Residual Land Price Research: Connect Exit Evidence to Full Project Cost

Start from a supported product scenario

Residual land price research works backwards from a proposed completed asset and the costs needed to create and sell it. First state the product, the assumed sale timing and the comparable evidence. If the evidence describes land, a different building type or an earlier condition, it cannot directly support the proposed completed value. A residual worksheet is a scenario, not a valuation.

Use a complete cost register

Separate land acquisition, transaction expenses, design, approvals, demolition, site works, construction, services, financing, holding and selling costs. Identify taxes for professional review rather than inferring their treatment. A building quote has its own inclusions and exclusions; it is not automatically the full project cost. Record the evidence and responsible person for each line.

Keep price and cash timing connected

Record when deposits, progress payments, fees, interest and receipts occur. The same final totals can create different cash pressure when payments arrive earlier or the sale occurs later. Ask the finance professional to review the funding assumptions. Moneysmart identifies “Interest rates” as a property-investment risk.1 A static margin cannot remove the consequences of financing or delay.

Separate desired margin from observed evidence

A chosen project allowance or target margin is a decision assumption. It is not a market observation and should not be presented as an earned result. Keep the arithmetic visible: scenario net sale proceeds, less non-land project costs and the chosen allowance, produces a scenario amount available for acquisition. Allocate purchase-related costs consistently to avoid omitting them or counting them twice.

Run paired downside cases

Change sale proceeds, site costs and timing in separately labelled scenarios. Describe why each change is being considered and which assumptions remain unresolved. Do not use an optimistic comparable, an incomplete quote and a short timeline together without disclosing the combination. CAV’s pricing guidance remains useful for checking the underlying sales evidence.2

Use the worksheet to decide what to verify

The most useful output is a list of assumptions that could change the acquisition decision: title conditions, site scope, comparable quality, finance or sale timing. Seek property-specific legal, building, valuation and tax advice where relevant. Keep the worksheet’s preparation date and source references. Do not turn the calculated residual into a personalised offer recommendation without the required review.

Questions buyers ask

Is a residual worksheet a valuation?

No. It is an assumption-based scenario that needs supported costs, sales evidence and appropriate review.

Can a construction quote stand for total project cost?

Only if its documented scope actually covers every relevant cost; otherwise add the missing lines separately.

Continue the evidence check

Use the development evidence hub to build a source-linked issue register, then compare the Development Insights methodology and current tool. These articles explain research methods; they do not reproduce proprietary transaction databases or establish an approval, valuation or future result.