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Thornton building inspections

Verified

Inspection sequence, scheduling, and re-inspection fees for building permits in Thornton, Colorado.

Verified 2026-06-30 · Source

How to schedule

Inspections are requested through the building department below.

Address
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.)
Website
Official site

Published scheduling rules

  • 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. (Roofing Permit (Reroof))

Inspection sequence

Applies to: Residential Building Permit (New Construction)

  1. 1

    Foundation / Footings

    Before concrete pour; footings must extend below the 36-inch amended frost line and not less than 12 inches below undisturbed ground

  2. 2

    Framing

    After framing complete, before insulation or wall cover

  3. 3

    MEP Rough-In

    Mechanical, electrical, and plumbing rough-in before walls closed

  4. 4

    Insulation / Energy

    Insulation and 2024 IECC compliance verification before drywall

  5. 5

    Final

    All work complete, ready for Certificate of Occupancy

Applies to: Accessory Dwelling Unit (ADU) Permit

  1. 1

    Foundation

    Footings and foundation before concrete pour, below the 36-inch amended frost line

  2. 2

    Framing

    Structural framing, egress windows, fire separation (if attached)

  3. 3

    MEP Rough-In

    Mechanical, electrical, plumbing rough-ins before walls closed

  4. 4

    Final

    All work complete, ready for Certificate of Occupancy

Applies to: Commercial Tenant Improvement Permit

  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

    Fire Inspection

    Fire alarm, sprinkler, and suppression system inspections coordinated with the Fire Department

  4. 4

    Final / Certificate of Occupancy

    All work complete, life safety systems functional

Applies to: Residential Addition / Remodel Permit

  1. 1

    Foundation (if new footings)

    Before concrete pour, below the 36-inch amended frost line

  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

Applies to: Deck / Covered Patio Permit

  1. 1

    Footing

    Before concrete pour for structural post footings, below the 36-inch amended frost line

  2. 2

    Framing

    Structural framing before decking/roof cover installed

  3. 3

    Final

    Structure complete per approved plans

Applies to: Plumbing Permit

  1. 1

    Underground / Under-slab

    Before concrete pour — verify pipe slope, materials, cleanouts

  2. 2

    Rough-In

    After pipes installed, before walls closed

  3. 3

    Final

    All fixtures connected, no leaks, proper venting verified

Applies to: Roofing Permit (Reroof)

  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

Applies to: Demolition Permit

  1. 1

    Pre-Demolition Utilities Verification

    Verification that gas, electric, water, and sewer are disconnected before demolition begins

  2. 2

    Final

    Site cleared per approved permit scope

Applies to: Electric Vehicle (EV) Charging Station Permit

  1. 1

    Rough-In

    Wiring and conduit installed before walls closed, per the same framework documented in this file's Electrical Permit entry.

  2. 2

    Final

    Charger installed, panel labeled, system energized and operational.

Applies to: Electrical Permit

  1. 1

    Rough-In

    Wiring and conduit installed before walls closed

  2. 2

    Final

    All devices installed, panel labeled, system energized

Applies to: Mechanical / HVAC Permit

  1. 1

    Rough-In / Equipment

    Equipment installation and gas piping before walls closed or concealed

  2. 2

    Final

    Equipment operational, combustion air and venting verified

Applies to: Solar PV Permit

  1. 1

    Rough Electrical

    Conduit runs, wire sizing, disconnect placement before cover

  2. 2

    Final (Virtual)

    Conducted virtually between 8:00-10:00 a.m. following installation completion; onsite technician contact required

Thornton building permits

Thornton building permitsResidential Building Permit (New Construction)Accessory Dwelling Unit (ADU) PermitCommercial Tenant Improvement PermitResidential Addition / Remodel PermitDeck / Covered Patio PermitPlumbing PermitRoofing Permit (Reroof)Demolition PermitElectric Vehicle (EV) Charging Station PermitElectrical PermitMechanical / HVAC PermitSolar PV Permit

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