| Usable roof plane area | Aerial imagery at 15–30 cm ground sample distance, building footprint polygons | Measures the contiguous membrane left after curbs, skylights and fire-code setbacks, which is what sizes an array. It does not confirm structural capacity for ballast. |
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| Roof form and membrane type | Imagery, oblique views where flown, assessor construction and roof-cover fields | Separates low-slope single-ply and modified-bitumen decks, where ballasted racking is normal, from standing-seam metal, gravel BUR and steep-slope tile. Thickness and remaining life need a core cut. |
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| Obstruction and shading load | Imagery, adjacent building heights, tree canopy extents | Counts rooftop units, condensers, exhaust fans, skylights and parapet height, and flags buildings shaded from the south. A shade-loss percentage needs a 3D model or a site survey. |
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| Roof age and last roof event | Assessor year-built, municipal reroof and recover permits with valuations | Gives the date of the last permitted roof work, the best predictor of whether an owner will accept a 25-year asset on the deck. Unpermitted reroofs and coatings leave no record. |
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| Residential roof planes and street pattern | Imagery, assessor roof-cover, year-built and living-area fields, residential reroof and PV permits | On houses the evidence shifts to plane orientation, pitch and canopy shading, plus the assessor's roof-cover and year-built fields. Permits cluster by subdivision, so one filing often marks a street. It does not establish household finances. |
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| Utility, tariff and interconnection regime | Utility service territories, published commercial and residential rate schedules, state net-metering and interconnection rules | Establishes which utility, rate structure and interconnection process a project runs through — a live market or a dead one. It does not give the account's rate class or service size. |
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| Owner-occupied versus leased | Assessor owner of record, owner mailing address (the rental test on a house), business listings | Flags the properties where whoever benefits from the power also controls the roof, which is the fastest path to a signature. Whether a specific lease permits a rooftop asset is only in the lease. |
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| Array already present | Imagery panel signatures, PV-scoped electrical permits, state interconnection registries | Removes roofs already served from the new-installation queue. Those buildings are the input to a maintenance and repair territory, which is a different report. |
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