New Build Plumbing in Main Beach

Most new coastal builds we work on are either knock-down rebuilds on the old beach-cottage blocks or substantial renovations that effectively gut everything back to slab. Either way, the plumbing scope is the same as any new build (drainage, water service, gas rough-in, fit-off) plus a layer of salt-air thinking that nobody in an inland suburb has to do.

What changes on a coastal new build versus inland:

• External tapware, hose bibs and rainwater fittings go up a grade. We push for 316 stainless or marine-grade brass on anything exposed to the easterlies, not the standard chrome-plated brass we install everywhere else.
• Hot water unit placement matters. Mounting a standard gas continuous flow unit on an east or north-east wall, 800 m from the surf, will eat its galvanised case in under 10 years. We push for a sheltered north-west or south wall, or a recessed enclosure.
• Copper water service that runs along external walls gets sleeved properly. Salt-laden moisture trapped against unsleeved copper accelerates pinhole failures.
• Water pressure on a lot of the beach strips runs hot, 700-900 kPa is common. Pressure limit valves (required by AS3500 anyway) get checked properly at commissioning.
• We coordinate with the carpenter on the rainwater tank install if there is one, beach lots tend to be narrow and the tank goes wherever it physically fits, not always where the plan says.

Typical scope on a coastal new build: pre-slab set-out and drainage, through-slab penetrations, sewer connection to council mains (almost always available in coastal suburbs), water service from meter with pressure-limit valve, gas rough-in to cooktop and hot water (natural gas typical on the coast), full hot and cold water rough-in to bathrooms / kitchen / laundry / outdoor, hot water system supply and install, fit-off of all tapware after waterproofing and tiling, hydrostatic testing, QBCC Form 4 plumbing compliance, gas compliance certificate, full as-built drawings.

What we install on coastal builds: we lean toward Phoenix Vivid and Sussex Voda ranges for tapware because they hold up well; Rinnai Infinity gas continuous flow units mounted on sheltered walls; Caroma Cube or Liano suites; high-grade silicone on every external penetration. We will quote a cheaper spec if the client wants it, but on a build that is going to live 50 m from the surf, we will write down in the quote that we recommended otherwise.

Timing: a typical 4-bedroom coastal new build runs across 5-7 site visits over 4-6 months from slab to handover, depending on the rest of the trades.

Realistic 2026 ranges for a new build in a coastal Gold Coast suburb, slab-to-handover plumbing only (not tiling, not waterproofing, not electrics):

• Production-style 4-bed beachside build (mid-spec): $18,000-26,000
• Custom 4-bed coastal build with marine-grade external fittings and gas continuous flow: $26,000-38,000
• Premium coastal build (Phoenix / Sussex tapware, freestanding bath, outdoor shower, recessed hot water enclosure): $38,000-58,000+

Coastal lots tend to be narrow and tight, which makes excavation and drainage trickier than a standard suburban block, expect a slight premium on excavation. Conversely, council mains are universally available so there is no septic or rainwater tank cost like on the hinterland builds. Fixture upgrade for salt-tolerant spec is usually $2,000-5,000 across the whole build, which we recommend almost every coastal client take.