) — adopted in full (residential provisions); includes Colorado Model Electric Ready and Solar Ready Code per HB22-1362; effective July 1, 2025; 2024 International Existing Building Code (IEBC) — with Thornton amendments; effective July 1, 2025; 2024 International Swimming Pool and Spa Code (ISPSC) — adopted by reference; effective July 1, 2025; 2023 National Electrical Code (NEC) / NFPA 70 — Thornton adopts the NEC edition currently adopted by the State of Colorado automatically and simultaneously (Thornton City Code Sec. 10-162); matches the statewide electrical code; 2021 editions of the above I-Codes and the 2017 NEC — the prior code cycle, superseded for new submittals as of July 1, 2025 but referenced for projects permitted under it (e.g., the city's 2023-dated Solar PV submittal-requirements handout still cites 2020 NEC/2021 IRC/2021 IBC/2021 IFC and should be read as superseded by the current 2024/2023 code cycle for design-code citations). Local amendments apply — see the Thornton 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 Thornton building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

Other permits in Thornton

Residential Building Permit (New Construction)Residential Addition / Remodel PermitElectrical PermitPlumbing PermitMechanical / HVAC PermitSolar PV PermitElectric Vehicle (EV) Charging Station PermitAccessory Dwelling Unit (ADU) PermitDemolition PermitCommercial Tenant Improvement PermitDeck / Covered Patio PermitSign PermitFire Sprinkler / Fire Alarm System PermitChange of Use (Business Change of Certificate of Occupancy)

Roofing Permit (Reroof) in other cities

Alamosa, ColoradoArvada, ColoradoAspen, ColoradoAurora, ColoradoAvon, ColoradoBasalt, ColoradoBlue River, ColoradoBoulder, Colorado

Compare roofing permit (reroof) fees across Colorado →

Look up this fee in a different city →

Embed this data card →

Related guides

Roof Replacement

Now live

Build your Thornton project checklist

Describe your project once and get every permit, document, and fee it triggers in Thornton — in one checklist. Sign up and pay once to generate it, or go unlimited with Pro.

Get started →