Buying or renovating in the Hills is exciting – until a slow gurgle, a stubborn hot tap, or a surprise wet patch turns up after settlement. Before you commit, a local Plumber Cherrybrook inspection helps uncover pressure issues, root-prone drains, and stormwater bottlenecks that can snowball later. Use this guide to audit a home so you know what you’re getting, and what it will cost to put right.
Start with the three pressure questions
What’s the incoming pressure at the boundary?
Clip a gauge to an external tap. Healthy domestic pressure sits around 350–550 kPa. If you’re seeing 700 kPa or more, budget for a pressure-reducing valve (PRV) at the meter. High pressure shortens the life of mixer cartridges, flexi hoses and appliances, and it amplifies water hammer.
Do taps “thud” or rattle when shut?
That’s hammer, a pressure wave from fast-closing valves (dishwashers, washing machines) bouncing through poorly supported or high-pressure pipework. Plan to fit AA-rated arrestors near culprits and secure long runs. If you’re renovating, have your plumber set the PRV first; it’s the master control.
Is pressure even across the house?
Compare kitchen, laundry and the furthest bathroom on both hot and cold. If upstairs is weak while ground-floor taps roar, you may have partial blockages, undersized branch lines, or balance issues on any hot-water recirculation.
Sewer and stormwater: CCTV before you commit
Why camera work matters here
Leafy verges and older clay lines mean root intrusion and hairline cracks are common at joints and changes of direction. A quick plunge clears today’s symptom; a home drain camera survey shows tomorrow’s failure.
What to ask for in a survey
- A full run from the overflow relief gully (ORG) to the boundary (and to each branch that feeds problem fixtures).
- A condition code and a link to the footage, so you can compare quotes for relining vs replacement on the same facts.
- Pin-pointing of any sags (ponding) or misaligned joints: these collect grease and tissue and are the usual cause of slow, smelly drains.
Red flags that add cost later
- ORG too high (or concreted over): any sewer backup will seek the lowest point; if that’s a shower, you’ll learn the hard way.
- Repeated gurgling during rain: stormwater is overwhelming sewer vents, or the sewer is partially obstructed. Either way, plan a jet clean and vent check before settlement.
Hot water: size, safety and stability
Storage tanks
Look for constant discharge from the temperature/pressure relief (TPR) line. Occasional drips during a heat cycle are normal; steady flow means overheating, expansion issues, or a tired valve. Check anodes and thermostat settings during the service.
Continuous-flow units
Short cycling (burner on/off rapidly) = scale or incorrect gas pressure. If a bathroom was added since the unit went in, you may simply be under-sized. It’s cheaper to upsize than to live with lukewarm showers.
Tempering valves
These mix to safe outlet temps and drift over time. If showers pulse or arrive lukewarm then spike, have the tempering valve serviced or replaced and strainers cleaned on both inlets.
Roof, gutters and downpipes: capacity beats gadgets
First bends tell the truth
The first elbow under each downpipe is where leaves settle. If these are choked during an inspection, expect the underground stormwater to be worse. Clear bends and re-test flow with a hose.
Can the roof actually drain heavy bursts?
Wide, steep roof planes overwhelm single downpipes. If you see sheet-over at a corner, the fix is capacity (a larger outlet or an extra downpipe), not just “gutter guard”. Budget to add a dropper and tie into stormwater with proper fall.
Balcony and courtyard drains
Townhouses often run long, low-fall channels to a single outlet. Lift the grate: if there’s no debris basket, fit one. If water sits in the pit after flow stops, the outlet is flat or silted; jet and camera now, not after your first summer storm.
Mixers, flexi hoses and isolation: cheap wins that prevent floods
Mixers
If a “new” mixer still drips after a cartridge swap, the brass seat in the body is likely scratched from grit. Flush the body, dress the seat if needed, and add mini-filters on flexis, especially post-reno when debris is common.
Flexi hoses
Replace anything older than five to seven years with WaterMark-approved braided stainless from a known brand. Fit mini-stops (isolation valves) under basins, sinks and at the cistern; they allow quick shutdowns and extend fixture life.
Laundry and kitchen: hammer zone and high flow
Washing machines and dishwashers
Fit arrestors within a metre of each solenoid appliance. Secure exposed pipework to maker-specified spacings. In nib walls and behind fridges, check that copper/PEX has room to expand without rubbing.
Sinks that “breathe”
If a kitchen sink glugs or smells after draining, the trap or venting is wrong, or the line is partially obstructed. In older homes, underslung traps with long flat runs are common. Budget to correct fall and add an accessible clean-out during the kitchen renovation.
Bathrooms: slow wastes, smells and tile-friendly fixes
Floor wastes that smell
Rarely used wastes dry out and let sewer odour through. Keep traps wet (a jug of water monthly) and add a teaspoon of mineral oil to slow evaporation. If odour persists, the issue is upstream; camera the branch.
Shower that drains slowly
Hair and soap are symptoms, not causes. The usual culprit is a flat section just before the stack. Jet, camera, and if there’s ponding or a cracked junction, reline that short section to restore flow without ripping up tiles.
Irrigation, rain-to-mains and backflow
Irrigation leaks even when “off”
Controllers don’t shut water; valves do. A stuck master or grit in a zone solenoid can pass water 24/7. Isolate the manifold (not just the controller) during the night-test; if the meter stops, service the valves and check laterals for splits.
Rain tanks feeding toilets/laundry
Ensure a compliant rain-to-mains switch with tested backflow protection. Cloudy toilet water = immediate switch to mains and a tank line check. Backflow failures are rare and easy to prevent with scheduled testing.
Planning a renovation? Stage the plumbing work
Stage 1: pressure and protection
Install the PRV, add arrestors, replace tired flexis, and set isolation points while walls are open. These are low-cost, high-impact upgrades.
Stage 2: drains and compliance
Jet and camera all critical runs, reline short failing sections, correct ORG level, add clean-outs, and right-size balcony/strip drain outlets before waterproofing.
Stage 3: fixtures and fine-tuning
Fit mixers with accessible isolation, set tempering valves, balance any hot-water recirculation, and test every run at real-world flow—not just trickle tests.
What to ask your plumber for (in writing)
- A one-page pressure report (static/dynamic) and PRV setting
- CCTV links with a condition code and exact locations of defects
- A drain plan showing clean-outs and ORG position/level
- A punch-list that separates urgent (safety/compliance) from soon (performance/longevity) items, with ballpark costs
When to bring in a local pro
If your night-test shows movement with everything “off”, if a balcony line holds water after five minutes, if the ORG sits high or hidden, or if pressure readings are wild from tap to tap, it’s time for a licensed team that knows the local housing stock. A local crew can gauge pressure at the boundary, set a sensible PRV, jet and camera the right lines, reline where it saves your tiles, and leave you with documentation that makes budgeting – and future maintenance – simple.
Final Thoughts
Measure pressure first, see drains with a camera (not guesses), fix ORG levels, add capacity where roofs and balconies overwhelm outlets, and tackle small flexi, mixer and isolation upgrades while you’re already doing work. Do that, and the plumbing fades into the background – quiet, compliant, and ready for the next summer storm.
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