Stand far enough back to see the whole roof
Begin from the opposite side of the road or another safe public viewpoint. Look along the ridge and roof slopes for dips, uneven lines, missing tiles and areas that have been patched with a different material. Compare the roof with adjoining houses if the properties were built together.
Binoculars or a camera zoom can help, but do not climb onto roofs during a viewing. Moss alone does not prove failure. More useful signs include slipped coverings, damaged edges, daylight around details and gutters that sag or discharge down the wall. Ask your surveyor what could and could not be seen from the available positions.
Chimneys have several possible weak points
Check whether pots are secure, brickwork is weathered and the flashing where the stack meets the roof looks complete. Bulging masonry, open joints and vegetation need attention. A chimney can leak through its top, sides, flashings or the roof beside it, so an internal stain does not identify the repair by itself.
Inside, look at chimney breasts in bedrooms and lofts. Brown marks, salt deposits or recently painted patches are worth recording. Ask whether unused flues are capped and ventilated. If a chimney breast has been removed below but remains above, the surveyor should consider how the remaining masonry is supported.
Gutters tell you what happens when it rains
Dry weather makes faulty rainwater goods easy to overlook. Look for staining beneath joints, green growth down walls, washed-out ground and short downpipes ending beside the building. A gutter that appears sound from below may still fall the wrong way or be blocked. Ask the seller about overflowing during heavy rain.
Check where each downpipe goes. Some discharge into gullies; others feed soakaways or drainage systems. Water collecting beside a wall can contribute to dampness inside and affect shallow foundations over time. The repair may be modest, but resulting plaster, timber or ground damage can add considerably to the job.
Use the loft if safe access is offered
Do not enter an unsafe loft or step between joists. From a boarded or properly accessible position, look for daylight, staining, wet insulation, damaged timbers and makeshift supports. A roof can leak intermittently, so dry timber on viewing day does not erase old water marks. Ask when any patching was done.
Notice ventilation at the eaves and whether insulation has been pushed tightly into gaps. Heavy condensation can wet nails and underfelt without a hole in the covering. Stored belongings may hide areas, and spray foam can conceal the underside of the roof. Make sure the surveyor knows if access is restricted or materials prevent a normal inspection.
Flat and low-pitched roofs need their own questions
Ask what covering was used, how old it is and whether there is a guarantee that can actually be transferred. Look for ponding, blistering, split edges and blocked outlets where these are visible. Falls can be slight, but water should have a route to a suitable outlet rather than sitting indefinitely.
Ceilings below may show staining at corners, roof lights or wall junctions. Recent decoration needs an explanation if the surrounding room has not been redecorated. Insulation and ventilation details matter as much as the outer membrane. A specialist roofer may be needed when the surveyor cannot safely access the roof or its condition is uncertain.
Turn observations into a realistic allowance
Ask whether work is a local repair, planned maintenance or likely renewal. Those are very different budgets. Access, scaffolding, roof height, adjoining property and the need for chimney work can cost as much as the visible materials. Obtain a written quotation when the price affects your offer.
Check whether the proposed repair deals with the route of water not merely the stain below. If substantial work is expected, ask about building regulations, insulation upgrades and any conservation restrictions. An old roof can still give useful service, but your budget should reflect its current condition and the evidence available, not an optimistic guess about how long it might last.
If the seller has made an insurance claim for roof or storm damage, ask for the repair scope and final invoice. A claim record alone does not show whether all recommended work was completed.