The short answer
You can replace the roof on your own garage in a block, but the job has to be planned as part of a row. Work out who owns what, agree access and scaffold with neighbours, and detail the joints where your section meets the next. If the sheets are asbestos cement, they must not be broken, so each section is handled carefully.
Finding out which part of the row is yours
Before anyone prices anything, find out what you own. A block of garages may be sold off individually, each with its own title, or held by a management company or the freeholder of nearby flats. The deeds and your solicitor's papers will usually say who is responsible for the roof, the shared walls and the gutters.
In some blocks the roof is one continuous covering over the whole row, with only the dividing walls below to show where one garage ends and the next begins. In others, each garage has its own lean or flat roof set between party walls. We look at the roof from above at the survey, because the plan on paper may not match what was built.
If the answer is unclear, ask the neighbours, the freeholder or the managing agent. A short written note agreeing who does what will save disagreements later. Questions of ownership or liability are for your solicitor, not for us.
Coordinating access, scaffold and timing with neighbours
Garage blocks are often at the end of a lane or behind a terrace, with narrow access and cars parked in front. Working on one section may need the neighbours to move vehicles, open their doors, or let us use their roof edge for a short while. Asking early and in writing, with a date, makes that easy.
Scaffold is the biggest shared decision. For one garage a tower or a few ladders and edge protection may be enough, but on a long row a proper scaffold is safer, and neighbours who want work done can share the cost. Scaffold is priced on its own in our quote, which makes splitting it simple arithmetic rather than argument.
If all the garages are due work, doing them in one visit is cheaper and gives a neater result than several separate visits. In MyBuilder's 2026 garage roof guide, a flat roof on one garage is £700 to £1,000 and on two garages £900 to £1,400. Our guide to garage roof replacement costs sets out the other ranges and what drives them.
Detailing the joints between your section and the next
The weakest points on a shared roof are the joints. Where your covering meets a neighbour's, there will be a flashing, a coping or a sealed lap, and if the roofs are at different heights, a step flashing that follows the change of level. If you replace your section but leave a neighbour's old roof beside it, the new work must still tie in neatly to the old.
With felt or EPDM, the membrane climbs the wall at the junction under a flashing, often lead. With sheet roofs, the last sheet laps over the neighbour's and is sealed so water is shed away from the joint. A party wall that stands proud of the roof is usually capped, and the cap needs to be sound before the new roof is joined to it.
Gutters need thought as well. A shared gutter that runs across several garages may serve all of them, so replacing it on your section alone can leave the run uneven. System makers usually specify a slight slope toward the outlet, roughly 1:600 to 1:350, and we check the whole length of the run, not only the part above your door.
When the block is roofed in asbestos cement sheet
Many older garage blocks were built with corrugated asbestos cement across the whole row. If yours may be one, the usual caution applies: do not drill, break or scrape it. HSE guidance treats the careful removal of intact asbestos cement sheets, weathered ones included, as non-licensed work. Heavily broken sheets turn it into notifiable non-licensed work, which has to be reported before it begins.
On a shared roof the practical problem is that sheets overlap. Taking away one garage's section may mean lifting sheets that lap over a neighbour's, and a cracked sheet at the boundary could affect both owners. We plan the sequence so that the lapped sheets are released carefully and the edge is made weathertight on the day.
Our answers on spotting an asbestos garage roof and whether a licence is needed explain testing and the HSE position, and MyBuilder's 2026 guide gives single-garage removal at £350 to £1,295.
Doing your section alone, or the whole row together
You can replace only your section if it is a separate roof, and many owners do. The risk is a mismatch: new covering beside old, different heights at the joint, and a neighbour whose leak runs into your wall. A conversation with the neighbours before you start costs nothing and may lead to a shared job.
If neighbours agree to work together, one written quote can cover the strip, new covering, flashings and scaffold across the block, with each garage's share agreed between owners. Our surveyor photographs your roof, and the written quote follows from that visit. Each owner pays for their own section, and shared items such as scaffold and the gutter run are divided as you agree.
If a neighbour will not take part, the work on your side should still be finished to a sound edge, with the joint sealed so that your new roof does not depend on theirs. Where the block is within a conservation area or the buildings are listed, check with Stroud District Council before ordering materials.
We give our workmanship a 10-year guarantee in writing, leave the plot tidy and take the waste away. For the wider picture on garages, our garage roof replacement page is the place to start.