Development Margin

Development margin is the number that tells you whether a project is worth doing. It's your profit expressed as a percentage, and it's the single metric that lenders, equity partners, and your own risk appetite will be measured against. Get the margin calculation wrong — or fail to stress-test it — and you can commit to a project that looks profitable on paper but loses money in practice.

There are two ways to express development margin, and they produce different numbers from the same project. Margin on cost (also called margin on total development cost) divides your profit by total development costs. If you spend $4 million and profit $800,000, your margin on cost is 20%. Margin on gross development value (GDV) — sometimes called margin on gross realisation (GR) — divides your profit by total revenue. That same $800,000 profit on $4.8 million in sales gives you a margin on GDV of 16.7%. Both numbers describe the same project. Lenders and valuers in Australia typically use margin on cost, so that's the number you'll present most often. Just make sure everyone in the conversation is using the same denominator.

What do lenders expect? Most Australian development lenders want to see a minimum margin on cost of 15-20% before they'll fund a project. The exact threshold depends on the lender, the project type, and market conditions. A straightforward duplex on a clean site with pre-sales secured might get funded at 15%. A complex mixed-use development with contamination risk, council uncertainty, and no pre-sales will need 25-30% to get a credit committee comfortable. Some lenders also set minimum profit thresholds in absolute dollar terms — they won't fund a project with less than $500,000 profit regardless of the margin percentage, because the risk-reward ratio doesn't justify their exposure.

Sensitivity analysis is what separates serious feasibility work from back-of-envelope guessing. Your base-case margin might look healthy at 22%, but what happens if construction costs blow out by 10%? What if sales prices drop by 5%? What if the build programme extends by three months, adding holding costs and prelims? Run each scenario individually, then run them in combination. The combination scenarios are what kill projects — a 5% cost increase combined with a 5% revenue decrease and a two-month delay can turn a 22% margin into a 5% margin disturbingly fast.

Margin compression is the slow erosion of your projected profit during the life of a project. It happens for predictable reasons: construction variations that weren't in the original budget, extended programmes that add holding costs and prelims, market softening that forces price reductions, and settlement delays that increase finance costs. On a typical 18-month project, some compression is almost inevitable. The question is whether your starting margin was fat enough to absorb it and still leave an acceptable return.

Experienced developers also distinguish between margin on cost and return on equity. You might have a 20% margin on cost, but if you're only contributing 20% equity (with 80% funded by debt), your return on equity is much higher — potentially 100% or more. This leverage effect is fundamental to development finance structuring. It's also why development is attractive to investors: the debt amplifies returns. But leverage works both ways. If the project loses money, you lose your equity first. A project that breaks even still costs you your entire equity contribution in opportunity cost and stress.

The final point on margin: don't confuse it with cash-in-pocket profit. Development margin is typically calculated before tax and before the developer's own time costs. If you're spending 18 months full-time managing a project, your time has a cost. A $400,000 margin that took 18 months of your life is a very different proposition to one that took 18 months of a project manager's time. Factor in your own opportunity cost when deciding whether a margin is acceptable for you.