The most expensive mistake in townhouse development usually happens before construction starts.
It happens when someone buys the wrong block. Or trusts rough numbers scribbled on the back of a coffee receipt. Or assumes council will approve four townhouses because the neighbour built four five years ago.
At MJS Construction Group, we’ve seen developers lose serious money simply because they skipped proper feasibility work early in the process. One client came to us after purchasing a site in Melbourne’s south-east believing they could build three premium townhouses. After reviewing the overlays, setbacks, and private open space requirements, the site realistically supported only two dwellings. By that point, they were already committed.
That’s the hard truth about townhouse development. If the numbers don’t stack up before settlement, the project can quickly become a millstone around your neck.
A proper feasibility study helps you avoid that situation. It shows whether the site works financially, practically, and from a planning perspective before you commit serious capital.
Why Most Townhouse Developments Fail Before Construction Starts
Hidden costs can derail a project quickly
First-time developers often focus heavily on the purchase price and end sale values. The trouble starts when the “small” costs pile up.
Council contributions, demolition, retaining walls, stormwater upgrades, finance interest, landscaping, and service connections can quietly chew through your margin faster than a tradie through a meat pie on smoko.
In Melbourne, sloping blocks are one of the biggest traps. We worked with a client in Bentleigh East who purchased a site without a geotechnical investigation. Once excavation started, unstable soil conditions required deep piling and additional retaining works. The extra cost pushed construction well beyond the original feasibility allowance.
That project still proceeded successfully, but only because there was enough contingency built into the numbers.
Why feasibility matters more in today’s market
Townhouse feasibility has become far more important across Victoria over the past few years.
Construction costs remain high. Interest rates have increased holding costs. Councils are scrutinising density more closely, especially in established suburbs across Bayside and the inner-east.
Projects that may have worked comfortably in 2020 now sit on razor-thin margins.
Developers also face:
- Longer planning timeframes
- Labour shortages
- Higher consultant fees
- Increased infrastructure contributions
- More cautious bank lending
The days of “she’ll be right” feasibility are long gone.
A quick example of how one planning issue changes everything
Imagine a developer purchases a 780-square-metre corner block in Cheltenham expecting approval for four townhouses.
On paper, the numbers look excellent.
Then council planning feedback arrives.
A vegetation overlay restricts site coverage. Additional setbacks reduce building footprints. Visitor parking requirements remove usable area. Suddenly, the project drops from four dwellings to three.
That single reduction can wipe hundreds of thousands from projected profit.
“The cheapest mistake in development is the one you catch before settlement.”
The 3 Levels of Townhouse Development Feasibility
High-level feasibility: the first reality check
This is the quick screening stage developers use before spending money on consultants.
You review:
- Zoning
- Overlays
- Approximate yield
- Nearby townhouse sales
- Basic construction rates
- Potential resale values
At this point, assumptions are acceptable. The goal is simply determining whether the site deserves further investigation.
A good high-level feasibility can save months of wasted effort.
Static feasibility: refining the project numbers
Once the site passes the initial test, more accurate information starts entering the picture.
This usually involves:
- Preliminary architectural concepts
- Town planning advice
- Survey information
- Early engineering input
- Updated construction estimates
At MJS, we often identify costly design issues during this stage. Sometimes the fix is simple. Other times, the smartest financial move is walking away from the site entirely.
And honestly, that can be a huge win.
Cashflow feasibility: the final stress test
Cashflow feasibility is where projects either stand tall or wobble badly.
This stage examines:
- Loan structures
- Interest costs
- Construction drawdowns
- Timing risks
- Sales timing
- Holding costs
Banks rely heavily on this analysis before approving development finance.
| Feasibility Stage | Purpose | Accuracy Level |
| High-Level | Initial screening | Low |
| Static | Planning refinement | Medium |
| Cashflow | Finance and delivery testing | High |
The 6 Pillars That Decide Whether a Townhouse Project Works
Market demand matters more than ego
A beautiful townhouse development means very little if buyers will not pay your target price.
You need to understand:
- Buyer demographics
- Local demand
- Vacancy rates
- Comparable townhouse supply
- Absorption rates
For example, family buyers in Glen Iris often prioritise larger floorplans and second living spaces. Investor buyers in other suburbs may focus more heavily on rental yield and low maintenance.
Understanding your buyer changes everything from design layout to finish selections.
Site conditions can make or break your margin
Some sites look fantastic until construction starts.
Key issues include:
- Sloping land
- Easements
- Poor soil
- Limited access
- Drainage problems
- Existing service relocations
Here’s a simple early-stage checklist:
- Soil test completed
- Easements reviewed
- Stormwater checked
- Vehicle access confirmed
- Existing services located
- Demolition costs assessed
Skipping these checks is like building on sand.
Council regulations shape the entire project
Planning controls can dramatically affect yield and profitability.
In Melbourne, developers regularly face:
- Neighbourhood character overlays
- ResCode requirements
- Height restrictions
- Private open space rules
- Site coverage limits
- Car parking requirements
Every council interprets these slightly differently. A design that works in one municipality may struggle badly in another.
That local knowledge matters.
Breaking Down Townhouse Development Costs
Acquisition costs are only the beginning
Many developers underestimate the true cost of purchasing a site.
