Front elevation of The Cornerstone, a 5 bedroom 3 bathroom home design for a 15m frontage
Independent building advice, WA

One block. Two homes.
One title.

A dual key home puts two self-contained residences inside one building, on one block, under one land title. Two front doors, two kitchens, one build.

3,500+
homes delivered
$960M+
contract value delivered
83+
years of combined experience
$0
cost to you. Builders pay us
Start here

Is a dual key right for your situation?

Tell us what you are trying to achieve and where you are up to. We will tell you whether a dual key stacks up for you, what it needs from a block, and what the real numbers look like on the designs that fit. At no cost to you.

What happens after you send it
1
We call you back

A consultant, the same business day. No sales script.

2
We work out what fits

Your goal, your borrowing position, and whether a dual key is the right structure at all.

3
You get the numbers

The designs that suit, what they need from a block, and the costs and returns for your situation.

The idea in five beats

Looks like one property. Works like two.

One building on one block. Inside it, two homes that never have to meet.

One block
Two front doors
Two kitchens
Two living spaces
Two independent residences
In plain English

So how does a dual key actually work?

A dual key home is designed from the ground up as two self-contained residences inside one building. Each has its own entry, its own kitchen, its own living space, its own bathroom and its own laundry. Neither has to walk through the other to get anywhere.

You are not subdividing, you are not buying two blocks, and you are not running two builds. It stays one property on one land title, built under one contract, on one construction programme.

One rectangular block on a single land title, containing two attached residences. Each residence has its own front door, its own kitchen and its own living space.ONE LAND TITLERESIDENCE 1RESIDENCE 2
Two self-contained residences. One block, one title, one build.
Side by side

Same block. Two different propositions.

The land does not change. What changes is how much the building on it can do.

A standard single dwelling compared with a dual key home on the same block
FeatureStandard homeDual key home
Land titlesOneOne
Dwellings on the blockOneTwo
Separate entriesNoYes
Separate kitchensNoYes
Tenancies possibleOneUp to two
Live in one, let the otherNoYes
Frontage usually neededFrom about 10mFrom about 15m

A dual key is not a subdivision

You are not creating two titles or two blocks. It stays one property, and it is bought, financed and rated as one.

If separate titles are what you are actually after, that is a different conversation, and we will have it with you rather than sell you this one.

Inside a dual key

Two homes. Without buying two blocks.

The Cornerstone is the clearest version of the idea on our range: independent front and rear residences, each with its own front door.

Floor plan of The Cornerstone, a 5 bedroom 3 bathroom home design with a double garage, 15m frontage
  • Bedrooms5 across both residences
  • Bathrooms3
  • Car spaces2
  • FrontageFrom 15m

What each residence has of its own

Which residence is bigger, and how the bedrooms split between them, changes from design to design. The full plan for this one is on its own page.

Four dual key designs

One idea. Four ways to build it.

Every one of these is on our design range with a full floor plan. Which one suits comes down to the block, the budget and what you are trying to achieve, which is the conversation rather than the catalogue.

Front elevation of The Cornerstone, a 5 bedroom 3 bathroom home design for a 15m frontage
Design render

The Cornerstone

  • 5 bed
  • 3 bath
  • 2 car
  • 15m frontage

Independent front and rear residences, each with its own entry. The clearest expression of the idea on a 15m block.

Front elevation of The Dual Income, a 6 bedroom 3 bathroom home design for a 15m frontage
Design render

The Dual Income

  • 6 bed
  • 3 bath
  • 2 car
  • 15m frontage

Six bedrooms across both dwellings. The second has its own entry, kitchen, lounge, semi-ensuite and laundry.

Front elevation of The Legacy, a 6 bedroom 3 bathroom home design for a 15m frontage
Design render

The Legacy

  • 6 bed
  • 3 bath
  • 2 car
  • 15m frontage

Built for family that stays close without living on top of each other. Three bathrooms and a private WC.

Front elevation of The Duplex, a 4 bedroom 3 bathroom home design for a 15m frontage
Design render

The Duplex

  • 4 bed
  • 3 bath
  • 3 car
  • 15m frontage

The compact one. Four bedrooms, three bathrooms and a three car carport on a single lot.

Elevation images are design renders supplied by the builder. They are not photographs of completed House & Land Co projects. Final design, inclusions, frontage requirements and pricing depend on the block, the builder, the estate and your own selections.

Straight answer

One idea. Different life plans.

