Two builders can price the same drawings and come back hundreds of thousands apart. Usually that isn’t one of them overcharging. It’s that they’ve assumed different things about the site, included different items, and priced to different standards of finish. A headline figure tells you almost nothing until you know what sits behind it.
Here’s how to read them properly.
Get three quotes on identical documents
Three is the usual benchmark, but the number matters less than what you hand each builder. Same drawings, same written specification, same site information. If one builder is pricing from a concept sketch and another from a full set of working drawings, you aren’t comparing anything.
Ask for itemised quotes rather than a lump sum. A single number hides the decisions you need to see.
What to compare, line by line
- Brand, quality and quantity for every material and fitting
- What’s included and what’s excluded, stated explicitly
- Who arranges permits, and whether the fees are in the price
- Warranties and compliance certificates
- Whether the price is fixed or can move with material and labour costs
- How long the quote stays valid
That fifth point causes most of the disputes. A rise-and-fall clause means the figure you agreed to isn’t the figure you pay. Fixed price versus cost plus covers how the two structures behave over a long build.
Find the allowances
Every provisional sum is a price nobody has settled yet. Tapware, tiles, landscaping and joinery are the usual candidates. A quote with generous allowances looks competitive and then moves once real products are selected.
Ask each builder which items are allowances, what figure they’ve used, and what happens when the actual cost lands above it. A builder who has selections locked before contract carries fewer of these, which is one reason their quote may look higher on the first read.
Ask what they assumed about the site
This is where the biggest gaps come from. Soil classification, site access, rock, existing structures, service connections, fall across the block. One builder prices a problem; another assumes it away and raises it as a variation later.
Ask each one directly: what does this quote assume about the site, and what happens in the contract if it turns out differently? The answers usually explain the price difference on their own. What happens in pre-construction goes through how those unknowns get resolved before work starts.
What “affordable” means for a custom build
Searches for affordable custom home builders in Melbourne usually aren’t about finding the cheapest quote. They’re about knowing what a price actually covers.
Cost, quality and time trade against each other, and custom work pushes cost up by definition. A quote that looks cheap is normally a quote that has left something out, and the gap reappears later as a variation. The useful question isn’t which number is lowest. It’s which number is complete.
Then check the paperwork
- Registration belongs to individuals, not companies. Confirm the named practitioner and their class on the Building and Plumbing Commission register, some domestic registrations are limited to specific trades such as bricklaying.
- Work over $10,000 requires a written major domestic building contract.
- You have five business days to withdraw after receiving the signed contract, unless a lawyer reviewed it for you first.
- Domestic building insurance applies above $16,000. Those arrangements moved to the BPC recently, so older advice online may be out of date. Ask to see the certificate of currency.
For the wider selection process; portfolios, references, visiting finished homes, see our guide to finding the best custom home builder in Melbourne, or what separates the best custom home builders from the rest.
Where a custom builder fits
A custom home builder manages the full process of designing and constructing a home for one client on one site, rather than adapting a plan from a range. That difference shows up in the quote: more line items, fewer standard assumptions, and selections that have to be resolved earlier.
Pascon are custom home builders in Melbourne working across the inner, bayside and eastern suburbs. Every project runs on a fixed-price contract issued before work starts, with weekly updates through the build. See how that works on our custom home builders in Melbourne page, browse completed work in the portfolio, or talk to our team about your block.
Questions People Ask When Comparing Builder Quotes
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1. How many quotes should I get for a home build?
Three is a sound benchmark. The important part is that each builder prices identical drawings and the same written specification, otherwise the figures aren’t comparable regardless of how many you collect.
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2. Why do builder quotes differ so much for the same plans?
Usually because of site assumptions and exclusions rather than margin. Soil, access, permits, allowances and finish quality all vary between quotes. Asking what each one assumes about the site explains most of the gap.
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3. What should a building quote include?
An itemised breakdown of materials by brand and quantity, inclusions and exclusions, who arranges permits, warranties, whether the price is fixed or variable, and how long the quote stays valid.
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4. Is the cheapest quote a red flag?
Not automatically, but it deserves scrutiny. Ask what has been excluded and how variations are priced. A low figure with items missing often finishes higher than a fuller quote.
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5. What is a provisional sum in a building quote?
An estimated amount for an item not yet selected or priced, such as tiles or tapware. If the real cost exceeds it, you pay the difference, so ask how many your quote contains.
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6. Do I need my own architect to get a custom home quote?
No, though you need documentation detailed enough for builders to price consistently. Some custom home builders in Melbourne work with your architect; others connect you with design partners and document the project in-house.
Compare What’s Behind the Number
The quote that looks highest is often the one that has priced the whole job. Ask what each builder assumed, what they left out, and what moves after you sign, then compare.