Typical acquisition costs include:
- Purchase price
- Stamp duty
- Legal fees
- Due diligence reports
- Settlement costs
By the time settlement occurs, the real entry cost is often far higher than expected.
Hard construction costs in 2026
Townhouse construction costs across Australia continue to fluctuate depending on specification, access, and site conditions.
Current turnkey construction rates for quality two-storey townhouses often range between $3,200 and $4,200 per square metre.
| Cost Category | Estimated Range |
| Demolition | $20,000–$50,000 |
| Construction | $3,200–$4,200/m² |
| Landscaping | $15,000–$40,000 |
| Driveways | $10,000–$30,000 |
These figures vary depending on finish level, engineering complexity, and council requirements.
Soft costs quietly eat into profit
Soft costs are less visible but equally important.
These often include:
- Architect fees
- Town planning
- Engineering
- Council contributions
- Finance interest
- Marketing
- Sales commissions
Across some Victorian councils, infrastructure contributions alone can become substantial on multi-dwelling projects.
Why contingency buffers are critical
No feasibility survives unchanged from start to finish.
Unexpected issues happen constantly:
- Material price increases
- Wet weather delays
- Engineering changes
- Latent site conditions
- Service authority delays
Experienced developers typically allow a 5–10% contingency buffer on hard construction costs.
“A feasibility without contingencies is wishful thinking.”
How Smart Developers Calculate Gross Realisation Value (GRV)
Comparable sales tell the real story
Online property estimates are rarely enough for accurate feasibility work.
Instead, developers should review:
- Recent townhouse sales
- Comparable floorplans
- Similar land sizes
- Matching finish levels
- Nearby competing projects
At MJS, we often review comparable projects within a few kilometres of the proposed site to assess realistic end values.
Conservative assumptions protect projects
Strong feasibility studies usually model three scenarios:
- Conservative
- Likely
- Optimistic
The conservative model is often the most important.
If the project barely survives under realistic downside conditions, the risk may outweigh the reward.
Common GRV mistakes
Developers frequently:
- Use outdated sales data
- Overestimate luxury premiums
- Ignore competing stock
- Assume peak market conditions continue forever
That approach can become dangerous very quickly.
The Financial Metrics Developers Watch Closely
Development margin explained simply
Development margin measures profit against total project cost.
For townhouse developments, lenders often prefer margins between 15% and 25%.
Margins below that level leave little room for unexpected problems.
Why IRR matters
Internal Rate of Return (IRR) measures how efficiently your money performs over time.
A faster approval process or quicker build can significantly improve IRR because holding costs reduce.
This is why experienced project management matters so much.
Key feasibility benchmarks
| KPI | Healthy Target |
| Development Margin | 15–25% |
| IRR | 15%+ |
| Contingency Buffer | 5–10% |
| Presales | Often 50–100% |
Sensitivity Analysis: Stress-Testing the Numbers
What happens if costs increase?
A proper feasibility model should answer difficult questions early.
For example:
- What if construction costs rise by 10%?
- What if council approval takes six months longer?
- What if sale prices soften by 5%?
These scenarios help developers understand how resilient the project really is.
Delays can quietly drain profits
Approval delays create:
- Extra loan interest
- Extended holding costs
- Delayed settlements
- Builder scheduling issues
One delayed permit can trigger a domino effect across the entire project timeline.
DA vs CDC: Choosing the Right Approval Pathway
Development Applications offer flexibility
Traditional Development Applications allow more design flexibility but usually take longer.
This pathway suits:
- Complex sites
- Larger developments
- Challenging overlays
- Non-standard designs
Across Melbourne councils, approval timeframes can vary significantly depending on workload and project complexity.
CDC approvals can reduce holding costs
Where suitable, fast-track approvals can save substantial time and finance costs.
However, strict compliance is essential.
Minor variations can quickly remove CDC eligibility.
| Approval Type | Typical Timeframe | Flexibility |
| DA | 2–6 months | High |
| CDC | 10–20 days | Lower |
Why Experienced Builders Improve Feasibility Outcomes
Builder input prevents expensive surprises
Builder-led feasibility advice provides practical insight that spreadsheets alone cannot deliver.
An experienced builder can identify:
- Expensive design inefficiencies
- Difficult access issues
- Structural complications
- Unrealistic budgets
- Buildability concerns
That experience becomes invaluable before contracts are signed.
How MJS Construction Group approaches townhouse feasibility
At MJS Construction Group, we approach feasibility conservatively.
After more than 35 years building across Melbourne, we know how quickly optimistic assumptions can unravel once planning, engineering, and site realities enter the picture.
That’s why we focus heavily on:
- Transparent budgeting
- Realistic construction pricing
- Practical layouts
- Council compliance
- Early consultant collaboration
Sometimes the best advice a builder can give is, “This site may not stack up.”
That honesty protects clients from expensive mistakes later.
Townhouse feasibility is not about chasing the biggest possible yield.
It’s about understanding risk, protecting capital, and making informed decisions before construction begins.
The strongest developers are not the ones who buy every site. They are the ones who know when to walk away.
A disciplined feasibility process helps you avoid emotional decisions, reduce financial risk, and approach your project with confidence.
Before purchasing any development site, make sure the numbers work under pressure — not just in perfect conditions.
Because in property development, hope is never a strategy.
