Kanwal's dominant 1970s–80s housing stock was plumbed with galvanised steel supply lines.
After 40–50 years, these pipes corrode internally — reducing pressure,
discolouring water, and eventually failing.
Galvanised to copper repipe full house
$3,500–$8,000
Section replacement kitchen or bathroom run
$800–$2,000
Water pressure test diagnose restriction
$150–$250
Original terracotta sewer laterals in 1970s homes are highly vulnerable to root intrusion. Garden
trees planted at the same time are now large and mature — their roots seek moisture
through every crack and joint.
Jet blasting
$200–$500
CCTV drain inspection
$250–$450
Pipe relining (per metre)
$400–$800
Properties on Kanwal's eastern edge near Craigie Park and Tuggerah Lake sit on low-lying land
with a naturally high water table. Seasonal lake-level fluctuations can impact subfloor
drainage and stormwater.
Stormwater pump-out
After heavy
rain
Subfloor drainage
Lake-edge homes
affected
Backflow prevention valve
$300–$600
Kanwal is entering a densification phase — dual occupancy approvals and
knockdown-rebuilds are increasing. New builds require full hydraulic compliance and
represent a growing category of plumbing work.
Sewer connection (new build)
$2,000–$5,000
Bathroom rough-in
$3,000–$6,000
Compliance certificate
$200–$400
