Solar Photovoltaic (PV) Permit in Frederick, Colorado

Frederick requires a solar photovoltaic (pv) permit for: A Colorado-licensed professional engineer's seal and signature required for ALL non-residential PV installations; for single-family/duplex, required only if the system exceeds 10 kW or includes battery/generator backup; Two complete submittal sets required, including: manufacturer's cut sheets/listing info for PV equipment and inverters; a one-line diagram showing conductor sizes, insulation types, conduit dimensions, breaker/fuse ratings, inverter specs, AC/DC disconnect ratings, and module Isc/Voc; mounting details (with structural engineer calculations if not flush-mounted); ampacity calculations per NEC 690.8 with temperature derating; system voltage compliance documentation; equipment grounding conductor sizing per NEC; a service equipment location drawing; NEC-required safety signage details; NEC 690.12 rapid-shutdown compliance documentation; A stamped structural engineering letter verifying structural adequacy is required for ALL solar projects; A qualified person must be present at inspection: residential systems 200A or less — licensed master/journeyman electrician, residential wireman, or NABCEP-certified solar installer; residential over 200A or any commercial system — licensed master or journeyman electrician only; A framing inspection is additionally required when structural roof enhancements are made; customer must provide a ladder for roof-mounted system inspections; Rapid shutdown system must be tested at final electrical inspection with the inspector present (NABCEP-certified installers may test the DC-side rapid shutdown system). If your project isn't listed, confirm with Town of Frederick Building Department at 720-382-5516 (general questions); 720-382-5620 (inspection request line) before starting work.

In Frederick, the published Residential Solar Device is: $500.00. Additional published fees: Commercial Solar Device — $1,000.00; Plan Review Fee — 65% of Permit Fee (per general Building Permit Fee schedule; the Solar Submittal Requirements page itself states no permit fees). These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Frederick does not publish a plan-review timeline for this permit. Contact Town of Frederick Building Department at 720-382-5516 (general questions); 720-382-5620 (inspection request line) for current turnaround.

You'll need: Permit Application — General (Solar PV scope); Solar PV Submittal Package (two complete sets). See the required-documents checklist on this page for details on each.

Frederick requires 2 inspection(s) for a solar photovoltaic (pv) permit, in order: Framing (if structural roof enhancements made), Final Electrical Inspection. Schedule each through Town of Frederick Building Department (720-382-5516 (general questions); 720-382-5620 (inspection request line)).

Apply through Town of Frederick Building Department at 401 Locust Street, Frederick, CO 80530 (mailing: PO Box 435, Frederick, CO 80530). Phone: 720-382-5516 (general questions); 720-382-5620 (inspection request line), email: building@frederickco.gov. Office hours: Monday-Friday, 7:30 a.m. - 4:30 p.m. Chief Building Official: mtheile@FrederickCO.gov.. Official information: https://www.frederickco.gov/416/Building-Department.

Frederick, Colorado has adopted: 2024 International Building Code (IBC) — Town of Frederick Building Codes page; 2024 International Residential Code (IRC); 2024 International Fire Code (IFC); 2024 International Mechanical Code (IMC); 2024 International Fuel Gas Code (IFGC); 2024 International Plumbing Code (IPC); 2024 International Existing Building Code (IEBC); 2024 International Energy Conservation Code (IECC); 2024 International Swimming Pool and Spa Code (ISPSC); 2024 International Property Maintenance Code (IPMC); 2023 National Electrical Code (NEC); 2025 Colorado Wildfire Resiliency Code (as published by the State of Colorado Division of Fire Prevention and Control); Colorado Model Electric Ready and Solar Ready Code; All codes adopted with local amendments per Frederick Municipal Code, Chapter 18 (Buildings and Building Regulations) — Town of Frederick Building Codes page (frederickco.gov/141/Building-Codes); Note on code-cycle currency: the Town's own Residential/New Construction Building Permit Checklist (a submittal-requirements document, not the code-adoption page) still directs energy-code compliance via '2021 IECC Energy Code' (REScheck, energy rating report, or prescriptive HERS documentation), even though the live Building Codes page lists 2024 IECC as currently adopted — this is the same pattern seen in other Colorado jurisdictions in this corpus where a static submittal PDF lags the actively-maintained code-adoption webpage. The 2024 IBC/IRC/IECC/IMC/IPC/IFGC/IEBC/ISPSC/IPMC + 2023 NEC list from the Building Codes page is treated as the current, governing adopted-code list for this file; confirm current code edition directly with the Building Department (720-382-5516) before finalizing a code analysis for any specific project, since the checklist PDF may not yet be updated to match the webpage.. Local amendments apply — see the Frederick overview page for the full list.

A structural engineering letter verifying structural adequacy is required for ALL solar projects in Frederick. A full professional engineer's seal on the electrical/system design is required for single-family/duplex installations only if the system exceeds 10 kW or includes battery/generator backup; it is required for all non-residential installations regardless of size.