The short answer
Yes — a building survey includes the loft / roof void wherever it is safely accessible, and it is one of the most informative parts of the inspection. The surveyor enters through an accessible hatch and examines the roof timbers (rafters, purlins, ceiling joists), the underside of the covering and sarking felt, the insulation type and depth, the ventilation, party walls in the roof space, and any water tanks or services. They look for active leaks, sagging or undersized timbers, woodworm flight holes, wet or dry rot, condensation, and amateur structural alterations. The limit is access and safety: a sealed, boarded, insulated-to-the-rafters or unsafe loft cannot be fully inspected, and the surveyor will only go where it is reasonable to do so. Anything not seen is recorded as a limitation.
The roof void often tells a surveyor more than the outside of the roof ever could. Here is what is checked up there and what can stop the inspection.
Loft inspection at a glance
- Included?Yes, if safely accessible
- AccessVia existing hatch only
- ChecksTimbers, felt, insulation, ventilation
- Stops ifBoarded, sealed, unsafe, no hatch
- RecordsAreas not seen as limitations
What the roof void reveals
Once inside, the surveyor reads the roof from the underside. They inspect the rafters, purlins and ceiling joists for sagging, splitting, undersizing or signs of overloading, check the underside of the tiles or slates and the sarking felt for daylight, water staining or active drips, and assess the insulation — its type, depth and whether it is laid correctly without blocking the eaves ventilation. They look for woodworm (small round flight holes and frass), wet rot and the more serious dry rot, and they note the state of any cold-water tanks, pipework or electrical cabling running through the space. The party wall in a terrace or semi is checked for fire separation and gaps. Past DIY alterations — cut rafters for a conversion, removed bracing — are an important flag here.
What stops the inspection
The surveyor will only enter a loft where it is reasonable and safe. Several common situations limit or prevent access, and each is recorded honestly in the report rather than glossed over.
| Situation | Effect on inspection | Reported as |
|---|---|---|
| No hatch / sealed hatch | Cannot enter | Roof void not inspected |
| Fully boarded floor | Timbers below boards hidden | Limited inspection |
| Insulated to rafters | Felt and rafters covered | Limited inspection |
| Stored belongings | Areas obscured | Partial view only |
| Unsafe access / no floor | Head-in view only | Inspected from hatch |
Indicative access limits; the report states what was and was not seen. Source: RICS Home Survey Standard.
Why the loft findings matter to a buyer
The roof void is where a survey often catches problems that the outside of the house hides. An active leak shows here as staining or wet timber long before it reaches a ceiling below. Condensation in a poorly ventilated roof can rot timbers quietly over years. A loft conversion done without proper structural support — cut rafters, no steels, missing fire separation — is both a safety and a compliance issue. And insulation that is thin or missing is a straightforward energy cost. Because the surveyor's access depends on the property on the day, it is worth ensuring the loft hatch is clear and reachable before the visit, so this valuable part of the inspection is not lost to a blocked or sealed hatch.
Frequently asked questions
Does the surveyor always go into the loft?
Only when there is an accessible hatch and it is safe to enter. If the hatch is sealed, the space is fully boarded or insulated to the rafters, or access is unsafe, the surveyor records that the roof void could not be fully inspected.
What does the surveyor look for in the roof void?
Roof timbers for sagging, rot or woodworm; the underside of the covering and felt for leaks; insulation depth and ventilation; party-wall fire separation; and any DIY structural alterations such as cut rafters from a loft conversion.
Can a building survey miss a roof problem if the loft is boarded?
Yes. A fully boarded loft hides the joists and parts of the structure, and insulation laid to the rafters covers the felt. The surveyor reports the limitation, and a follow-up inspection may be advised if concerns remain.
Sources & further reading
Figures on this page are typical UK ranges drawn from published sources and depend on the specific property and survey level. They are guidance, not a quotation.