Inadequate ground clearance / ventilation
MajorWhat you may see: Low clearance, blocked or missing vents, stale damp air under the house.
Risk: Promotes fungal decay and conditions conducive to timber pests.
Building guide
Subfloor inspection guide
The space under a suspended timber floor often hides moisture, decay, poor support, and timber pest conditions buyers never see on a short walkthrough.
Why it matters
Subfloor problems can mean expensive structural repairs after settlement. Restricted access, blocked vents, damp ground, and timber close to soil are classic risk factors — and they are easy to miss without a thorough inspection.
Common defects
Rated the way we discuss findings in reports — Major, Minor, Safety, or Further investigation.
Damp soil, ponding, or poor drainage under the building
MajorWhat you may see: Wet ground, musty odour, staining on piers or timber.
Risk: Ongoing moisture attack on footings, piers, and framing.
Decayed, fretting, or poorly supported bearers and joists
MajorWhat you may see: Soft timber, crushed packing, leaning or undersized supports.
Risk: Floor bounce, settlement, and costly structural remediation.
Debris, formwork, or timber stored against the structure
MinorWhat you may see: Old timber, cardboard, or rubbish under the house.
Risk: Harbour for pests and retained moisture against framing.
Missing or bridged ant caps / timber-soil contact
Further investigationWhat you may see: Timber touching soil, garden beds built up against piers.
Risk: Creates pathways and conducive conditions for termites.
Unsafe access or electrical hazards visible in the subfloor
SafetyWhat you may see: Exposed wiring, unprotected openings, collapse risk at access.
Risk: Injury risk during occupation or future works.
Quality checklist
What “good” tends to look like for this area.
- Dry, ventilated subfloor with working wall vents
- Reasonable clearance for inspection where design allows
- Sound bearers, joists, and pier supports
- No timber-soil contact or bridging of termite management details
- Site drainage directing water away from under the building
How Sitescop inspects
- Locate and enter accessible subfloor hatches or openings where safe
- Inspect piers, bearers, joists, ant caps, and ground conditions systematically
- Note moisture clues, decay, movement, and pest-conducive conditions
- Photograph representative defects and overall condition for your report
- Flag areas that were inaccessible so you know what was not seen
Technology & knowledge
- High-output lighting for dark voids
- Moisture assessment where readings assist diagnosis
- Photo documentation of each significant finding
- Cross-check with pest inspection findings on combined jobs
Photo examples
Open educational imagery matching this area of the building. We will swap these for anonymised on-site defect photos as you supply them — never publishing client-identifying details.
Subfloor with brick piers, plumbing, and loose cabling on the ground
Debris and rubble on the dirt ground under the floor — harbour and moisture risk
Timber joists on concrete stump with stored rubbish in the subfloor void
FAQ
What if there is no subfloor access?
We report the limitation clearly. Inaccessible areas cannot be fully assessed — that itself is important information before you buy.
Do you treat termites from the subfloor page?
We identify conducive conditions and evidence during inspection. Treatment is a separate licensed pest management service if needed. See our Termites hub for deeper education.