Balcony & Structural | The Remedial Builders

Balcony & Structural Forensic Tool

0Client Details

1Project Scope & Size

Full RenovationStrip to Slab + New Tiling

Targeted RepairInjection & Perimeter Seal

m²

2Condition Assessment

Water staining on ceiling below Efflorescence (Salt / White Powder) Structural Render / Column Repair ⚠️ Sliding Door Sill Failure (Get consult) ⚠️ Concrete Cancer = Exposed Rebar (Get consult when site inspection)

3Logistics

Ground Floor Access (-5% Discount) Heavy Scaffold Required

Our Core Principle

Structure First, Waterproofing Second

Approximate Balcony Waterproofing Cost Guide (Sydney 2026)
(Final cost always depends on size, access, condition & structure)

Case - study

Balcony Leak Repair (Sydney)

The owner contacted us after water leaked into the living room below their balcony during heavy rain. Previous repairs had failed twice. Our inspection found the balcony was built on yellow-tongue flooring with incorrect waterproofing.

Cost $14,325

Area 7m2 / Level 2
Full construction cost, included mobile scaffold

6years

Warrantly

Concrete sheet / 20mm cement board systems

We removed the failed system, rebuilt the surface with correct falls, installed a certified two-layer membrane, carried out a 24-hour flood test, and retiled the area.

Requires full flexible membrane system
Extra joint treatment required

Work Done:

20mm Concrete board / Joint work
Flexible membrane / waterproofing system
UV-stable top coat

Testing: We ran a water test to make sure the membrane had no leaks.
‍Report: Owners received photos of each layer + test results.

We installed new outdoor tiles with R12 slip resistance for safety.Flexible joints were added to stop cracking and movement issues.

Report: Final photos and a completion update sent to the owners.

Stage-by-stage progress
Critical inspection points
Easy-to-read notes for strata records
Warranty Cetificate: aterproof membrane^6-years / New Under Structural^10years

Balcony Waterproofing 2026 | The Remedial Builders

THE REMEDIAL

BUILDERS

BY YOUR TRUST

LIC. 283896C

WATERPROOFING DEPT.

Leak Prevention

Balcony Seal.

Certified Class III membrane installations and remedial balcony repairs to stop structural water ingress.

$145.00 Remedial / m²

2026 AS4654.2 Cert

01 PREPARATION

Tile Stripping & Screeding

$95.00/m²

02 BARRIER

Multi-Stage Membrane

$50.00/m²

Balcony Leaking? Help

Beyond the Surface: The Hidden Risks of Balcony Membrane Failure.

90%

$2k