01 01234567890 01234567890

How to Run a Property Feasibility Study for Land Subdivisions in NSW.

A real 47-lot Torrens Title subdivision in Western Sydney's Austral growth corridor, walked through line by line.

Feasibility

How to Run a Property Feasibility Study for Land Subdivisions in NSW

Most feasibility studies we see are built on assumptions, not numbers. A real one has six cost categories, a GST margin scheme calculation, a government contributions line that changes every six months, and a residual land value at the end that tells you exactly what the site is worth. Here is what that looks like using a live Western Sydney example.

Blackark Team Property Development Specialists · June 2026

The phone call usually goes like this: someone has been told a site can be subdivided, they have run some rough numbers in a spreadsheet, and it looks okay. They want to know if we agree. In most cases the answer is not that simple, because a rough spreadsheet is not a feasibility study. It is a set of guesses with a bottom line.

A real feasibility study for a Torrens Title land subdivision in NSW has six cost categories, each with multiple line items that most developers miss or underestimate. It requires a GST calculation that depends on your acquisition structure. It has government contribution numbers that were indexed in April 2026 and changed again. At the end of it, it produces a number called the Residual Land Value, the single most important output, and the one most feasibilities do not even include. You can run a quick residual land value on your own site with our free subdivision feasibility calculator.

Below, we walk through a real Torrens Title subdivision in NSW's Austral growth corridor, prepared by Blackark in May 2026 using current market comparables and cost estimates from our civil engineering consultants. Numbers have been reproduced from the working model. Nothing has been smoothed.

Step 01

Start With the GRV: What the Finished Lots Are Actually Worth

The Gross Realisable Value (GRV) is the total revenue you expect to receive from selling every lot at your adopted prices. It sits at the top of every feasibility model and every other number, costs, profit margin, residual land value, is expressed as a percentage of it. Get the GRV wrong and every number that follows is wrong.

GRV is established through comparable sales research in the immediate precinct, not from a price guide or a real estate agent's opinion. You need real transactions, on comparable lot sizes, within a close radius of the subject site, from the past three to six months at most.

Comparable Sale	Size	Price	$/m²
Fifteenth Ave, Austral (May 2026)	305 m²	$745,000	$2,441
Fifteenth Ave, Austral (May 2026)	305 m²	$745,000	$2,439
Solstice Street, Austral (May 2026)	303 m²	$735,000	$2,427
Kelly Street, Austral (Apr 2026)	312 m²	$725,000	$2,324
Kelly Street, Austral (Apr 2026)	320 m²	$740,000	$2,313
Carpathian Road, Austral (May 2026)	326 m²	$740,000	$2,270

Comparable sales, Austral NSW 2179, April–May 2026. All Torrens Title, R2 Low Density Residential.

The six sales above were all transacted within the Austral precinct in April and May 2026, on standard Torrens Title lots ranging from 303 to 326 square metres. The corridor is trading between $2,270 and $2,441 per square metre, with the tightest cluster sitting around $2,310 to $2,440.

From those comparables, lot pricing was adopted by category. Smaller standard lots at $695,000 to $700,000. Mid-range standard lots at $675,000 to $745,000. Corner and battleaxe configurations at $680,000 to $740,000. Large corner lots at $805,000 to $1,035,000.

Blended across the full site yield, that produces a total GRV of $35,295,350 at an average of approximately $751,000 per lot. That is the revenue ceiling. Everything else in the model, every cost, every margin, every return metric, is measured against it.

Step 02

Land Acquisition and Purchase Costs: The Number Most People Anchor To Too Early

Land price is not just the number on the contract. In NSW it carries stamp duty calculated on the full contract price, legal and conveyancing fees, pre-purchase due diligence costs, survey and title searches, and any sourcing or introducer fee. Miss any of these and your cost base is understated from day one.

In this example the site was acquired at $17 million. Stamp duty under NSW Revenue's current general rate schedule (non-FHB, over $1.168M: $47,295 + 5.5% of excess) calculates to $918,055. That is money out the door on day one before a single consultant is engaged.

The stamp duty line is one most developers know about but still underestimate. On large sites it regularly exceeds $900,000. It is payable at exchange, not at settlement, and it does not move regardless of how the deal is structured or financed.

