When are woodworm most active?

Woodworm are typically adults emerge May–July.

What is woodworm activity commonly mistaken for?

Woodworm are most often confused with powder-post-beetle. Use two pieces of sensory evidence — droppings plus sound, or smell plus damage — before you commit to a treatment plan.

Is it legal to treat woodworm yourself in the UK?

Woodworm are not a protected species in the UK and can be controlled without a licence, but you must use approved methods. The Prevention of Damage by Pests Act 1949 also obliges occupiers to keep premises free of rats and mice — councils can serve notice if they don't.

Is my landlord or me responsible for woodworm removal in a UK rental?

If you rent, the landlord is normally responsible for woodworm when the cause is structural (gaps in brickwork, broken air-bricks, drain defects, shared loft) or when the infestation pre-dates your tenancy. Tenants are usually liable when the cause is hygiene, food storage or items they brought in. Report it in writing first — that creates the paper trail councils and deposit schemes look for.

Will my UK council deal with woodworm for free?

Most UK councils still offer woodworm treatment, but coverage varies sharply. Around a third now charge £70–£180 per visit, some only treat rats and mice for free, and waiting lists in cities can run 1–3 weeks. A private BPCA-member controller is typically same-day or next-day and gives you a written guarantee, which councils rarely do.

Signs of
woodworm
in the house.

Fresh round exit holes 1–2mm wide in a piece of timber, with pale 'frass' (wood dust) underneath, is the everyday opener.

Confidence rule — Fresh, pale frass means active woodworm. Grey, compacted frass usually means a historic infestation that's already gone.

◉ Four senses — what to check

See it. Hear it.
Smell it. Find it.

01 — See

Round exit holes and pale frass

Round flight holes 1–2mm in diameter, often on the underside of timbers. Fresh frass is the colour of the timber underneath; old frass goes grey.

02 — Hear

Rare ticking in heavy infestations

Deathwatch beetle (one of the species included under 'woodworm') makes a faint ticking from inside structural timbers — rare in modern UK homes, common in older oak frames.

03 — Smell

No reliable woodworm odour

Damp timber smells — but that's the conditions that allow woodworm, not the beetles themselves.

04 — Damage

Structural weakening of joists and floorboards

Floorboards that flex underfoot more than they used to, hollow-sounding joist ends, and visible tunnelling where a board has been lifted.

◉ Where they shelter

Inside the timber itself.

Larvae spend 2–5 years tunnelling inside the timber before emerging as adults — which is why a survey assesses age and activity, not just hole count.

◉ When activity peaks

Woodworm are
adults emerge May–July.

Time of activity is one of the fastest ways to confirm a species — daytime loft noise rules out rats, midnight kitchen scuttling rules out squirrels.

◉ Urgency trigger

When to call today, not next week.

Holes appearing in load-bearing timbers (joists, lintels, roof trusses) — these need a structural survey alongside treatment.

Emergency woodworm response →

◉ Still not sure — rule these out

Often mistaken for woodworm.

Compare
Signs of powder post beetle
Open guide →

◉ UK FAQ — woodworm

Questions UK households
ask about woodworm.

What are the first signs of woodworm in a UK home?: Fresh round exit holes 1–2mm wide in a piece of timber, with pale 'frass' (wood dust) underneath, is the everyday opener.
When are woodworm most active?: Woodworm are typically adults emerge May–July.
When should I call a pest controller about woodworm?: Holes appearing in load-bearing timbers (joists, lintels, roof trusses) — these need a structural survey alongside treatment.
What is woodworm activity commonly mistaken for?: Woodworm are most often confused with powder-post-beetle. Use two pieces of sensory evidence — droppings plus sound, or smell plus damage — before you commit to a treatment plan.
Is it legal to treat woodworm yourself in the UK?: Woodworm are not a protected species in the UK and can be controlled without a licence, but you must use approved methods. The Prevention of Damage by Pests Act 1949 also obliges occupiers to keep premises free of rats and mice — councils can serve notice if they don't.
Is my landlord or me responsible for woodworm removal in a UK rental?: If you rent, the landlord is normally responsible for woodworm when the cause is structural (gaps in brickwork, broken air-bricks, drain defects, shared loft) or when the infestation pre-dates your tenancy. Tenants are usually liable when the cause is hygiene, food storage or items they brought in. Report it in writing first — that creates the paper trail councils and deposit schemes look for.
Will my UK council deal with woodworm for free?: Most UK councils still offer woodworm treatment, but coverage varies sharply. Around a third now charge £70–£180 per visit, some only treat rats and mice for free, and waiting lists in cities can run 1–3 weeks. A private BPCA-member controller is typically same-day or next-day and gives you a written guarantee, which councils rarely do.