The Budget Blowouts That Destroy Property Developments

https://www.youtube.com/watch?v=oNffDUOujX4

Most property development projects don’t fail because the idea was bad. They fail because the numbers were wrong.

The biggest reason? People underestimate the real costs in property development. In this episode, Claire, head of projects at Little Fish, breaks down exactly where budgets go off the rails, and what experienced developers do differently. Hit play above to watch the full breakdown.

What Costs Do Beginners Consistently Underestimate?

Four costs catch beginners out more than anything else: holding costs, soft costs, council and authority fees, and contingency.

Holding costs go beyond loan interest. They include rates, insurance, land tax, and accountant fees that quietly stack up over months. Most beginners budget for the build timeline but forget about settlement periods, sales campaigns, and finance establishment fees.

Soft costs are the consultant fees during design and planning. Architects and engineers are obvious. But accountants, legal fees, and conveyancing costs sit in this bucket too, and they’re easy to overlook because they don’t feel like “development” costs.

Council and authority fees are tricky because they can change mid-project. A quote for an electrical pit or infrastructure contribution might only be valid for three months. So even solid research at the start can be out of date by the time you need to pay.

That’s why contingency matters so much. It exists to catch the movement in those other three categories.

What Are the Biggest Cost Blowouts That Destroy Budgets?

Construction variations and prolonged timelines are the two biggest budget killers.

Client-driven changes during the build are expensive. A simple wall light added at plaster stage doesn’t just cost for the electrician. It pulls in the plasterer and the painter too. Builders price variations higher because they disrupt the program, and that premium is justified.

The second blowout is time. Every extra week on a project means more holding costs, more consultant invoices, and more fees dripping out. Even cash buyers aren’t immune. Councils are taking longer to respond, and those delays to your development add up fast. The key is to control every part of the timeline you can, because someone else will always be looking to take time from you.

What Systems Do Experienced Developers Use to Control Costs?

Three systems make the biggest difference: a conservative feasibility, tight document control, and a fixed price building contract.

Your feasibility is only as good as the numbers in it. Experienced developers build theirs conservatively, not with hope. They also revisit and update feasibilities at key milestones so contingency reflects actual types of risks in property development, not a blanket percentage.

Document control means every drawing, report, and specification is listed on a transmittal before it goes to the builder. This removes any excuse for missed scope. If you’re unsure whether the builder needs a document, send it. They’ll tell you if they don’t.

A fixed price contract locks your biggest cost line item in place. It means your feasibility stays stable through construction and you’re not reviewing every trade price as you go. Your townhouse builder carries the risk of cost movement within the contract, which gives you the certainty you need to manage your margins.

Key takeaways from this episode:

• Holding costs, soft costs, and council fees are the three categories beginners underestimate most.
• Contingency should be spread across project stages and reduced as risk is removed.
• Client-driven variations during construction are the single biggest budget blowout.
• A fixed price contract and tight documentation are your best protection against cost overruns.

Budget blowouts rarely come from one big surprise. They come from a dozen small oversights that compound. In fact, poor cost control and unrealistic feasibilities are a major reason why property development fails for inexperienced developers. Get your feasibility right, lock your contracts down, and treat every dollar like it matters, because it does.