How to Build a House in Sydney [2026 Step-by-Step Guide]

Step 1: Set a realistic all-in budget

The builder’s base price is only part of the cost. Before you sign anything, add up everything it takes to get from vacant land to a finished home you can live in.

• Land price, plus transfer duty on the land and conveyancing
• Site survey, soil (geotechnical) and engineering reports
• Design changes, upgrades and prime cost items beyond the base inclusions
• BASIX certificate, development application or CDC fees, and certifier fees
• Local infrastructure contributions, where your council charges them
• Utility connections, driveway, landscaping, fencing and window coverings
• Rent or other housing costs while you build, plus loan interest during construction
• A contingency for variations and delays

The NSW Planning Portal’s MyHome Planner lists these costs stage by stage and is worth reading before you talk to builders. Choose your fittings, tiles and appliances before you sign, listing brands and models where you can, so the quote reflects what you actually want.

Step 2: Line up construction finance before you commit

A construction loan works differently from a standard home loan. The lender approves the full amount up front but pays it out in progress payments as each stage is finished. You start making repayments once the first progress payment is drawn. Interest is charged on the amount drawn so far, so repayments usually start small and grow as the build progresses.

To approve a construction loan, lenders generally want a fixed-price building contract, plans and specifications, and your council or certifier approval, and they usually value the home as if it were finished. Your lender will also send you and your builder a formal letter before construction can begin.

First Home Owner Grant

$10,000 if land plus build is $750,000 or less

5% Deposit Scheme

Land plus build within the $1.5 million Sydney cap

Vacant land duty (first home)

No duty on land up to $350,000; reduced duty below $450,000

Builder’s deposit

Maximum 10% of the contract price

If you need the First Home Owner Grant for your first progress payment, apply through the lender providing your finance. Building your first home? Our building your own home page explains how we help first home builders.

Step 3: Buy land, or plan a knockdown rebuild

How you buy the land affects your transfer duty. Revenue NSW treats these arrangements differently:

• Land and a separate building contract. Duty is charged on the land only, not on the cost of the house you build afterwards.
• House and land package delivered complete. If the seller agrees to hand over a finished house at settlement (in one contract, or two contracts with settlement tied to completion), duty is charged on the land and house together.

First home buyers buying vacant land to build on pay no transfer duty on land valued up to $350,000, and reduced duty on land valued below $450,000. Our guide to the first home vacant land concession has the details.

If you already own a home, a knockdown rebuild avoids buying land altogether. You’ll need somewhere to live during the build, and your approval can come through either a development application or a complying development certificate.

Step 4: Choose a licensed builder and sign the right contract

Check the builder’s contractor licence on the NSW Government’s online licence check before you sign, and make sure the licence is in the name of the company or person signing the contract. Building Commission NSW’s Consumer Building Guide, which your builder must give you for work over $5,000, explains your rights.

Items you haven’t chosen yet, such as an oven or special tapware, appear as prime cost (PC) items with an allowance. If your final choice costs more than the allowance, you pay the difference, so check the allowances are realistic.

Step 5: Get approvals: DA, CDC and BASIX

Approvals start with your site. Many builders ask you to sign a preliminary agreement, usually for a fee, so they can arrange a site survey, engineering and soil reports and, where trees are involved, an arborist report. Those reports shape the final plans and the detailed quote.

Every new home in NSW then needs planning approval before work starts. There are two common pathways:

• Development application (DA). Lodged with your council through the NSW Planning Portal. Once consent is granted you also need a construction certificate before building starts.
• Complying development certificate (CDC). A combined planning and construction approval for straightforward homes that meet set standards, assessed by council or a registered certifier. Most project homes use this path.

Both need a BASIX certificate showing the design meets NSW sustainability requirements. You, as the owner, must also appoint a principal certifier (council or a registered certifier) to inspect the build and issue the occupation certificate. Your builder can’t appoint them for you.

Step 6: Construction stages and progress payments

Construction follows a predictable sequence, and your progress payments are tied to it. Your contract sets out the exact stages and amounts.

1. 1

   Site preparation

   Levelling, clearing, fencing, and demolition for a knockdown rebuild.

