General guidance, not an inspection or diagnosis. Repair advice has not been independently reviewed by a tradesperson. About this checker and safety sources.
What to do now
Avoid heavily loading a visibly failing area. If the floor is rapidly collapsing or unsafe to walk on, keep clear and arrange urgent assessment.
Common causes
- Rot or moisture damage
- Termite damage
- Failed joist / bearer / support
- Foundation or stump movement
The exact cause cannot be confirmed from a symptom alone. The first professional should inspect before repair work is authorised.
What usually happens next
- Inspect subfloor where safely accessible
- Check for moisture / termite evidence
- Assess structural members
- Repair cause and then damaged floor
What should I ask about the price?
Ask for an itemised quote covering the inspection or call-out fee, labour, materials, GST, access, disposal and any after-hours charge. Ask what happens if extra damage is found. A reliable price needs details of the actual job; this guide does not provide an estimate.
Who may be responsible?
Owner / landlord
Structural floor defects usually sit with the property owner. Tenants should report them promptly rather than attempting repairs.
Tenancy, strata, insurance and boundary responsibilities vary by circumstance and state, so confirm responsibility before non-emergency work where practical.
Questions to ask before hiring
- Are you appropriately licensed or registered for this work in my state?
- Does the quote include call-out, labour, parts/materials, GST and disposal?
- What is excluded from the quoted scope?
- If you find additional damage, will you get approval before doing extra work?
- What workmanship or product warranty applies?
Run this problem through the checker, then contact a suitable professional of your choice.
Run floor feels soft or sinking triage →