The total elapsed time of the plumbing scope on a new build runs months, not weeks, because the plumbing work is distributed across the build at specific stages (pre-slab, post-frame, pre-sheet, fit-off) with weeks of other trades' work in between. The actual hands-on-tools plumbing time is much shorter than the elapsed timeline suggests.
The standard timeline for a 4-bedroom suburban new build
- Month 1 (week 1-2): Pre-slab set-out, drainage, sewer connection. 3-5 days on-site.
- Month 1-2: Slab pour, frame construction (other trades).
- Month 2-3: Post-frame rough-in. Hot and cold water lines, drainage, gas lines, HWU rough-in. 5-8 days on-site over 1-2 weeks.
- Month 3-4: Plastering, waterproofing, tiling, cabinetry (other trades).
- Month 4-5: Pre-sheet pressure test (half day). Then waiting for waterproofing and tiling.
- Month 5-6: Fit-off. Tapware, basin, toilet, shower, bath, HWU connection, gas appliance connection. 4-7 days on-site over 1-2 weeks.
- Month 6: Final commissioning and compliance certification. 1-2 days on-site.
Total elapsed time, 4-6 months from pre-slab to handover. Total plumbing days on-site, 13-22 days.
The acreage timeline (5-8 months)
Acreage builds run longer because of additional systems:
- Tank install, pump install, pressure tank install (adds 2-4 days at appropriate stage)
- Septic or AWTS install with council inspection (adds 2-5 days, plus council scheduling)
- LPG bottle service install with compliance (adds 1-2 days)
- Long internal mains runs (adds 1-3 days)
- Outbuilding plumbing if applicable (varies)
Total plumbing days on acreage, 18-30 days across 5-8 months.
The apartment fit-out timeline (3-5 months)
Apartment new-unit fit-outs are different because the building shell is already built:
- Body corp approval before starting (2-6 weeks)
- Strip-out (1-2 weeks, if applicable)
- Plumbing rough-in (1-2 weeks)
- Waterproofing, tiling, joinery, electrical (4-8 weeks)
- Plumbing fit-off (1-2 weeks)
- Final commissioning and body corp sign-off (1 week)
Total elapsed time 3-5 months for a typical apartment full fit-out, plumbing days 10-15.
The five plumbing site visits in detail
Visit 1, pre-slab (1-3 days, weeks 1-2)
- Read plans and set out every wet-area drain
- Mark through-slab penetrations
- Lay drainage to AS3500 minimum fall
- Connect sewer to council main or run to septic / AWTS
- Council plumbing inspector signs off before slab pour
Visit 2, post-frame rough-in (5-8 days, weeks 8-12)
- Run hot and cold water lines to every fixture position
- Install isolation valves at fixtures and main entries
- Install pressure-limiting valve at meter
- Run gas lines (if gas in scope)
- Position HWU and run supply lines
- Set up shower hobs, niches in coordination with tiler
Visit 3, pre-sheet pressure test (half day, week 14-16)
- Pressure-test the entire rough-in
- Confirm no leaks before plasterer closes walls
- Document for compliance pack
Visit 4, fit-off (4-7 days, weeks 18-22)
- After waterproofing cure, tiling, and joinery complete
- Install all tapware (mixers, basin tap, shower set, bath spout)
- Install basin, toilet, shower screen waste, bath
- Connect HWU, commission
- Connect gas appliances, leak-test, gas compliance certificate
- Test every fixture
Visit 5, final commissioning and certification (1-2 days, week 22-24)
- Hydrostatic test final, full system
- Walk-through with the builder or owner-builder
- QBCC Form 4 plumbing compliance certificate issued
- Gas compliance certificate issued for every gas appliance
- As-built drawings finalised
- HWU warranty registered in your name
- Hand over compliance pack as PDF to certifier
What can delay the plumbing timeline
- Slab pour delayed (slab is gated on plumbing pre-slab being inspected, then plumbing is gated on slab being ready)
- Frame construction delayed (rough-in cannot start)
- Waterproofing cure issues (fit-off cannot start until tiling complete)
- Tile delivery delays (tiles needed before plumbing fit-off)
- Tapware or fixture delivery delays (premium brands can be 4-8 weeks)
- Council inspection scheduling (sometimes 1-2 week lead time)
- Body corp approval delays in apartments
How to keep the timeline tight
- Lock the architectural plans before pre-slab. Late layout changes are expensive.
- Order all premium fixtures at planning stage so they arrive in time for fit-off.
- Coordinate with other trades on shared milestones (we are happy to help your builder schedule).
- Book council inspections in advance, not at the last minute.
- Maintain clear communication with us so we can attend on the dates needed.
