Discovering termite damage during renovation changes the order of decisions. First establish whether termite activity is present and whether the affected structure is safe. Then determine the extent of damage, arrange treatment and design the necessary repairs. Replacing visible timber without addressing termite activity can leave the house exposed, while treating termites does not restore the strength of damaged framing.
For an Australian homeowner, pest management and building repair are connected but separate scopes. A pest professional assesses activity and recommends management. A builder and, where needed, structural engineer assess the damaged construction and specify repairs. Coordinating those roles before new linings go on is far more useful than choosing a chemical treatment and assuming the renovation can continue unchanged.
What to do when damage is uncovered
Stop disturbing the affected area and tell the builder. Keep people away from flooring, stairs or other components that may have lost strength. If there is an immediate stability concern, the builder should arrange appropriate professional assessment and temporary protection. Do not probe load-bearing timber, remove supporting members or apply household insecticide as an improvised solution.
Preserve information that may help the pest inspection. Photograph the discovery from a safe location and note where it sits on the floor plan. Record what was removed and whether live insects or mud-like workings were observed. Avoid cleaning everything away before the pest professional attends unless immediate safety measures require it. The aim is to support assessment, not to diagnose the species yourself.
Tell the team about any previous treatments, inspection reports and termite-management notices available for the property. Older documents can reveal the intended system and areas requiring access. They do not prove that the present house is protected, particularly if later renovations changed landscaping, slabs or service penetrations.
Separate three questions before approving repairs
Is there current activity?
A suitably qualified pest professional should assess current activity and recommend an appropriate management approach. Hidden areas can limit an inspection, so ask the report to identify inaccessible zones and recommended follow-up. A statement that no live termites were seen in an accessible area is not equivalent to a guarantee that none exist anywhere in the building.
What has been damaged?
The building assessment should map affected members and distinguish superficial appearance from structural capacity. Damage may extend beyond the timber first exposed. A builder may need controlled opening of adjacent finishes, coordinated with the pest professional and engineer. Specify who authorises that investigation and how its cost is recorded before demolition expands.
Do not equate treatment completion with repair completion
Even successful pest treatment leaves existing timber damage in place. A member that can no longer perform its structural function still requires the repair or replacement specified by the responsible professional. Conversely, replacing damaged timber does not establish that termite management is complete. Keep separate sign-offs for the pest scope and the building scope.
How will future inspection remain possible?
Your Home notes that timber framing can be vulnerable to termite attack and that using steel framing does not remove the need for termite protection for the whole home. Ask how the renovation affects inspection access and the existing management system. New cabinetry, paving or insulation should not casually conceal areas that the pest professional needs to examine later.
Map the repair before replacing everything
Ask the builder to prepare a marked plan or photographs identifying damaged studs, plates, joists, bearers or other components. The repair specification should explain which members are retained, repaired or replaced and why. A blanket instruction to “replace termite-damaged timber” leaves too much room for disagreement about the extent of work.
Where load-bearing members are affected, the engineer should determine an appropriate repair and any temporary support requirements. The contractor must manage sequencing so that removing damaged timber does not destabilise adjoining construction. Homeowners should not attempt structural repairs using generic timber sizes or advice intended for an unrelated house.
Some damage may be discovered only after linings are opened. Agree investigation stages so decisions remain reviewable. For example, the first stage might expose a defined wall length for inspection, followed by a priced repair proposal based on the findings. This is more manageable than authorising unlimited strip-out before anyone has described the likely consequences.
What belongs in the termite repair quotation
Separate pest treatment, structural repair and finish reinstatement. Each has different responsibilities and completion evidence. Identify whether the builder coordinates all three or whether you hold separate contracts. If separate, agree access dates, communication and who decides when the next trade can proceed.
- Pest inspection, treatment proposal and follow-up arrangements.
- Controlled opening and disposal of affected finishes.
- Structural assessment and repair drawings where required.
- Temporary support and replacement framing.
- Plumbing or electrical work affected by the repair.
- Reinstatement of insulation, linings, flooring and decoration.
- Ongoing inspection access and maintenance instructions.
Check whether hazardous-material investigation is needed before opening older linings or coatings. Termite damage does not make asbestos or lead risks disappear. Use the asbestos pre-renovation guide to prepare questions for the professionals, and have suspect materials assessed before disturbance.
Illustrative Australian repair budgets
The figures below are hypothetical planning allowances in AUD, including assumed GST. They are not national average prices and do not predict the cost of an infestation. The extent of concealed damage, access, structural complexity and finish standard can produce very different quotations.
| Illustrative repair scope | GST-inclusive planning allowance | Main assumptions |
|---|---|---|
| Localised non-structural reinstatement after assessment | AUD $3,000–$8,000 | Limited accessible damage, modest finishes, treatment priced separately |
| Defined wall or floor-framing repair | AUD $12,000–$30,000 | Professional repair scope, temporary support and ordinary reinstatement |
| Extensive concealed structural damage | AUD $35,000–$80,000 or more | Multiple areas, substantial opening, services and finish reconstruction |
Keep treatment costs visible as a separate line unless the quotation expressly includes them. Likewise, do not assume the repair budget includes relocation, lost rental income or a complete room upgrade. If you choose better joinery or new flooring while an area is open, show that as an owner-selected improvement rather than attributing every dollar to termite damage.
