Commercial Tenant Improvement Permit in Thornton, Colorado
Required for tenant finish and remodel work in commercial spaces in Thornton. Reviewed by the City Development Building Inspection Division against the currently adopted commercial codes (2024 IBC/IMC/IPC/IFGC with Thornton amendments, effective July 1, 2025); Thornton publishes a target first-review timeline of 13 working days or less.
Verified 2026-06-30 · Source
When you need this permit
- Complete permit application online via the CityView Portal (registered account required)
- One set of construction drawings required, including a code analysis on the title page, floor plan, wall sections, electrical one-line diagram, mechanical plan, plumbing plan, special systems plan, and (if exterior changes) elevation plans, plus a site plan showing the project's location relative to the building and parking areas
- All plans must bear the original seal and signature of a design professional
- Special Systems plans include fire-rated assemblies, fire stopping, fire/smoke dampers, hood systems, and grease traps/interceptors
- Fire protection system plans must be submitted to and approved by the Fire Department prior to permit issuance
- A complete Com-Check report based on the currently adopted Energy Code, bearing the seal/signature of the mechanical engineer, is required
- A completed water meter form bearing the mechanical engineer's original seal and signature is required
- Code analysis must include occupancy group, construction type, number of stories, building height, actual/allowable floor area, occupant load, exit count/width, and required plumbing fixture calculations
- Permit is not automatically issued — application is reviewed for approval, then payment is made, then the permit is processed and issued
Required documents
- Req
Commercial Tenant Finish Permit Application (CityView Portal)
Online application; registered portal account required
- Req
Plan Review Submittal Requirements — Commercial Tenant Finish
Thornton's checklist for construction drawing content, Com-Check, and water meter form (effective 9/14/2021)
- Req
Com-Check Report
Energy code compliance report based on the currently adopted Energy Code (2024 IECC), sealed by the mechanical engineer
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Building Permit Fee — valuation-based (same table as new construction) | Varies by valuation — $30.00 minimum up to $5,615.25 + $3.75/$1,000 over $1,000,000 | City of Thornton 2026 Building Permit Fee Schedule Table 1; commercial tenant finish valuation follows the same schedule as residential |
| Plan Review Fee | 65% of the Building Permit Fee | — |
| Mechanical, Electrical & Plumbing trade permit fees | $30.00 for the first $1,000 of trade valuation, plus $10.00 for each additional $1,000 or fraction thereof, per trade | Applies separately for each trade (mechanical, electrical, plumbing) included in the tenant finish scope |
Review timeline
1–13 business days
Thornton’s published plan-review target
Inspection process
- 1
Framing / Structural
After framing complete, before walls covered
- 2
MEP Rough-In
Mechanical, electrical, plumbing rough-in before walls closed
- 3
Fire Inspection
Fire alarm, sprinkler, and suppression system inspections coordinated with the Fire Department
- 4
Final / Certificate of Occupancy
All work complete, life safety systems functional
Tips
- Thornton publishes a target first-review timeline of 13 working days or less for commercial tenant improvements and remodels — request current SLA status from Building Inspections if your project is time-sensitive.
- The permit is NOT automatically issued after submittal — it goes through review and approval first, then payment, then issuance; budget for this sequencing when scheduling contractor start dates.
- Fire protection system plans must be separately submitted to and approved by the Fire Department before the building permit can be issued — start this track in parallel with your building plan submittal.
Frequently asked questions
- How long does commercial tenant improvement review take in Thornton?
- Thornton publishes a target first-review timeline of 13 working days or less for commercial tenant improvement and remodel permits, per the City's Plan Review Submittal Requirements document.
- What plans are required for a commercial tenant finish permit in Thornton?
- One set of construction drawings including a code analysis, floor plan, wall sections, electrical one-line diagram, mechanical plan, plumbing plan, special systems plan (if applicable), elevation plans (if exterior changes), and a site plan — all bearing the seal and signature of a design professional, plus a Com-Check energy report and a water meter form.
Sources & verification
Verified against official sources. Last reviewed 2026-06-30.
- City of Thornton — City Development, Building Inspection Division — official building department
- City of Thornton — Plan Review Submittal Requirements: Commercial Tenant Finish (PDF, effective 9/14/2021)
- City of Thornton 2026 Building Permit Fee Schedule (PDF)
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.
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