Who Is Responsible for a Leak in a Leasehold Flat?

Who is responsible for a leak in a leasehold flat?

The leaseholder is responsible for repairing a leak on pipework and appliances inside the demised flat that serve only that flat. The freeholder, or the management company acting for them, is responsible for the structure, the roof, the common parts, and the shared pipework such as risers, stacks and communal tanks. The lease is the contract that decides it, and there is no universal rule that overrides what your lease actually says.

Three clauses in the lease settle almost every dispute. The demise clause says what you bought, usually described as the flat itself and often expressed as everything from the internal plaster surfaces inwards. The repairing covenants say who must repair what, and they normally split into a leaseholder covenant for the interior and a landlord covenant for the structure and common services, with the cost of the landlord side recovered through the service charge. The insurance clause says who insures the building, which in a block is nearly always the freeholder, funded by you.

Read those three clauses before you read anything else, including any advice you find online. Leases in converted Victorian houses are frequently drafted differently from leases in purpose built blocks, and two flats in the same building can hold leases granted decades apart with genuinely different wording. If the demise of your flat includes the floorboards but not the joists, that single line decides who owns the pipe running between them.

• The demise clause: what physically belongs to your flat
• The leaseholder repairing covenant: what you must maintain and repair
• The landlord repairing covenant: structure, common parts, shared services
• The insurance clause: who insures, what is insured, and who pays the premium
• Any covenant about permitting water to escape or causing nuisance to other flats

Where the lease draws the line between your pipes and the building pipes

The test in most leases is the word exclusively. A pipe that lies within your flat and serves only your flat is yours to repair. A pipe that passes through your flat on its way to somewhere else, or that serves more than one flat, belongs to the building even though it sits behind your wall. The branch running from the riser to your basin is yours. The riser itself is not.

That distinction produces some results people find surprising. The soil stack boxed into the corner of a converted bathroom usually belongs to the building, because every flat above discharges into it, so a weeping joint on that stack is a landlord repair even though the boxing is inside your flat and the water is running down your wall. A communal cold water storage tank in the loft feeding four flats is a landlord item. A shared heating main serving a block is a landlord item. Meanwhile the unvented cylinder in your hall cupboard, its expansion vessel, its safety valves and the discharge pipe running from it are almost always yours, and so is the boiler, the shower pump, the flexible tap connectors and every isolating valve inside the flat.

Thermal stores sit on the boundary. In a purpose built block with a Pulsacoil or similar unit inside each flat, the unit is usually the leaseholder responsibility while the heat main feeding it is not, and the changeover is typically an isolating valve in a cupboard. Find that valve before there is an emergency.

If the flat is let, there is a second line to draw inside the first one, because landlord or tenant responsibility for a repair is a different question from leaseholder or freeholder.

• Yours: basin, bath, shower and WC branch pipes and wastes inside the flat
• Yours: boiler, cylinder, thermal store unit, immersion heater, pump, valves and their discharge pipes
• Yours: appliance hoses on washing machines and dishwashers, and the sealant around baths and trays
• The building: vertical risers, soil and vent stacks, communal tanks, shared heating and cold mains
• The building: roof, external walls, windows in most leases, and the structural floor slab

In converted houses the lease plan often dates from the original conversion and does not show where pipework was later moved. If the plan and the building disagree, what matters for the repair is what the pipe actually serves, not what a drawing from thirty years ago suggests.

The leak came from the flat above. Who pays for my damage?

The leaseholder above has to repair their own pipe, but they are not automatically liable for the damage to your flat. Under English law a neighbour pays for your damage where they have been negligent or have broken a term of their lease, not merely because the water originated on their side of the ceiling. A pipe that failed without warning inside a wall is usually nobody fault. A neighbour who watched a stain spread for a month, or who fitted a connection themselves and did not tighten it, is a different matter.

This is the single most misunderstood point in leasehold water damage, and it is worth being blunt about it. People arrive at the argument convinced that the source of the water settles the bill, and it does not. The questions that decide liability are whether the leaseholder above knew or should have known there was a problem, whether they acted once they knew, and whether anything they did or failed to do caused the failure. Leaving a bath running, ignoring a dripping waste, using a push fit fitting on a joint that was never accessible again, or running an appliance hose past its useful life all sit on the negligent side of that line.

Read the neighbour lease as well as your own. Many leases contain a covenant not to permit water to escape into another flat, or not to cause nuisance to other leaseholders, and where that wording exists a claim can be built on breach of covenant rather than on proving negligence. In practice most of these claims never reach a court, because the building insurance exists to absorb exactly this situation.

