Solar Site Survey Services

A solar site survey is the pre-construction visit that converts a sales proposal into a buildable design. A surveyor measures the roof planes and records pitch and azimuth, opens and photographs the main electrical panel to capture the busbar and main breaker ratings, checks the framing in the attic, measures shading on site, walks the conduit routing, and records access conditions. The purpose is not to confirm the proposal. It is to replace every assumption the proposal was built on with a measured fact, because a proposal is built from aerial imagery, a utility bill and a production model, and none of those can see inside an electrical panel.

Because what the surveyor finds contradicts what the proposal assumed, and when the two disagree the survey wins. The three recurring failures are an electrical service that cannot accept the backfeed the design assumed, which is usually a busbar rating that was never read; a roof plane that cannot carry the module count that was sold, once obstructions and setbacks are applied to a real measurement; and shading the remote model under-read. Each of these changes something the homeowner has already agreed to, which is why they are commercially painful rather than merely technical.

Somebody competent to open an electrical panel safely and to work in an attic. That is not a formality: the two highest-value items on any survey list, the busbar and main breaker ratings and the framing measurements, both require access that a sales representative should not be taking. A survey performed without them is a photography exercise, and the design that follows rests on the same assumptions the proposal used. The practical test of a survey standard is whether it can be completed by the person sent to do it.

For a straightforward single-family rooftop system it is commonly measured in a small number of hours on site, and it varies with roof complexity, attic accessibility, the number of planes and whether storage or a ground mount is in scope. Duration is the wrong measure to optimise, though. A survey that returns in half the time and omits the panel label has not saved anything, because the missing item reappears at design as a redesign. Completeness against a written standard is the useful measure, not time on site.

Two categories, and both surface weeks later. Access and logistics, meaning gate codes, dogs, parking, staging, roof access and whether the utility meter can be reached without somebody being home. And the utility account data, meaning a photograph of a current bill. The second is usually treated as a sales artefact rather than survey data, which is why it goes missing, and it is the input that decides who can lawfully sign the interconnection application. Both are trivial to capture while somebody is standing at the property and expensive to obtain afterwards.

Parts of it can be modelled remotely and the results are useful for qualification, but the items that most often change a project cannot. A busbar rating, a main breaker rating and available breaker spaces require the panel to be opened. Rafter size, spacing and span require attic access. Shading measured on site regularly differs from shading modelled from imagery. Remote assessment is a good way to decide whether to send somebody; it is not a substitute for sending them, and treating it as one moves the discovery of every constraint to a later and more expensive stage.

The project goes back into design, and the commercial consequence depends entirely on what the agreement says. A smaller array changes the production estimate and often the price, and either is a change to something the homeowner already signed. A required service upgrade or panel change is a cost that has to land somewhere. Well-drafted agreements name the redesign path in advance: who decides, what happens to price and schedule, and what the homeowner's options are. Where the agreement is silent, the parties negotiate from scratch at the worst possible moment, with a closed deal and a spent survey behind them.