Purchase Cost Breakdown, Austral Example

Item	Amount
Land acquisition	$17,000,000
NSW Transfer Duty (general rate, full contract price)	$918,055
Legal and conveyancing	$15,000
Due diligence, planning review, service enquiries	$20,000
Title searches, PEXA settlement	$2,000
Introducer / sourcing fee (1.1% of land price)	$200,000
Total Purchase Costs	$18,155,055

Step 03

Civil Works and Subdivision Costs: The Category That Destroys the Most Feasibilities

Civil works are the most underestimated cost category in NSW subdivision feasibilities. Most first-pass models include a single line labelled "civil works" with a round number. A proper cost estimate has more than twenty line items, several of them non-negotiable statutory charges that appear regardless of how simple the site looks from the street.

The Austral cost stack at a high level: The full working model breaks each category into individual items and source documents.

Civil Works, Subdivision and Consultant Costs

Category	Amount
Sydney Water infrastructure (reticulation, DSP charges, coordinator fees)	$711,500
Road, drainage, earthworks and pavement	$1,905,572
Electrical, telecommunications and undergrounding	$670,985
Site works (clearing, remediation, landscaping)	$251,412
Consultants and technical studies (DA, SWC and construction phases)	$388,400
Fees, levies, project management and titling	$615,392
Contingency (5%)	$227,163
Total Civil, Subdivision and Consultant Costs	$4,770,424

"Road, drainage and earthworks alone run to $1.9 million. That is before a single lot is connected to water, power, or the NBN."

The total of $4.77 million represents 13.5% of GRV, or approximately $101,500 per lot. That is the number that surprises most people. Civil cost in a standard Western Sydney subdivision is not $40,000 or $60,000 per lot. Once road construction, utility reticulation, earthworks, drainage, and consultant fees are properly accounted for, it consistently lands above six figures.

The 5% contingency is not optional. Unexpected soil conditions, retaining wall redesigns, additional material export, and RFI responses from council show up on nearly every project. Build it in from day one. On a complex site with significant topography, known fill material, or a community title road, increase it to 10%.

Step 04

Government Contributions: The $4.5 Million Line That Moves Every Six Months

NSW development contributions come in two forms. The first is the Section 7.11 contribution levied by the local council under their Development Contributions Plan, which funds local infrastructure: roads, parks, drainage, community facilities. The second is the Housing and Productivity Contribution (HPC), a NSW Government levy that applies to development in designated growth areas.

Both are indexed periodically and both are payable before the subdivision certificate is released. You cannot title your lots until you pay them. In growth area councils, these two numbers together are often the largest single cost lines in the feasibility after land.

Government Contributions, Liverpool City Council / Austral Precinct

$82,000 S7.11 contribution per lot, Liverpool City Council (Blackark estimate, May 2026)

$12,975 Housing and Productivity Contribution (HPC) per additional dwelling, NSW Government

$3,854,000 Total S7.11 contributions across all lots

$609,807 Total HPC across all lots

$4,463,807 Total government contributions

12.6% of GRV, second largest cost category after land

The S7.11 figure of $82,000 per lot is a Blackark estimate based on Liverpool City Council's current contributions plan for the Austral Precinct. This number must be confirmed from the DA consent conditions before any money changes hands. Councils recalculate and re-index their contributions plans, and the rate payable is the rate current at the date of payment, not the rate at the date of DA lodgement, and not the rate in any preliminary advice.

The HPC is similarly subject to indexation. The current rate of $12,974.62 per additional residential lot applies from the most recent NSW Government determination. Confirm the applicable rate from the NSW Planning Portal prior to DA lodgement and again prior to payment.

At $94,975 per lot in government contributions, the Austral example is representative of what growth area councils are now imposing. In some Western Sydney and Hunter Valley corridor councils, total contributions exceed $100,000 per lot. That is not a rounding error. In a lot of outer corridor deals, it is larger than the margin the subdivision was supposed to generate.

Step 05

Finance Costs: Every Week of Delay Has a Number and Most Models Ignore It

Finance cost in a feasibility study is not just the interest rate on your loan. It is a function of three variables: the rate, the drawn balance, and time. The most important of those is time, because time is the one most developers underestimate and the one councils and utility authorities have the most ability to extend.

