Certified membranes, honest advice and a written 7-year warranty. We waterproof basements, bathrooms and pools across Prestons and nearby suburbs.
Prestons NSW 2170
Need dependable waterproofing in Prestons? Our licensed team provides expert Prestons waterproofing for houses, apartments, townhouses and commercial buildings. We repair leaking basements, bathrooms, pools and more using proven membrane systems, with every job backed by a written 7-year warranty.
From family homes and newer housing estates, the properties we waterproof in Prestons and across the south-west Sydney vary a lot. What doesn’t change is our approach: inspect carefully, find the cause, and use a membrane system that suits the surface, the exposure and how the space is used.
Our process is simple: a free inspection, a clear written quote, proper surface preparation, the right membrane applied at full thickness, and testing and certification at the end. No shortcuts, and no paying twice for the same leak.
Every waterproofing service is available in Prestons. Basement, Bathroom, Pool and Balcony waterproofing get our closest attention, because they’re the jobs Prestons property owners call us for most.
Below ground
Damp patches, salt and moss on a retaining wall, or water across a garage floor after rain, mean water is getting through instead of draining away. We find the entry points and seal walls, slabs, joints and lift pits properly.
Showers & en-suites
Whether you’re renovating or chasing a leak, the membrane under the tiles is what keeps water where it belongs. We install certified wet-area membranes with bond-breakers, reinforced corners and properly sealed penetrations, then issue a compliance certificate for your records.
Pools
Pools lose water through cracked shells, failed construction joints and leaking fittings. We find which one it is, repair it properly and apply a pool-grade membrane suited to constant immersion and chlorinated water.
Balconies
Balconies fail at the door sill, the drain and the balustrade fixings. Once water gets past the membrane it stains the ceiling below, lifts tiles and leaves white efflorescence on the soffit. We strip and re-waterproof balconies in Prestons with UV-stable external membranes to AS 4654.
Flat concrete roofs and roof decks re-membraned so they shed water instead of ponding and leaking into the floor below.
Box and eaves gutters re-membraned so storm water runs off the roof instead of spilling into walls and ceilings.
Lift pits and shafts sealed against groundwater to protect lift equipment and stop corrosion in apartment and commercial buildings.
A properly sealed laundry floor and upturn protects floors, walls and neighbouring rooms from washing machine and tub leaks.
Floor waterproofing for homes, units and businesses, applied with the right primer and system for concrete, screed or timber subfloors.
Epoxy resin injected under existing tiles seals a leaking shower without demolition – a faster, lower-cost fix when the tiles are still sound.
Garden beds built against walls and over slabs are a common hidden leak. We waterproof and drain them properly.
Damp brickwork lets water track inside. We treat and seal masonry walls to keep moisture out for good.
Our inspection finds the real source of a leak first, so you only pay to fix what's actually failing.
All work is carried out under Waterproofing Licence 36763C. Ask to see it on site – a licensed contractor protects you, your insurer and your strata.
Internal wet areas to AS 3740 and external membranes to AS 4654, with a compliance certificate for your records, sale or strata.
One leaking shower or a whole building – we scale the team and schedule to suit, with minimal disruption.
You’ll know the scope and price in writing before we start. The price we quote is the price you pay for that scope.
You get a written 7-year warranty on our workmanship, so you can renovate, rent or sell with confidence.
Stains and damp patches can be metres from the real leak. We track the water back to where it enters before recommending a fix.
Spotted any of these at your Prestons home, unit or business? Call us before a small leak becomes a big repair.
Groundwater is getting past below-ground walls or joints.
Water is passing through the wall instead of draining behind it.
The bond has failed because the bed underneath is wet.
Water is sitting behind tiles or inside the wall cavity.
More loss than evaporation usually means a failed membrane or joint.
A bathroom, balcony or roof above is leaking through the slab.
Clear, careful and fully certified – our process for every Prestons property.
We visit your Prestons property and trace the leak to its source.
You get the findings, the fix and the cost in writing.
We clean, repair and prime the substrate, then build up the membrane to the specified thickness.
Wet areas are flood tested where suitable, then certified and covered by our warranty.
From homes and units to commercial buildings, we cover every part of Prestons NSW 2170 and the surrounding south-west Sydney. Call to book a free inspection at a time that suits you.
AB Sydney Waterproofing 24 Copeland St, Liverpool NSW 2170 0449 725 455 avo.bghdoean@gmail.com
Yes – we work across Prestons and nearby suburbs every week, for homeowners, landlords, builders and strata managers. Call 0449 725 455 to arrange a free inspection.
Yes. Where excavating outside isn’t practical, we use negative-side systems applied from inside the basement to resist water pressure through the wall.
Yes. We apply a certified membrane to AS 3740 before tiling and provide a compliance certificate for your records, your builder and any future sale.
Yes – we hold Waterproofing Licence 36763C. Using a licensed contractor protects you if you need to make an insurance claim, get strata approval or sell the property.
Most shower and balcony repairs take a few days including curing time; tile injection is usually done in a day. Larger roofs, basements and strata jobs are scheduled in stages – we’ll give you a timeframe with your quote.
What happens when waterproofing fails – and how to avoid the cost.
Read MoreHow a bathroom should be waterproofed, step by step, so it stays leak-free for years.
Read MoreFalling water levels, cracks and damp paving – the signs your pool is leaking.
Read MoreTalk to a licensed waterproofer today – free inspection and written quote.
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