7 Things That Will Delay Your KDR Build (And How to Avoid Them)

A 14-month build that takes 22 months. That's not unusual — it's actually fairly common. And the consequences are real: rent costs, living disruption, holding costs on your loan. Here are the seven most common causes of KDR delay, and what you can do about each.

1. DA Approval Longer Than Expected

Councils routinely take longer than their published timeframes. Sydney metropolitan councils average 70–100+ days for DA determination, despite a 40-day statutory target. Heritage and complex sites can take 6–12 months.

Fix: Start the DA process as early as possible. Consider a complying development certificate (CDC) where the project qualifies — CDCs are assessed by private certifiers and typically take 10–20 days. Engage a town planner who knows your council's requirements to avoid requests for additional information (RAIs) that pause the clock.

2. Engineering and Soil Issues

Reactive clay soil, underground water, old drainage infrastructure, or unexpected rock — these are discovered after demolition and can add $20,000–$80,000 in costs and 4–8 weeks of delay.

Fix: Commission a geotechnical report before finalising your design and builder contract. It costs $1,500–$3,000 and can save multiples of that in surprises.

3. Builder Capacity Problems

The builder wins your job, then assigns an inexperienced site supervisor. Or they take on too many projects. Result: slow responses, long gaps between trades, poor coordination.

Fix: Ask specifically who will be your site supervisor and how many active sites they're managing. Ask to speak to two or three recent clients before signing. Check that the builder's contract has a liquidated damages clause for delays.

4. Variations and Scope Creep

Changing your mind mid-build is the single biggest controllable cause of delay. A variation for a bathroom relocation can set back the frame by three weeks — each trade needs to be rescheduled.

Fix: Make all decisions before signing the contract. Walk through a display home, review every fixture and fitting selection. Changes after contract signing cost double what they would have cost in the design phase.

5. Trade Availability

In 2026, experienced concreters, electricians, and tilers are still in high demand. A builder who doesn't have strong trade relationships may find themselves waiting weeks for key trades.

Fix: Ask your builder about their trade relationships during the tender process. Builders with high-volume programs tend to have more reliable trade access. Look for builders who employ some trades directly (like their own concreters) rather than relying entirely on subcontractors.

6. Neighbour and Authority Disputes

Disputes about property boundaries, boundary fencing, tree removal, or dust and noise complaints can result in stop-work orders or significant neighbour negotiation delays.

Fix: Commission a surveyor to identify boundary pegs before demolition. Communicate proactively with neighbours about the build timeline. Ensure your builder has a clear dust and waste management plan.

7. Defects and Rework

Nothing delays a build like having to redo work. Frame shrinkage, waterproofing failure, and tiling on uneven surfaces are common rework triggers.

Fix: Appoint an independent building inspector at key stages (frame, pre-plaster, practical completion). It costs $600–$1,200 per inspection but catches problems when they're still cheap to fix.