The Feasibility Mistake That Hides in Your Project Timeline

A feasibility can contain careful cost estimates and still be dangerously optimistic because every stage begins on time. Approval arrives, finance converts, construction starts and sales settle as though one clean calendar controls them all.

Time is not a note under the numbers. It drives interest, rates, insurance, rent loss, consultant remobilisation and the date revenue becomes available.

Build a linked timeline

Map acquisition, investigations, design, approvals, finance conditions, procurement, construction, certification, sales and settlement. Show dependencies: the task that cannot start until another finishes. Planning pathways and information needs differ by proposal and authority; NSW guidance, for example, says site characteristics and controls determine development potential and that complete information can improve efficiency without guaranteeing approval.

Run the CLOCK test

1. Critical path: identify tasks that directly move the exit date.
2. Lag: add realistic waiting periods between decisions, appointments and mobilisation.
3. Overrun: test a plausible delay at approval, build and sale stages.
4. Cash: calculate monthly holding and finance effects, including when drawdowns change.
5. Kill point: decide when delay requires redesign, repricing, extra capital or an alternate exit.

A clearly labelled hypothetical

A base case assumes an 18-month project. Monthly land interest, rates, insurance and administration average $9,000. A four-month approval delay adds a simplified $36,000 before considering changed construction pricing or revenue timing. If the original margin could not absorb that scenario, the project was relying on punctuality rather than carrying risk.

Do not use one blanket contingency

Separate schedule contingency from cost contingency. Ask your planner, designer, builder, broker and certifier which dependencies are within their control and which are authority or market dependent. Update the forecast when evidence changes. A date from a preliminary conversation is an assumption, not an approval or contractual commitment.

Think Property Club’s System connects programme gates to feasibility updates; Specialists improve the basis of the durations; Strategies provide alternatives if the planned exit date moves.

Your next action

Add one column to your feasibility for start date, finish date, dependency and monthly cash effect. Then move the three most uncertain milestones and inspect the funding peak and return.

Key Takeaway

A conservative feasibility prices not only what the project consumes, but how long capital remains exposed before the exit can occur.

Your Turn

Which milestone in your current feasibility has the weakest evidence, and what does a three-month delay do to cash required and your exit?

Continue learning

• Feasibility sensitivity testing
• Holding costs

Sources and boundaries

1. NSW Planning, Stage 1 – Pre-lodgement (updated 23 May 2025; accessed 5 September 2026)
2. Australian Government, Make a risk management plan (current page; accessed 5 September 2026)

This article is general education, not personalised planning, legal, financial, tax or building advice. Requirements and outcomes vary by jurisdiction, site, contract, structure and circumstances. Check current information with the relevant authority and appropriately qualified advisers.