A roof over several flats behaves like any other roof, but the decisions around it are different. The person with the stain on the bedroom ceiling is often not the person who can order the repair, and the people who share the bill may never see the roof at all. In Bath, where many large houses were converted into flats and a good number of buildings are listed, the roof can also be a structure that no single resident has ever stood on. This guide is written for a flat owner, a freeholder or a managing agent who needs a shared roof repaired. It covers who normally holds responsibility, how access and scaffolding are arranged, what a survey of a shared roof should record, how costs are usually divided, and how to handle an active leak while the paperwork catches up. It gives general information, not legal advice. Your lease is the document that settles who must do what.
Who is responsible for the roof
On a converted house or a purpose-built block, the roof is usually a shared part of the building and not part of any one flat. The freeholder, or a management company the flat owners belong to, normally holds the duty to keep it in repair, and the flat owners normally contribute through a service charge. That is the general pattern. The wording of each lease differs, so the lease is the place to look, and a solicitor is the right person to ask if two readings seem possible.
Two situations cause most of the confusion. In the first, the top-floor flat owner is the one who notices water, so they assume the roof is theirs to fix. Unless the lease says otherwise, it is typically not. They report it to whoever manages the building, and the manager instructs a roofer. In the second, a flat has its own flat roof, such as a rear extension or a bay, and the lease gives that single roof to that single flat. Here the owner can instruct the work directly, but may still need the freeholder's consent for anything that changes the appearance of the building.
On a shared building our first practical question is not what has failed but who has the authority to approve the fix. We ask for the name of the managing agent or the freeholder at the first call, and we are happy to write up our findings so that you can pass them on in a form a management company can act on. A report with dated photographs of the defect, the roof area it sits on and the likely cause moves a decision along faster than a phone call describing a damp patch.
If the building has no managing agent and the flat owners run it themselves, the same logic applies with one extra step: the owners agree among themselves who will instruct and who will pay first. Settling that before the roofer arrives saves a second visit.
Getting onto a shared roof
Access is the part of a shared-roof repair that most often delays the work. On a single house a roofer puts a ladder against the wall. On a converted building the same roof may be reached only through the top flat, a loft hatch on a communal landing, or a scaffold erected across land that belongs to someone else.
Three routes are common, and each has a different consequence for the job.
- Through a communal hatch or stair. Where the building has a roof hatch, a small repair may need no scaffold. We need the key, and someone from the management side to let us in.
- Through a flat. If the only way up is a loft hatch inside one flat, the occupier has to agree to the time and to tools and materials crossing their home. A note to the other residents beforehand helps.
- From outside, by scaffold or tower. A tall building, a steep slope or a roof behind a parapet usually needs a scaffold. Its position can depend on a pavement, a neighbour's garden or a shared drive, and some of those need a licence or permission from the owner of the land.
For a full roof replacement, scaffolding is reported at about £1,125 in MyBuilder's 2026 cost guide, and the figure for a repair varies with the height and the number of elevations. After the survey you receive a figure to approve, with scaffold shown as its own line so the owners can see what it adds. Where several repairs are needed in the same year, it is worth agreeing them together, since one scaffold then serves them all.
Safety matters more on shared buildings because other people are below. We keep a clear zone beneath the work, and we agree a time for noisy work with the residents when the work will be done over occupied rooms. Neighbours are often glad to know the plan, and the work goes more smoothly when they do.
What a survey of a shared roof should record
A survey for a single house answers one question: what is wrong with this roof. A survey for a building with several owners has to answer a second one: can this report be put in front of all of them. That changes what we record.
The report should identify each part of the roof by where it is, so that the managing agent and the residents can follow it. On a converted Georgian or Victorian house that means naming the main pitches, any flat roof sections, the chimney stacks, the valleys (lead-lined troughs at the inward corner of two roof planes), and any parapet gutter. A parapet gutter is a leaded channel hidden behind the stone wall that stands above the eaves. It is lined with lead and carries the rainwater of a whole slope towards a downpipe, so on a converted terrace it often drains a long run of roof. A box gutter is a hidden trough built into the roof itself, sitting between two pitches or tight against a wall. On a shared roof we start with those hidden gutters, because a split in one can send water into several flats at once, and the stain can show up well away from the actual defect.
We photograph the defects on your own roof and mark them on the report, along with the condition of the parts around them, such as flashings (lead or similar metal shaped over a joint so rain cannot get in) and the fixings of the ridge. The report then separates the urgent work from the items that can wait, each with a written fixed price. That layout lets a management company approve the urgent repair quickly and plan the rest.
