How long a build takes, stage by stage

Every builder quotes a build time. Very few builds finish in it. That is not always the builder's fault — most of the delay in Australian residential construction happens before a single trade turns up.

Before site start

Design and documentation. Drawings, engineering, energy rating. Longer for a custom home than a plan from a range.

Approvals. The single most variable stage. A straightforward estate lot can be a building permit alone. An overlay-affected block may need a planning permit, a heritage assessment, a bushfire report and a neighbour notification period. This is where months go.

Titles, on a new estate. You cannot start on land that does not exist yet, and the date is the developer's, not the builder's.

On site

Site preparation and footings, then slab. Frame goes up fast and feels like enormous progress. Roof and lock-up — windows, doors, external cladding. Then the long middle: services rough-in, insulation, plasterboard. Then fit-off — joinery, tiling, painting, tapware, appliances. Then practical completion and handover.

The frame is the trap. It goes up in days and looks nearly done. The work after lock-up is most of the build and almost none of the visible progress.

What actually controls the timeline

Variations. Every change re-sequences the trades behind it. A change at fit-off stage costs far more time than the work itself.

Selections. Late decisions on tiles, tapware and joinery stall the trades waiting on them. Make them early, in one go.

Weather and trades. Real, but frequently blamed for delays that were caused by the two things above.

What to ask

Ask for the build programme by stage, not a single number. Ask what happens if it is exceeded — whether liquidated damages apply and at what rate. And ask how many jobs the site supervisor is running at once, because that answer predicts more than the programme does.

The clock usually starts later than you think

A build time quoted by a builder almost always runs from site start, not from the day you sign. Ahead of site start sit design, engineering, soil classification, approval, and on a new estate the registration of titles. That front section is frequently longer than the construction itself and it is the part with the least visible progress. See registered and unregistered land.

What extends a programme

Decisions. Colour and fixture selections that arrive late stop the sequence at exactly the point where several trades are queued behind each other. This is the most common cause and the one entirely within your control.

Variations. A change approved mid-stage can push a trade out of its slot, and the next slot may be weeks later rather than days. The cost of a variation in time is routinely larger than its cost in money.

Inspections and certification. Mandatory hold points depend on a third party's availability, not the builder's.

Weather at the wrong stage. Rain matters enormously before the slab and during roofing, and barely at all during fixing.

Trade and material availability. Outside anyone's control on site, and worth asking about specifically for anything imported or made to order.

Extensions of time

Building contracts allow the builder to claim extensions for defined causes — commonly weather, variations, and delays caused by the owner or an authority. The claim process and notice periods are in the contract. Read that clause before you need it, and keep your own dated record of when selections and approvals were provided; if a delay is ever disputed, that record is the evidence.

A realistic way to plan

Take the builder's programme, add the pre-construction phase honestly, and do not commit to a lease ending or a settlement date on the optimistic reading of either. The cost of a build running long is mostly the cost of living somewhere else while it does.