Beginner's Guide to Buying a Semi-Detached House

A semi-detached house sits on its own title but shares a common wall with one neighbour. For first home buyers in Perth, this type of property delivers more space and land than a unit while requiring less capital than a detached house.

What Qualifies as a Semi-Detached House for Finance Purposes

Lenders classify a property as semi-detached when it shares a common wall under strata or survey-strata title. In most suburbs across Perth, including Brabham, Henley Brook and areas across the City of Swan corridor, semi-detached stock forms a growing proportion of new residential supply. The distinction matters because lenders treat semi-detached homes differently from townhouses or units when it comes to deposit requirements and property valuation.

A buyer purchasing a semi-detached house valued at the Perth metro median of $960,000 would typically be assessed using detached house lending criteria rather than unit criteria. The property must have its own street frontage or defined separate access for most lenders to apply these terms.

Low Deposit Options Under the Australian Government 5% Deposit Scheme

The Australian Government 5% Deposit Scheme allows eligible first home buyers to purchase with a 5% deposit while Housing Australia guarantees the difference between the deposit and 20% of the property value. No Lenders Mortgage Insurance is payable. For Western Australia, the property price cap is $850,000 in Perth and metropolitan postcodes, and $600,000 in the rest of the state.

Consider a buyer purchasing a semi-detached house in Brabham priced at $850,000. With a 5% deposit of $42,500, the buyer would avoid LMI and gain access to the same variable and fixed interest rate options available to buyers with a 20% deposit. The scheme does not restrict property type, meaning semi-detached houses on survey-strata title are eligible provided the price and assessed value both fall within the cap.

The scheme operates through participating lenders, not directly through Housing Australia. Buyers should confirm that their chosen lender offers the full range of loan features, including offset accounts and flexible repayment structures, under the scheme.

First Home Owner Rate of Duty and the Survey-Strata Expansion

From 7 May 2026, Western Australia removed the geographic distinction between Perth, Peel and regional areas for the First Home Owner Rate of duty. A single statewide threshold now applies. No duty is payable on homes valued up to $600,000. A concessional rate applies on homes valued between $600,001 and $800,000, calculated at $16.15 for every $100 or part thereof above $600,000.

From 12 March 2026, the off-the-plan duty concession expanded to include survey-strata schemes. This change made semi-detached houses and duplexes eligible for the first time. For pre-construction contracts entered into after 12 March 2026, a 100% concession capped at $50,000 applies on dwellings valued up to $800,000. The concession reduces proportionally to 50% for dwellings valued between $800,001 and $899,999, with a 50% concession applying above $900,000.

In a scenario where a buyer signs a pre-construction contract for a semi-detached house in Bullsbrook valued at $750,000, the buyer would receive a full duty exemption under the off-the-plan concession. If the same buyer were purchasing the property under construction rather than pre-construction, the concession would reduce to 75%, capped at $50,000. The concession runs until 30 June 2028.

How Lenders Value Semi-Detached Stock Compared to Standalone Homes

Lenders order valuations based on comparable sales, and semi-detached properties are typically valued against other semi-detached stock rather than detached houses. In suburbs where semi-detached supply is limited, valuer margins of error widen. A buyer purchasing in The Vines, where the house median is $1,080,000 and transaction volumes are strong, would receive a more precise valuation than a buyer in Upper Swan, where only 20 house sales occurred in the past 12 months and semi-detached stock is rare.

When the valuation comes in below the purchase price, the shortfall must be funded by the buyer. Under the 5% Deposit Scheme, both the purchase price and the lender's assessed value must be at or below the applicable cap. If a property is contracted at $850,000 but valued at $830,000, the buyer would need to fund the $20,000 difference in cash or reduce the purchase price through renegotiation.

Combining State Grants with Federal Deposit Schemes

The First Home Owner Grant in Western Australia provides $10,000 for eligible buyers purchasing or building a new home. The grant applies to new homes only and does not apply to established properties. For transactions commencing on or after 7 May 2026, the value cap is $800,000 for homes south of the 26th parallel, which includes all Perth metropolitan areas.

A buyer using the 5% Deposit Scheme to purchase a new semi-detached house in Henley Brook priced at $825,000 would not be eligible for the FHOG because the property exceeds the $800,000 cap. The same buyer purchasing a property priced at $780,000 would receive the $10,000 grant and could use it toward settlement costs, furniture or offset contributions. The FHOG can be combined with the 5% Deposit Scheme but cannot be combined with Help to Buy.

State stamp duty concessions can generally be used alongside the 5% Deposit Scheme. Buyers should confirm their eligibility for both the grant and the duty concession by checking the applicable value caps and residency requirements before signing a contract.

Fixed and Variable Rate Structures for First Home Buyers

Most first home buyers purchasing a semi-detached house choose either a variable rate loan with an offset account or a split loan structure that combines fixed and variable components. An offset account reduces the interest charged by offsetting the balance held in a linked transaction account against the loan principal. A buyer with a $750,000 loan and $30,000 in an offset account pays interest on $720,000.

Fixed interest rates provide certainty over repayments for a set period, typically between one and five years. Variable interest rates move with changes in the official cash rate and lender repricing decisions. Buyers who fix the full loan amount sacrifice access to offset accounts and flexible repayment features during the fixed period.

A split loan structure allows the buyer to fix a portion of the loan while leaving the remainder on a variable rate linked to an offset account. In our experience, buyers with irregular income or annual bonuses benefit from retaining offset access while managing rate risk through a partial fix.

Pre-Approval and Settlement Timing for Off-the-Plan Purchases

Buyers purchasing a semi-detached house off-the-plan should obtain pre-approval before signing the contract. Pre-approval confirms borrowing capacity and deposit adequacy but does not lock in an interest rate. The rate applying at settlement is the rate available when the loan is drawn down, not the rate available at contract.

For off-the-plan purchases with settlement occurring 12 to 18 months after contract, interest rates may move materially during construction. Buyers should structure their savings to accommodate rate increases and avoid over-committing based on pre-approval rates that may no longer apply.

Settlement costs for semi-detached houses include transfer duty (unless fully exempt), legal fees, bank establishment fees, building and pest inspections if not waived under the contract, and strata or survey-strata search fees. These costs typically total between 3% and 5% of the purchase price, depending on whether duty applies and whether LMI is payable.

Loan Features That Matter for Semi-Detached Ownership

Semi-detached ownership under strata or survey-strata title involves ongoing levies for shared infrastructure, common property insurance and sinking fund contributions. Buyers should confirm that their loan structure includes redraw or offset access to manage levy increases without needing to refinance.

An offset account linked to the variable portion of a loan provides greater liquidity than a redraw facility. Redraw access may be restricted or removed by the lender if the loan is in arrears or if the borrower's financial position deteriorates. Offset balances remain in the borrower's transaction account and are not held by the lender.

Buyers purchasing investment property in the form of a semi-detached house should prioritise offset access over redraw because offset balances do not reduce the deductible interest component of an investment loan for tax purposes, while redrawn principal does. For owner-occupiers, the distinction is less material, but offset accounts provide greater flexibility and immediate access to funds.

Call one of our team or book an appointment at a time that works for you.

Frequently Asked Questions