5 Best Basement Renovation Contractors in Sydney (2026)

Hunter Waterproofing Specialists, based in Auburn, is an Australian family-owned waterproofing company handling everything from bathroom and balcony waterproofing to full sub-floor excavation for basement conversions. Reviewers describe multi-week projects involving jackhammering out old concrete, installing drainage systems and sump pumps, and pouring reinforced concrete floors for finished spaces like home bars and man caves.

Sydney Waterproofing Experts covers balcony, bathroom and structural waterproofing across Sydney, with technicians Mike and Brad named repeatedly by reviewers for detailed, multi-stage jobs. One reviewer describes a 47-square-metre balcony leak fix involving tile removal, damaged cement board replacement and structural support repair, done in full view of the homeowner over multiple stages.

Rising Damp Sydney specializes in rising damp treatment, damp plastering, mould remediation and subfloor ventilation, alongside general waterproofing, and covers most of the Sydney metro area. Reviewers specifically describe basements that had been worsening for years finally staying dry through multiple winters, and the company is noted for careful handling of heritage federation-era homes with original brickwork.

Mister Membrane Waterproofing Sydney, based in Banksmeadow, has over 40 combined years of experience serving builders, strata, developers and homeowners. Reviewers include a builder describing waterproofing membrane work for a new class 2 build in Fairlight that passed a secondary third-party inspection, alongside residential leak-fix jobs.

Sydney Waterproofing Services, based in Seven Hills and operating since 2016, covers remedial waterproofing, balconies, bathrooms, pools and planter boxes. Reviewers repeatedly name technician Aaron for using diagnostic camera equipment to pinpoint leak sources before quoting, including footage shown directly to customers to explain the problem.