The test is how many repairs the same slope has needed. A single leak at one stack is a repair. Three leaks in two winters, from slates sliding in different places, is a roof telling you something bigger.
Q2.1When is a repair enough?
Refixing slipped slates, renewing a section of lead flashing, re-bedding a few ridge tiles: these are repairs that properly solve a fault, and we recommend nothing larger when that is what the survey finds. MyBuilder's roof repair guide, updated August 2026, puts minor repairs at £100 to £300 and moderate ones at £500 to £1,000 as typical national figures. Your written quote reflects your own roof and its access.
Q2.2When does a slope need more than a repair?
If nails are failing right across a slope, the sounder route is to strip that slope, renew the battens and underlay, and re-lay the good slates with new ones to make up the numbers. Doing that once costs less over ten years than patching four times, and the slope is then dependable.
Q2.3Why does scaffold decide so much?
On a terraced street, access is a large part of the price. Scaffolding goes up for a re-roof, and one visit with scaffold can include repairs that would otherwise need a second set-up. When we survey, we note anything that would be better done while the scaffold is there, then leave the choice with you.
Our roof repairs page covers the repairs we carry out most often on older houses.