To measure a roof from satellite, enter the property address into a measurement service, confirm the parcel and roof outline on the aerial image, and order the report. The service calculates total area, squares, predominant pitch, ridge/hip/valley/eave lengths, and a waste factor from the imagery. RoofGenius returns the full report in minutes for $10, with the imagery date and a confidence score disclosed on every report.
- →Satellite measurement replaces the ladder-and-tape site visit for bidding
- →You get squares, pitch, ridge/hip/valley/eave lengths, and waste factor
- →Accuracy depends on imagery date, resolution, and roof occlusion (trees)
- →Always check the imagery date and confidence score before you bid
- →RoofGenius reports cost $10 and arrive in minutes
What satellite roof measurement actually measures
A satellite (or aerial) roof measurement report reconstructs the roof's geometry from overhead imagery. From that geometry the report derives the numbers an estimator needs: total roof area in squares, predominant and per-facet pitch, and the linear feet of ridge, hip, valley, eave, rake, and step flashing. Those lengths drive your underlayment, starter, drip edge, ridge cap, and valley metal quantities — the line items that separate a tight bid from a money-loser.
Step-by-step: measuring a roof from satellite
- Enter the street address — not a parcel ID. Confirm the pin sits on the right building, especially on corner lots and multi-structure properties.
- Review the aerial image. Check for tree cover over ridges, new additions the imagery might predate, and detached structures you don't want in the total.
- Confirm the roof outline and facets. On complex roofs (turrets, dead valleys, flat sections), verify the facet breakdown matches what you saw from the street or drone.
- Order the report. You receive area by facet, pitch per facet, length tables, and a suggested waste factor.
- Sanity-check the waste factor against roof complexity: 10% for simple gables, 12–15% for cut-up roofs with multiple valleys and dormers.
- Feed the squares and lengths into your estimate or supplement. The report doubles as documentation the carrier or homeowner can verify.
Satellite vs. hand-measuring: when each wins
| Scenario | Satellite report | Hand measure |
|---|---|---|
| Storm canvassing, 20+ bids a week | Minutes per roof, bid before competitors arrive | Not viable at volume |
| Standard gable/hip residential | Accurate; pitch verified on-roof | Accurate but 60–90 min of labor |
| Heavy tree cover over the roof | Flagged with lower confidence | Better — imagery can't see through canopy |
| Steep or unsafe pitch (10/12+) | No ladder required | Safety risk, slow |
| Flat commercial with rooftop clutter | Units and parapets can confuse facets | Walk it, or combine with drone photos |
How accurate is satellite roof measurement?
Accuracy depends on three things: imagery date, image resolution, and occlusion. A report built on two-year-old imagery can miss a recent addition or a full tear-off rebuild. Low-resolution imagery blurs small facets like dormers. Tree canopy physically hides ridge lines. This is why every RoofGenius report discloses the imagery date and a confidence score, and flags cross-check disagreements over 10% instead of silently shipping a number — you should know when a report deserves a second look before you bid from it.
What a good report includes
- Total area and squares, with per-facet breakdown
- Predominant pitch plus pitch per facet
- Ridge, hip, valley, eave, rake, and step-flashing lengths
- Suggested waste factor with the reasoning
- Aerial and street-view imagery with the capture date
- Pitch and area diagrams you can attach to a supplement or proposal
Measure your next roof from satellite
Order a $10 RoofGenius measurement report — type the address, get squares, pitch, lengths, diagrams, and 5-year storm history in minutes. No subscription required. If you want to see the format first, open the sample measurement report.