The short answer
A new roof can help a sale, but how much it adds cannot be pinned to a number. Value depends on the house, the street and the market. What a roof does reliably is remove a worry: buyers and their surveyors look for a sound, dry roof, and papers that show how it was done. Often a repair, with evidence, serves a seller better than a replacement.
Why no one can give you a fixed figure
You will see claims online that a new roof adds a set percentage to a house price. Treat them with care. Nobody can pin it down, because price depends on the property, the street, the buyer and the state of the market on the day. A roof is one factor among many, so any set percentage is a guess.
What a roof does well is protect value. A house with a dry loft, sound tiles and a clean roofline is easier to sell than one with stained ceilings and a survey full of warnings. The saving shows up in fewer problems, not necessarily in a higher asking price.
That framing helps decide whether the money is worth spending. If the roof is failing, work on it will probably be needed whatever the effect on price, and doing it before marketing the house means you control the timing and the quality. If the roof is sound, a new one is not a way of adding value.
The honest answer for a seller is to look at the evidence on the roof, not at a headline claim, and to ask what a buyer would see.
Our survey can help with that, because it records the roof as it stands before any decision about what to do.
What buyers and surveyors look for
A buyer's surveyor tends to inspect from outside first, then put a head through the loft hatch. Their notes cover the covering, ridge, hips, chimneys, flashing and gutters, plus any sign of damp or sag. If they cannot see something, they say so in the report, and an unknown can worry a buyer as much as a fault.
Common triggers include slipped or cracked tiles, moss in quantity, a leaning chimney, rotten fascias or soffits, and old patch repairs in mortar or sealant. Stained rafters and wet insulation in the loft draw more attention than anything outside.
A report that says the roof is in reasonable condition, with a note of its age and covering, rarely causes trouble. A report that recommends further inspection by a roofer can prompt a request to knock money off, or to repair before exchange.
You can get ahead of that by having the roof looked at before the house goes on the market. Our guide to roof checks when buying a house shows the same list from the buyer's side.
It is far easier to deal with a small problem on your own timetable than on a solicitor's deadline.
Paperwork that helps at sale
Papers turn a roof from an unknown into a known. If the work needed Building Regulations approval, keep the completion certificate or the building control sign-off. Whether a job needs it depends on the work, and the Planning Portal sets the test: building control is not normally needed where less than 25 per cent of the building envelope and less than 50 per cent of the roof is affected.
Beyond that, keep the written scope and the invoice, so that the buyer sees exactly what was done, and when. Dated photographs of the roof as it was opened are especially helpful, because they show the battens, underlay and fixings that nobody can see afterwards.
If the roof was repaired rather than replaced, a short note of what was done and why is worth having too. It tells the next owner which parts are old and which are new.
Put these into a folder and hand it over with the other documents. A solicitor can ask for them, and a buyer's surveyor can read them in minutes.
We provide photographs of what we find as part of a survey, so the record starts at the beginning and not just at the invoice.
Repair or replace before selling
The right answer depends on the roof. A roof with a handful of slipped tiles, a worn ridge or failed flashing can usually be put right with a repair, and that costs less than a replacement. The buyer then sees a sound roof and the repair record in the folder.
A replacement makes sense when the covering or the structure beneath it has run out of useful life, when repairs have become frequent, or when the survey finds widespread decay. Spending on a patchwork of fixes at that point does not remove the buyer's concern, and may waste money.
Be careful of the idea that a new roof must be a selling point. If the existing covering has years left and the timbers are sound, new tiles add little that a buyer can see. If it is clearly tired, they may expect a lower offer, or a roof replacement, anyway.
Ask for a survey, with photographs, and an opinion on whether a repair would hold. Our guide to the yearly roof maintenance checklist helps you keep a record in the meantime.
The sale does not change what a roof needs; it changes when you have to decide. You can read more about our approach on the homepage.
