Who is responsible for repairing a shared wall between townhouses?

It depends on the title. For a NSW Torrens terrace, each owner owns their side up to the boundary. Under a Queensland standard format plan, the two lot owners are responsible for their portions. In many strata and owners corporation schemes, the scheme manages walls that are common property. The plan shows which applies.

Can I cut a doorway or opening in a shared wall?

Not without checking first. The wall may be common property, may carry structural support easements, and may need building approval. In a scheme, structural changes usually need approval from the owners corporation or strata company. Ask the council or building surveyor, and the scheme if there is one.

Are townhouse shared walls soundproof?

No. The National Construction Code sets minimum standards for fire and sound in walls between attached houses, and meeting them reduces noise without removing it. Layout, floors, stairs and plumbing also carry sound. Ask what the wall is made of and visit at different times of day.

Do I need my neighbour's permission to renovate?

Sometimes. The City of Sydney encourages party wall consent but does not formally require it for development applications unless works straddle the boundary. In Victoria, protection work notices go to the adjoining owner, who has 14 days to respond. Councils and surveyors set their own conditions.

What happens if my neighbour damages the shared wall?

It depends on the title and the damage. Torrens owners with easements have rights to the support of the wall, and in a scheme the owners corporation may handle common property. A solicitor, the council or the relevant state consumer agency can explain the options. Insurance policies may also respond, so read the wording.

Who owns and maintains a shared wall between townhouses?

Who owns the wall between two townhouses depends on the title and the registered plan, not on the wall itself. For a Torrens (individual title) terrace in NSW, the City of Sydney says each owner owns their side of a party wall up to the boundary, with cross easements protecting both. Under a Queensland standard format plan, the boundary usually runs down the centre of the wall. In many strata and owners corporation schemes, the wall can be common property instead. The sources below were checked in October 2026.

The same-looking wall can belong to one owner, to two owners or to the scheme, depending on how the plan was drawn. The title and plan answer the question, not a rule of thumb.

Checked October 2026. Rules, rates and prices change, so confirm anything that matters with the source linked below.

What a party wall is

The City of Sydney describes a party wall as a common wall that straddles two parcels of land, with the boundary passing vertically and lengthways through it. These walls typically divide terrace houses. Each owner owns their side of the wall up to the boundary, and cross easements entitle the owners on each side to the ongoing structural stability of the wall. An easement does not make its holder the owner of the other side.

NSW Land Registry Services says the cross easements arise where the words "party wall" appear on the registered plan, and it refers to sections 181B and 88BB of the Conveyancing Act 1919 for how they are created. It also says demolishing the wall physically ends the party wall relationship. This guide could only verify the NSW party wall easement framework, and other states handle shared walls through their own title and strata rules.

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Who owns and maintains the wall, by title type

Title type	Where the boundary sits	Who looks after the wall
NSW Torrens with party wall easements	Passes through the wall	Each owner owns their side, with mutual support easements
Queensland standard format plan	Usually down the centre of the shared wall	The two lot owners are each responsible for their portion, and the body corporate generally is not
NSW strata plan	Generally at the inside faces of the walls around each lot	The wall is part of common property, which the scheme manages
Victorian owners corporation	Set by the plan of subdivision	Walls can be common property, and the lot owner needs authorisation to alter it
Western Australian strata	Set by the strata plan	External walls are listed as common property, and structural changes need strata company approval

Each row comes with a caveat. The NSW Land Registry Services guide says each strata plan should be read independently. Consumer Affairs Victoria defines common property as any part of the land, buildings and airspace that is not a lot on the plan of subdivision, and says a lot owner must not repair, alter or maintain common property unless the owners corporation expressly authorises it. Landgate says lot owners cannot make structural alterations to common property without strata company approval. Tasmania, South Australia, the ACT and the Northern Territory have their own rules, which this guide does not cover.

Fire and noise standards

The National Construction Code's 2022 Housing Provisions set the minimum rules for walls between attached houses (Class 1 buildings).

