The short answer
A single slipped or cracked tile can take under an hour once the roofer is on the roof. Refixing a ridge, replacing a flashing or patching a flat roof usually takes a few hours to a day. Relining a valley or recovering a small flat roof can take a day or two. Weather, access and rot in the timbers beneath are what stretch a job, and the survey fixes the likely time.
Why one repair takes an hour and another takes two days
People ask how long a roof repair takes as if there were one answer. There is not, because roof repairs are a family of different jobs that happen to share a ladder. Replacing a tile means lifting the ones around it, sliding a new one in and securing it, and it is finished when the roofer comes down. Relining a valley means taking the tiles off both sides, stripping the old lining, fitting new lead or a GRP trough and putting the tiles back, and that is a job for a day or more.
What decides the time is the amount of the roof opened up, the work needed to make it safe and watertight again, and what is found when the old material comes off. We would rather say a job may overrun a little than promise a time that depends on conditions nobody can see from the ground.
Typical times by type of repair
The table gives a realistic idea of what each repair involves on a normal house. These are working times on site, not a promise, because weather and access can change them.
| Repair | Typical time on site |
|---|---|
| Replace a few slipped or cracked tiles or slates | An hour or two |
| Refix or re-bed a section of ridge or hip tiles | Half a day to a day |
| Replace a lead flashing or chimney back gutter | Half a day to a day |
| Reline a valley with lead or a GRP trough | One to two days |
| Patch or re-cover a small flat roof section | Half a day to two days |
Bigger jobs, such as stripping and re-covering a slope after the timbers turn out to be rotten, move out of repair and into a larger piece of work, which the survey flags before we start.
What makes a repair take longer
Access comes first. A ground-floor porch can be reached from a ladder in minutes. A chimney high on a terrace needs a scaffold that has to be put up and later taken down, which adds days around the work even when the repair is brief. Our page on roof work without scaffolding explains when a ladder or tower is enough.
The second is what lies underneath. Rotten battens, a cracked rafter or damp insulation can only be seen once the covering is lifted, and dealing with them takes time. A third is the material: natural slate and handmade clay tiles take longer to match and refit than modern concrete tiles, and lead has to be cut, dressed and fitted to the shape of the roof.
Drying matters for flat roofs. A felt or membrane needs a dry deck to bond to, and we do not lay it over a wet surface. Waiting for the deck to dry can add a day.
Matching adds time on older houses. A hand-made clay tile or a worn natural slate that must blend with its neighbours may have to be sourced, and the roofer may pick through reclaimed stock before finding a close colour and size. That is slower than reaching for a modern concrete tile, but it keeps the repair from standing out on the roof.
Weather and the season
Weather is the biggest outside factor. Roofers do not work on a wet roof, and wind makes handling sheets, tiles and ridge sections unsafe. A repair that would take a morning can slip to the next dry spell. Heavy rain and strong winds are the usual reasons for a rebooked day, and in winter the short daylight shortens the working window as well.
When a roof is actively leaking, we prioritise it and make it safe first, which might mean a temporary cover before the proper repair can be done in better weather. Our winter roof repairs page looks at what can and cannot be done in cold or wet conditions. A temporary fix is not the same as a repair, and it should be called what it is.
Before and after the repair itself
Hours on the roof are only one slice of the timeline. A survey with photographs comes first and the written quote follows. Once you accept, the date depends on the work and the weather. On the day we set up, repair, clear the site and take the waste away.
Afterwards the roof is watertight but the house may still be damp. Plaster stains fade slowly and wet insulation takes time to dry. That is normal, and our roof still leaking after repair page explains how to tell a drying house from a failed repair.
Getting an estimate for your roof
The surest way to learn how long your repair will take is to have the roof looked at. A photograph of a ceiling stain tells us a little. Photographs of the roof itself show how much must be opened up, which is the best predictor of time.
Finished repairs carry a written 10-year workmanship guarantee, and our roof repair guarantee page explains its limits. A time estimate for your roof starts with 01793 626096, a WhatsApp message or the enquiry form. The roof repairs hub lists the other questions we cover. Our page on signs a roof needs repair will help you decide when to call, and what damages roofs explains why the repairs happen in the first place.