How a remote solar site survey works from nothing but your address

Booking a truck roll just to find out whether a roof is worth quoting is slow and expensive. A remote site survey does the first pass from a desk: feed in an address and reconstruct the roof from satellite and street-level imagery, well enough to lay out panels and estimate production before anyone climbs a ladder. Knowing exactly where the remote data stops and a physical visit must begin is what keeps a fast estimate from becoming a bad design.

What a remote survey pulls from an address

A single address anchors several overlapping data sources, and combining them reconstructs the building:

• Satellite and aerial imagery gives the top-down roof outline, the arrangement of planes, and visible rooftop obstructions.
• Oblique and street-view photography shows the house from the side, revealing roof pitch, the number of stories, the location of the electric meter and service mast, and ground-level obstructions like trees.
• A roof-solar model derived from 3D building and terrain data supplies the geometry and per-roof sunlight numbers that turn a picture into a design surface.

Together these let a tool identify each usable roof plane and its properties without anyone visiting the site.

The roof geometry a remote model captures

The core deliverable is a segmented roof model. For each plane it estimates:

• Roof planes — the distinct facets of the roof, separated by ridges, hips, and valleys, since each faces its own direction.
• Usable area — the square footage available after setbacks, keeping panels back from ridges and edges for fire access and code clearance.
• Pitch (tilt) — the slope of each plane, inferred from imagery and 3D data, which sets how sun angle hits the modules.
• Azimuth — the compass direction each plane faces, the single biggest driver of production after shade.
• Obstructions — chimneys, vents, skylights, and dormers that break up usable area and cast shadows.

Pitch and azimuth together largely determine annual yield; solar panel tilt and azimuth explains how. Feeding this geometry into a sunlight model produces a per-plane production figure, the same math covered in estimating solar production kWh. Our free instant estimate runs this whole pipeline from an address in seconds.

Shade and sun access, remotely

A roof survey is incomplete without shade. Remote models trace the sun's daily and seasonal path against surrounding geometry, trees, neighboring buildings, terrain, to produce a per-pixel sunlight map. That map flags which planes get full sun and which sit in shadow, so a preliminary layout can avoid dead zones from the start. It is genuinely useful, but modeled tree canopy is an approximation and imagery may be a year or two old, so it screens rather than certifies. For the mechanics of why shade matters so much, see shading and solar production.

What a remote survey still cannot see

Here is the honest boundary. A remote survey reconstructs the outside of the roof; it cannot see inside the building or verify the electrical system. Three things almost always require a physical visit:

Framing capacity is its own discipline; solar structural review explained covers what an engineer checks. The panel rating drives system size limits, which ties into how to size a residential solar system.

Where remote ends and the truck roll begins

The productive workflow treats the remote survey as a filter and a head start, not a replacement for the visit. Use it to disqualify hopeless roofs, produce an accurate quote, and pre-build a layout, then send a technician only for the roofs worth pursuing, and let that visit focus on the three things remote can't see: attic, panel, and conduit path. That sequence cuts wasted truck rolls without pretending a satellite can read a busbar label.

Imagery predating a recent reroof, a new addition, or a removed tree is the most common trap, so every remote measurement is a confirm-on-site value, not a final one. Used that way, a remote survey does most of the design work before the truck ever leaves.

Start remote, confirm on-site

Run the free instant estimate to model the roof from your address, review the plane-by-plane geometry and shade, and decide whether the project is worth a site visit. If the numbers look promising, is my roof good for solar is the natural next read before scheduling one.

Educational reference, reviewed 2026-07. A design aid, not a substitute for a licensed electrician or PE. Confirm the enforced NEC edition and local amendments with your AHJ.