The pre-contract checklist: 18 things to confirm before you sign with a builder

SEPTEMBER 23, 2026•Homes & residential guides•13 min read

Table of Contents

The contract signing is presented as an administrative step at the end of a long, friendly process. It is not. It is the moment your leverage transfers to the other side. Everything that is vague in the document you sign becomes a conversation you will have later, from a weaker position, about money.

This before you sign with a builder checklist covers 18 items across the contract, the specification and the plan itself. Each one is confirmable in advance, each one has a cost if you miss it, and none of them requires you to distrust the builder. They are the questions a well-run building business expects to be asked.

>>> Learn more about choosing the best home builder

Before you sign with a builder checklist: white contemporary residence under palms — Everything on the list is cheaper before this

Before you sign with a builder checklist: The contract

The contracting entity matches the licensed entity: The company name on the contract must be the company that holds the builder’s licence. A trading name is not a company. Verify the licence with your state authority.
Domestic building insurance is in place: Required above a threshold that varies by state. Confirm the insurer, the policy and that the builder’s eligibility limit sits comfortably above your contract value.
The contract sum and what sits outside it: Site costs, connections, driveways, landscaping, letterbox, clothesline. The list of exclusions is more informative than the inclusions.
Every provisional sum, and how it was estimated: A provisional sum is a placeholder for work not yet defined. Each one is a future adjustment, and a low allowance today is a variation tomorrow.
Every prime cost item, and the allowance: Tapware, tiles, appliances. Compare the allowance against what you actually intend to select.
The variation margin, stated as a percentage: In writing. “We price variations fairly” is not a term.
Progress payment stages against real completion: A schedule that is front-loaded relative to work completed transfers risk to you.
Extension of time provisions: What entitles the builder to more time, whether costs follow the time, and how notice must be given.
Liquidated damages, if any: What you receive if the build runs late, and whether the amount is meaningful.
The definition of practical completion: What must actually be finished before the final payment falls due, and who determines it.
The defects liability period and process: How long, how defects are logged, and the response time.
Dispute resolution pathway: Which body handles a dispute in your state, and what has to happen first.

Key insight: Every one of these is cheap to clarify now and expensive to argue later. A builder who answers them in writing is showing you how they run jobs.

The specification

The full specification document, not the inclusions brochure: The brochure is marketing. The specification is the contract’s annexure and it governs what gets built.
Named products with codes, not categories: “Quality tapware” is not a specification. A named product in a named range is.
The finishes schedule is complete before signing: Late selections are the most common client-caused delay in Australian residential work, and every one becomes a variation.
Energy performance documentation: The NatHERS assessment for the design, since NCC 2022 requires new homes to meet a 7-star whole-of-house standard plus a Whole of Home assessment. Confirm the rating relates to the plan you are signing.
Structural and engineering documents: Site classification under AS 2870, footing design, and whether the site cost allowance reflects the actual classification rather than an assumption.
The construction programme: A real schedule with stages and durations. If the builder cannot produce one, they are not managing one.

What each miss actually costs

Item missed	Typical consequence
Low provisional sum for site costs	The most common overrun on Australian residential builds
Prime cost allowances below your actual taste	Every selection becomes an upgrade invoice
No stated variation margin	Every change priced without a reference point
Incomplete finishes schedule	Delay plus variation, compounding
Front-loaded payment schedule	You fund work not yet done
Vague practical completion	Final payment disputes at the least convenient moment
No programme	No basis to identify or discuss delay
Specification by category	You receive the cheapest thing that meets the description

What this means for your decision: Decisions resolved before the contract is signed cost nothing to change. The same change during construction is priced at the builder’s margin, at a point where you have no competitive leverage and no alternative supplier.

>>> Learn more about the custom-built homes Melbourne checklist

The item most people skip: Testing the plan

Twelve of the eighteen items above are document checks. The most expensive misunderstandings are not in the documents at all, because plans are not how anybody judges space.

Walk the home at full scale: Ceiling heights, corridor widths, the distance from the island to the rear bench, the turn at the top of the stairs. Every one of these is judged by standing in it.
See the finishes in position: A 600 by 600 tile and a 1,200 by 600 tile look similar on a board and produce different rooms.
Check the bulkheads and services: The bulkhead over the kitchen and the air conditioning head positions are the most under-documented elements in Australian residential work.
Test the orientation: A sun study on true north from survey shows whether the living space gets the winter light the design assumes.
Confirm the void and ceiling transitions: Where a raked or double-height space meets a standard ceiling.
Record the approval against a drawing revision: So what you approved and what the contract covers are provably the same thing.

