The Boundary Between Us: Repair Duties in Flats, Maisonettes and Adjoining Homes

Why attachment changes the repair question

In a detached house, a crack in an internal wall is usually a straightforward maintenance issue. In a flat, maisonette or terraced property, the same crack may sit on a boundary between responsibilities. The repair itself might be simple; establishing who should commission and pay for it can be far less so.

This is not a reason to delay essential work. It is a reason to ask a few structured questions before a contractor is appointed. Whether you own a leasehold flat, own a freehold house that shares a wall with a neighbour, or rent from a landlord, the route to a repair depends on the legal and management arrangements behind the property. Getting that route right at the start is often the difference between a quick fix and a prolonged disagreement.

Start with the legal map, not the defect

Before discussing quotes, establish the property arrangements in writing. For a leasehold property, the lease is the primary document. It should set out what is included in the demise, what the landlord or freeholder is responsible for, what the leaseholder must maintain, and how service charges are applied to communal repairs.

For a freehold house, the title documents and any transfer or conveyance may contain covenants or easements affecting shared walls, access ways, drains or boundaries. These documents are not always light reading, but they answer a more useful question than a general online search: what does this particular property require?

Tenants should begin with the tenancy agreement and the landlord or managing agent. A tenant may report a defect, but the contractual duty to repair usually sits with the landlord or the party named in the agreement. It is sensible to report promptly in writing and to keep the response.

Leasehold, freehold and the limits of each label

The words leasehold and freehold are a starting point, not a complete answer. A leaseholder may be responsible for internal fixtures and finishes while the freeholder retains responsibility for the structure and common parts. A freeholder of an adjoining house may own their building outright but still share liability for a boundary wall or a private drain under the title documents.

In blocks of flats, the dividing line is often described through the lease and the service charge budget. Routine maintenance of corridors, stairwells, roofs and shared external walls is commonly arranged by the landlord or managing agent and funded through the service charge. Larger or unusual works may trigger formal consultation requirements. Leaseholders who receive notice of major works should read the paperwork carefully and seek advice if the scope or cost is unclear.

For freehold houses, disputes more often concern boundary features and shared access. A wall between two houses may be a party wall, a boundary wall, or entirely within one ownership, depending on the deeds and the physical construction. The label matters because it affects who may carry out work and who contributes to it.

Communal areas and shared services

Communal areas are rarely self-contained. A leak in a shared hallway may originate in a flat above; a blocked communal drain may be affected by waste from several properties. The managing agent should be the first point of contact where a communal service is involved, with the report made in writing and accompanied by photographs or a short video where safe to take one.

Shared drains need particular care. Some drains and sewers are private and are the responsibility of the properties they serve; others are public and may fall to the local water company. The position can depend on the layout and adoption status of the drainage. Before appointing a drainage contractor, ask the managing agent or water company to confirm the likely responsibility. This avoids paying for work that another party should authorise.

Party walls: works versus wear and tear

The Party Wall etc. Act 1996 provides a framework for certain works affecting party walls and excavations near neighbouring property. It is often associated with building projects rather than routine repairs, but the distinction is worth knowing. Replacing a cracked wall may be ordinary maintenance; altering or rebuilding a party wall can require notices and, in some cases, a party wall award.

Where a repair is urgent and affects safety, the priority is to make the property safe. Even then, keep a record of why urgent action was taken and notify the other affected parties as soon as practicable. A contractor should not be asked to decide a legal responsibility question; their role is to inspect, advise on the physical defect and carry out instructed work.

A pre-contract checklist for shared repairs

Before calling a contractor for a defect that may affect another property, work through the following:

• Identify the defect precisely: location, visible symptoms, when it started and whether it is worsening.
• Check the lease, title documents or tenancy agreement for repair responsibilities and any covenants.
• Confirm whether the affected area is inside the property, in a communal area or on a boundary.
• Ask the managing agent or landlord in writing who is responsible for the repair and who authorises access.
• For drains, establish whether the run is private or public before commissioning work.
• Obtain a written scope and quote that states what is included, what is excluded and what access is needed.
• Ask the contractor to note any shared or boundary elements in their report rather than making assumptions.
• Keep photographs, emails and a simple timeline of events.

Documenting without escalating

Disputes often grow from gaps in the record rather than from the defect itself. A short, factual email is more effective than a long argument. State what you have observed, what you have been told, what you are asking the other party to confirm and by when. Avoid attributing blame or withholding payments without advice.

Where a neighbour is affected, a joint inspection can be useful. It allows both parties to hear the same technical explanation and reduces the risk of conflicting contractor reports. If relations are strained, ask the managing agent or a solicitor to help frame the communication.

When to take professional advice

If the lease is ambiguous, the title documents are unclear, the proposed work is substantial, or another party denies responsibility, seek advice from a solicitor or a leasehold advisory service. A qualified contractor can explain the physical repair; they cannot determine legal liability. Keeping those roles separate protects both the property and the working relationship with neighbours.

Attached living requires a little more administration than a detached house, but it does not need to be confrontational. A clear legal map, a written report and an agreed route to authorisation will usually get the repair moving without turning a shared wall into a shared dispute.