How Long Will My New Home Take to Build? Queensland Build-Time Calculator

The calculator uses two industry-standard baselines that cover the vast majority of Queensland residential new builds. A low-set single-storey home on a slab — the most common Queensland build — typically reaches practical completion around 20 weeks (140 calendar days) from the start of construction. A high-set, two-storey, split-level or raised home typically takes around 160 business days, or ~32 weeks calendar (224 calendar days). Both baselines assume a clean lot, standard inclusions, no major variations or weather delays, and a builder running a typical SEQ programme.

A small modifier is applied for home size: each 10m² above 200m² adds roughly one calendar day, reflecting the additional fit-out work on larger homes. The calculator also detects what stage your build is likely in based on weeks elapsed since construction started, and compares that against the stage you reported on site to raise a risk flag if the two diverge meaningfully.

What the calculator cannot predict: weather delays, supply chain issues, council inspection backlogs, custom variations, or the lender's processing speed at final payment. Your contract date is the legal reference. The calculator gives you a working estimate.

Stage 1 — Pre-pour and slab (Weeks 1-3 low-set, Weeks 1-5 high-set). Site set-out, footings, formwork, reinforcement, termite management system per AS 3660.1, and the slab pour itself. AS 2870 governs slab design for reactive soils — important across most of South East Queensland's growth corridors. An independent pre-pour inspection at $550 verifies the formwork, reinforcement and termite system before the concrete locks them in permanently.

Stage 2 — Frame (Weeks 3-8 low-set, Weeks 5-13 high-set). The timber skeleton goes up. Wall frames, roof trusses, tie-down connections, bracing per AS 1684 and the engineer's design. Frame stage is the second-highest-leverage stage inspection on any build — once plasterboard goes on, the structure is invisible for the life of the home. A frame inspection at $550 verifies member sizing, tie-down completeness, bracing patterns and service penetrations before linings cover everything.

Stage 3 — Enclosed / lock-up (Weeks 8-14 low-set, Weeks 13-21 high-set). Cladding, roof covering, windows installed, external doors, articulation joints, flashings per NCC Volume 2 Part 3.5, weep holes. The home is sealed against the weather. An enclosed (lock-up) inspection at $550 verifies the weatherproofing before facade finishes go on.

Stage 4 — Waterproofing (within enclosed phase). The single highest-leverage stage inspection on any new build. Wet-area waterproofing membranes per AS 3740 go down in showers, bathrooms, laundries and balconies. The membrane is invisible after tiles go down. A waterproofing-stage inspection at $550 verifies membrane continuity, upturn heights and integrity at every penetration BEFORE tiles cover everything.

Stage 5 — Fixings and finishing (Weeks 14-19 low-set, Weeks 21-30 high-set). The final fit-out — internal joinery, tiling, paint, fixtures, electrical, plumbing, kitchen, bathroom, floor coverings. The most variable stage in terms of timing; last-minute supplier issues, custom variations and trade availability typically cause delays here.

Stage 6 — Practical completion and handover (Weeks 19-20 low-set, Weeks 30-32 high-set). Your builder declares practical completion. The PC-to-handover process runs typically 7 to 28 days — buyer PCI inspection, defect rectification, certifier Form 21, lender final payment, physical handover. The PCI / handover inspection at $660 is the most-booked inspection at VG Inspect — the last independent check before you accept the keys. After handover, the statutory 12-month defect liability period begins. We recommend the 11-month warranty inspection at $550 before that window closes.

Several factors commonly extend the calculator's baseline estimate. Weather — Queensland's wet season (November to April) and storm events can delay slab pours, frame stages and enclosed phases. Supply chain — imported fixtures, custom joinery and specialty materials can extend the fixings phase by weeks. Custom variations — each mid-build variation typically adds 1-2 weeks. Council inspections and certifier availability — each mandatory inspection requires the certifier to attend, and backlogs add days at each stage. Rectification cycles — if a stage inspection identifies items requiring rectification, the trades return and the next stage is delayed accordingly. Lender processing — at the final stage, your lender's processing speed for the final progress payment affects handover timing. Add 2-4 weeks to the estimated PC date if you have had multiple variations, weather delays or supply issues.