Where the leak shows in one flat, we also look at the other flats' ceilings with permission, because a defect that has been running for a while rarely stays in one place. The aim is to leave the owners with a document that says what was found, where, why and what it costs to put right, so that nobody has to argue from memory afterwards.
How the cost is usually shared
The cost of repairing a shared roof is normally spread across the flat owners through the service charge or a separate contribution, in the proportions the leases set out. We do not decide those shares and we do not see your leases, so our quote is for the whole job, with the items separated so that the managing agent can apply whatever split applies.
It helps to know what moves the figure, since owners are often asked to approve it before the work starts. MyBuilder's 2026 repair guide reports small leaks and a few tiles at £100 to £300 as a typical UK range, moderate work in the middle band up to £1,000, and major work at £2,500 and above. Those are ranges for houses. On a block, the drivers that stack on top are the same ones as anywhere else, only larger: the extent of the damage, the access and scaffold, the materials required to match what is already there, and how urgent the work is.
Matching matters as much on a shared building as on a house. A converted Bath terrace roofed in natural slate should be repaired in natural slate, and if a flat owner or a landlord chooses a cheaper substitute for one patch, the whole building shows it. Repair comes first where it will hold, and replacement slates or tiles are chosen to match the existing covering, which tends to protect the value of every flat in the building and not only the top one.
The written price arrives after the survey. Ask for it itemised, and ask for the scaffold, the lead, the covering and any structural timber to be listed separately. If the owners need to approve the spending, an itemised quote lets them agree the urgent part first. Where work is large enough to affect a good share of the roof, Building Regulations can apply, and we explain the position on the quote and handle the notification where it is needed.
Dealing with an active leak while owners decide
Meetings, consent and quotes take time, and water does not wait for them. When a flat has an active leak, there are two separate jobs: keeping the water out now, and agreeing the permanent repair.
We give priority to leaks and storm damage, and a leaking roof gets made safe on the first visit. That might mean a temporary cover, a patch to a failed section of lead, or the clearing of a blocked outlet that is sending water the wrong way. Our roof repairs service covers the permanent fix, and the page on temporary roof repairs explains what a stop-gap can and cannot do. A temporary repair is not a permanent answer, and on a shared roof it needs to be recorded as one, so that it does not sit unnoticed for years.
In the meantime, the affected flat owner can do some simple things. Move furniture, protect electrics and place a bucket. Photograph the stain and note the date. Tell the managing agent in writing, and ask the neighbours below or beside whether they have seen water. Early notes help a later insurance claim, and the building's insurer is usually arranged by the freeholder or the management company, so it is worth asking them whether a claim is appropriate. Insurers often exclude wear and tear, and photographs and a roofer's report help in either case.
The best outcome is a small first visit, a clear report, a quick approval and a proper repair before the next heavy rain. We write our findings so that the approval can be given from the report alone, without a second meeting on the roof.
Converted buildings in Bath: listing, lead and birds
Bath adds some factors that a general guide to flats would miss. UNESCO treats Bath as a single World Heritage Site. The conservation area is smaller, taking in roughly half the city, and Bath has about 5,000 listed buildings. If yours is one, a repair that alters the look of the roof can need consent under the listed building rules, which B&NES Council administers, and it is worth talking to the planning team before the work starts. Repair in the original material is a different question from replacing it with something modern. Where you cannot tell which applies, the B&NES listed buildings page is the place to start.
Many converted buildings also carry the older details that cause the trouble: lead parapet gutters, lead-lined valleys, stone chimney stacks and slate or stone slopes. Each is better repaired than covered over. Relining a parapet gutter, for example, is slow work that needs the right lead and the right falls, and it is far cheaper to do it once than to patch a split every winter.
Birds are the other recurring problem on shared roofs. Gulls and pigeons nest where a flat owner never goes, and their nests and droppings block outlets and gutters that serve the whole building. Our guide to bird spikes on a roof sets out how deterrents work on a ledge or a parapet. Both bats and nesting birds are protected, which shapes how and when we work near them.
The thread through all of this is record keeping. A shared roof is repaired over many years, by different people, paid for by different owners. The guarantee we give in writing for ten years of workmanship, with the survey photographs, leaves the building a dated record of what was done. The next person who manages the block will be glad of it.
If cold weather is the reason for the delay, our guide to winter roof repairs explains which jobs can go ahead in the cold and which are made safe until spring.