The plumber is involved at two key stages of a bathroom renovation — the rough-in (first
fix) before waterproofing and tiling, and the fit-off (second fix) after. In East Gosford's
older homes, expect the plumber to also deal with legacy plumbing uncovered during strip-out.
Rough-in (first fix) relocate/install drainage, water supply, waste
points
1–2
days
Fit-off (second fix) connect toilet, vanity, taps, shower mixer,
bath
1 day
Waterproofing coordination plumber preps, waterproofer applies membrane
Critical
step
Legacy pipe replacement galvanised supply & old drainage found during
demo
Common in East
Gosford
Bathroom waterproofing in NSW must comply with AS 3740. The membrane must be applied by a
licensed waterproofer, and a compliance certificate issued before tiling begins. Your plumber
coordinates this stage to ensure drainage and waste points are correctly set before the
membrane goes down.
AS 3740 waterproofing mandatory for all wet areas in NSW
Required
Compliance certificate issued by licensed waterproofer before
tiling
Required
Plumbing Code of Australia all plumbing work to AS/NZS 3500
Required
WELS-rated fixtures water-efficient taps, toilets &
showerheads
Recommended
Like-for-like fixture swap (same
positions)
$3,000–$5,000
2–3 days
Full rough-in & fit-off (new
layout)
$5,000–$8,000
3–5 days
Waterproofing (by licensed
waterproofer)
$1,000–$2,500
1–2 days
Legacy pipe replacement (if
required)
$500–$2,000+
Additional
These are plumbing costs only. Total bathroom renovation costs
(including tiling, waterproofing, electrical, fixtures, and finishes) typically run
$15,000–$35,000 in East Gosford depending on scope and finishes.
East Gosford's 1950s–70s fibro and brick homes are hitting renovation age. Bathrooms that
haven't been updated in 30–50 years often reveal hidden issues during strip-out —
corroded pipes, failed waterproofing, and asbestos-containing materials that need professional
removal.
Fibro homes (pre-1987)
May contain
asbestos sheeting behind walls
Galvanised supply pipes
Often found
corroded during strip-out
Original drainage
Clay or cast iron
— may need upgrading to PVC
Timber subfloors
May need
reinforcement for new tiling
