Property Development Feasibility Calculator Australia

Estimate profit and margin on a property development project.

Land cost$Construction cost$Other costs / fees%Expected gross realisation value$

—projected profit

—total development cost

—margin on cost

—margin on GRV

"Other costs / fees" covers council contributions, consultants, professional fees and finance/holding costs, typically estimated as a percentage of land + construction cost. Adjust it to match your project's actual budget.

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About the Property Development Feasibility Calculator

A feasibility study is the first gate any development project passes through — before you commit to land, finance or a build contract, you want a quick read on whether the numbers stack up. This calculator gives a simplified static feasibility: total cost against expected sale proceeds, expressed as a dollar profit and two margin percentages developers commonly quote.

How it works

Total development cost = land cost + construction cost + other costs/fees, where other costs/fees is a percentage of (land + construction) covering council contributions, consultants, professional fees and finance/holding costs.
Profit = expected gross realisation value (GRV) − total development cost.
Margin on cost = profit ÷ total cost, the ratio most developers and financiers use as a hurdle rate.
Margin on GRV = profit ÷ GRV, sometimes preferred because it's expressed against the same base as the sale revenue.

Assumptions and behaviour

The default 10% other costs/fees is a rough planning figure — real projects range from around 8% to 20%+ depending on scale, DA complexity and finance structure.
This is a static, single-point feasibility, not a cash-flow model — it doesn't account for the timing of costs and sales, holding costs beyond what's in the fee percentage, or GST.
Assumes the entire GRV is achieved as modelled, with no allowance for sales risk, market movement, or unsold stock.

Limitations

Doesn't model GST on new residential sales, finance interest schedules, or staged cash flow — a full feasibility for a real project should be done with a quantity surveyor, development manager or accountant.
Margin on cost hurdle rates vary by lender and project risk — many financiers look for 15-20%+ before funding, but this is not lending advice.
Doesn't account for contingency separately — fold an allowance into the other costs percentage if you want one included.

Privacy

The calculation runs entirely in your browser. Nothing is uploaded or stored.

Frequently asked questions

Is this feasibility calculator free?

Yes — free, no sign-up, no limits, runs in your browser.

What's a good margin on cost for a development?

It varies by project risk, market and financier, but many lenders and developers look for a margin on cost of roughly 15-20% or more before proceeding. This is general information, not financial advice.

What does 'other costs / fees' include?

Typically council contributions, consultant and professional fees (architects, engineers, surveyors), marketing, and finance/holding costs — estimated here as a percentage of land plus construction cost.

Does this include GST?

No. GST on new residential property sales (including the margin scheme) isn't modelled — factor it in separately or speak with your accountant.

Is my data uploaded?

No. Everything runs locally in your browser; nothing is sent or stored.

Written by Lakshay Kumar(TechLakshay)

A QA Automation Engineer by trade, Lakshay's real passion is untangling complex problems into simple, working solutions — which is exactly why FreeMyTask exists. On Instagram, he channels that same instinct into helping 26,000+ content creators with SEO education, motivation, and hands-on query solving.

Last updated: August 22, 2026