Insights · Custom homes · Choosing a builder
Custom vs Volume Builder: What You Actually Pay For
The display home is the best version of the house. Your block usually isn't the display block.
I don't think volume builders are bad. On a flat, square estate lot with a catalogue plan you like, they can be excellent value. The trouble starts when the block, the brief or the budget stops matching the brochure, and the upgrade sheet takes over.
Short answer
How does a custom builder differ from a volume builder?
A volume builder sells catalogue designs at a base price, with upgrades and site costs often added later, and works best on flat, regular greenfield lots. A custom builder designs for your block and brief, then gives a fixed price for the finished design. Rawlinsons prices project houses well below individual houses per square metre, but the gap narrows on sloping, narrow or knockdown sites.
Written and reviewed by Oliver Alameri
Licensed builder, NSW Contractor Licence 487805C · Founder, Buildana
Fact-checked
Two different products, not two prices for one
Rawlinsons, the cost handbook most Australian estimators use, prices them as separate categories. Its 2021 Sydney tables put a medium-standard brick veneer project house of 160 to 190 square metres at $1,365 to $1,470 a square metre. A medium-standard brick veneer individual house of 150 to 350 square metres was $1,965 to $2,120.
That gap isn't all margin. Project homes repeat the same plans hundreds of times, buy materials in bulk, use standardised details and build on prepared estate lots. Individual homes carry design time, one-off detailing, more complex structure and more supervision.
Both rates have climbed a long way since 2021. The relationship between them hasn't changed much.
Where volume builders genuinely win
Picture a 450-square-metre lot in a new estate: flat, rectangular, engineered fill, services at the boundary. A catalogue design drops on it without a single change. That's the volume builder's home ground, and it's hard to beat on price or speed.
You also get certainty about what the finished house looks like, because you've walked through it. For a lot of first-home buyers, that's worth a great deal.
Holding a volume builder quote?
Send it to me with the address. I'll show you what's likely missing, and roughly what a custom design would cost on the same lot.
0476 300 300Where the base price stops being the price
The display home almost never matches the base price. Ceiling heights, facade, flooring, benchtops, tapware, ducted air, alfresco, driveway: plenty of it sits on the upgrade list. Walk through the display with the inclusions sheet in hand and mark what's standard. It's usually sobering.
Then come site costs. Slope, rock, reactive clay, fill, retaining, a long sewer run, bushfire construction. These are often quoted separately after a site inspection, and on an established suburban block they can be substantial.
Knockdown rebuilds add another layer: demolition, asbestos, a narrow frontage, a neighbour's wall on the boundary. The catalogue plan has to be modified, and every modification is priced as a variation to a system built to avoid them.
- Mark what's actually standard in the display home
- Get site costs in writing before you commit
- Ask how plan changes are priced
- Check what happens if the slab design changes after soil testing
Compare finished price to finished price. The base price is a starting bid, not a quote.
What you get from a custom builder
A design that starts from your block and your life. Rooms sized for your furniture, windows placed for your views and your sun, a plan that deals with the slope or the narrow frontage instead of fighting it.
And a price that comes after the design, not before. Once the drawings are done and the engineering is in, a good custom builder gives you a fixed price with itemised inclusions. Fewer surprises, because there's no catalogue to modify.
The trade-offs are real. It costs more per square metre and takes longer to reach a price, because design happens first. You don't get to walk through the finished house beforehand, so you need to trust drawings, renders and the builder's past work.
How I'd decide
If your lot is flat and regular, you love a catalogue plan as it stands, and budget is the main driver, get volume builder quotes and compare the finished price carefully.
If your lot slopes, is narrow, is a knockdown in an established street, or your brief needs real design, talk to custom builders. By the time a catalogue home has been modified and site-costed for that block, the difference often isn't what the base price suggested.
Comparing a volume quote with a custom quote
Line these up before you compare the bottom figures.
- 01
Same floor area and number of rooms
- 02
Site costs included, with soil and survey done
- 03
Same ceiling heights, facade and finishes
- 04
Driveway, landscaping and fencing in both
- 05
Approval path and fees included in both
- 06
How variations and provisional sums are handled
Custom and volume builders compared
Are volume builders cheaper than custom builders?
Per square metre, usually yes, especially on flat greenfield lots. Once upgrades, site costs and plan changes are added for a tricky block, the gap can shrink considerably.
Can a volume builder change a catalogue design?
Most allow some changes, but each is priced as a variation and structural changes may be limited. Big changes often cost more than designing from scratch.
What are site costs?
Costs to prepare your particular block for the house: earthworks, retaining, engineered footings for the soil, service connections and access. They vary widely from lot to lot.
Is a custom home worth it for a knockdown rebuild?
Often. Established lots have neighbours, trees, slopes and odd frontages that catalogue plans handle poorly, so a design made for the site usually fits better and costs fewer variations.
Sources and references
Costs are from the Rawlinsons handbook with the local cost index applied; rules and timeframes are checked against the sources below.
Pick the builder that fits your block.
Send me your lot and your brief. I'll tell you honestly whether you need a custom builder at all.