Fire (Part 9.3): a separating wall needs a fire-resistance level of at least 60/60/60, or masonry at least 90 millimetres thick. It starts at the footings or ground slab and extends to the underside of the roof covering if the covering is non-combustible, or at least 450 millimetres above it if combustible. Combustible elements generally cannot cross the wall, apart from small roof battens and sarking, and gaps must be packed with mineral fibre or similar material. Electrical cables and outlets may pass through only within specific limits.
Sound (Part 10.7): the part covers separating walls between Class 1 buildings, and the example constructions (such as masonry, concrete panels, autoclaved aerated concrete, and double-stud framed walls with insulation) target a sound rating of at least 50 on the Rw + Ctr scale. They require sealed junctions and offset electrical outlets. The Northern Territory has its own version of the part, and states and territories adopt and vary the code, so ask what applies where the townhouse is.

A wall that meets the code limits fire spread and noise but does not remove noise. Which rooms sit against it, and how the floors and stairs connect, also matter. See what to look for when visiting display homes for how to check these on site.

When someone builds or renovates

Work on or next to a shared wall touches the neighbour's property, and the rules depend on the state.

Victoria: protection work is work that guards an adjoining property from damage during building. The building surveyor decides whether it is needed, and the owner doing the building work must arrange and fund it. Adjoining owners have 14 days to respond to a protection work notice, and can appeal to the Building Appeals Board within 14 days if there is a dispute.
NSW (City of Sydney): for development applications, party wall consent from neighbours is encouraged but not formally required. Written landowner consent is required only if the development straddles the boundary. The City typically imposes conditions such as keeping works within the property boundary, dilapidation surveys and certification by a structural engineer.
Schemes: approval from the owners corporation, body corporate or strata company may be needed first, because the wall may be common property.

Cutting an opening in a shared wall or fixing heavy loads to it can raise structural, approval and consent questions. The council, the building surveyor or the scheme is the place to ask first.

What to check before buying

The title search, for easements and the words "party wall".
The registered plan, to see where the boundary sits.
The by-laws and any rules about alterations, if there is a scheme.
What the wall is made of, and whether the builder or seller can provide details.
Insurance. Moneysmart says to check with the body corporate whether it insures the building, and notes that you still need contents insurance. Where there is no scheme, the owner arranges building insurance and should read the policy wording for shared walls.

A conveyancer or solicitor can read the title and plan with you. The guide to Torrens and strata title explains the two systems, and townhouse vs terrace vs semi-detached explains how the types compare.

Common questions

Who is responsible for repairing a shared wall between townhouses?: It depends on the title. For a NSW Torrens terrace, each owner owns their side up to the boundary. Under a Queensland standard format plan, the two lot owners are responsible for their portions. In many strata and owners corporation schemes, the scheme manages walls that are common property. The plan shows which applies.
Can I cut a doorway or opening in a shared wall?: Not without checking first. The wall may be common property, may carry structural support easements, and may need building approval. In a scheme, structural changes usually need approval from the owners corporation or strata company. Ask the council or building surveyor, and the scheme if there is one.
Are townhouse shared walls soundproof?: No. The National Construction Code sets minimum standards for fire and sound in walls between attached houses, and meeting them reduces noise without removing it. Layout, floors, stairs and plumbing also carry sound. Ask what the wall is made of and visit at different times of day.
Do I need my neighbour's permission to renovate?: Sometimes. The City of Sydney encourages party wall consent but does not formally require it for development applications unless works straddle the boundary. In Victoria, protection work notices go to the adjoining owner, who has 14 days to respond. Councils and surveyors set their own conditions.
What happens if my neighbour damages the shared wall?: It depends on the title and the damage. Torrens owners with easements have rights to the support of the wall, and in a scheme the owners corporation may handle common property. A solicitor, the council or the relevant state consumer agency can explain the options. Insurance policies may also respond, so read the wording.

Keep reading

Sources

This is general information, not financial, tax or legal advice. Get advice that suits your situation before you buy.