Contents
6–12 months, stage by stage
A new single-family house typically takes 6–12 months to build and finish, and the structural shell — foundation to roof — accounts for the first 8–16 weeks. Everything after that is services, interior fit-out and snagging, each with its own standard dimensions and acceptance tests. This guide lays out the full sequence with realistic durations.
Plan on 6–12 months in total, with the structural shell taking the first 8–16 weeks.
The 6–12 month envelope covers everything from breaking ground to handing over keys. It is a range rather than a promise: weather, ground conditions and design changes push real programmes toward the upper end, while a simple, well-prepared build can finish closer to six months.
The anchor of the programme is the structural shell — foundations, load-bearing walls, floors and roof — which typically takes 8–16 weeks. That stage is paced by concrete, which reaches only about 70% of its design strength at 7 days and needs 28 days to reach 100%.
The remaining months belong to services, interior fit-out and snagging. These stages look quicker on a chart but are gated by tests and curing: a failed pressure test or a prematurely loaded slab can hand back weeks that were never in the plan.
The shell is the only stage with a hard chemical clock: concrete cures on its own schedule.
Within the shell, slab formwork is usually stripped after 7–14 days — never before the concrete has reached roughly 70% of its design strength at the 7-day mark. Striking earlier risks cracking and deflection that no later stage can repair cheaply.
Full design strength arrives at 28 days. Loads that assume the finished structure — stacked materials, heavy plant, upper-storey work — should respect that milestone even when the programme is tight.
Once the roof is on, the building is weathertight and the character of the job changes. Work moves indoors, trades overlap, and durations depend less on chemistry and more on sequencing: who can start, and what must be tested before walls close.
Six ordered stages take a house from open ground to handover — each with its own duration and its own typical failure.
The order is not negotiable, because each stage gates the next. Foundations gate the shell, the shell gates first fix, first-fix tests gate the partitions, and only tested, closed walls can be painted.
Read together with the stage-by-stage timeline and the fit-out dimensions guide, this sequence is the whole answer to how long a house takes: 6–12 months, spent in this order.
Of a 6–12 month build, only 8–16 weeks are structure — the rest is services, fit-out and the discipline of testing before closing walls.
A snag list of 10–30 items is not a failure; it is the normal final step between practical completion and handover.
| What is measured | Standard figure | Why it matters |
|---|---|---|
| Total build, single-family house | 6–12 months | The full programme from site preparation to handover |
| Structural shell, foundation to roof | 8–16 weeks | Anchors the front of the programme |
| Concrete strength at 7 days | ~70% of design | Earliest point for stripping slab formwork |
| Concrete strength at 28 days | 100% of design | Full load capacity of the structure |
| Finished partition thickness | 95–125 mm | Sets room sizes and corridor widths |
| Interior door leaf | 800–900 × 2,040 mm | Hung in a 900–1,000 mm rough opening |
| Kitchen worktop height | 850–920 mm | Fixes socket, plumbing and cabinet heights |
| Snag list clearance | 2–4 weeks | Closes the build after practical completion |
Fit-out dimensions are standardised, so rooms can be planned before a single board is cut.
Internal partitions are commonly built from 70–100 mm metal studs with 12.5 mm gypsum board on each side, giving a finished wall thickness of 95–125 mm. That number decides how wide corridors feel and where door linings sit.
A standard interior door leaf is 800–900 mm wide and 2,040 mm high, hung in a rough opening of 900–1,000 mm. The opening is set during the shell and partition stages, long before the leaf arrives.
In the kitchen, base cabinets are 600 mm deep with the worktop at 850–920 mm and the splashback 450–600 mm above the worktop. These three figures fix the heights for sockets, plumbing and wall cabinets in one pass.
Electrical and plumbing work is sized by standard and accepted by test, not by appearance.
These figures matter to the timeline because they are gates. A pressure test that shows any drop within 15 minutes fails, and the leak must be found and repaired before partitions are closed and finishes begin.
Cable sizing works the same way: a socket circuit on 2.5 mm² copper with a 16–20 A breaker is a standard, not a suggestion, and second fix cannot proceed until first fix is tested and signed off.
The figures reflect commonly published industry standards and manufacturer data rather than any one builder's project record.