The short answer
A roof survey is a specialist inspection of the covering, structure, flashings and drainage by someone who works on roofs. A building survey is a whole-property report, usually by a chartered surveyor, where the roof is one section among many. If the building survey raises a concern about the roof, or the roof is old or unusual, commissioning both is sensible.
What each survey is built to do
A building survey, often an RICS Home Survey Level 3 carried out by a surveyor regulated by RICS, is a broad report on the condition of a property: walls, floors, damp, services, drainage, windows and the roof. Its job is to give a buyer a rounded view of the whole building and to flag anything needing further investigation. Under the RICS Level 3 scope, the surveyor views the roof from the ground or neighbouring public property, usually with binoculars, and enters the roof space where it is safe and reasonable to do so, rather than climbing over the covering.
A roof survey narrows that to one element and goes deeper. A roofer inspects the covering slope by slope, the ridge, hips, verges, valleys and flashings, the gutters, and the timbers and underlay in the loft. The output is a report with close pictures of the roof itself and a view on what is sound, what needs repair and what is wearing out.
Where the two differ in practice
The difference shows in the detail. A building surveyor might write that tiles appear weathered and a specialist should have a look. A roofer can tell you which tiles, how many are loose, whether the battens beneath are sound and what a repair involves. That is the gap between a flag and a plan.
| Feature | Roof survey | Building survey |
|---|---|---|
| Scope | Roof and rainwater goods only | Whole property |
| Done by | A roofer or roofing specialist | A chartered surveyor, often under RICS standards |
| Roof detail | Slope by slope, with close photographs | An overall view, often from ground level |
| Typical outcome | Repair or replacement advice and a priced scope | A condition rating and recommendations for specialists |
Neither replaces the other. Our guide to what a roof survey covers sets out the roofing side in full.
Another difference is language. A building survey grades elements with a condition rating that tells you how much attention they need, but it rarely says what the work costs. A roofer's report is written to be priced, which is why it ends with a defined scope that a quote can follow.
When to have both
If you are buying, remember that the lender's valuation is not a survey. RICS says its only purpose is to show the lender that the property offers reasonable security for the loan. The building survey is the one you commission for yourself, and it tells you about the wider house. Add a roof survey when the roofing section says anything beyond routine wear. Patched ridges, sagging slopes, stains on loft timbers, or the words "further investigation" are all prompts.
Some roofs justify a specialist from the start. A stone slate roof, a lead-lined valley, a flat roof or an older slate roof gets a paragraph or two in a general report, and the fixings that decide its life are hidden from the ground. A mortgage can also hinge on the roof, and we cover when a separate survey pays for itself in our answer on needing a roof survey when buying.
Cost and timing compared
In MyBuilder's 2026 inspection guide, a roof survey is priced at £150 to £500, with standard surveys at £150 to £250, drone surveys at £200 to £400 and thermal surveys at £300 to £500. A full building survey costs more because it covers the entire property, so a roof survey is a modest addition to the overall cost of buying.
Timing matters too. A roof survey is usually quicker to arrange than a building survey, and a roofer can often fit one around a purchase timetable. Our note on how long a roof inspection takes gives a realistic idea of what happens on the day.
Putting the two reports side by side
The strongest approach is to hand the roofer the building survey's wording on the roof and ask them to answer it point by point. The reports then fit together: the surveyor describes the house, and the roofer says what the roof needs, what it costs to put right and what can wait. With both in hand a buyer can negotiate on price, or decide the roof is a sensible risk.
Our survey records its findings in pictures of your roof, and any quote that follows covers the whole job, with scaffold at the start and making good at the end. Work we complete is covered by a written 10-year workmanship guarantee. A seller, too, can commission a roof survey first, so a buyer's surveyor meets a documented roof, not a question mark.
A practical order of play
For most buyers the sequence is simple. Read the building survey first. Mark every sentence that touches the roof, the chimneys, the gutters or the loft. If anything is vague, send those lines to a roofer and book a visit before exchange. If the roof is plainly in good order, record the date and move on.
Do not wait until after completion. A problem found before purchase gives you leverage; the same problem found afterwards is yours. For the wider service, see our roof inspections and surveys page.
Remember the limits of each report. A building survey is written for the buyer's decision about the whole house, and its terms restrict what the surveyor inspects, so parts that are covered, closed off or out of reach are noted as not seen. A roof survey has limits as well: it says little about walls, floors or drains. Together they close most of the gaps. If your house is listed or in a conservation area, tell the roofer, as like-for-like repair and consent questions can change what is sensible to propose; check with Stroud District Council's planning team before assuming anything.