Below-Ground & Tanking
Substructure and below-ground tanking designed with the hydraulic engineer to handle the water table and hydrostatic pressure, protecting basements and foundations from day one.
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Waterproofing faults are one of the leading causes of building defects, and the cheapest time to get them right is during the build. Sydney One Waterproofing delivers licensed, compliant new construction waterproofing for builders and developers across Sydney, from below-ground tanking to podium decks and wet areas, integrated with your program and certified to Australian Standards, backed by a 10-year workmanship warranty.
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On a new build, waterproofing is a small part of the budget but a leading cause of defects when it is rushed or value-engineered out. A membrane installed incorrectly, a below-ground system that ignores the water table, or detailing missed around penetrations all surface as leaks, rectification works and disputes after handover, exactly when they are most expensive to fix.
We integrate waterproofing into the build from the planning stage, coordinating with builders, hydraulic engineers and certifiers so the right systems, drainage and detailing are designed in rather than retrofitted. Every system complies with the NCC, AS 3740 and AS 4654, and we provide membrane specifications, inspection records and certification to support occupation certificate and DBPA requirements.
Integrating professional waterproofing during construction is one of the highest-return decisions on any project. Here is what it delivers for builders and developers.
Waterproofing faults are a leading cause of building defects. Getting the membranes, tanking and detailing right during the build stops water ingress before it ever reaches the structure or finishes.
Fixing waterproofing after handover means opening up finished work. Building it in correctly the first time avoids rework, callbacks and disputes that erode project margins.
Properly tanked substructures and sealed slabs prevent the water ingress that corrodes reinforcement and degrades concrete, protecting the structural integrity of the finished building for the long term.
Dry, sealed wet areas, balconies and basements mean fewer defects at inspection and a cleaner handover, protecting your reputation with owners, purchasers and certifiers.
Every system complies with the NCC, AS 3740 and AS 4654, with membrane specifications, inspection records and certification that support occupation certificate, DBPA and Declared Design requirements.
We coordinate with your site team and stage works to fit the build sequence, so waterproofing is installed at the right point without holding up the construction program.
From below-ground tanking to podium decks and wet areas, we install integrated waterproofing systems across every stage of your Sydney construction project.
Substructure and below-ground tanking designed with the hydraulic engineer to handle the water table and hydrostatic pressure, protecting basements and foundations from day one.
Get a quote →Podium and roof deck waterproofing to AS 4654, with the right membrane, falls and detailing to protect the occupied spaces below from water ingress over the building's life.
Get a quote →Negative and positive-side membrane systems for new basements and car parks, integrated with drainage and waterstops to keep below-grade levels dry and usable.
Get a quote →External balcony and terrace membranes installed to AS 4654 with correct falls and termination detailing, engineered for Sydney's weather and UV exposure.
Get a quote →Bathroom, laundry and internal wet area membranes installed to AS 3740 with continuous coverage and correct falls, the most inspected waterproofing in any new build.
Get a quote →Concrete tanking for water tanks, retaining walls and structural elements, creating a durable, watertight barrier built into the structure of your project.
Get a quote →Specialised waterproofing for new lift pits, plant rooms and service areas, creating a robust barrier that protects building services and equipment from water damage.
Get a quote →We work to the NCC, AS 3740 and AS 4654, coordinate with certifiers, and provide specifications, inspection records and certification for occupation certificate and DBPA requirements.
Get a quote →On a build, the cost of getting waterproofing wrong is measured in rectification, callbacks and reputation. Here is how integrating it from the start compares to fixing it after handover.
A clear, four-step process that takes the guesswork out of protecting your property.
We review the plans and specification with the builder and hydraulic engineer, and advise on the right systems, falls, drainage and detailing before work starts.
You receive a documented scope with membrane specifications, staging that fits the construction program, and a clear, no-obligation quote priced into the build.
Our team prepares each substrate and installs the membrane and tanking systems to Australian Standards at the right point in the sequence, integrated with concrete and drainage works.
We complete inspections, provide compliance documentation and certification for occupation and DBPA requirements, and hand over your written 10-year workmanship warranty.
Real feedback from Sydney builders, developers and project managers we have partnered with on new construction projects.
"Brought them in at the design stage for the below-ground tanking on our development. Worked seamlessly with our hydraulic engineer and hit every program milestone. Certification was spot on at handover."
"We use them across all our new builds now. Podium decks, wet areas and basements all done to spec, staged around our trades, and never a defect flagged at certification. Reliable every time."
"Handled the full waterproofing package on our multi-storey project, from substructure tanking to balconies. On budget, on program, and the documentation made certification painless. Highly recommend."
New construction is a specialty of ours, but our licensed crews also deliver tested systems for residential, commercial and strata projects across Sydney.
Discuss Your ProjectHomes, townhouses and renovations. Compliant waterproofing for bathrooms, balconies, kitchens and laundries.
Offices, retail, warehouses and high-rise. Scalable crews and minimal disruption with after-hours options across Sydney.
Apartment complexes, common property and remedial works. We coordinate with strata managers and committees from inspection to certification.
Builders and developers trust us to integrate code-compliant waterproofing from the build stage across new builds and large-scale developments.
One of our licensed waterproofers will review your plans, identify the right systems for the build, and provide a documented scope and quote priced into your project with no obligation.
We respond within 24 hours, Monday to Saturday.
Common questions about waterproofing your Sydney construction project. Still curious? Our team is one call away.
Talk to a SpecialistYour trusted partner for expert waterproofing solutions, ensuring long-lasting protection for your home and business from water damage.
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