The immediate steps are the same as for any water escaping in the house, and the question of liability is settled afterwards rather than while the ceiling is still wet.

What the buildings insurance actually covers

Nearly every London block is insured under one buildings policy arranged by the freeholder and paid for by the leaseholders through the service charge. Escape of water is a standard insured peril on those policies, so the policy will normally pay to dry out and reinstate the damaged flat, including ceilings, plaster, decoration and flooring. It will not pay for the failed pipe or component itself, and the excess on escape of water claims is often the highest figure on the whole schedule.

Two features of these policies matter more than people realise. The first is trace and access cover, which pays for the work of opening up floors, walls and boxing to find the leak and then making good afterwards. Where that cover exists it is often the largest single part of the claim, because chasing a leak through a screed floor costs more than the fitting that failed. The second is that buildings insurance does not cover your contents, your furniture, your carpets in most wordings, or your own alternative accommodation. That is your contents policy, and it is the gap that catches most leaseholders out.

Leaseholders generally have a statutory right to ask for a summary of the insurance cover and to inspect the policy, so if the managing agent is vague about the terms, ask in writing for the policy schedule. You need three numbers from it before you decide anything: the escape of water excess, whether trace and access is included and up to what limit, and whether the excess is charged to the block or recharged to the flat where the leak started. That last point is where service charge arguments begin.

Where the leak is on a hot water system in a let flat, landlord hot water responsibilities set a floor that neither the lease nor the policy can lower.

Do not throw away the component that failed. A split flexible tap connector, a perished washing machine hose or a corroded olive is the evidence that decides both the insurance claim and any argument with the neighbour. Photograph it in place before it is removed, then bag it and keep it.

Where leaks in London flats actually come from

Most flat to flat water damage in London is not a burst pipe. It is a failed seal, a flexible connector, an appliance hose or a shower enclosure that has stopped being watertight, and the reason it matters is that the source changes who is responsible. A waste leak that only appears when the shower above runs is a leaseholder problem every time. Water tracking down a soil stack that serves the whole building is not.

The housing stock tells you where to look first. In Victorian conversions the recurring items are the soil stack junctions, old lead to copper joints left in place during the conversion, pipework chased into walls and plastered over, and bathrooms sitting directly above a neighbour bedroom with nothing but lath and plaster in between. In purpose built blocks the recurring items are risers in cupboards, thermal store units and their discharge arrangements, communal tanks, and shower trays bedded on timber that has moved. In new builds it is liquid screed poured over underfloor heating, manifold connections, and push fit joints buried under baths where nobody will ever see them weep.

Hard water runs across the whole supply area and it shapes the failures. Scale builds on immersion elements, inside heat exchangers and on valve seats, so an isolating valve that has sat untouched for ten years often weeps the moment somebody turns it to isolate a repair. That is a genuinely common sequence: a small job becomes a bigger one because the isolation itself fails. It is also why a plumber who turns up to a minor leak in a hard water flat will want to check the valves either side before promising a quick fix.

A burst pipe repair in a block is rarely only about the pipe, because the water has usually crossed a boundary before anybody noticed it.

• Flexible tap connectors, which fail without warning and flood fast
• Shower waste seals and the seal between tray and enclosure, which only leak while in use
• Washing machine and dishwasher hoses, and the appliance itself
• Soil and vent stack joints in converted houses, which are usually a landlord item
• Isolating valve olives and radiator valve glands disturbed after years of scale
• Discharge from an unvented cylinder safety valve, which is not a leak but a warning

Water travelling along a joist or a screed layer can appear several metres from where it started, and a ceiling stain directly under a bathroom does not prove the bathroom is the source. Never accept a diagnosis based on the position of the stain alone.

What to put in writing, and who to send it to

Report a leak in writing on the day you find it, to three parties: the managing agent or freeholder, the leaseholder of the flat you believe it is coming from, and your own insurer. Say when it started, what you can see, what is wet, what you have already done to stop it, and ask for a written acknowledgement. A dated email takes two minutes and decides who carries the loss if the matter drags on.

The wording matters less than the specifics. State facts you can prove and leave out conclusions you cannot. Write that water appeared on the ceiling of the second bedroom on a stated date, that it worsens in the evening, that the ceiling is soft over an area you have measured, and that you have photographs. Do not write that the neighbour has been negligent, because at that stage you do not know and the accusation makes the access you need harder to get. Most leases require the leaseholder to notify the landlord of damage, and prompt written notice also protects you if the insurer later asks why the claim was made weeks after the event.

