Roof measurement accuracy in RoofSell depends on how well the building is mapped and how simple the roof is. The number is built for a fast first quote. Treat it as a starting point, and confirm the roof on site before you sign a contract.
What affects roof measurement accuracy
- Map data age. Outlines come from mapping data, which can lag behind reality. New builds, recent additions or a garage that's been torn down may be missing or out of date.
- Roof shape. RoofSell uses one slope per structure. A roof that mixes steep and low sections gets an average, which can make the surface a little high or low.
- Slope detection. The slope comes from Google's Solar API. Where Google has no data for a building, the widget defaults to Medium, and it's up to the homeowner to change it.
- Homeowner edits. Homeowners can drag the outline and change the slope before they submit, so a wrong guess on their side changes the number.
- What isn't measured. The estimate doesn't know about tear-off layers, decking condition, chimneys or other site conditions. It prices roof area by slope, waste factor and product.
How to check a measurement
- On the Dashboard, click the contact name to open the lead.
- Look at the outline on the map and the Roof Details in the Roofing tab.
- Click OPEN QUOTE to fix anything. Use Edit Roof Map to move the outline, change a structure's slope (custom angles up to 12/12 are available here), or adjust the waste factor.
- Click Save & Send to email the corrected quote to the homeowner, or Save to keep it for later.
When to measure on site instead
Plan a site visit or order a full measurement report when the roof has many sections at different pitches, the house is new or recently remodeled, or the outline on the map clearly doesn't match the building.
If the widget found no building at all, see what to do when an address is not found.
How satellite roof measurement works explains the data sources, and our post on satellite roof detection goes deeper.