That last point is what converts a good review into a contractual protection. In Victoria, variations to a major domestic building contract must be documented in writing before the work is carried out, and equivalent requirements apply in other states, so a dated record tied to a named revision is genuinely useful.

State-by-state, where to verify

State	Licensing and consumer authority
Victoria	Victorian Building Authority, and Consumer Affairs Victoria for contracts
New South Wales	NSW Fair Trading
Queensland	Queensland Building and Construction Commission
South Australia	Consumer and Business Services
Western Australia	Building and Energy, Department of Energy, Mines, Industry Regulation and Safety
Tasmania	Consumer, Building and Occupational Services
Australian Capital Territory	Access Canberra
Northern Territory	NT Building Practitioners Board

Thresholds for insurance, deposit limits and cooling-off periods differ by state and are reviewed periodically. Confirm current figures with the relevant authority rather than relying on any general guide.

>>> Learn more about interior finishes

Restrained bedroom in soft grey and linen — Read the inclusions, not the render

Get a lawyer to read it

The fee for an independent legal review of a domestic building contract is a fraction of a single variation. Ask specifically about:

The exclusions list and its completeness
Whether the payment schedule matches the statutory limits in your state
The extension of time and delay cost provisions
Whether the specification is properly incorporated as a contract document
What happens if the builder becomes insolvent mid-build
The deposit amount against the statutory cap

A builder using a standard industry contract such as an HIA or Master Builders form is normal. The standard form is not the issue. What matters is the schedule, the annexures and the specification attached to it, which is where every project-specific term lives.

How DX Living supports the pre-contract review

DX Living is a project control specialist firm that combines project planning with visualisation to de-risk residential projects before construction. Before a client signs, that means the design walked at full scale in DX Studio so spatial decisions are settled while they are still free, finishes reviewed in position through DX Interiors, the construction programme made legible so the durations in the contract can be understood, and the approval recorded against a named drawing revision. High-end residential engagements run through DX Prestige, with delivered work in the project collection.

DX Living is not a builder, a law firm, an architecture practice or a licensing authority, and this article is general information rather than legal advice. Visualisation does not replace documentation, independent legal review, engineering certification or building approval.

Conclusion

Before you sign with a builder, confirm the licensed entity, the insurance, the exclusions, every provisional sum and prime cost item, the variation margin in writing, the payment schedule against real completion, and the definition of practical completion. Get the full specification rather than the brochure and complete the finishes schedule before signing rather than after. Then do the thing most people skip and walk the home at full scale, because the misunderstanding that costs the most is spatial and no document review will catch it.

Reviewing a contract and a plan? Talk to DX Living.

FAQs

What should be on a before you sign with a builder checklist?

Eighteen items across three groups. Contract: Licensed entity, insurance, exclusions, provisional sums, prime cost items, variation margin, payment stages, extension of time, liquidated damages, practical completion, defects liability, dispute pathway. Specification: The full document, named products, a complete finishes schedule, energy documentation, engineering, and the construction programme. Plus a full-scale review of the plan itself.

What is the difference between a provisional sum and a prime cost item?

A provisional sum is an allowance for work that has not yet been fully defined, such as site costs or retaining. A prime cost item is an allowance for a product not yet selected, such as tapware or appliances. Both are placeholders, and both adjust once the real scope or product is known.

How do I check a builder is licensed in Australia?

Through your state authority: The Victorian Building Authority in Victoria, NSW Fair Trading, the Queensland Building and Construction Commission, Consumer and Business Services in South Australia, and the equivalent body in other states and territories. Confirm the licence number, the exact entity name and any conditions, and check the licensed entity is the one signing your contract.

What should the variation margin be?

There is no standard rate, which is why the point is having it stated as a percentage in writing before you sign rather than negotiating it once you have no alternative supplier. A builder who discloses their margin up front is being straightforward about how change will be priced.

Do I need a lawyer to review a building contract?

It is strongly advisable, and the fee is a fraction of a single variation. Ask specifically about the exclusions list, whether the payment schedule and deposit comply with your state’s statutory limits, the extension of time provisions, whether the specification is properly incorporated, and what happens if the builder becomes insolvent.

Why does the plan need reviewing if the documents are correct?

Because the most expensive misunderstandings on residential projects are spatial, and they survive every document review. Ceiling heights, corridor widths, joinery clearances, bulkheads and the real light in a room are judged by standing in the space, not by reading a dimension on a plan.

When is it too late to change something?

Practically, once the contract is signed. After that a change is a variation, priced at the builder’s margin without competitive tension. In Victoria, variations to a major domestic building contract must be documented in writing before the work is carried out, and similar requirements apply elsewhere, so keep every approval dated and tied to a drawing revision.