Arapahoe County Building Division requires combination building and electrical permits for residential solar PV installations. The county participates in the SolarAPP+ instant permit program for qualifying rooftop systems, often returning permits within one business day.
Arapahoe County Building Division requires a combination permit (building + electrical) for all residential solar photovoltaic installations. Submittal requires a structural calculation or roof framing verification, electrical single-line diagram, site plan showing array layout, and utility interconnection agreement. For standard rooftop systems under 38.4 kW, the county accepts SolarAPP+ applications, an automated permit platform developed by NREL that returns approval the same day for compliant designs. Required fire setbacks follow the 2018 IFC/IRC: 3 feet on either side of the roof ridge, 3 feet from roof edges on gabled roofs, and a clear pathway 18 inches wide to the ridge. Ground-mount systems require zoning review for setbacks (typically 5-10 feet from side/rear property lines) and are subject to the 35-foot height limit. Interconnection with Xcel Energy or IREA requires a separate net metering agreement after final inspection.
Installations without permits trigger a stop-work order, retroactive permit fees plus 2x standard fee investigation charges, and potential system disconnection until cleared. Fire-setback violations must be corrected before final approval.
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See how Arapahoe County's panel permits rules stack up against other locations.
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