In the Austral example, the developer elected to fund all land, stamp duty, and pre-construction costs from equity with no land loan. That structure eliminates land loan interest entirely and keeps the finance cost line low. The construction loan (50% of civil works, progressive draw over the 12-month construction period) carried the finance cost at 10% per annum on an average 50% progressive draw, producing a total construction loan interest of $131,970. Total finance cost including bank establishment and exit fees: $181,970, just 0.5% of GRV.

That figure reflects a fully equity-funded land position. For developers using private finance on the land, the numbers are materially different. Private development finance in 2026 sits at 8.95 to 12.95% per annum on the senior facility. On a $10 million land loan at 10%, each month of holding costs $83,333 in interest. A six-month DA extension that no one budgeted for adds $500,000 in unplanned finance cost, or 1.4% of GRV, potentially erasing the margin on a marginal site.

Step 06

Sales, Marketing, Legal and GST: The Margin Scheme Changes Everything

Sales costs are straightforward: selling agent commission (typically 1 to 2% of GRV), marketing spend on digital campaigns, portal listings, signage and renders, and legal fees for contract preparation. At a $35.3M GRV these total approximately $493,950, about 1.4% of GRV.

GST is where most owner-built feasibilities make a significant error. The standard method applies GST to the full sale price of each lot. The margin scheme, available to developers who purchased the land from a vendor who was eligible to use it, applies GST only to the value added (sale price less original purchase price). For this project:

Standard method: 1/11th of $35,295,350 = $3,208,668 payable
Margin scheme: 1/11th of ($35,295,350 minus $17,000,000) = $1,663,214 payable

The difference is $1,545,454, a saving of nearly 4.4% of GRV. Confirm GST margin scheme eligibility with your solicitor and the ATO before exchange. It is not automatic, it depends on the vendor's GST registration status and acquisition history, and it needs to be contractually agreed at the time of purchase.

Step 07

Holding Costs, Land Tax and Accounting: The Slow Leak Most Models Undercount

Land tax, council rates, insurance, accounting and tax structuring fees, and miscellaneous holding costs accumulate quietly across the life of a project. On a deal with a 36-month overall timeline, these are not rounding errors.

NSW land tax in 2026 on a $17M site held by an individual or company runs at approximately $306,616 per year. Two years of holding produces $593,232 in land tax alone. Council rates at approximately $82,317 per year, accounting and structuring at $25,000, and sundry miscellaneous costs bring the holding cost total to $725,549, or 2.1% of GRV.

NSW land tax thresholds and rates differ materially between individual, company, and trust ownership structures. A trust structure currently produces a lower annual land tax liability on this site. It is a structuring decision that needs to be made before exchange and confirmed with your accountant and solicitor.

Step 08

The Full Cost Stack: What the Numbers Look Like When You Add It All Up

Assembled across all six categories, the total project cost for a Torrens Title subdivision in the Austral corridor on a site acquired at $17 million looks like this:

Total Project Cost Summary, Torrens Title Subdivision, Austral NSW

Cost Category	Total ($)	Per Lot	% of GRV
1. Land & purchase costs (incl. stamp duty $918K)	$18,155,055	$386,278	51.4%
2. Civil works, subdivision & consultants	$4,770,424	$101,498	13.5%
3. Government contributions (S7.11 + HPC)	$4,463,807	$94,975	12.6%
4. Finance costs (construction loan + establishment)	$181,970	$3,872	0.5%
5. Sales, marketing & GST (margin scheme)	$2,157,167	$45,898	6.1%
6. Holding costs, land tax & accounting	$725,549	$15,437	2.1%
Total Project Costs	$30,453,972	$647,957	86.3%

Profit Summary

Metric	Result	Benchmark
Gross Realisable Value (GRV)	$35,295,350	Blended ~$751K per lot
Total Project Costs	$30,453,972	All six categories incl. GST
Gross Profit	$4,841,378	~$103K per lot
Profit Margin on GRV	13.7%	Target: 20–25%
Return on Investment (ROI on Cost)	15.9%	Target: 20%+
Project IRR (Equity, Annualised)	~16.0%	Benchmark: 20–35%+ p.a.

At a $17 million land price, this project returns a 13.7% profit margin on GRV and a 15.9% return on total cost. The industry benchmark is 20 to 25% margin on GRV and 20% ROI on cost. The project is not unviable, but it is sub-benchmark. The land was acquired at roughly $990K above the residual land value that supports a 20% return, and that premium sits directly in the margin.

