A Leak From Your Flat Has Damaged the One Below: Who Pays, and What the Lease Decides

Why water coming from your flat does not settle it

The assumption that runs this dispute is that the flat the water came from pays for the flat it landed in. It is wrong, and it is worth dismantling first, because every practical decision that follows depends on it.

English law does not impose strict liability on a leaseholder for an escape of water from their flat. The nearest thing to a strict liability rule, the rule in Rylands v Fletcher, was considered by the House of Lords in Transco plc v Stockport Metropolitan Borough Council in 2003, in a case about a failed water pipe serving a block of flats. The Lords held that supplying water to a residential building through an ordinary pipe is not an extraordinary or unusual use of land, and that no liability arose under the rule even though the pipe had failed and caused substantial damage. The practical effect is that liability between neighbours in a block normally has to be established through negligence, through nuisance, or through a term of the lease.

That reframes the question entirely. The leaseholder below is not asking whether water came from above; that is usually obvious. They need to establish either that the leaseholder above did something careless, or that someone, the leaseholder above or the freeholder, was under a repairing covenant they failed to perform. Those are evidential questions, and they are answerable, but not by argument at the front door.

What is demised to your flat, and what is retained by the freeholder?

A residential lease divides the building into the demised premises, broadly the flat itself with a boundary the lease defines, and the retained parts, which the freeholder holds, maintains and insures. Pipework serving only one flat and lying within its demise is normally that leaseholder's; pipework in a riser, in the structure, or serving more than one flat is normally the freeholder's. Where the line actually falls is a question about the wording of your specific lease, not a general rule, and leases drafted decades apart on the same street routinely draw it differently.

Building element	Typically demised to the flat	Typically retained by the freeholder	Where the drafting is usually ambiguous
Internal plaster and finishes	Yes	No	Rarely
Floor screed and floor covering	Usually the covering and screed	The structural slab	The interface between screed and slab
Ceiling void between two flats	Sometimes to the flat above	Sometimes retained	Very often, and this is where most leaks happen
Branch pipework serving one flat only	Yes	No	Where the branch runs outside the flat
Riser and stack serving several flats	No	Yes	Where a stack passes through a demise
Communal cold water storage and boosting	No	Yes	Rarely

The ceiling and floor slab is where most leases go quiet

The horizontal plane between two flats is the single most contested boundary in leasehold leak disputes, and it is also where the pipework most commonly fails. A waste branch from a bath, a compression joint on a heating flow, a failed shower tray seal: all of these typically sit in the floor build up of the upper flat or the ceiling void of the lower one. Many older leases demise to the upper surface of the structural slab, which leaves the void ambiguous; some demise the whole of the floor and ceiling within the flat; a few say nothing useful at all.

Read the parcels clause and the defined terms before forming a view, and read the freeholder's repairing covenant alongside it. If the lease is genuinely ambiguous, that is a matter for a property solicitor, and it is a much cheaper question to answer at the start than after two parties have spent money on remedial works.

Is your neighbour liable: negligence, nuisance, or a lease covenant?

There are three doors into liability, and they open on different facts.

Negligence

Negligence requires a failure to take reasonable care. Citizens Advice puts the everyday example plainly: if the leak was caused by your neighbour being careless, for example leaving the bath to overflow, it is their responsibility to pay for the damaged belongings. The same reasoning extends to a known defect left unrepaired, an appliance connected badly, or a property left unheated in a cold snap so that a pipe freezes and bursts. What it does not extend to is a sound pipe that fails without warning.

Nuisance

Nuisance is concerned with unreasonable interference with the use and enjoyment of neighbouring land. A single accidental escape rarely establishes it. Repeated leaks from the same source, particularly where the leaseholder has been told and has done nothing, are a different matter, and that pattern is where a nuisance claim usually starts.

Breach of a lease covenant

Most leases contain a covenant by each leaseholder to keep the demised premises in repair, and often a further covenant not to do anything that causes damage or nuisance to other occupiers. A failure to repair pipework inside the demise can be a breach of covenant even where negligence would be hard to prove, and the freeholder, not just the affected neighbour, may have standing to enforce it. Where the failure is in the retained parts, the freeholder's own repairing covenant is the one in play.

Source of the leak	Who repairs the pipe	Who pays for damage to the flat below	Who normally bears the excess
Careless act in the upper flat, for example an overflowing bath	Upper leaseholder	Upper leaseholder, and their contents or liability insurer	Upper leaseholder
Sudden failure of a sound pipe inside the upper demise	Upper leaseholder	Usually the block buildings policy for the fabric	Depends on the lease and the policy
Known defect in the upper flat left unrepaired after notice	Upper leaseholder	Upper leaseholder, on negligence or breach of covenant	Upper leaseholder
Failure in a riser, stack or other retained part	Freeholder or management company	Block buildings policy	Often the service charge, if the lease allows
Structural defect, for example a failed roof or balcony detail	Freeholder	Block buildings policy, subject to the cause	Often the service charge

How the block buildings policy actually responds

In almost every leasehold block the freeholder insures the whole structure under one buildings policy and recovers the premium through the service charge. That policy, not the leaseholder above, is usually what pays to reinstate the fabric of the damaged flat: the plaster, the ceiling, the decorations and often the fitted kitchen or bathroom, depending on how the lease defines the demise and how the policy defines the insured property.