Why the wet weather window matters on the Gold Coast
Gold Coast new builds are heavily affected by wet weather, and plumbing is one of the trades that loses the most days to rain. Pre-slab drainage works are particularly vulnerable, an open trench fills with water in a serious afternoon storm, the bedding washes out, and we have to dewater and re-prepare before the inspector will pass it. If you are planning a build start in December through March (peak wet season) build in 2 to 4 extra weeks of weather contingency on the pre-slab phase alone. The 2022 wet season delayed two of our Mount Nathan acreage builds by 7 and 11 weeks respectively, almost entirely from drainage and septic field saturation. Conversely, May through September is the dry window and pre-slab work runs to schedule almost every year. If you have flexibility on build start timing and you live on acreage with extensive drainage runs, starting in April or May puts the pre-slab and rough-in stages in the dry months and the fit-off stage in the early summer when premium fixtures have arrived from suppliers. Builders who do their own scheduling usually know this, owner-builders frequently miss it and end up fighting weather they could have avoided. Even on standard suburban Robina or Pacific Pines builds, a wet pre-slab can delay slab pour by a week, which delays frame by a week, which delays our rough-in by a week, which delays plaster, waterproof, tile and our fit-off. One week lost early becomes 4 to 6 weeks lost by handover.
Tapware lead times have blown out, plan for it
Premium tapware lead times since 2023 have been brutal and the pattern is still in place in 2026. Brodware ex-factory is 8 to 14 weeks for most ranges. Astra Walker can be 10 to 16 weeks for premium finishes. Sussex Voda matt black or brushed brass runs 6 to 12 weeks. Even mid-range Phoenix and Methven are 4 to 8 weeks for less common finishes. A Burleigh client of ours in 2025 selected Brodware Yokato in graphite at month 3 of their build and the tapware did not arrive until month 8, delaying fit-off by 7 weeks because we could not commission without it. The lesson, lock fixture selections before pre-slab and order at slab pour, not at lock-up. We provide a fixture order list at quote stage with realistic 2026 lead times so you can place orders early. Cheaper option is to specify standard chrome from Methven, Caroma or Posh, all stocked locally at Reece and Tradelink, lead time 2 to 5 days. If you want premium finishes, order early and accept the timing. We will not start fit-off until every tap, basin, toilet and shower fitting is on site, because half-completed fit-off creates re-mobilisation cost and stages out of sequence cause cascading issues. The 10 minute conversation at quote stage about tapware lead times saves owners a month of build delay surprisingly often.
Council inspection scheduling, the hidden delay
Gold Coast City Council and the private certifier inspections drive a chunk of build scheduling that owner-builders frequently underestimate. Pre-slab drainage inspection is a council plumbing inspector booking, usually 5 to 10 working days lead time. If you book it Friday afternoon for the following Monday, you will not get it. Septic and AWTS inspections on acreage builds run longer, 2 to 4 weeks in the busy period. Gas compliance inspections by the gas inspectorate are typically not site visits (we lodge the paperwork) but the certificate issuance takes 5 to 15 working days. Backflow installation inspections (required for any irrigation, pool top-up or rainwater-to-mains connection) are another booking cycle. If you stack 4 or 5 inspections across the build and each adds a week of waiting, that is a month of elapsed time inside the headline build timeline. We book all our council inspections as soon as we have a date for the work, often 2 to 3 weeks ahead, and we keep an inspections diary so the build never waits on a missed booking. Owner-builders managing this themselves should set calendar reminders 3 weeks before each inspection trigger point. The Bonogin acreage build we did in 2024 had to redo a septic field set-out because the owner did not book the council inspector in time, the trench sat open for 8 days and partly collapsed in a storm, costing roughly $2,800 to remediate. Cheap problem to avoid with one phone call.
Speed-up options when the schedule slips
If the build is slipping and the bank or the owner-builder wants to claw time back on the plumbing scope, there are three levers we can pull. First, run rough-in and frame coordination concurrently rather than sequentially. Most builders have the framer finish completely then bring the plumber in, but we can rough in alongside the framer if the framer is willing to mark up wall positions early and let us thread between studs. Saves 4 to 8 working days on a typical 4-bed build. Second, pre-fabricate hot water and gas manifolds off-site. Our workshop in the southern Gold Coast assembles HWU manifolds, pressure-limit valve assemblies, and gas distribution headers as complete units that bolt in during rough-in. Saves 1 to 2 days on-site at each stage and the workmanship is more consistent. Third, split fit-off across two crews if scope warrants. On a 4-bathroom Mudgeeraba build we did in 2025 we ran two licensed plumbers in parallel during fit-off week, halving elapsed time at that stage. Costs more per day but compresses the schedule. None of these compress drying or curing times, waterproofing still needs its 3 to 7 day cure, tile adhesive still needs its set time, and AS3500 hydrostatic test holds are still mandatory. But where there is genuine slack in the trade coordination, we can compress it. Worth a conversation if you are running 6 weeks behind and trying to hit a settlement deadline or a Christmas occupancy. We also flag that compression has compounding cost, second crew adds $1,500 to $3,500 per day, pre-fab manifolds add $400 to $900 to the scope, and concurrent rough-in needs the framer to charge a small premium for the extra coordination time. Worth it when the build is genuinely time-critical, not worth it for a 1 to 2 week slip that does not threaten settlement or other downstream costs.