It usually starts small: a faint rustling inside a wall, a scatter of what looks like sawdust under the windowsill, or a few big black ants marching across the kitchen counter after dark. By the time most Surrey homeowners go looking for answers, the colony has already been working inside the wood for a while. Carpenter ants don't eat your house — but they hollow it out to live in it, and a mature nest can quietly weaken framing, sills and trim over a few seasons. They're recognized as one of British Columbia's most damaging structural pests.
The good news: caught early, carpenter ants are very manageable. The key is finding the nest — and the satellite nests — rather than just spraying the ants you can see. For fast, local help, our team handles carpenter ant control in Surrey from inspection through prevention — the same local crew behind our full residential pest control services in Surrey.
Quick answer
Carpenter ants are most active in Surrey from April through October, with winged swarmers peaking May–August. Treatment means locating the parent nest (often outdoors in a stump, tree or woodpile) plus any indoor satellite nests, treating them directly, and sealing a perimeter barrier so they can't re-establish. Spotted frass or swarmers indoors? Call 604-589-3338 for a fast inspection.
Don't wait for swarmers
Winged carpenter ants inside usually mean the nest is already in your home.
Call 604-589-3338Swarmers indoors
Winged ants at windows in spring/summer = an indoor nest, not a stray from outside.
Frass piles
Fine sawdust mixed with insect parts below trim, sills or baseboards.
Rustling in walls
A faint crinkling sound inside walls or ceilings on quiet evenings.
Carpenter Ant Season in Surrey
Surrey's mild, wet coastal climate gives carpenter ants a long active window. Here's the year at a glance so you know when to act.
Queens wake up. Overwintered colonies stir as temperatures climb. The best time to book a preventive perimeter — before trails establish.
Swarmer season (peak). Winged reproductives appear. If they show up inside your Surrey home, the nest is indoors — call right away.
Foraging in force. Nighttime trails run between outdoor parent nests and indoor satellites, following moisture and food.
Slowing, not gone. Activity drops as nests overwinter — but damage already done stays done. Off-season is a good time for repairs and exclusion.
Carpenter Ants vs. Pavement Ants: Which Do You Have?
Surrey homes get both, and they need different approaches. Telling them apart helps you describe the problem when you call. Health Canada notes carpenter ants have a narrow waist and bent (elbowed) antennae — the quickest way to rule out termites.
🐜 Carpenter ants
- Large — 6 to 13 mm, often all black
- Nest in wood (don't eat it); leave frass
- Most active at night, trailing along edges
- Winged swarmers in spring/summer
- Drawn to damp, soft or previously damaged wood
🐜 Pavement ants
- Small — 2.5 to 4 mm, brown to black
- Nest under slabs, driveways, foundations
- Trail into kitchens for crumbs and grease
- No structural wood damage
- Common around newer Fleetwood/Clayton townhomes
DIY first? Surface sprays kill the ants you see but rarely reach the nest, and store baits often miss carpenter ants entirely. If you're seeing frass or swarmers indoors, skip the trial-and-error — a targeted inspection finds the actual nest faster and cheaper than repeated bad guesses.
How Pest Detective Treats Carpenter Ants in Surrey
Pest Detective has been Canadian owned and operated since 1986 — 40 years of local experience, technicians who live and work across Surrey, full BC Pesticide Applicator licensing, and a 4.8★ rating over 176+ reviews. Here's how a carpenter ant job runs.
Inspection & nest tracing. We follow trails, check moisture-prone areas, and locate both the outdoor parent nest and any indoor satellite nests — the step DIY usually misses.
Targeted treatment. We treat the nests directly and apply product where ants travel, so the colony — not just the foragers — is eliminated.
Perimeter barrier. A perimeter barrier treatment around the foundation stops re-entry and covers spiders, earwigs and other crawlers too.
Prevention advice & follow-up. We flag the moisture and wood-contact issues that drew them in, and confirm the colony is gone on a return visit.
Perimeter protection starts at $435 (two visits, two products). Carpenter ant nest treatments are quoted after inspection. Call 604-589-3338.
Where Carpenter Ants Show Up Across Surrey
Surrey's greenbelts, ravines and older housing stock give carpenter ants exactly what they want: mature trees for parent nests and damp wood to expand into.
Whalley & Guildford
Older homes with moisture-damaged wood and aging trim — prime indoor satellite-nest territory.
Green Timbers & Bear Creek
Mature forest and park edges host outdoor parent colonies in stumps and standing dead wood.
Cloverdale & South Surrey
Treed acreages and landscaping push foraging ants from yard woodpiles toward the house.
Fleetwood & Clayton Heights
Newer townhomes near fences, decks and damp landscaping where ants nest in soft outdoor wood.
Carpenter ants are just one of several pests surging across the city right now — see our summer pest control plan for Surrey for what else to watch this season.
Keep Carpenter Ants Out: Surrey Prevention Checklist
- Move firewood, lumber and yard debris well away from the foundation — never stacked against the house.
- Fix leaks, clear gutters and improve drainage; carpenter ants follow moisture into soft wood.
- Trim tree limbs and shrubs so they don't touch the roof or siding (a direct ant highway).
- Replace water-damaged trim, sills and decking before ants find it.
- Seal gaps where utility lines, pipes and vents enter the foundation.
Year-round option
Tired of ants, spiders and rodents coming back?
Surrey's mild winters mean pests barely pause. PD Shield 365 year-round coverage bundles two perimeter treatments and 12 months of exterior monitoring into one simple plan — ideal for keeping carpenter ants and other recurring crawlers off your home.
Carpenter Ant FAQs — Surrey
Do carpenter ants actually damage Surrey homes?
Yes — over time. They don't eat wood, but they excavate galleries to nest in it. A mature colony left for several seasons can weaken framing, sills and trim, especially where wood is already damp or damaged.
I see big black ants but no damage — should I worry?
A few outdoor foragers are normal. But steady indoor trails, frass (sawdust), or winged swarmers inside point to an established nest. That's the time to get an inspection.
When is carpenter ant season in Surrey?
Roughly April through October, with winged swarmers peaking May–August. Surrey's coastal climate gives them a longer active season than the BC Interior.
How much does carpenter ant treatment cost?
Perimeter protection starts at $435 for two visits with two products. Direct nest treatments are quoted after inspection, since the price depends on nest location and access. We give transparent pricing before any work begins.
Do you offer fast service in Surrey?
Yes — we prioritize urgent calls and work to get a technician to your Surrey home as quickly as possible.
Pest Detective — Surrey
Stop carpenter ants before they cost you wood.
Local technicians • 40 years • 4.8★ over 176+ reviews • Fast service. Serving Whalley, Newton, Guildford, Fleetwood, Cloverdale, South Surrey and every Surrey neighbourhood.
Call 604-589-3338