Two limits matter. First, insurers generally respond to a sudden escape of water and not to gradual deterioration or want of maintenance. The Financial Ombudsman Service publishes guidance on how it approaches gradual damage exclusions, and its position is that where damage did happen gradually it may still require the insurer to pay if the damage was caused by an insured event, the policyholder could not reasonably have been aware of it, and the claim was made as soon as they reasonably could have known. That is a fact-specific test, and the facts are established by a survey, not by assertion.

Second, contents are not covered. Furniture, carpets, electronics and personal possessions belong to the occupier's own contents policy or, where carelessness is established, to the person who caused the leak.

Trace and access under the block policy

Most buildings policies include a trace and access extension, which pays for the work of finding the leak and for making good the damage caused by opening up and putting back. It generally does not pay for the failed pipe itself. Before instructing anyone privately, ask the managing agent whether the block policy carries that extension and what its limit is, because a survey funded under the policy costs the leaseholders nothing beyond the excess and produces a report the insurer has already accepted the basis of. Our overview of trace and access surveys sets out what that work involves and what the resulting report should contain.

Who pays the insurance excess?

This is the question that generates most of the ill feeling, because the excess on escape of water in a block is often substantial and the sum is real money to an individual leaseholder.

The Leasehold Advisory Service, the government funded body for leasehold questions, sets out the two routes it can take. The excess may be recoverable from the person responsible for the leak, where responsibility is established; or it may be spread across the leaseholders through the service charge. Which applies depends on whether the claim is treated as fault based and on what the lease says about how insurance costs and excesses are dealt with.

• Where fault is established, the party at fault is usually expected to meet the excess, and a freeholder who pays it may seek to recover it.
• Where no fault is established and the lease permits it, the excess typically falls into the service charge and is shared.
• Where the lease is silent, the outcome turns on construction of the lease, which is a legal question rather than a managerial one.
• If you consider a service charge including an excess is not reasonably incurred, the forum for challenging it is the First-tier Tribunal (Property Chamber), not the county court.

The practical point is that the excess follows the finding on cause. Which is why the survey, and not the correspondence, decides it.

The notification sequence in the first 48 hours

Order matters here, and the order most people use is the wrong one. Confronting the neighbour first produces a defensive position that then has to be dismantled with evidence. Notifying in writing first produces a record that makes the evidence easier to obtain.

Order	Who to tell	What to say	Why it matters
1	The flat the water appears to come from	Ask them to stop use and isolate, in writing as well as verbally	Stops the loss and fixes the date they were on notice
2	The managing agent or freeholder	Report the escape, ask whether the block policy trace and access extension applies	May fund the survey and starts the claim clock
3	The buildings insurer, through the agent	Notify, even if you are not yet claiming	Late notification is a common reason claims are queried
4	Your own contents insurer	Notify and photograph possessions before moving them	Contents are not on the block policy
5	A leak detection surveyor	Instruct for cause and origin, not just for a location	Cause decides cover and liability; location alone decides neither

Photograph and date everything at the point of discovery, including the ceiling, the water on the floor, any visible staining and the meter reading. If the water is live and running, isolate first and photograph second; safety and further damage outrank evidence gathering, and our guidance on water leaking through a ceiling covers the immediate electrical and structural precautions.

What if the neighbour will not let anyone in to find it?

Refused access is the single most common reason these disputes run for months, and it is the point at which most published advice stops being useful. There are three practical routes and they are worth trying in this order.

The first is the lease itself. Most leases contain a mutual access covenant obliging a leaseholder to permit entry, on notice, for the purpose of inspecting or repairing pipework serving other parts of the building, and a freeholder's right of entry for the same purpose. Ask the managing agent to invoke it in writing, quoting the clause. That converts a neighbourly request into a contractual obligation and very often ends the problem.

The second is to narrow the source from your own side. A good deal can be established without ever entering the flat above: a timed meter test on the common supply, isolation and pressure observation of the heating system, moisture mapping of the affected ceiling to establish the pattern and extent, and thermal imaging where a usable temperature difference exists. That work will not always name the failed component, but it will frequently exclude the possibilities that matter, for example by showing that the mains supply is static and the loss is on a heating circuit. Exclusions narrow the argument considerably. Our guide to running a trace and access claim step by step explains what those eliminations look like in a document an insurer will act on.

The third is legal. Where access is refused and damage continues, an injunction to permit entry is available, and the threat of one, properly advised, usually removes the need for it. That is a point to instruct a property solicitor rather than to improvise.

When to escalate, and where to

This article explains how liability is structured. It is not legal advice, and leasehold questions turn on the wording of individual documents to a degree that makes general rules unreliable. Three escalation routes are worth knowing.

• The Leasehold Advisory Service provides free government funded initial guidance on leasehold rights and obligations, including insurance and repair disputes.
• The First-tier Tribunal (Property Chamber) determines whether a service charge is payable and reasonable, which is the route where an excess or a repair cost has been passed through the service charge and you disagree.
• A property solicitor is the right step for construction of an ambiguous lease, for enforcement of a repairing or access covenant, and for any claim in negligence or nuisance against a neighbour.

Where the block is managed by a social landlord or a managing agent belonging to a redress scheme, a formal complaint through that scheme is usually a required step before escalation, and it is worth starting it early rather than late. In every one of these routes, the document that carries the most weight is a dated survey that states origin as a location and cause as a mechanism. Whether that is funded by the block policy or privately, commission it before the argument hardens, not after. If you are dealing with a tenanted property rather than a leasehold dispute, the statutory position is different and is covered in our guide for landlords and tenants dealing with leaks in a rented home.