Your house is on the menu.
Borer larvae eat structural timber from the inside, and Christchurch’s older timber homes are exactly what they are looking for. The treatment is sub-floor and roof-void work during flight season, sold with a multi-year guarantee and a certificate rather than a price list. Here is what the market looks like, and the two operators who publish their guarantees.
Is this your stream?
Exit holes in joists, rafters or piles, frass (fine sawdust) beneath timber, or an older home being prepped for sale or insurance. That is a structural job: sub-floor and roof-void treatment with a written guarantee.
A single piece of furniture with exit holes is a smaller, separate job, not a whole-structure treatment. And if what you are seeing is ant trails or rodent droppings rather than frass, switch streams: the structural timber pest in Christchurch is borer, not ants.
How the pricing works
Inspection first
Christchurch operators quote after inspection and publish guarantees (5–10 years) rather than prices. The guarantee is the published thing; the price follows the inspection.
The NZ-wide signal
NZ-wide signals put comprehensive treatment from around $950, with older homes around $2,000 at the top end with a 10-year warranty. Extensive damage is what pushes a job to the top.
Why it matters
The certificate of treatment is the document that carries weight for insurance and sale. A treatment without a certificate is worth less at the moment it needs to be proven.
Christchurch borer specialists, compared
Honest note: borer is the one stream with a genuine specialist market, and our data names two operators who publish guarantees rather than prices. Franchises will quote the work too, but the published warranties sit here.
Common mistakes
Treating borer like a surface insect problem: it is a structural job in sub-floor and roof-void timber, quoted after inspection, not a spray-and-go callout.
DIY on structural timber: surface furniture is one thing; the sub-floor and roof-void treatment that protects the frame is not a DIY task for structural timber.
Accepting a guarantee that is not in writing: ask for the certificate of treatment. It matters for insurance and sale, and a verbal warranty is not the same document.
Getting one quote and assuming the price is the market: borer is quote-based and the range is wide, roughly $950–$2,000. Older homes with extensive damage run to the top of the range.
Ignoring the sub-floor in the quote: the treatment is sub-floor and roof-void flood spray or injection. A quote that skips the sub-floor is not quoting the same job.
FAQ
How much does borer treatment cost in Christchurch?
Christchurch operators quote after inspection and publish guarantees (5–10 years) rather than prices. NZ-wide signals put comprehensive treatment from around $950, with older homes around $2,000 at the top end with a 10-year warranty.
How does borer treatment work?
Sub-floor and roof-void flood spray or injection during flight season, targeting structural timber. It is a whole-structure job, which is why it is inspected and quoted rather than priced off a list.
What guarantee should I expect?
Five to ten years with a certificate of treatment. Enviroban publishes up to 5 years; Pest Control Services Ltd publishes a 10-year warranty. Ask for the certificate either way: it matters for insurance and sale.
Can I DIY borer?
Not on structural timber. A single piece of furniture is a different job; the sub-floor and roof-void treatment that protects the house frame is a specialist's work.
Is treatment worth it on an older home?
Older Christchurch timber homes are the target market for this work. Extensive damage runs to the top of the price range, and the certificate of treatment carries weight at sale.
Borer is a structural job, not a pest callout: sub-floor and roof-void treatment during flight season, quoted after inspection, roughly $950–$2,000 across the market. The market runs on guarantees: Enviroban publishes up to 5 years, Pest Control Services Ltd publishes a 10-year warranty with a certificate. Get the certificate either way, because it matters for insurance and sale. DIY belongs nowhere near structural timber.