Duplex strata insurance: does a two-lot scheme need it?

A duplex on a strata plan is a strata scheme with two lots, and in most cases it needs strata insurance: one policy, in the name of the owners corporation or body corporate, covering both homes. The main exceptions depend on the state and on whether the two homes share a wall.

Two owners often assume they can each insure "their half". Where the homes are attached it is rarely that simple, because neither owner owns the whole building and the shared parts belong to both. This guide sets out what the governments of New South Wales, Queensland and Victoria say about two-lot schemes, and what a strata policy covers for a duplex.

Is a duplex a strata scheme?

Only if it sits on a strata plan (a community titles scheme in Queensland, a plan of subdivision with an owners corporation in Victoria). A duplex where each home has its own Torrens title has no owners corporation, and each owner insures their own home. The title search or the contract of sale says which it is.

A strata duplex has an owners corporation even if it has never held a meeting. The two owners are its only members.

Does a duplex need strata insurance?

It depends on the state, and mostly on whether the two homes are attached.

New South Wales

The NSW Government says strata insurance is mandatory, including building insurance and public liability of at least $20 million. A two-lot scheme may not need strata building insurance only if all three of these apply:

"the buildings in the two lots are physically detached", "no buildings or parts of a building are located outside the two lots (for example, on common property)", and "the owners corporation passes a unanimous vote that they don't need to get building insurance."

NSW Government, Managing strata finances and insurance (nsw.gov.au)

An attached duplex shares a wall, so it does not meet the first condition. Owners who do opt out may each take individual building insurance instead. The exception is for building insurance only, as our guide to strata insurance in NSW explains.

Queensland

In Queensland it turns on the survey plan. The body corporate must hold building insurance for schemes subdivided by a building format plan, and for schemes on a standard format plan that "contain a wall that is shared by two or more lots". For a standard format plan where a home shares no wall:

"an owner is responsible for insuring their own building if it does not share a common wall with another building. However, the body corporate can take out building insurance on behalf of owners under a voluntary shared insurance scheme."

Queensland Government, BCCM Fact Sheet: Insurance obligations (March 2025)

Every body corporate must also hold public risk insurance of at least $10 million for the common property, and a building it must insure needs an independent valuation at least every 5 years. Titles Queensland holds the plan that shows which format a scheme is. Our guide to body corporate insurance in Queensland has the full rules, including who pays the excess.

Victoria

Victoria treats a two-lot subdivision differently from larger owners corporations. Consumer Affairs Victoria says that an owners corporation for a two-lot subdivision "does not have to take out public liability and reinstatement and replacement insurance for the common property". It also points out that the owners still carry the legal and financial risk of anything that happens on shared property.

So in Victoria the law does not make the two owners of a duplex hold one policy together. Where there is shared property, such as a driveway, it is worth knowing whose policy, if any, covers it. Larger schemes are covered in our guide to owners corporation insurance in Victoria.

Other states and territories

In Western Australia, owners in a single tier scheme (no lot above or below another) insure their own lots unless the strata company resolves otherwise. In South Australia, a strata corporation must insure all buildings on the site and unit holders cannot insure separately instead. Tasmania, the ACT and the Northern Territory have their own rules, set out on their governments' strata pages.

Can each owner just insure their own half?

Where the law requires the owners corporation to insure the building, two separate home policies do not meet that requirement. There are practical problems as well:

• Shared parts. The party wall, a common roof, shared pipes and the driveway belong to the owners corporation, not to either owner.
• Two insurers, one event. A fire that starts in one home and damages both becomes two claims with two insurers and two views of who pays for the shared wall.
• One owner uninsured. If the neighbour lets their policy lapse, the shared structure is only partly insured.

One strata policy insures the whole building for its rebuilding cost, with both owners named through the owners corporation.

What does strata insurance cover for a duplex?

The same things it covers for a larger building. In the Strata Community Insurance policy that prices quotes on this site (SCI-PPW-04/2026), the building includes fences, gates, paths and roadways, retaining walls and in-ground pools as well as the two homes (page 21), and the liability section covers the owners corporation's legal liability for injury or property damage (page 7).

It does not cover either owner's contents, or carpets and floating floors inside a lot (pages 22 to 23). Our guide to what strata insurance covers goes through the policy section by section, including water damage and what is excluded.

How much is strata insurance for a duplex?

For two Sydney duplexes we priced on 11 November 2026, Strata Community Insurance quoted $2,423 and $3,258 a year for the whole building, which is the cost shared by both owners. Both are two-lot strata schemes, quoted as brick veneer with tiled roofs, no pool or other shared facilities, no claims in five years, $20 million of liability cover and a $1,000 excess.

About a third of each total is government charges and the insurer's fee, not premium. In NSW the charges include the emergency services levy. Our guide to how much strata insurance is sets these beside a six-unit block and shows the commission inside the premium.

Real quotes from one insurer for two real buildings, with the construction, sums insured and insurance history assumed by us. Our broker fee is not included. A different building, address, sum insured or claims history gives a different price, and a quote is the only way to know yours.

What do insurers ask about a duplex?

The online form asks about the scheme, not about each owner:

• the address, and the strata plan number if one has been issued
• the number of lots, buildings and storeys
• the year built, and what the walls, roof and floors are made of
• shared facilities such as a pool
• the current insurer and any claims in the last five years
• the building sum insured, which is the cost to rebuild both homes, including demolition, removal of debris and professional fees

The rebuilding cost is a different figure from what the two homes would sell for, which includes the land. A valuer can provide it.

This guide is general information only, not legal advice. The state rules are summarised from the government pages named above as they read in November 2026, and the legislation itself decides what a particular scheme must do.