Subfloor Vent Installation
Additional wall and brick vents cut into the right positions to create genuine cross-flow, not just a token vent on one side of the house.
All residential services
Residential Plumbing
Subfloor Ventilation Services Throughout Sydney & The Blue Mountains
A damp subfloor rots timber, warps flooring, feeds mould and pushes moisture into your living areas. We fix the cause and get air moving again.
Licensed plumbers
Dry out the space under your house
Older Sydney and Blue Mountains homes were rarely built with enough subfloor ventilation, and later renovations, decks, garden beds and paving often block the vents that were there. The result is trapped moisture sitting against your bearers and joists all year. We assess drainage, moisture sources and airflow together, then design a solution that actually shifts the air rather than adding a vent and hoping.
- Moisture source found and repaired first
- Cross-flow designed to your floor area and layout
- Fully licensed, insured and lifetime workmanship warranty
What we do
Ventilation, drainage and damp control in one visit
Moisture & Damp Control
We find where the water is coming from — leaking pipes, poor stormwater, rising damp — and fix the source before ventilating the space.
Mould & Mildew Prevention
Drying the subfloor removes the conditions mould needs. Better air movement protects floorboards, bearers, joists and indoor air quality.
Ventilation Fans & Ducting Systems
Powered extraction fans, inlet and outlet ducting and timers or humidistats sized to your floor area for a subfloor that stays dry year round.
Warning signs
When a subfloor needs attention
Musty smell indoors
A damp odour that never quite goes away usually starts under the floor, not in the room.
Cupping or springy floors
Timber absorbing moisture from below lifts at the edges and feels soft underfoot.
Mould on skirtings or walls
Persistent mould near floor level points straight at trapped subfloor moisture.
Standing water underneath
Pooling or permanently wet soil under the house means drainage and ventilation both need attention.
Not sure if damp is coming from a leak or poor airflow? We'll tell you which.
Call 1800 172 743Our work
Recent subfloor ventilation jobs
Stop damp before it reaches your floorboards
Subfloor ventilation and damp control across Greater Sydney and the Lower Blue Mountains — call 1800 172 743.