A Site and Finance Checklist Before Building a New Home

Most new-home problems begin before a plan is drawn. The block and the budget determine what you can realistically build, so both need careful checks while you can still walk away, adjust your expectations or change course.

Verify what the land allows before you buy

Choosing a floor plan first and hoping the land suits it is risky. Title and zoning set firm limits on what is allowed, where the house can sit and how large the overall footprint can be.

Start with the title. Most detached-house lots use Torrens title, which keeps ownership and boundaries clear for a standard build. If the lot uses a different title system, there may be shared driveways or common rules that limit structures, so have a conveyancer confirm the details before you pay any holding deposit. Then check the zoning and the controls tied to it. Height, setbacks, site coverage and minimum frontage all affect what fits on the block. A 10-metre frontage or a flood planning control can rule out the plan you saved on your phone, regardless of how well it works elsewhere.

Look closely at easements. A drainage or power easement can run through the middle of the best building area, and you can't place a slab or services over it. Covenants matter as well. They can dictate setbacks or cladding and restrict outbuildings. Get the deposited plan and the drainage diagram before making a decision. Walk the block and note pits, poles, large trees and side windows next door that could affect privacy, positioning and costs.

Don't skip this step.

Rejecting the wrong block is cheaper than redesigning around it. Some buyers pay for concept drawings that prove impractical because an easement leaves insufficient room for the garage. A solicitor review and a planning check take days, while a redesign can take weeks and may still leave you with compromises.

Get soil and slope data before you compare quotes

Quotes mean little without reliable soil and level data. Two blocks on the same street can have very different footing and earthworks requirements, and that difference can show up as tens of thousands of dollars.

Order a geotechnical survey. It classifies the soil from Class A to Class P, which tells the engineer how much the ground is likely to move with changes in moisture. Stable sand needs a simple slab edge. Highly reactive clay needs deeper footings and more steel, along with extra drainage care around the house. You don't need to memorise the engineering details. You do need the written classification so every builder is pricing the same site conditions rather than working from a general assumption.

Order a contour survey at the same time. It maps levels across the block in small increments and shows the fall from front to back and from side to side. Even half a metre of fall changes the amount of cut and fill, as well as the retaining needed around the slab. On a steeper block, the cut and fill alone can outweigh the cost of an upgraded kitchen. There is no reliable way to price retaining work without accurate levels.

Don't accept a flat quote that assumes "standard soil and flat site" when the block hasn't been tested. Ask builders to allow for your actual soil classification and site levels in writing. We want site readiness and financial readiness to move together, rather than treating one as something to consider only after the other is settled.

Confirm the approval path and what it demands

Approval affects more than paperwork. It helps set the timeline and determines how much design freedom you have, so confirm the likely path before committing to a start date.

In New South Wales there are two common routes. A Complying Development Certificate, often called a CDC, is a fast-track assessment against fixed codes. If the design meets every control for setbacks, height, privacy and planting, a private certifier can approve it in weeks rather than months. A Development Application, or DA, goes through council and generally takes longer. It allows more flexibility when the design doesn't meet the strict CDC controls, such as where a wider house or a variation to setbacks is proposed.

Ask your builder which path they intend to use for your block and plan, and ask them to explain why. A useful answer identifies the controls they have checked and provides the expected timeframe. A vague answer should be treated as a warning sign. You don't want to learn after signing that the design never met the CDC rules and now requires a full council review.

Allow for conditions as well. Either path can impose tree protection and erosion controls that add time to the program. Neighbour notification can cause further delay. Record the assumed approval path and the allowance for approval time in your file notes so you can refer back to them later.

Shortlist builders on quote detail, not headline price

This is where many comparisons go wrong. Buyers line up base prices and select the lowest, only to learn that soil work, drainage, earthworks and slope costs were never included. A useful comparison has to cover more than the advertised base price.

Ask each builder for a line-item breakdown of site costs tied directly to your soil test and contour plan. The breakdown should list footing upgrades for your soil class, earthworks volumes, retaining, stormwater pits and pipes, along with connection charges. It should also state clearly what is provisional and what is fixed. A builder who itemises soil, drainage, earthworks and connections in clear dollar terms leaves less room for unexpected costs than one who puts everything into a general lump sum.

