A roof comment in a homebuyer survey can stop a purchase in its tracks. The report lands, the roof paragraph carries a warning rating, and suddenly a house you had already furnished in your head looks like a gamble. Most of the time the surveyor has looked at the roof from the ground, through binoculars or from the loft hatch, and has written down what could be seen, not what is wrong. That distinction is the whole point of this page. A flag is a reason to ask a better question, and the answer can range from a few cracked tiles to a roof at the end of its life. Here is how to find out which one you are dealing with before you exchange contracts.
What the surveyor actually wrote
Read the roof section slowly and separate three things: what was seen, what was guessed and what was not inspected. Surveyors working to the RICS Home Survey standards use condition ratings from 1 to 3, with a separate marker for areas that were not inspected. A rating of 3 means the defect is serious or urgent. A rating of 2 means there is a defect that needs repair or replacement but is not yet serious. A rating of 1 means no repair is currently needed. You can read how the levels work on the RICS website, and our page on RICS survey levels and what they say about roofs goes into what each level covers on the roof itself.
The wording matters as much as the number. Phrases such as "slipped tiles to the rear slope", "failing mortar to the ridge" or "staining to the chimney breast in the loft" point at a specific part. Phrases such as "the roof covering is nearing the end of its life" or "further investigation by a roofing specialist is recommended" are broader and often mean the surveyor could see wear but could not judge how much remains. Notice also what the report says about access. If the surveyor could not enter the loft, or could only see one slope, the rating covers only that part of the roof.
The usual things a survey flags
Certain defects turn up again and again, and each has a different weight. Knowing which sort you have been handed shapes everything that follows.
Slipped, cracked or missing tiles are the most common and usually the cheapest to deal with. Tiles slip when the nibs that hang them on the battens (the horizontal timber strips fixed across the rafters) break, or when the nails holding them corrode. A scattering of them on an otherwise sound roof is a repair job.
Crumbling ridge or hip mortar is the next favourite. The bedding under the ridge tiles weathers, cracks and drops out, leaving the tiles loose. Current standards expect ridge, hip and verge tiles to be mechanically fixed rather than relying on mortar alone, so a proper repair usually means re-bedding with mechanical fixings or fitting a dry-fix system.
Moss and lichen look dramatic in a photograph and are often harmless to the covering itself, though heavy growth can hold water against tiles and block gutters.
Flashing and chimney problems deserve more attention. Flashing is the strip of lead or other metal that seals the joint where a roof meets a wall or chimney. When it lifts or cracks, water gets into the structure and shows up as stains inside, and that is the point at which a surveyor often escalates the rating.
Sagging or distorted roof lines are the serious end. A dip in a ridge, a bowed slope or a leaning chimney suggests a timber, wall plate or support problem rather than a surface fault, and it needs a proper look from above and from inside.
Get the roof looked at before you exchange
When the survey has put a question mark over the roof, the most useful single step is a hands-on inspection by someone who repairs roofs for a living. The surveyor's job is to give a broad opinion on the whole house in a limited time. A roofer's job is narrower: get up there, check the covering, the junctions and the timbers, and say what is wrong and what it takes to put right.
Ask the seller, through your solicitor or the estate agent, for access to the loft and the roof. Sellers usually agree, because a clear answer helps the sale along. Where the house is empty or the roof is tall, access is often arranged with a ladder or tower; do not climb up yourself, as our guide on inspecting your own roof safely explains.
Our free survey with photos of the actual roof is built for this moment. We go up, photograph every flagged area and the parts the surveyor could not reach, and write down what each fault needs: a repair, a partial re-cover or a full replacement. You get pictures and a fixed written quote you can hand to your solicitor, rather than a verbal guess. If the roof has years left, we say so. If you would like a single place to start, our roof inspections in Basingstoke page sets out what a visit involves.
Working out the cost of what you found
The cost of dealing with the flag falls into three bands, and the bands are far apart. A handful of slipped tiles or a re-bedded ridge is a repair, usually completed in a day. A section of failed flashing or a damaged valley is a larger repair that may need scaffolding. A roof whose covering has simply worn out is a replacement, and the national picture is wide. One cost guide reports £6,500 to £10,500 for a re-roof of a three-bedroom semi in concrete tile, and another gives £4,000 to £13,000 for a new roof on a standard semi or detached house. These are typical UK ranges, for orientation only. Your fixed quote follows the survey. The full cost breakdown at new roof costs in detail shows what pushes the figure up or down.
Scaffolding is the cost people forget. Almost any work on a pitched roof above the first floor needs it, and it can be a significant part of a small job's price. Ask any contractor to show scaffold as a separate line so you can see what the repair itself costs.
| What the survey says | What it often turns out to be | Likely next step |
|---|---|---|
| Slipped or missing tiles | Broken nibs or corroded nails on an otherwise sound roof | Repair, then re-check |
| Mortar loss at ridge or hip | Weathered bedding, tiles loose underneath | Re-bed with mechanical fixing |
| Stains in the loft | Failed flashing, broken tile or a blocked valley | Locate the source, then repair |
| Roof near end of life | Worn covering, brittle felt, tired battens | Priced replacement plan |
| Sag or distortion | Timber, wall plate or support problem | Close inspection before any decision |
Using the findings in the purchase
Once you have a roofer's written findings and a fixed figure, you hold something concrete. Your solicitor can raise it with the seller's side, and there are a handful of routes. You can ask the seller to complete the repair before exchange. You can ask for a price reduction that reflects the quote. Or, where the roof is sound apart from an easy fix, you can accept it and budget for the work. Our short answer on whether you can renegotiate the house price over roof defects looks at how this usually plays out.
It also helps to remember what the lender will do. A mortgage valuation is a quick check for value, not a condition survey, and it may or may not mention the roof; our note on whether a mortgage valuation spots roof problems covers the difference. If the valuer does flag the roof, the lender may attach a condition such as a satisfactory report, which is one more reason to have a roofer's findings ready.
Be wary of the opposite mistake too. A roof that carries a minor note does not need to hold up a purchase. Plenty of older houses have roofs that need a little attention and plenty of seasoned roofs sit comfortably in a survey with a rating of 2. The skill is separating cosmetic ageing from a fault that lets in water or weakens the structure.
Questions to put to the seller
A few direct questions often resolve a worry faster than any report. Ask when the roof was last repaired or re-covered, and whether there are invoices or guarantee paperwork to hand. Ask whether there have been leaks, even old ones, and where. Ask about the loft: has it been boarded, insulated or converted, and when? Ask whether the chimney is in use, since an unused chimney that is capped badly is a common route for damp. A seller who answers openly and produces paperwork is giving you information that a survey cannot.
If the house has a flat roof section, such as an extension or a dormer top, mention it to the surveyor and to us. Flat coverings age on a different clock from tiles, and a survey carried out in dry weather may not show the problem. We cover those roofs in our flat roofing in Basingstoke work.
When the answer is to walk away
Occasionally the roof is the deciding factor. If a close inspection finds widespread rot in the rafters, a covering that has failed across most of both slopes and a structure that has moved, the cost of putting it right can outweigh any sensible discount. The decision is yours, and it is far better made on the strength of photos and a written quote than on a single line in a report. Equally, many buyers find that the flagged roof needs a modest repair and a note in the diary, and they proceed with confidence.
Whichever way it falls, you will have spent a small amount to avoid buying a large unknown. To arrange an inspection of a house you are buying, ring 01256 213956, or WhatsApp us, with the address and the roof section of your survey.