A hypothetical GST-inclusive budget could allocate AUD $1,200 to initial pest assessment, AUD $2,800 to building investigation and design, AUD $15,000 to specified repairs and AUD $5,000 to reinstatement. That totals AUD $24,000 before a separately quoted treatment package and any reserve. The example illustrates accounting structure, not recommended fees. Use your actual quotations when updating the renovation budget.
Why concealed damage changes the programme
Discovery can affect more than the carpentry date. Investigation may pause demolition, treatment may need coordinated access, and structural repairs may require design or inspections. Cabinet measurements and floor finishes may need to wait until the underlying construction is sound. Ask the builder for a revised sequence with dependencies, rather than an unsupported promise to recover every lost day.
Move decisions that do not depend on the damaged area forward where sensible, but avoid ordering fitted items from dimensions that may change. A damaged wall plate or floor frame can affect the final geometry of a room. Our guide to planning a renovation timeline helps distinguish tasks that can proceed from those awaiting investigation.
Do not close the wall simply to preserve the original plastering booking. Agree inspection points with the pest professional, builder and engineer. Photographs are valuable records, but they do not replace an inspection when one is required. Make sure everyone knows who authorises concealment and what documentation should be retained.
Repair moisture and access problems at the same time
Ask the pest professional about conditions that may contribute to risk, including leaks, concealed entry paths and obstructed inspection areas. The appropriate response depends on the house and management system. Avoid creating a universal checklist of chemical products; the task is to understand your property’s vulnerabilities and the maintenance expected after treatment.
Where water damage and termite damage coexist, arrange both investigations. A damp subfloor may also contain decayed timber, and the repair needs to address all relevant deterioration. The article on replacing rotten joists and bearers explains how to discuss the horizontal floor structure with the builder.
Review proposed paving, garden beds, storage and enclosed decks before finalising the renovation. Ask whether they interfere with the existing termite-management arrangement or future inspection. Record agreed changes on the drawings so they are not lost when the landscaping contractor arrives months later. Good access is easiest to preserve before finishes and external levels are fixed.
Choose contractors for their defined responsibilities
Check the pest professional’s applicable qualifications and licensing in your jurisdiction, and verify the builder’s registration or licence for the repair work. Ask who carries responsibility for structural design and any required approvals. One contractor may coordinate the project well, but coordination should not obscure which specialist is responsible for each conclusion.
Request written treatment and repair proposals. They should identify the inspected areas, limitations, scope, price, follow-up and exclusions. A warranty needs to be read alongside inspection and maintenance conditions. It should not be described as a promise that the entire house can never be attacked again. Use practical questions for a builder to clarify the construction side before signing.
Where quotations differ, compare the areas included and the finish standard. One builder may replace a complete wall lining while another allows only a patch. One may include engineer visits, another may exclude them. These differences can explain a substantial price gap without either contractor being unusually cheap or expensive.
Insurance and contract changes
Contact your insurer with the facts and ask what, if anything, the policy covers. Do not assume termite treatment or deterioration is insured. Cover depends on the policy and circumstances, and any claim decision should come from the insurer. Keep reports and photographs, and obtain instructions before discarding material if a claim is being considered.
If the discovery changes an existing renovation contract, request a documented proposal showing the added scope, cost and programme effect. Clarify whether investigation was included in the original contract and what remains uncertain. The general guide to hidden renovation costs can help you separate unavoidable discoveries from unrelated upgrades.
Handover should include a future inspection plan
Retain pest inspection reports, treatment records, structural drawings, photographs of repaired framing and any required completion documents. Keep the location of access panels and inspection areas on a simple plan. Ask the pest professional to explain the recommended review arrangements for the actual system installed, including what changes should prompt earlier contact.
Give future trades a brief note about the termite-management arrangement before they alter the house. A new service penetration, outdoor slab or built-in enclosure can affect details that were carefully coordinated during repairs. The documentation is useful only if the people making later changes know it exists.
After the renovation, keep access routes available and report new signs promptly. Follow the professional’s maintenance instructions rather than substituting a generic annual checklist for a system-specific plan. Termite management is an ongoing responsibility, and clear records make that responsibility easier to maintain.
A controlled response protects the renovation
The discovery of damage is disruptive, but it does not justify rushed decisions. Establish safety, assess activity, map the damage and agree the repair before new finishes hide the structure. Keep treatment, building repair and upgrades separate in the budget so you can make informed choices about each.
A related guide to consider while planning this work is Can You Keep Cabinets After Water Damage?.
Ask the project team to show how the repaired structure will be inspected and maintained after handover. A successful result is more than new timber behind fresh plaster: it is a sound repair, a suitable pest-management approach and a practical way to keep checking the house. Those outcomes provide a better basis for continuing your renovation than a quick patch and an unqualified reassurance.
For a staged project, identify which rooms can remain in use and which must be isolated while damaged framing is assessed. A wall that appears intact from the living room may have a different condition behind its lining. Let the builder and engineer determine safe occupation arrangements, and revise them if investigation uncovers additional damage. Household convenience should be planned around those findings.
Before replacing decorative timber, ask whether a representative piece should be retained for matching profiles or documenting the original construction. Any retained material must be handled as the pest professional directs and stored appropriately. This can help reproduce a skirting or architrave accurately without allowing salvage decisions to interfere with treatment, disposal or site safety. Record which heritage details are to be replicated so the repair quotation includes the required workmanship.