Development Feasibility
Calculator
The most detailed free feasibility tool for Western Sydney developers. Analyse costs, finance, profit margins, ROI, and approval pathways — all in one place.
What do you want to build?
Select the type of development you’re considering
How to Use This Development Feasibility Calculator
Our free Development Feasibility Calculator helps you assess whether your development project in Western Sydney is financially viable. Simply follow the 6-step process to get a detailed analysis including total project costs, profit margins, ROI, rental yields, and sensitivity scenarios.
What This Calculator Covers
Full Cost Breakdown
Land acquisition, stamp duty, construction, site works, professional fees, council fees, and holding costs
NSW Stamp Duty Calculator
Automatically calculates NSW transfer duty based on your purchase price using current 2024-25 brackets
Profit & ROI Analysis
Net profit, return on investment, development margin, and cash-on-cash return calculations
Sensitivity Analysis
See how your project performs in pessimistic, base case, and optimistic scenarios
Approval Pathway
Determines whether CDC or DA is recommended based on your project type and site conditions
Rental Yield Estimates
Gross rental yield and weekly income estimates based on current Western Sydney market data
Frequently Asked Questions
How accurate is this feasibility calculator?
This tool provides indicative estimates based on current Western Sydney market data and typical construction costs. For precise figures, we recommend a professional feasibility study with quantity surveyor costings. Buildana offers free initial consultations.
What is a development margin and what's a good target?
Development margin is net profit divided by end value. A healthy development margin is typically 15–20%+ for the risk involved. Below 10% is generally considered too tight given the risks of construction and property development.
What's the difference between DA and CDC?
A Development Application (DA) goes through full council assessment (45–120 days). A Complying Development Certificate (CDC) is a fast-track approval via a private certifier (8–30 business days), available when your project meets specific standards in the relevant codes.
What costs are NOT included in this calculator?
This calculator doesn't include furniture/staging, marketing campaigns, GST implications for developers (margin scheme vs standard), legal disputes, environmental remediation beyond basic estimates, or costs relating to subdivision registration.
Can I use this for a property I don't own yet?
Absolutely — that's one of the main use cases. Enter the expected purchase price to see the full acquisition and development cost picture before committing to a purchase.
How this feasibility model works
Most property development failures happen at the feasibility stage, not the build stage. Projects that don’t pencil get pushed forward anyway because the maths was never properly done; projects that would have penciled get abandoned because no one ran the numbers far enough. The calculator above is the same feasibility model Buildana runs internally before quoting a development client: land acquisition through to net profit on sale, with every line item that a bank, a JV partner or your accountant will ask about.
How the numbers are sourced. Construction cost uses 2026 Western Sydney rates reconciled across three sources \u2014 Rawlinsons Australian Construction Handbook, Buildana’s own invoice-level actuals from 50+ completed projects, and a Sydney trade overlay (concreting, brickwork and structural steel sit 12\u201318% above national rates). Council Section 7.11/7.12 contributions are pre-loaded for the five core Western Sydney LGAs. Stamp duty, conveyancing, holding-period interest, BASIX, planner and certifier fees all use 2026 schedules. Sale comparables are indexed off recent suburb transactions, not real estate listing optimism.
What this is good for, and what it isn’t. Good for: triaging two or three sites against each other, sanity-checking a builder’s quote, deciding whether to commission a paid town planner report, or supporting a development finance application alongside a QS report. Not good for: replacing site-specific town planning advice on overlays (flood, bushfire, contamination, heritage), modelling specific tax outcomes (GST margin scheme treatment, capital gains, depreciation), or pricing the exact final contract. If you want a paid-grade feasibility on a specific Western Sydney site for free, send the address to [email protected] \u2014 we run them in 48 hours.
Frequently asked
About this feasibility calculator
What does this feasibility calculator actually output?
Total project cost (land + acquisition + construction + fees + holding + contingency), gross development value, net profit, profit margin as a percentage of project cost, residual land value, project ROI, and a sensitivity table showing how the result moves if construction cost or sale price shifts ±10%. It’s the same output structure a quantity surveyor or development finance broker uses.
What inputs do I need to run a useful feasibility?
Minimum: site address (for suburb-level comparable sales and LGA fee data), purchase price, lot size, dwelling configuration (duplex / townhouse count / granny flat), and target build size. The calculator pre-fills construction cost, professional fees, council Section 7.11/7.12 contributions, stamp duty, holding cost interest rate and selling costs from 2026 Western Sydney data — override any of these if you have specific numbers from your broker, planner or accountant.
How is the construction cost data calculated?
Three sources combined and reconciled: Rawlinsons Australian Construction Handbook 2026 base rates, Buildana’s own invoice-level actuals from 50+ Western Sydney builds, and a Sydney trade overlay capturing where local rates run materially above national benchmarks (concreting, brickwork and structural steel at 12–18% above national as of 2026). Per-m² rates are reviewed every six months. The methodology is documented on the data hub.
Is this calculator suitable for first-time developers?
Yes — the inputs are arranged in the order a first-time developer thinks about a project (site, costs, revenue), each field has a short explainer of what it means, and the output highlights the three or four numbers that actually decide whether a project is viable. If the projected margin is below 15% on a duplex or below 18% on a townhouse, the project is too thin once cost overruns and timeline slippage are factored in — the calculator flags this automatically.
What about hold-and-rent strategies rather than build-and-sell?
The calculator focuses on the build-to-sell scenario by default because that’s where most first-time developers get their numbers wrong. For build-to-hold the cash-flow profile is different — use the specific tools: Duplex Rental Yield Calculator or Granny Flat ROI Calculator. For mixed strategy (sell one, hold one) the downloadable Feasibility Template spreadsheet models both legs simultaneously.
How accurate is the projected profit margin?
Used with realistic inputs — land cost from a signed contract, conservative sale comparables from a buyer’s agent (not real estate listing optimism), honest timeline assumptions — expect ±10–15% accuracy on final net margin against the closed project. The three inputs that move accuracy most are timeline (every extra month adds holding cost), gross sale price (the biggest variable) and site-specific cost factors (slope, soil, demolition) that the model can’t see from inputs alone.
Will a finance broker or bank accept this output for a loan application?
Most non-bank development lenders and private finance brokers will accept it as the borrower’s feasibility. Major banks typically require a quantity surveyor (QS) report on top of the borrower’s feasibility — the calculator gives you and the QS the same baseline numbers so the report aligns rather than contradicting. For deals above $5M total project cost expect to need both this output plus a paid town planner statement plus a QS report.
Does Buildana offer free site-specific feasibility on top of this calculator?
Yes. For projects in our five core Western Sydney LGAs (Fairfield, Liverpool, Cumberland, Canterbury-Bankstown, Blacktown) we’ll run a paid-grade feasibility on your site for free — including zoning review, comparable sales analysis, site-specific cost loading, and a hold-vs-sell sensitivity. Usually returned within 48 hours. Send the address and project type to [email protected].