● Licensed waterproofing contractor · Report only, no repair upsell
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Inspecting a wet area in a Sydney property

Waterproofing & leak investigation · Sydney

Find the source. Understand the problem. Know what to do next.

Where water appears can be very different from where it's actually entering. Independent water ingress investigations, inspections and diagnostic reports for homeowners, strata and building professionals.

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30+
years in waterproofing
0
repair upsell
100%
independent reports

Why guessing fails

Live trace
Balcony — tiles & membraneApartment below — ceilingconcrete slabEnters here38%27%19%…stain shows up 2.3 m away
Where water appears is rarely where it enters. Repairing the stain fixes nothing — moisture mapping finds the actual path.

60-second check

Is your leak worth investigating?

Tick anything you've noticed in or around the property.

Our take

Tick a box to get a read

Every symptom tells us something about where the water is travelling. Select the ones you've noticed and we'll point you at the right level of investigation.

Fixed-scope services

Four defined services. Published prices.

Licensed waterproofing contractor. Clear scope and pricing — you approve the scope before we book. No surprise invoices.

Fast & affordable

On-Site Assessment

"Quick, honest answers on site."

$395 + GST

A professional on-site assessment of waterproofing and wet-area conditions — quick answers without the cost of a full diagnostic report.

You receive: Verbal findings on site plus summary condition notes. No written diagnostic report.

Suitable for

  • ✓Waterproofing workmanship concerns
  • ✓Wet-area condition checks
  • ✓Tiling & waterproofing defects
  • ✓Second opinions before committing to repairs
  • ✓General waterproofing advice

Ideal for: Owners who want a quick, honest read on the problem before deciding next steps.

Book this service
For builders & renovators

Pre-Tile / Pre-Cover Inspection

"Catch it before the tiles hide it."

$350–$550 + GST per visit

Inspection at a defined hold point before waterproofing work is concealed — so defects are caught while they can still be fixed cheaply.

You receive: Written hold-point observations with photos, ready to hand to your waterproofer or builder.

What's checked

  • ✓Visible surface preparation
  • ✓Junctions & penetrations
  • ✓Upturns & terminations
  • ✓Drainage & falls
  • ✓Available product records

Ideal for: Builders, renovators and owners who want an independent check before tiling or covering.

Book this service
Most requested

Leak Investigation & Defect Report

"Find the source before you pay for the fix."

$450–$850 + GST

A comprehensive, evidence-based investigation into the likely source and cause of water ingress — documented, photographed and ready to act on.

You receive: Full written report: site inspection of accessible areas, job history, photos, moisture checks, evidence-based assessment, limitations and next steps.

What's included

  • ✓Site inspection of accessible areas
  • ✓Moisture testing & mapping
  • ✓Photographic evidence
  • ✓Evidence-based assessment
  • ✓Clear limitations — what the evidence does and doesn't prove
  • ✓Recommended next steps

Ideal for: Leaking showers, bathrooms, laundries, balconies and unexplained moisture.

Book this service
For managers & committees

Strata / Common-Property Assessment

"One report the whole committee can act on."

$850–$1,800+ + GST

Multi-area or higher-complexity water ingress assessment, structured for owners corporations and property managers.

You receive: Strata-ready report with prioritised findings, investigation gaps and practical remediation options — for committee meetings, contractor quotes and insurance claims.

What's included

  • ✓Multi-area or complex ingress
  • ✓Water ingress between apartments
  • ✓Recurring or disputed leaks
  • ✓Prioritised findings
  • ✓Practical remediation options
  • ✓Common property concerns

Ideal for: Owners corporations, strata managers and disputed or multi-lot leaks.

Book this service
Add-on

Flood testing — trust the data, not the promise

A controlled water test of a shower, balcony or new membrane over a set period, with before-and-after moisture readings. Add it to any investigation or pre-tile inspection when you need proof the area holds water — before tiles go down or before you sign off a repair.

Ask about flood testing

Who we help

Built for the people stuck with the leak

Homeowners

Know what you're actually paying to fix.

Before you rip out a bathroom on a guess, get evidence of where the water is really coming from — and a report you can hand to any repairer for comparable quotes.

Usually books: Leak Investigation & Defect Report

Strata & owners corporations

Evidence your committee can act on.

Leaks between lots turn into disputes fast. You get a structured, photographed report that shows the likely source, who it affects and the practical options.

Usually books: Strata / Common-Property Assessment

Builders, renovators & tilers

Independent sign-off before you tile over it.

Catch membrane defects at the hold point while they cost minutes, not a rebuild — with written observations and optional flood testing.