2. 2

   Foundations and slab

   Footings, drainage, moisture barriers and termite protection, then the slab.

3. 3

   Frame

   Frame, roof, and rough-in of wiring and plumbing.

4. 4

   Lock-up

   Doors, windows and roofing installed, so the home can be locked and secured.

5. 5

   Fit-out

   Kitchen, bathrooms, fittings and fixtures installed.

6. 6

   Practical completion

   Final detailing, painting and fencing, then your pre-handover inspection.

When a stage is finished, the builder invoices you, you sign it off and send it to your lender, and the lender pays the builder. Builders can’t ask for progress payments before the work is done. Your certifier inspects critical stages such as footings, slab, frame, stormwater and waterproofing, and some owners also pay an independent building consultant to check each stage before paying; the NSW Government suggests budgeting $250 to $500 per inspection.

Step 7: Handover, occupation certificate and moving in

At practical completion, walk through the home with the builder and list any defects in writing. Your principal certifier does the final inspection and, if everything complies, issues the occupation certificate. You can’t legally move in without it, and your lender will usually need it before releasing the final payment.

Once the final progress payment is drawn, your loan moves to its standard repayments. Your home is covered by statutory warranties of six years for major defects and two years for other defects, from completion. If you received the First Home Owner Grant, you must move in within 12 months of completion and live there for at least 12 continuous months.

How long does it take to build a house in Sydney?

There’s no standard timeframe. Approvals, the builder’s workload and the complexity of your site all matter, and the NSW Government lists common causes of delay: the approval process, weather, shortages of materials or qualified trades, design variations and the number of projects your builder is running.

Plan for delays rather than hoping to avoid them:

• Ask the builder for a realistic construction period in the contract, and what allowances it includes for delays.
• Check the liquidated damages clause reflects your real cost of a late handover, such as extra rent.
• Budget for rent and loan interest running at the same time for longer than you expect.
• Remember that your builder usually can’t increase the price because of a delay unless you’ve approved a variation to the work.

Building versus buying? Our guide to buying a house in Sydney covers the other path, and the First Home Owner Grant guide explains the $10,000 grant in full.

Frequently asked questions

Do I pay stamp duty on the building contract when I build?

Generally no. If you buy the land and sign a separate contract with a builder, NSW transfer duty is charged on the land. If you buy a house and land package where the seller is responsible for delivering a completed home before settlement, duty is charged on the value of the land and the house together. Your conveyancer can confirm which applies to your contracts.

How does a construction loan work?

Your lender approves the total loan but releases it in stages. When the builder finishes a stage, such as the slab or frame, they invoice you, you sign off and send it to your lender, and the lender pays the builder. You usually pay interest only on the amount drawn so far, so repayments grow as construction progresses.

What is the maximum deposit a builder can ask for in NSW?

Under NSW home building law, the maximum deposit is 10% of the contract price. For work that must be covered by the Home Building Compensation Scheme, generally residential work over $20,000, it is illegal for the builder to ask for a deposit or any payment until the cover is in place and you have been given the certificate.

Can I move into my new home before the occupation certificate is issued?

No. An occupation certificate authorises you to occupy and use a new building. Your principal certifier issues it after the final inspection, once the work meets the approval and the Building Code of Australia. Lenders usually also want to see it before releasing the final payment to the builder.

What warranties do I get on a new home in NSW?

The Home Building Act gives you statutory warranties even if they aren’t written into your contract. They run for six years for major defects and two years for all other defects, from completion of the work. Home building compensation cover also protects you if the builder can’t finish the job or honour those warranties because of insolvency, death or disappearance.

Sources

1. NSW Government: Contracts for residential building work (opens in a new tab)
2. NSW Planning Portal, MyHome Planner: Approve phase (opens in a new tab)
3. NSW Planning Portal, MyHome Planner: Build phase (opens in a new tab)
4. Revenue NSW: First Home Owner (New Homes) Grant (opens in a new tab)
5. Revenue NSW: Ruling DUT 018, Dutiable transactions over land and improvements (opens in a new tab)
6. Australian Government 5% Deposit Scheme: property price caps (opens in a new tab)