This is exactly why the feasibility has to be run before any price is agreed, not after exchange as a confirmation exercise.

Step 09

Residual Land Value: The Number That Should Drive Every Acquisition Offer

The Residual Land Value (RLV) is the maximum you can pay for a site while still achieving your target return. It is calculated by working backwards from the GRV: subtract all project costs excluding land and stamp duty, apply your target margin, and what remains is what the land is worth to you.

The formula at a 20% target ROI on cost is:

RLV = GRV ÷ (1 + 0.20) − all non-land costs

In this Austral example:

GRV: $35,295,350
All costs excluding land and stamp duty: $12,535,917
Max total project cost at 20% ROI: $35,295,350 ÷ 1.20 = $29,412,792
Residual Land Value: $29,412,792 minus $12,535,917 (non-land/stamp costs) = approx. $16,013,000
Maximum offer with 5% negotiation buffer: $15,212,000

The site was acquired at $17 million. The RLV at 20% ROI is approximately $16.0 million, a gap of around $990,000. That gap is not fatal, but it means accepting a sub-benchmark return unless one of the input assumptions improves: a higher GRV through better lot pricing, a reduced civil cost from a more efficient layout, a lower contribution estimate at DA, or a land price renegotiation.

The RLV, at $15.2 million with a negotiation buffer built in, is the price to open at. Not the asking price. The asking price is the vendor's number. Your number comes from the feasibility.

Step 10

Stress-Testing the Feasibility: What Happens When Things Go Wrong

A feasibility is a point-in-time model. It does not know what the market will do in 18 months, what the DA will require, or what the ground conditions are. A proper feasibility includes a sensitivity table that shows how the return changes under different land price scenarios, so you know exactly how much room you have before the deal stops working.

Running the Austral model across different land price scenarios with all other inputs held constant produces the following returns:

Land Price Sensitivity Analysis, All Other Inputs Constant

Land Price	Gross Profit	Margin on GRV	ROI on Cost	Viable?
$13,000,000	$9,061,000	25.7%	34.5%	Yes, strong
$14,000,000	$8,007,000	22.7%	29.3%	Yes
$15,000,000	$6,952,000	19.7%	24.5%	Marginal
$17,000,000 ← actual	$4,841,378	13.7%	15.9%	Below benchmark
$19,000,000	$2,731,000	7.7%	8.4%	Not viable
$20,000,000	$1,677,000	4.7%	5.0%	Not viable

The sensitivity table is not there to make you feel better about the deal. It is there to show you exactly where the risk sits. In this case, the deal produces a strong market return at land prices below $15 million, becomes marginal around $15 million, and sits below benchmark at $17 million. At $17 million it is workable but not comfortable, provided the GRV holds, the civil estimate is accurate, and the DA timeline is not extended materially.

Run the sensitivity on GRV as well. A 5% reduction in lot pricing (from $751K blended to $714K blended) drops the GRV by $1.76 million and reduces the return further. Know the margin of error your deal can absorb before committing to a price. If a 5% GRV downside and a 10% civil cost overrun together push the project to near zero, you need a lower entry price or a better site.

The takeaway

What a Real Feasibility Study Is Actually Telling You

A feasibility study is not a document that confirms a deal. It is a tool that tells you what to pay, what return to expect, and how much buffer you have before the project stops making sense. The output that matters most is not the profit margin. It is the Residual Land Value, because that is the number that should drive every negotiation before exchange.

In the Austral example, the model produced a clear answer: at $17 million, the project generates a 15.9% ROI against a 20% benchmark. The deal is not unworkable, but the developer entered $990K above the RLV and is carrying that gap in their margin. Had the feasibility been run before price negotiations, the opening number would have been $15.2 million with documented justification from the cost stack. That is the value of the exercise.

A feasibility built on current numbers, actual comparable sales, indexed government contributions, current finance rates, a real civil estimate from an engineer who has looked at the survey, takes two to three weeks to prepare properly and costs a fraction of what a bad acquisition costs. Run it before you exchange. Not after.

Want a Feasibility Run on Your Site?

We build feasibility models with current civil cost estimates, indexed contribution rates, and real comparable sales. Not round numbers. If you are assessing a subdivisible site in NSW, we run the numbers before you commit to anything.

Get in Touch