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Roof Leak Mould in a Croydon Master Bedroom: Strip-Out, Clearance Test and Full Rebuild
By Michael Nguyen | Indoor Environmental Professional (IEP) | IICRC WRT, AMRT, ASD (69486970) | Mould Testing Technician (NAT10913005) | Licensed Builder NSW 392154C (Supervisor, KBL+RENO)
In August 2026 we remediated and rebuilt a master bedroom in Croydon, in Sydney's Inner West, after a roof leak caused mould inside the walls. We stripped out the mouldy plasterboard, replaced water-damaged timber bottom plates, and rebuilt the room only after an independent hygienist carried out post-remediation verification.
The job took 8 days from strip-out to a painted room with the wardrobe back in, and cost $6,000 including GST. This post covers what we removed, why we waited for the clearance test, and how we rebuilt.
The Job
Water from a roof leak had run down inside the master bedroom walls. The plasterboard was mould-affected, and the timber bottom plates of the wall frame, which sit on the concrete slab, were water damaged. The roof itself was repaired by the insurer's builder, and our job was the mould remediation and the rebuild inside.
Because we are both mould remediators and licensed builders, one team handled the whole job:
Strip out all mould-affected plasterboard
Remove and replace the damaged timber bottom plates
Remediate the exposed frame to the IICRC S520 standard
Independent post-remediation verification by a hygienist
Re-sheet, set and paint the walls
Reinstall the wardrobe shelving and hanging rails
Why We Waited for the Clearance Test
Rebuilding too early can seal mould inside the wall. So the new plasterboard only went up after an independent hygienist had tested the room. Using a hygienist who is not part of our company keeps the result impartial for the owner, their insurer and any future buyer.
The Rebuild
Bottom plates take the first hit when water reaches a slab floor, so we cut out the damaged lengths and fixed in new timber. We then re-sheeted the walls with new plasterboard, set the joints, and painted.
Inside the walk-in robe, the new sheets were set around the shelving line before the wardrobe was reinstalled.
All building work was carried out under NSW builder's licence 392154C.
Outcome
Mouldy plasterboard and water-damaged bottom plates removed and replaced
Independent post-remediation verification carried out before any rebuilding
Room painted and wardrobe reinstated
8 days from strip-out to handover
What It Costs
This job cost $6,000 including GST, covering the strip-out, remediation, new bottom plates, plasterboard, painting and wardrobe reinstatement. Every job is different, so we quote after seeing it. Our mould inspection and quote are free, and professional moisture and mould reports start from $500 + GST. See our mould removal and remediation service or call 1300 739 783.
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About the Author
Michael Nguyen is the director of AAA Mould Removal and leads our water damage and mould remediation work across Sydney. His qualifications include:
Indoor Environmental Professional (IEP) – Testing Water-Damaged Buildings, Australian College of Environmental Studies (RTO 21740), 2026. Includes nationally recognised units NAT11429003 Conduct a comprehensive mould and moisture assessment and NAT11429007 Conduct post remediation verification mould testing (11429NAT Advanced Diploma of Building Biology)
IICRC Water Damage Restoration Technician (WRT)
IICRC Applied Microbial Remediation Technician (AMRT)
IICRC Applied Structural Drying (ASD), IICRC no. 69486970
Mould Testing Technician (NAT10913005)
Licensed Builder NSW 392154C (Supervisor, Kitchen, Bathroom & Laundry and Renovation)
Carpentry Licence
Worried About Mould or Water Damage?
Call AAA Mould Removal on 1300 739 783 or contact us online. We will find the moisture, remove the mould properly and dry your home to IICRC standards.
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