Access is the practical obstacle and the lease is the answer to it. Long leases almost always give the landlord a right to enter a flat on notice to inspect and repair, and they usually allow the landlord to require one leaseholder to give access where work is needed to protect another flat. That is why the request goes to the managing agent rather than being argued neighbour to neighbour. If the flat above is tenanted, the letting agent and the landlord both need to be told, because a tenant cannot authorise structural investigation.

• Date the leak was first seen and whether it is continuous or intermittent
• Which rooms and which surfaces are affected, with measurements and photographs
• What you have already done, including turning off a supply or catching water
• A clear request for an engineer to attend and for the neighbour to check their flat
• A request for the insurance policy schedule and the escape of water excess
• A request for written confirmation of who the managing agent considers responsible

How an engineer proves where the leak is coming from

An engineer works backwards from the water rather than guessing at the source. The area is dried so that new water can be seen, circuits are isolated one at a time, and each possible source is tested in turn until one of them reproduces the leak. Moisture meters and thermal imaging narrow the search area, a pressure test on an isolated section proves whether a supply pipe is holding, and tracer gas finds buried pipework under screed without opening the whole floor.

The single most useful test in a flat to flat leak costs nothing. Tape the shower waste, run the shower for ten minutes and watch the ceiling below, then release the waste and watch again. If the water only arrives after the waste is released, the supply is fine and the waste or the tray seal has failed. That one sequence separates two entirely different repairs and two entirely different bills, and it is worth doing before anyone opens a ceiling.

Insist on a written report at the end, whoever pays for the visit. A report that names what was tested, what was excluded and why, what failed, and what repair is needed is the document that settles the insurance claim and the argument with the neighbour. A report that says water ingress from above, cause unknown, settles nothing and will be sent back by the insurer. If the source turns out to be shared pipework, that same report is what forces the freeholder to act on their own repairing covenant.

Proving the source is leak detection and repair carried out in a particular order, because once two parties are arguing about who pays, the report matters as much as the fix does.

• Which supplies and wastes were isolated and tested, and the result of each
• Any pressure test, the pressure applied and how long it was held
• Photographs of the failed component in position before removal
• A clear statement of which flat or which shared service the water came from
• What has been repaired, what is temporary, and what still needs doing

What to do if the freeholder or the flat above will not act

Escalate in order and keep every step in writing. Start with a formal complaint to the managing agent under their own complaints procedure, then take it to the redress scheme the agent is required to belong to, then to the First tier Tribunal, which deals with service charge disputes and with questions about whether the landlord is meeting their obligations. In serious and persistent cases a group of leaseholders can apply to have a manager appointed in place of the existing one.

If the leak is on shared pipework and the freeholder does nothing, that is a breach of their repairing covenant and the loss it causes is recoverable from them. Say so, in those terms, in writing. Managing agents move considerably faster once a leaseholder identifies the specific covenant being breached rather than simply complaining that nothing is happening. If the flat has become genuinely unfit to live in, the local authority environmental health team is a real route and one that landlords in the private rented sector in particular take seriously.

One thing to avoid: withholding service charge as a lever. It feels proportionate and it is legally risky, because arrears can be pursued separately from the disrepair and the lease usually allows forfeiture proceedings to be started over them. Challenge a service charge properly through the tribunal if it is unreasonable, and pursue the repair as a separate matter.

Can you just fix it yourself and claim the cost back?

You can stop a leak in your own flat at any time and you should, immediately. What you cannot safely assume is that money spent on pipework belonging to the building, or inside a neighbour flat, will be repaid. Doing work on shared services without the freeholder agreement can itself breach your lease, and recovering the cost afterwards is a narrow remedy with procedural requirements that must be followed exactly.

The sensible split is this. Deal with anything inside your own demise at once, because delay makes the damage worse and turns an insured accident into an argument about negligence. For anything outside it, contain the emergency, put it in writing to the agent the same day, and let the freeholder instruct the repair.

If the leak is active and water is running now, none of the ownership questions matter for the next hour. Isolate the supply, catch what you can, get the electricity off in the affected area if water is anywhere near light fittings or sockets, and call somebody out. The lease argument keeps until the morning. Water reaching two floors down does not.

Never leave a ceiling holding water. A bulging plasterboard ceiling can hold a surprising weight and then release it all at once. Put a container underneath, stand clear, and pierce it deliberately at the lowest point rather than waiting for it to fail on its own.