Sunbury Building
Inspections

Subfloors in older Sunbury homes

Ventilation, stored timber and damp under raised floors.

Sunbury 3429 · 18 June 2026

In short: Older homes with timber floors have a subfloor that tells you a lot about pest and damp risk.

Ventilation

Poor airflow keeps the subfloor damp, which raises the risk of termites, borers and decay.

Stored timber

Offcuts and old timber stored underneath attract termites.

Signs of leaks

Staining and damp soil under bathrooms point to past or present leaks.

Access

We enter where it is safe, and list areas we cannot reach.

Written by our local inspection team from work carried out in Sunbury. Licensed building practitioners, Building & Plumbing Commission registration CDB-U 53425.

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FAQ

Questions Sunbury owners ask about this

Do newer homes have subfloors?

Most new Sunbury homes are on slabs, so this applies mainly to older houses.

Can ventilation be improved?

Often, by clearing vents and adding more. A builder can advise.

Is a damp subfloor serious?

It raises the timber pest and decay risk, so it should be addressed.

What if there is no access?

The report says so, as a limitation.

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