Why Most Property Development Feasibilities Are Wrong (And How to Get Them Right)

Every successful development starts with a feasibility.

But here’s the uncomfortable truth: Most property development feasibilities are wrong.

Not because developers aren’t capable—but because the feasibility is often treated as a formality rather than a critical decision-making tool.

Too many projects are based on optimistic assumptions, incomplete data, and unrealistic timelines—only to run into cost blowouts, delays, and reduced profits down the track.

If you want to succeed in development, getting your feasibility right isn’t optional—it’s non-negotiable.

Why Most Property Development Feasibilities Fail

Costs Are Consistently Underestimated

One of the biggest issues in any property development feasibility is failing to account for the full cost of a project.

It’s not just construction—developers often overlook:

• Site preparation and remediation

• Infrastructure upgrades (power, sewer, water)

• Consultant and approval costs

• Holding costs (interest, rates, land tax)

• GST and transaction expenses

These “hidden” costs can significantly impact your bottom line and are often the reason projects fall apart.

Revenue Is Overestimated

Many feasibilities rely on best-case sales outcomes.

This includes:

• Assuming peak market prices

• Ignoring potential oversupply

• Overestimating buyer demand

Markets change—and quickly.

A feasibility based on optimistic sales figures creates a false sense of security.

Timeframes Are Unrealistic

Time is one of the most underestimated risks in development.

Feasibilities often assume:

• Smooth DA approvals

• Immediate construction commencement

• No delays

In reality, delays are common—and expensive.

Longer timeframes mean increased holding costs, extended financing, and reduced profit.

Lack of Proper Contingency

Even well-managed projects face unexpected issues.

Yet many developers fail to include a sufficient contingency buffer.

A realistic approach is: 10–15% contingency across both construction and soft costs

Without this, even minor variations can create major financial stress.

Poor Market Understanding

A feasibility is only as strong as the market it’s based on.

Developers who don’t properly assess:

• Buyer demographics

• Local demand

• Comparable sales

• Competing developments

Often deliver the wrong product.

As industry insights consistently show, misunderstanding the market is a leading cause of development failure

Just because you can build something doesn’t mean it will sell.

How to Get Your Feasibility Right

Take a Conservative Approach

Experienced developers don’t rely on best-case scenarios.

Instead, they:

• Reduce expected sale prices

• Increase cost assumptions

• Allow for longer timeframes

If a project still works under conservative assumptions, it’s far more robust.

Complete Thorough Due Diligence

The best time to identify risk is before you purchase the site.

This includes:

• Reviewing zoning and planning controls

• Identifying easements and constraints

• Checking flood, bushfire, or environmental overlays

• Confirming service connections

The goal is to eliminate unknowns early.

Use Accurate, Expert Inputs

Relying on rough estimates or generic rates can lead to major errors.

A strong feasibility should be supported by:

• Quantity Surveyor cost estimates

• Real, current comparable sales

• Planning advice based on local controls

Accurate inputs = accurate outcomes.

Treat Feasibility as a Living Document

A feasibility isn’t something you prepare once and forget.

It should be updated throughout the project as:

• Costs change

• Designs evolve

• Market conditions shift

Tracking performance against your feasibility helps you identify issues early and stay in control.

Manage Risk from the Start

The earlier risks are addressed, the more control you have over the outcome.

This may include:

• Locking in fixed-price construction contracts

• Finalising design decisions early

• Structuring projects to manage cash flow

• Considering pre-sales where appropriate

Feasibility is not just about numbers—it’s about strategy.

How OwnerDeveloper Can Help

At OwnerDeveloper, we specialise in preparing detailed, accurate property development feasibilities that go beyond surface-level assumptions.

We understand that your feasibility is the foundation of your entire project—and getting it wrong can be costly.

Our team provides:

• Comprehensive feasibility modelling

• Detailed cost identification (including hidden costs)

• Market-driven revenue analysis

• Risk and sensitivity testing

• Ongoing feasibility updates as your project evolves

Whether you’re assessing a potential site or refining an existing project, we help you understand what is truly feasible—not just what looks good on paper.

Because the right feasibility doesn’t just guide your project—it protects your profit.

Final Thoughts

Most development projects don’t fail during construction—

They fail at the feasibility stage.

The developers who consistently succeed are those who:

✔ Take a conservative approach

✔ Understand their market

✔ Identify risks early

✔ Continuously refine their numbers

Because in property development, success isn’t about guessing—it’s about getting the fundamentals right from the beginning.

Frequently Asked Questions

What is a property development feasibility?

A property development feasibility is a financial and strategic assessment used to determine whether a project is viable and profitable.

Why are most feasibilities wrong?

Most are based on optimistic assumptions, underestimated costs, and incomplete data, which leads to inaccurate projections.

What costs are often missed in a feasibility?

Commonly missed costs include holding costs, infrastructure upgrades, consultant fees, GST, and site-related expenses.

How much contingency should I include?

A contingency of around 10–15% is typically recommended to account for unexpected costs.

Should I update my feasibility during the project?

Yes. A feasibility should be treated as a live document and updated as costs, timelines, and market conditions change.

Can OwnerDeveloper help with feasibility studies?

Yes. OwnerDeveloper provides detailed feasibility assessments, helping developers, investors, and homeowners understand project viability and reduce risk before committing.

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