Local knowledge helps with this assessment. When comparing home builders south west sydney has to offer, ask how each builder's quote reflects local soil conditions and council requirements.

Don't reward vagueness. If one quote is $30,000 cheaper but includes no allowance for cut and fill while the others do, it isn't a lower equivalent price. It is an incomplete quote. We suggest shortlisting two builders whose site allowances reflect your reports, then comparing their inclusions and timelines. This provides a more useful apples-to-apples view and gives you a clearer basis for negotiations.

Price compliance and connections that buyers miss

Some costs don't appear in display-home pricing. They arise from energy, water, drainage and council requirements, and they apply to every new home. Include them early when working through the budget.

The BASIX certificate is one. It sets targets for energy and water use that affect glazing choices and insulation levels in the walls and roof. It also affects shower heads, taps, toilets and tanks, as well as rainwater requirements. A design with large western glass will need better glazing or shading to pass, which adds to the cost. Ask who prepares the certificate and whether the glazing and insulation in the quote already meet its requirements. If they don't, get the upgrade figure in writing.

Stormwater is another area to check. Every roof needs a legal point of discharge to council pipes or an on-site system. On some blocks, the connection point is close and relatively cheap. On others, you need long runs, pits, easement drains and charged lines that cost considerably more. Get the hydraulic advice and the connection quote before signing, rather than waiting until the slab stage.

Add council conditions to the list. Bonds, inspections, crossover work and tree controls all carry fees. None of these items is particularly exciting, but allowing for them is better than receiving another invoice when the frame is already up.

Get finance set up for how a build is paid

A build isn't funded in the same way as an established purchase. The loan, budget, block and building program all have to align, so arrange the finance before becoming attached to a particular facade.

Start with pre-approval. It gives you a clear indication of borrowing capacity for the land-and-build package together, rather than for the land alone. Share your actual deposit, debts, income and living costs with the lender so the figure is useful. This helps prevent you from shortlisting homes you can't fund and shows builders that you are ready to proceed. Pre-approval isn't a guarantee, but it turns general browsing into a more practical plan.

Understand how a construction loan works. Funds are released in progress payments as the work is completed. Typical stages are slab, frame, lock-up and fit-out, followed by a final payment on completion. Interest is charged only on the amount drawn so far, which keeps early repayments lower while construction is underway. You'll need valuations at the start and inspections before each draw, so keep the paperwork organised and allow a few days for every payment to clear.

Watch the deposit gap. If your deposit is under 20% of the total package, lenders mortgage insurance may apply, depending on your loan arrangements and eligibility, and could reduce the amount you can put towards the build itself. Discuss the all-in number with your lender instead of focusing only on the base price. Site costs, upgrades, fees and a buffer all need to fit within the approved total.

Read the fine print on deposits and variations

Paperwork can protect you when you read and understand it before signing. Two areas are responsible for much of the budget pain: deposits and variations.

Deposit rules in New South Wales cap what a builder can request upfront. Under the Home Building Act 1989 (NSW), the deposit can't be more than 10% of the contract price. Use that limit as a benchmark. If you're asked to pay more, don't proceed. Pay by a traceable method and keep the receipt with the signed contract and related records.

Read the HIA contract sections on variations and site conditions carefully. A variation is any change to the scope or price after signing, and it is the most common cause of budget blowouts. The contract should explain how variations are priced and who must approve them in writing. It should also set out the process for handling delays. Check the clause covering unforeseen ground conditions as well. It should explain what happens if rock or poor bearing is found after excavation starts. You want a documented process that requires your signed approval before additional work is billed, rather than a phone call followed by an invoice.

Keep a 5-10% contingency outside the contract sum. Site costs alone can add $20,000 to $50,000 over advertised base prices on difficult blocks, so a buffer isn't simply pessimism. It helps you stay in control when soil conditions or weather force a change. Arrange an independent inspection at each progress payment and match every claim to the work completed.

A smoother build usually comes from checked land, tested soil, detailed quotes and finance that matches the payment stages. Complete that groundwork first and the design decisions become easier. You'll be choosing from plans you know will fit, based on prices you have properly reviewed and can take to your lender.