Residential Addition / Remodel / Alteration Permit in Flagstaff, Arizona
VerifiedRequired for additions, remodels, and structural alterations to existing one- and two-family dwellings in Flagstaff, including decks over 30 inches high or over 200 sq ft, garages, and interior remodels affecting structural or life-safety elements. Reviewed against the 2018 IRC as adopted by the City of Flagstaff. Apply through the Citizen Access Portal.
Verified 2026-07-03 · Source
When you need this permit
- Building permit required for additions, remodels, and alterations affecting structural, fire, or life-safety elements
- Decks over 30 inches above finished grade, over 200 sq ft, or attached to the main structure require a Building Permit; smaller detached decks use the Minor Improvement Permit (Zoning) instead
- Small Residential Plans category (per City review-timeframe schedule) explicitly includes additions, garages, decks, remodels, repairs, carports, storage sheds greater than 200 sq ft, ramadas, greenhouses, and sun rooms
- Plans must comply with City of Flagstaff Building Design Criteria (60 psf ground snow load, 115 mph wind, Seismic Category C, 30-inch frost depth)
- Additions/alterations to existing 1-2 family dwellings are exempt from the new-construction EV charging circuit requirement
Required documents
- Required
Residential Building Permit Application (PDF)
Submitted via the Citizen Access Portal
- Required
Construction Drawings
Site plan and framing/structural details showing scope of work and connection to the existing structure
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Building Permit Fee (valuation-based, ICC February 2017 BVD methodology) | Gross Area x Square Foot Construction Cost x 0.01 permit fee multiplier, plus 65% plan review fee | City of Flagstaff Resolution 2017-21; BVD does not apply cleanly to alterations/repairs of existing structures per ICC guidance, but the City uses this methodology as its general fee basis |
Review timeline
20–35 business days
Flagstaff’s published plan-review target
Inspection process
- 1
Footing/Foundation
Required before concrete pour for deck posts, garage foundations, or addition footings
- 2
Framing
Structural framing, connections to existing structure
- 3
Final
All work complete per approved plans
Tips
- 'Small Residential Plans' (additions, garages, decks, remodels, repairs, carports, sheds over 200 sq ft, ramadas, greenhouses, sun rooms) get a 10-working-day Administrative Completeness Review + 25-working-day Substantive Review = 35 working days overall.
- Revisions to already-approved plans have a separate, shorter timeframe: 10 working days Administrative Completeness Review + 10 working days Substantive Review = 20 working days overall.
- Decks 30 inches or less above grade, unattached, and 200 sq ft or under may qualify for the $80 Minor Improvement (Zoning) Permit instead of a full Building Permit — confirm with the Planner of the Day.
Frequently asked questions
- Do I need a building permit for a deck in Flagstaff?
- A Building Permit is required for decks over 30 inches above finished grade, over 200 sq ft, or attached to the main structure. Smaller, detached decks can use the $80 Minor Improvement Permit (Zoning) instead. Source: City of Flagstaff Minor Improvement Permit Application checklist.
Sources & verification
Verified against official sources. Last reviewed 2026-07-03.
- City of Flagstaff Building Safety Section (Planning & Development Services, Community Development Division) — official building department
- Building Permits | City of Flagstaff
- Residential Building Permits Plan Review Process and Timeframes (PDF) | City of Flagstaff
- Minor Improvement Permit Application (PDF) | City of Flagstaff
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 Flagstaff building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.
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