- A sound development deal starts with site fundamentals, not projected profits.
- Always work backwards from realistic end values, not optimistic ones.
- The feasibility model is a tool, not a crystal ball — stress-test every assumption.
- Look for alignment between the developer’s experience and the project’s complexity.
- If you cannot explain the deal in two minutes, you probably do not understand it yet.
Every property development opportunity comes wrapped in a spreadsheet. Revenue projections, cost estimates, profit margins, IRRs — the numbers can be overwhelming. But experienced investors know that the spreadsheet is only as reliable as the assumptions behind it. Here is a structured approach to assessing a development deal without drowning in detail.
Start With the Site, Not the Spreadsheet
Before you open a feasibility model, ask three questions about the site itself. First, does the zoning and planning framework support what the developer intends to build? A site zoned for three townhouses that is being modelled for six is already a red flag. Second, what is the local market actually absorbing? Look at comparable sales within a tight radius — not across an entire suburb. Third, are there obvious site constraints such as easements, contamination risk, heritage overlays, or flooding? These are the factors that blow budgets apart, and they should be addressed before anyone starts modelling returns.
Understand the Revenue Assumptions
The single biggest variable in any development feasibility is the end sale price. A five per cent swing in revenue can turn a profitable project into a loss-making one. When reviewing revenue assumptions, check whether the projected sale prices are supported by recent comparable evidence. Be cautious of models that rely on “premium above market” claims without clear justification. In many cases, a conservative estimate of end value is the most responsible starting point. Ask the developer what evidence supports their pricing and whether an independent valuation has been obtained.
Pull Apart the Cost Estimate
Construction costs are typically the largest single line item. A credible feasibility will show a detailed cost breakdown rather than a single lump sum figure. Look for whether the construction estimate comes from a quantity surveyor or builder quote, or whether it is a rough rate-per-square-metre assumption. Other costs to scrutinise include land acquisition costs including stamp duty, consultant fees covering architects, engineers, and planners, statutory charges such as council contributions and utility connections, finance costs including interest and establishment fees, sales and marketing costs, and a contingency allowance which should generally sit between five and ten per cent of construction costs. If contingency is missing or sits below five per cent, ask why.
Assess the Timeline
Time is cost in property development. Every month a project runs adds holding costs, interest, and opportunity cost. Review the assumed timeline critically. Has the developer allowed realistic periods for planning approval, which in South Australia can take several months? Is the construction period consistent with the scale and type of build? Has settlement risk been considered, particularly for off-the-plan sales? A common mistake is modelling a best-case timeline. Experienced developers plan for reasonable delays and price them in.
Look at the Profit Margin and What It Really Means
Most development feasibilities express profit as a percentage of total development cost or as a return on equity. A healthy margin for a small-to-medium residential project in Australia typically sits above fifteen to twenty per cent of total development cost, though this varies with risk profile. However, the margin on paper means little if the assumptions are aggressive. A twenty-five per cent margin built on optimistic sales prices and tight timelines may be riskier than a fifteen per cent margin built on conservative numbers.
Evaluate the Developer
The numbers only matter if the person or team behind them can deliver. Consider the developer’s track record on projects of similar scale and type. Ask about their relationship with their builder, how they manage cost overruns, and whether they have completed projects through a full market cycle. A less experienced developer taking on a complex project is a risk factor, regardless of how attractive the feasibility looks.
Checklist: Assessing a Development Deal
Use this checklist before committing capital to any development opportunity:
- Zoning and planning confirmed as suitable for the proposed development
- End sale values supported by recent comparable evidence
- Construction cost estimate from a qualified source with line-item detail
- Contingency allowance of five to ten per cent included
- Realistic timeline with allowances for approval and construction delays
- Finance structure clearly outlined including terms, rates, and security
- Developer track record verified on similar projects
- Independent valuation or market assessment obtained
- Legal structure and investor protections documented
- Exit strategy clearly defined with fallback options
Common Mistakes When Assessing Deals
The most frequent errors investors make when evaluating development opportunities include relying solely on the developer’s feasibility without independent verification, focusing on the headline return while ignoring the assumptions that drive it, underestimating the impact of time delays on overall returns, failing to ask about contingency planning and what happens if costs increase, not understanding the security structure and ranking of their investment, and comparing deals across different risk profiles as though they are equivalent.
Frequently Asked Questions
What return should I expect from a property development investment?
Returns vary significantly depending on the project type, location, risk profile, and capital structure. Equity investors in small-to-medium developments may target returns above fifteen per cent, while debt investors may accept lower returns for greater security. Always assess returns relative to the risk involved.
How do I verify a developer’s track record?
Ask for a project history with addresses and outcomes. Speak to previous investors if possible. Check ASIC records for the corporate entity and search for any disputes or insolvency history.
Should I get independent legal advice before investing?
Absolutely. Independent legal advice ensures you understand the structure, your rights, and the risks specific to your circumstances.
What is the difference between return on cost and return on equity?
Return on total development cost measures profit as a percentage of all project costs. Return on equity measures your profit relative to the capital you have invested, which will be higher if the project uses debt to fund a portion of costs.
How important is the location within a suburb?
Extremely important. Two sites in the same suburb can have very different end values depending on proximity to amenities, street appeal, orientation, and micro-market conditions.
What questions should I ask a developer at first meeting?
Ask about their experience with similar projects, their builder relationships, how they handle cost overruns, what security they offer investors, and what happens if the project does not proceed as planned.
If you are evaluating a development opportunity and want a second opinion on the numbers, our team is available for a confidential discussion. Download the Deal Assessment Checklist or contact us to book a 15-minute introductory call.
General information only, not financial, tax, or legal advice. Seek independent advice for your circumstances.