Usually books: Pre-Tile / Pre-Cover Inspection

What we investigate

Every wet area has its own failure pattern

The room that hides the most

Leaks, failed waterproofing, grout and sealant issues, drainage and moisture migration. Showers are where most 'mystery leaks' start — and where the wrong repair gets repeated.

  • ●Failed or breached membrane
  • ●Grout & silicone joint failure
  • ●Drainage and waste issues
  • ●Moisture tracking into adjoining walls

How it works

Three steps from stain to answer

  1. 01

    Investigate

    We inspect the affected areas and use appropriate diagnostic methods to investigate potential sources of water ingress.

  2. 02

    Diagnose

    We assess the evidence, moisture patterns, waterproofing details, tiling, drainage and other contributing factors.

  3. 03

    Report

    You receive clear findings, photographic evidence and recommendations outlining the appropriate next steps.

Why us

Investigated by the trades, not a salesman

Specialist trade knowledge

Investigations led by a licensed waterproofing contractor, backed by a senior trade team 30+ years deep — we know how wet areas are built, and how they fail.

Evidence-based investigation

We don't simply assume the membrane has failed. We investigate the evidence to identify the likely source and contributing factors.

Clear, practical reports

No unnecessary jargon. What we found, what's likely causing it, and what should happen next — in plain language.

Photographic proof

Every finding is photographed and mapped, so your insurer, strata committee or builder can see exactly what we saw.

Reports referenced against

AS 3740 — Wet areasAS 4654 — External membranesNational Construction CodeNSW Design & Building Practitioners Act

Fully licensed waterproofing contractor — licence details provided on request.

Photo of Adrian on site
(send me one)

Who you're dealing with

30+ years of waterproofing behind every report.

Waterproofing Assessment Group is led by Adrian, a licensed waterproofing contractor, with over 30 years in the trade between our team. We've installed membranes, tiled over them, pulled them up and fixed them, so we know exactly where wet areas fail and what the evidence looks like when they do.

We're a new business, and that works in your favour. You deal with us directly from the first call to the final report, and every report we write is our reputation. Our licence is behind every finding we put in writing.

30+ years
waterproofing experience
Trade
background, not sales
0
repair upsell

Why owners choose us over the big firms

Who turns up
✓ The people who write your report
A junior, report written by someone else
Built for
✓ Homeowners, strata & small jobs
Large developers & builders
Pricing
✓ Fixed, published prices
Quote on request
Explained in
✓ Plain English + photos
Technical jargon
Repair upsell
✓ Never — report only
Often sell remediation

Report-only option

Need the truth without the sales pitch?

We provide an investigation and report only — we don't do the repair. Use the findings when getting quotes, briefing your strata committee, or deciding what to do next.

  • ✓Comparing quotes from multiple repairers
  • ✓Evidence for strata meetings & committee approvals
  • ✓Supporting insurance claims and disputes
  • ✓Independent second opinion on a proposed repair

Straight answers

Questions owners ask before booking

Do you also do the repair?+

No — and that's the point. We investigate and report only, so there's no incentive to find a bigger problem than you have. Use the report to get quotes from any repairer.

How much does a leak investigation cost?+

Our prices are published: On-Site Assessment from $395, Leak Investigation & Defect Report $450–$850, Strata / Common-Property Assessment $850–$1,800+, and Pre-Tile Inspections $350–$550 per visit (all + GST). We confirm the scope and price before we book.

Is it the shower, the balcony or the plumbing?+

That's exactly what an investigation answers. Water often appears metres from where it enters, so we test and map moisture rather than assume the membrane has failed.

Can I use the report for strata or insurance?+

Yes. Reports include photos, moisture readings, an evidence-based assessment and clear limitations — the format committees, managers and insurers need to make a decision.

Will you damage my tiles?+

Investigations are non-destructive and focus on accessible areas. If the evidence suggests invasive testing is needed, we'll explain why and get your approval first.

Who actually does the inspection?+

Adrian personally leads every investigation, backed by a senior trade team with over 30 years in waterproofing between us. The people who inspect your property are the people who write your report.

Book an investigation

Know what's causing the leak before you repair it

Avoid unnecessary repairs and guesswork. You'll speak directly with the people doing the work.

  • On-Site Assessment — from $395 (verbal findings, no report)
  • Leak Investigation & Defect Report — $450–$850
  • Strata / Common-Property Assessment — $850–$1,800+
  • Pre-Tile / Pre-Cover Inspection — $350–$550 per visit

0457 957 521

hello@waterproofingassessment.com.au

8am – 5pm, Monday to Saturday · Servicing all of Sydney

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