Can Flagstaff require a professional engineer's stamp for my solar panel installation?

Only if the City determines an engineering stamp is necessary, in which case it must provide the permittee a written explanation of why. This is a statewide protection under Arizona Revised Statutes Section 9-468(A)(1)(e), which applies to the City of Flagstaff as a municipality.

How much does a solar PV permit cost in Flagstaff?

The City has no separate solar permit fee schedule. A rooftop PV installation is billed as a standard Building Permit using the February 2017 ICC Building Valuation Data methodology (project valuation x 0.01 permit fee multiplier, plus a 65% plan review fee, per City Council Resolution 2017-21), plus an Electrical Permit for the wiring/interconnection scope. Per ARS 9-468(B), any solar-specific charge cannot exceed the City's actual cost of issuing the permit.

Solar Photovoltaic (PV) Permit in Flagstaff, Arizona

Verified

Required for installation of rooftop or ground-mount solar photovoltaic systems in Flagstaff. The City has no separate solar-specific permit type or fee schedule: a PV system is permitted and billed as a standard Building Permit (plus Electrical Permit for wiring) under the City's valuation-based fee methodology (Resolution 2017-21), and mounting-system structural design is governed by the City's general Building Design Criteria (60 psf ground snow load, 115 mph wind, Seismic Design Category C). Process/documentation limits and timeline protections are set by the statewide overlay, Arizona Revised Statutes Section 9-468, which caps required documentation, limits professional-engineer stamp requirements, and caps solar permit fees at the actual cost of issuance. The 2018 International Solar Energy Provisions (ISEP) are adopted as part of the City's 2018 code suite.

Verified 2026-07-03 · Source

FromProject valuation x 0.01 permit fee multiplier, plus 65% plan review feeBuilding Permit Fee (valuation-based, ICC February 2017 BVD methodology, applied to solar/rack-mount project value) — see all 2 fees below

When you need this permit

Photovoltaic system installation location must be indicated on construction plans, including roof plan and elevation (ARS 9-468)
Photovoltaic panel mounting details must be included in installation plans (ARS 9-468)
Electrical diagrams must include one-line or three-line diagrams, unless a qualified online automated permitting platform is used to verify code compliance (ARS 9-468)
For DC-to-AC conversions, inverter cut sheets and listings must be included in the plans (ARS 9-468)
The City may not require a professional engineer's stamp for a solar PV system unless deemed necessary, and must provide a written explanation if one is required (ARS 9-468)
PV mounting-system structural design (roof/rack attachment, load path) must meet the City's Building Design Criteria: 60 psf ground snow load, 115 mph wind design speed, Seismic Design Category C — there is no separate solar-only structural standard; the general Design Criteria governs
The PV installation is permitted and fee-calculated as a standard Building Permit (roof/rack-mounted structure) plus an Electrical Permit for the wiring/interconnection scope, using the City's valuation-based fee methodology (Resolution 2017-21); no dedicated solar permit fee schedule exists
Accessory Energy Systems (including PV solar) are subject to a building permit and are further limited by Flagstaff zoning ordinances for visual, design, height, and setback requirements
Solar-Ready Zone provisions (2018 IRC Appendix T / IECC Appendix RA) apply to new construction of detached one- and two-family dwellings and townhouses
Any building/permit fee for solar construction must be attributable to and not exceed the actual cost of issuing the permit, with an itemized cost list available on request (ARS 9-468(B))
Apply through the Citizen Access Portal

Required documents

Required
Residential or Commercial Building/Electrical Permit Application
Submitted via the Citizen Access Portal; solar PV plan set per ARS 9-468 documentation requirements
Required
One-Line or Three-Line Electrical Diagram
Required unless a qualified online automated permitting platform verifies code compliance
Required
Inverter Cut Sheets and Listings
Required for DC-to-AC conversion equipment

Fee schedule

Fee type	Amount	Notes
Building Permit Fee (valuation-based, ICC February 2017 BVD methodology, applied to solar/rack-mount project value)	Project valuation x 0.01 permit fee multiplier, plus 65% plan review fee	City of Flagstaff Resolution 2017-21, effective August 1, 2017 — the same governing fee schedule used for the Residential Building Permit (no separate solar fee schedule exists); per ARS 9-468(B), any solar-specific charge must not exceed the actual cost of issuing the permit
Electrical Permit (interconnection/wiring scope)	Over-the-Counter electrical fee schedule (e.g., $29.90 base fee plus itemized circuit/service charges) for minor interconnection work, or full Building Permit electrical review for larger installations	City of Flagstaff Over-the-Counter Permit Application (Rev. 06/10/2025); governed by the 2017 NEC as adopted and locally amended

Review timeline

10–35 business days

Flagstaff’s published plan-review target

Inspection process

1
Rough Electrical
Conduit runs, wire sizing, and disconnect placement before energizing
2
Final
Panel mounting, racking attachment, roof penetration sealing, electrical connections, and interconnection point verified

Tips

Arizona Revised Statutes Section 9-468 sets statewide floors on what the City can require for solar PV plan documentation and prohibits requiring a PE stamp without a written justification — this is a state law overlay on top of Flagstaff's own building code.
Flagstaff has no dedicated solar-only permit type, fee schedule, or design-load handout; a rooftop PV system is governed by the same general Building Permit fee methodology (Resolution 2017-21) and the same Building Design Criteria (60 psf snow, 115 mph wind, Seismic Category C) that apply to the Residential Building Permit, plus an Electrical Permit for the wiring/interconnection. This was re-confirmed by checking the City's full Building Permits document list (flagstaff.az.gov/5140), the Additional Building Permit Resources page (flagstaff.az.gov/5164), and the Energy Efficient & Resilient Construction resource page (flagstaff.az.gov/5125, which covers solar rebates/tax credits but not permit plan requirements) — none list a solar-specific plan-requirements checklist or handout.
reviewTimelineDays reflects the City's published ARS 9-835/9-836 'Small Residential Plans' review track, the governing plan-review category for a rooftop residential PV/rack-mount permit: 10 working days Administrative Completeness Review + 25 working days Substantive Review = 35 working days overall. The City publishes no solar-specific timeframe; a residential PV permit is reviewed under this general residential track. Source: City of Flagstaff Residential Building Permits Plan Review Process and Timeframes (PDF).

Frequently asked questions

Can Flagstaff require a professional engineer's stamp for my solar panel installation?: Only if the City determines an engineering stamp is necessary, in which case it must provide the permittee a written explanation of why. This is a statewide protection under Arizona Revised Statutes Section 9-468(A)(1)(e), which applies to the City of Flagstaff as a municipality.
How much does a solar PV permit cost in Flagstaff?: The City has no separate solar permit fee schedule. A rooftop PV installation is billed as a standard Building Permit using the February 2017 ICC Building Valuation Data methodology (project valuation x 0.01 permit fee multiplier, plus a 65% plan review fee, per City Council Resolution 2017-21), plus an Electrical Permit for the wiring/interconnection scope. Per ARS 9-468(B), any solar-specific charge cannot exceed the City's actual cost of issuing the permit.

Sources & verification

Verified against official sources. Last reviewed 2026-07-03.

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.

Other permits in Flagstaff

Residential Building Permit (New Construction)Residential Addition / Remodel / Alteration Permit Electrical Permit Plumbing Permit Mechanical / HVAC Permit Re-Roofing Permit Demolition Permit Fence and Retaining Wall Permit (Minor Improvement Permit)

Solar Photovoltaic (PV) Permit in other cities

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