The roof is one of the most important and expensive parts of a home, but it is also one of the hardest to inspect fully. Coverings may be high above ground, slopes may face away from public viewpoints and insulation or stored possessions can conceal the structure. A good report separates what was seen from what could not be inspected.
Surveyors consider the roof as a weathering system: coverings, ridges, valleys, flashings, gutters, abutments, ventilation and the supporting structure must work together. One displaced tile might be a local maintenance issue, while repeated patching, widespread slippage and internal moisture evidence can suggest a broader need for investigation.
External coverings and details
The inspection looks for slipped, cracked, missing or deteriorated tiles and slates; weathered ridge and verge details; blocked valleys; and defects at rooflights or dormers. Lead or other flashings at walls and chimneys are vulnerable junctions. Moss is not automatically a defect, although heavy growth can obscure coverings and interfere with drainage.
Roof shape and structure
A visibly uneven roofline can reflect historic character, deflection, altered loading or structural weakness. Inside the roof space, accessible rafters, purlins, trusses and supports are examined for distortion, inappropriate alteration, decay and evidence of leakage. The surveyor does not calculate structural capacity or remove linings to inspect concealed connections.
Moisture and ventilation
Staining, mould, corroded fixings and damp timber may relate to leaks or condensation. Their location, condition and relationship to insulation and ventilation help form an opinion. A dry timber surface during one visit cannot rule out an intermittent leak, and old staining does not prove that water is still entering.
Inspection limitations
Safe access determines the scope. Roofs are not walked during a standard home survey, and high or concealed areas may be viewed from ground level, windows or suitable equipment. In the roof space, deep insulation, boarding, tanks and possessions can obscure important areas. These restrictions should appear prominently in the report.
Planning the next step
Local repairs may be reasonable where defects are isolated and the covering is otherwise serviceable. Widespread deterioration, repeated leaks, major distortion or uncertain hidden construction may justify a roofing specialist or structural engineer. Obtain a written specification before comparing quotations, particularly for an older or listed roof where repair and compatible materials may be preferable to wholesale replacement.
Ask quotations to separate access, coverings, battens, underlay, structural timber, flashings and rainwater work. Provisional sums should state what triggers them. If solar panels, spray foam or a loft conversion affect the roof, establish ownership, installation records and how inspection and future maintenance will be achieved. These matters can change both repair scope and insurability.
Advice for your property
Get the right professional inspection
Online guidance is useful, but it cannot account for the construction, condition and history of an individual property. Tell us what you are buying or need valued and we will explain the appropriate service.
Authoritative sources and further reading
The guide is general information, not property-specific, structural, legal, tax or financial advice. Source pages can change; consult the relevant professional for your circumstances.