A dual key suits a few very different people for very different reasons. It also does not suit everyone, and we would rather say so than sell you one.

A desk with a laptop, calculator and printed finance charts

The investor

Two rental incomes from one block, on one title.

A couple holding the keys to their new home among moving boxes

Live in one, let the other

Your tenant helps carry the mortgage, through a wall you own.

A family with two young children unpacking moving boxes in an empty living room

Family, close but separate

Parents or adult kids next door, with their own front door.

A young couple and their dog sitting on the floor of an empty room

The long game

Let both now. Move family in later, without buying again.

But it is not for everyone

A dual key needs a wider block than a standard home, usually from about 15m of frontage, and not every estate or zoning will take one.

Lenders assess them differently to a standard build, and so do some property managers. A smaller buyer pool matters too if you might sell inside a few years. Whether it stacks up depends on your borrowing position and what you are actually trying to achieve.

That is why we start with your situation rather than a floor plan, and why we will tell you when the answer is no.

Not sure which of those you are?

Most people are not, at this point. That is the conversation.

Why us

You are not buying from a builder.
You are working with an independent advisor.

Builders sell their own homes, and the salesperson in the display village works for the builder. We are a building advisory. We compare across a panel, check whether a dual key suits your block and your borrowing position before anyone talks price, and coordinate land, finance and the build as one job.

You pay us nothing, at any stage. We are paid a commission by the builder you choose, from their side, and it is not added to your contract. Ask us how it works for you.

“The right team to talk to. We received a genuine and better offer to assist our situation, with more than what we expected to get.”
Julia Rossana, Perth, WA
A House & Land Co consultant meeting a client in hi-vis workwear to go through her build options
Our process

From idea to keys

The order matters. We check the money and the block before anyone shows you a floor plan.

1

Tell us your situation

Your goal, your borrowing position, and whether you already have a block.

2

We check it stacks up

Whether a dual key suits what you are after, and what it needs from a block.

3

Land

We find a block that can take one, in an estate and a zoning that allows it.

4

Design and builder

We match the design to the goal and compare across the panel on real pricing.

5

Build

One contract, one programme. We coordinate it and keep you updated.

6

Move in, or let it

Live in one and let the other, let both, or move family in.

Before you ask

The questions we get most

One building on one block, designed as two self-contained residences. Each has its own front entry, kitchen, living space, bathroom and laundry, so neither has to walk through the other. It is bought and held as a single property on a single land title.

No. A subdivision splits the land into separate titles, and a duplex is usually two dwellings that can end up on separate titles. A dual key stays one title and one property throughout. That is the point of it: you get two residences without the cost, the approvals and the timeline of splitting the land.

Usually from about 15m of frontage. Every dual key design on our range is drawn for a 15m block, which is wider than a standard house and land package needs. Zoning and the estate’s own design guidelines matter too, and some estates will not allow one at all. Checking that before anything else is the first thing we do.

Yes, and it is one of the more common reasons people look at this. It is also worth thinking through properly, because living next door to a tenant suits some people and not others, and the way you use it can affect how it is treated for tax. We would talk that through with you, and we would say so if we thought it was a poor fit.

Differently to a standard build, and not every lender treats them the same way. Some are comfortable with them, some are not, and how any rental income is assessed varies. That is exactly why we check borrowing capacity with a broker before we go looking at land or designs, rather than after. We are not licensed to give you credit advice, and we will not pretend otherwise.

It is a smaller buyer pool than a standard family home, and an honest answer has to start there. What it has going for it is that it appeals to investors and to families who need two households under one roof, and that it is one title so it sells as one straightforward transaction. Whether that trade suits you depends on how long you intend to hold it.

No. Our advice is free to you. We are paid a commission by the builder you ultimately choose, from our panel of builder partners, and it is not added to your contract. That is how the model works, and it is why we can tell you a dual key is the wrong move without it costing us anything. The full explanation is here.

Front elevation of The Avon, a 4 bedroom 2 bathroom home design for a 12.5m frontage
Start with the strategy, not the house

See whether a dual key suits your situation

Tell us what you are trying to achieve and where you are up to. A consultant calls you back the same business day with a straight answer on whether a dual key stacks up for you, which designs fit, and what they need from a block. If it does not stack up, we will tell you that too.

What you get
Free, and independent

See if a dual key suits you

Tell us what you are trying to achieve. We will come back the same business day on whether a dual key stacks up for your situation, and which designs fit.