What it does
Paid plans try Google Solar building data (sloped roof segments and pitch) first. Every plan falls back to OpenStreetMap building footprints.
For roofing contractors
Available nowGoogle Solar roof data, OpenStreetMap fallback
Available now in the RoofCalc app.
How it works
Solar results are graded by imagery quality (high, medium, low) and the grade is returned with the result (not on screen yet). By default, Solar results from imagery taken April to October (leaves on the trees) are skipped in favour of the fallback. The OpenStreetMap path uses the building footprint, and for pitch uses the building's map tag when there is one, otherwise a regional or building-type estimate, because a footprint carries no slope.
What it does not do yet
A LiDAR source is in the code but not part of any plan yet. Footprint estimation and manual tracing tiers are not built.
Checked against the code on .
Related features
Try it on a roof you already know.
Create a free account, choose Contractor, and measure an address you have already measured by hand.