Expert Advice

Signs of Woodworm in Your Property

Published: 2026-02-11 • Written by Parkside Construction

Woodworm is the generic term for the larvae of any wood-boring beetle (such as Common Furniture Beetle and Death Watch Beetle) that consumes timber structures over multiple years. In the UK, early diagnostics can prevent severe floor sagging and structurally weakened rafter joints.

Recognising Active Infestations:

  • Exit Holes: Tiny circular holes (1mm to 2mm wide) on timber sides.
  • Bore Dust (Frass): Very fine timber sawdust piled immediately below exit holes. Creamy white color indicates active larvae.
  • Structural Softness: Rotting wood edges that crumble easily when pressed with a flat screwdriver.

How do surveyors verify activity?

Older historic exit holes can remain dry for decades after beetle colonies leave. Our Level 3 checks verify whether wood rot fungi are present to support larvae growth, and examine frass under light lenses to recommend water-soluble permethrin insect wash treat profiles.

Concerned About Active Loft Woodworm?

Get an independent timber, damp and pest diagnostic audit. Call our experts today.

Request Rafter Timber Survey