Here is the answer most roofing companies will not put in writing: most leaking roofs need a repair, not a replacement. A slipped tile, a tired flashing or a blocked valley does not mean the roof is finished, and anyone who quotes you a full re-roof without showing you why should make you suspicious. But some roofs really are done, and patching those is throwing good money after bad. This guide gives you the same test we use on a survey, so you can tell which side of the line your roof is on before anyone climbs a ladder.
The quick test
Three questions decide most cases:
- Is the problem in one place, or everywhere? One leak with one traceable cause points to repair. Trouble in different places, in different winters, points to a roof that is failing generally.
- How old is the roof? A twenty-year-old tiled roof with a fault is almost always worth repairing. A sixty-year-old roof with the same fault may not be, because the next fault is already on its way.
- What would the repairs add up to? Our rule of thumb: once the work needed approaches a quarter to a third of the cost of replacement, or it is the third call-out in a couple of years, the money belongs in a new roof.
If you answered "one place", "not that old" and "a few hundred pounds", relax: you almost certainly need a repair, and our repair service handles exactly that. The rest of this article is for the harder cases.
Signs a repair is the right call
- A handful of slipped, cracked or missing tiles, especially after a named storm. The fixings on those tiles failed; the roof did not.
- A leak you can trace to a junction: chimney flashing, a valley, a ridge line, around a roof window. Junctions are where most roofs leak, and junctions can be rebuilt individually.
- Mortar failing in one run: a stretch of ridge or verge losing its pointing can be re-bedded or, better, replaced with a dry-fix system without touching the rest of the roof.
- Roofline problems: rotten fascias, leaking gutters and overflowing joints damage walls, not roofs, and are fixed on their own.
- Moss. Moss alone is cosmetic on most modern tiles. It holds damp and can block gutters, so clearing it is worthwhile, but it is not a reason to replace a roof, whatever a knock-on-the-door salesman says.
What repairs cost in 2026
Guide prices for common repairs across the North East, so you know what reasonable looks like:
| Repair | Typical price |
|---|---|
| Slipped or replaced tiles (a handful) | £150 to £350 |
| Chimney or abutment flashing renewed | £350 to £900 |
| Valley rebuilt | £600 to £1,200 |
| Ridge re-fixed or converted to dry ridge | £600 to £1,500 |
| Chimney repointed and flaunching renewed | £400 to £1,200 |
Prices move with access more than anything: a repair that needs scaffold rather than towers or ladders can double. And as with quotes for full roofs, the cheapest repair quote is often the one that treats the symptom. Refixing a tile over a torn membrane stops the drip, not the leak.
Signs the roof is telling you it is finished
- Tiles slipping all over the roof, not in one patch. This is usually nail fatigue: the fixings holding every tile have corroded, and each repair is a preview of the next one.
- Daylight or drifting dust in the loft. Go up with a torch on a bright day. Pinpricks of light, or a layer of black grit on the insulation, mean the membrane under the tiles has gone brittle and torn. Tiles shed most of the water; the membrane catches the rest, and without it every windy downpour finds a way in.
- Tiles themselves breaking down: surfaces flaking off (spalling), corners going soft, slates delaminating in layers. The covering has reached the end of its life as a material.
- A different leak every winter. If you have paid for repairs in three separate places in a few years, the roof is failing generally and you are funding it on the instalment plan.
- A visible sag. A dip in the ridge or a slope means the timbers beneath are moving. This one goes beyond re-covering and needs looking at promptly.
The tipping point, with real numbers
Take a fifty-five-year-old three-bed semi with its original concrete tiles. This winter it needs a valley and a flashing: call it £1,400. The tiles are spalling, and last year it needed £400 of refixing after storms. A re-roof on that house is around £8,500 (the full breakdown is in our replacement cost guide).
The question is not "is £1,400 cheaper than £8,500?" Of course it is. The question is what the £1,400 buys. On this roof it buys two working junctions on a covering that is failing everywhere else, with more repairs certain to follow. Put against that, £8,500 buys fifty years of roof at about £170 a year. The repair money is not saved, it is spent waiting.
Now change one fact: the same house, but the roof is twenty-five years old and the tiles are sound. Same £1,400 of work. Repair it without a second thought: that roof has decades left, and replacing it would be the wasteful choice. Age and general condition decide, not the size of this year's bill.
How to protect yourself from being sold a roof you do not need
Some outfits quote a re-roof for every leak, because it is the biggest ticket. Others patch anything, because it is the quickest cash. Both cost homeowners a fortune. Whoever surveys your roof, ask for three things:
- Photographs of the actual fault. Not stock photos, not gestures at the roof from the drive: pictures of your tiles, your flashing, your membrane. If they cannot show you the problem, they have not found it.
- The repair option, priced. Even when replacement is the honest recommendation, a straight answer to "what would it cost to just repair it, and what would that not fix?" tells you whether you are being surveyed or sold to.
- The reason in writing. "Roof needs replacing" is a sales line. "Nail fatigue across both slopes, membrane perished, photos attached" is a diagnosis.
We put every survey in writing with photographs, whichever answer it comes to. A good share of ours end in a repair, which is exactly how it should be for a company doing honest surveys: the reviews are full of small jobs as well as big ones.
Not sure which side of the line you're on?
That is what the free survey is for. The owner comes out, gets on the roof, and tells you what it actually needs, with photographs either way. If it is a £250 repair, that is what you will be quoted, and if the roof is genuinely done, you will see exactly why.
Repair or replace questions we hear most
Can you repair just one side of a roof?
Yes, and on a semi or terrace it is common: one slope takes the weather far harder than the other. The honest caveat is appearance. New tiles next to forty-year-old ones will not match, and nothing weathers them faster. It looks fine from the street on most houses, but if the roof faces the road and appearance matters to you, factor that in.
Will home insurance pay for my roof?
Policies differ, but the general pattern is this: sudden storm damage is often covered, and gradual wear and tear never is. A roof that failed because it was old is maintenance, not an insurable event. If a storm has genuinely damaged your roof, photograph everything before any work is done and speak to your insurer first. We can provide a written report of what we find, which most insurers ask for.
How long should a repair last?
A proper repair on a roof that is otherwise sound should see out the rest of the roof, because it fixes the fault, not just the symptom. Refixed tiles, renewed flashings and a rebuilt valley are permanent work. What does not last is patching a roof that is failing generally: the repair holds, and the roof fails six feet away the following winter.
Is it worth patching an old flat roof?
Occasionally, to buy a season while you plan the proper job. But an aged felt roof that has started leaking is usually leaking in more places than it shows, because water travels under the covering before it appears inside. A patch on one blister rarely stops the second one. A full recover in EPDM rubber usually works out cheaper than three years of patches.
Do you charge to come and diagnose the problem?
No. Surveys are free, the owner does them personally, and you get a written answer with photographs of what we found, whether that answer is a £250 repair or a re-roof. We would rather tell you the boring truth than win a job on a dramatic diagnosis.