Best Waterproofing Contractors in Australia 2026
The top waterproofing contractors across every Australian state, ranked by our composite reputation score.
Updated October 2026 · Based on 6,911 real Google reviews
Top Waterproofing Contractors Nationally
The short answer
As of October 2026, the 3 highest-ranked waterproofing contractors in Australia on the Starworks directory are Alpha Sealed WA (5.0 stars from 625 Google reviews), Professional Caulking Group (5.0 stars from 567 Google reviews) and Black Diamond Caulking | Melbourne Caulking Experts (5.0 stars from 452 Google reviews).
Starworks ranks the 475 highest-rated waterproofing contractors in Australia, holding 6,911 Google reviews between them. Across those 475 the median rating is 5.0 stars from a median of 4 reviews. Of those 475, all are rated 4.5 or better and 10 have passed 100 reviews.
Every figure here is computed from Google review data that Starworks collects for waterproofing contractors in Australia, recalculated when this page rebuilds. Placement on this list cannot be bought.
Black Diamond Caulking | Melbourne Caulking Experts
Read 452 reviews · Score: 100/100
SealTech Solutions - Leaking Shower Repairs Sydney Wide
Read 158 reviews · Score: 91/100
JUST SEAL - Silicone & Caulking Specialists
Read 103 reviews · Score: 91/100
Saba Seal - Shower Sealing Company
Read 121 reviews · Score: 85/100
GMG Waterproofing Solutions | Blue Mountains NSW
Read 85 reviews · Score: 81/100
Water Damage & Restoration Services
Read 67 reviews · Score: 81/100
Mononest Construction Group
Read 65 reviews · Score: 81/100
Omni Dry Waterproofing & Shower Repairs
Read 49 reviews · Score: 73/100
Sydney Waterproofing Services pty ltd
Read 41 reviews · Score: 73/100
Watertite Leaking Shower and Balcony Repairs
Read 35 reviews · Score: 73/100
Gen Tec Building & Waterproofing Solutions
Read 30 reviews · Score: 73/100
Bathroom Experts Tiling & Waterproofing
Read 28 reviews · Score: 73/100
Excellent roofing and home solutions
Read 28 reviews · Score: 73/100
Danrae Group
Read 27 reviews · Score: 73/100
Tank'd Waterproofing & Remedial Membranes Pty Ltd
Read 27 reviews · Score: 73/100
FixART Advanced Remedial Technology
Read 26 reviews · Score: 73/100
Showing the top 50 of the 475 highest-rated waterproofing contractors.
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Frequently Asked Questions
Who are the best waterproofing contractors in Australia?
As of October 2026, the 3 highest-ranked waterproofing contractors in Australia on the Starworks directory are Alpha Sealed WA (5.0 stars from 625 Google reviews), Professional Caulking Group (5.0 stars from 567 Google reviews) and Black Diamond Caulking | Melbourne Caulking Experts (5.0 stars from 452 Google reviews). Every figure here is computed from Google review data that Starworks collects for waterproofing contractors in Australia, recalculated when this page rebuilds. Placement on this list cannot be bought.
How many waterproofing contractors does Starworks rank in Australia?
Starworks ranks the 475 highest-rated waterproofing contractors in Australia, holding 6,911 Google reviews between them. Across those 475 the median rating is 5.0 stars from a median of 4 reviews. Of those 475, all are rated 4.5 or better and 10 have passed 100 reviews.
How does Starworks rank waterproofing contractors nationally?
To rank waterproofing contractors across Australia, Starworks combines each business's Google star rating, its review volume, and whether customers can reach it by website and phone. Volume is weighted because it shows how much evidence stands behind a rating, so a 4.9-star waterproofing contractor with 200 reviews ranks above a 5-star one with 5 reviews. Placement cannot be bought. For scale, the median rating across the 475 highest-rated waterproofing contractors in Australia is 5.0 stars from a median of 4 reviews.
Where can I find the best waterproofing contractors in my city?
Starworks publishes a separate ranking for waterproofing contractors in every Australian city and suburb it holds enough data for, each built from that place's own Google review record rather than from this national list. Browse by city below.
Why does my waterproofing contractor business not appear in these national rankings?
Starworks ranks public Google Maps data, so a business needs a Google profile in the waterproofing contractor category carrying at least one review and a rating to be eligible. This national ranking of waterproofing contractors in Australia lists the top 50 of the 475 highest-rated waterproofing contractors; a business ranked outside them appears on its own city page wherever Starworks holds enough data for that city.
Waterproofing Contractors by city
Ranked in 45 locations. The number is how many rated businesses each list is built from.