The threadbare edge of the carpet did not get there by itself.
Christchurch's older villas and wool carpets are exactly what case-bearing clothes moth larvae want: dark, undisturbed and full of keratin. The moths you see flying have already laid their eggs; the larvae chewing the base of the pile are the real job. Treatment is a residual spray across every carpeted area, sometimes paired with a deep clean, and nobody locally publishes a price, so quotes matter.
Is this your stream?
Threadbare patches behind and under furniture, along skirting and at carpet edges, tiny fibre cases that look like rolled bits of carpet, or small brown moths gathering in the upper corners of rooms. That is clothes moth or carpet beetle larvae, and this stream covers the treatment.
Small round flight holes in floorboards or joinery are borer, a different job with different operators. And if the only damage is a couple of stored jumpers, a wardrobe clean-out, hot wash and sealed storage may fix it without a spray.
What it costs in Christchurch
The honest local answer
No Christchurch operator we found publishes a carpet moth price. Every local job is quoted after someone looks at the house, the carpet area and whether wardrobes and rugs are involved.
The guide estimate
An Auckland operator's guide puts professional fabric pest treatment at $175–$310. Use it as a guide estimate for a Christchurch quote, not as a local price.
The published NZ anchor
Wellington's Combat Pest Control publishes $300 per dwelling for a combined carpet beetle and moth treatment with 6 months or more of protection. The clearest published NZ benchmark to sanity-check a quote against.
Christchurch providers, compared
Five operators that handle carpet moth and fabric pest work, grouped by what they are best at. Hover a row for the detail that matters.
Common mistakes
Spraying the flying moths and relaxing: Christchurch Pest Control's own guide spells it out: flying females have already laid their eggs, so killing the adults you see does very little. The larvae in the carpet pile are the damage.
Treating only the bald patch: larvae prefer darkness and work under furniture, along skirting boards and at carpet edges. A treatment that misses the undisturbed zones misses the infestation.
Confusing moth damage with carpet beetle: case-bearing moth larvae drag a portable fibre case and look like tiny rolled bits of carpet, while carpet beetle larvae are hairy woolly bears that leave shed skins. Borer never touches carpet at all; it is a timber pest.
Relying on a clean alone: hot water extraction knocks numbers back, but Advanced Carpet Cleaning warns it only takes a couple of survivors for the problem to continue. Clean plus treatment, not clean instead of treatment.
Replacing carpet without treating first: Kiwicare's case moth advice is to spray floors and skirting before laying new carpet if the old one was badly damaged, otherwise the larvae welcome the new wool.
Forgetting the wardrobe: the same moths eat wool knitwear, rugs and felt. Bag, seal, hot wash or sun infested clothing while the carpet is treated, or the moths simply relocate.
FAQ
How much does carpet moth treatment cost in Christchurch?
No Christchurch operator we found publishes a carpet moth price, so every local job is quoted. The two nearest public anchors: Wellington's Combat Pest Control publishes $300 per dwelling with 6 months or more of protection, and an Auckland operator's guide puts professional fabric pest treatment at $175–$310. Treat those as a guide estimate only until you have a Christchurch quote in hand.
How do I tell carpet moth from carpet beetle or borer?
Case-bearing clothes moth larvae look like tiny rolled pieces of carpet with a brown head poking out, and the adults are small brown moths that gather in the upper corners of rooms. Carpet beetle larvae are hairy woolly bears that leave shed skins. Borer leaves small round flight holes in timber and never touches carpet. The damage pattern is the tell for all fabric pests: threadbare patches in dark, undisturbed areas.
What does a professional treatment involve?
A residual insecticide across all carpeted areas, concentrated behind and under furniture, timed to keep killing larvae as they hatch from eggs deep in the pile. Advanced Carpet Cleaning pairs this with hot water extraction and an Integrated Pest Management plan. Badly infested loose rugs may need removal, hot washing or freezing rather than spraying.
Can I treat carpet moth myself?
For a small early catch, yes. Kiwicare's case moth guide: vacuum thoroughly, lift carpet edges and spray underneath and lightly on top with a residual product, monitor with clothes moth traps, and re-spray carpet edges every 6 months. Christchurch Pest Control also offers free phone advice if you want a second opinion before committing.
How do I stop them coming back?
Vacuum under furniture and along edges regularly, because undisturbed wool is the target. Strong sunlight kills clothes moths, so sun blankets and loose rugs. Keep off-season woollens clean and sealed in bags, since larvae prefer fibres soiled with sweat. In a wool-carpet villa that has had them before, keep the 6-month edge spray rhythm going.
Christchurch prices are quote-based; sanity-check against the $175–$310 guide band and Wellington's published $300 per dwelling. Christchurch Pest Control gives free phone advice and knows the pest; Advanced Carpet Cleaning combines deep clean with treatment; Tom's names carpet moth as a service; Rentokil and Flick suit severe or whole-house infestations. Treat every carpeted room, not just the patch, and treat the wardrobe at the same time.