Where Hillingdon's Rats Come From
Waterways and ditches at Harefield
Harefield sits right against the Colne Valley's rivers, reservoirs and drainage channels, and rats here often travel along the water's edge rather than up through a house drain. A burrow near a garden fence backing onto open water is usually the first thing to check before assuming a plumbing fault.
Older drain runs in Hayes near the canal
Hayes's terraced streets close to the Grand Union Canal sit on drainage laid long before the area's later warehousing and infill housing arrived. A cracked pipe or displaced joint under an older terrace can let rats up into floor voids with no visible hole outside, which is the usual sign of a drainage cause rather than a garden one.
Signs to Look For
- Dark, tapered droppings roughly 1–2cm long, often in small groups
- Greasy smear marks along skirting boards, pipes and the edges of holes
- Gnawing on wood, plastic, food packaging or cables
- Scratching in ceilings, walls or under the floor, mostly at night
- Burrows a few centimetres across in soil, under paving or beside a shed
- A stale, ammonia-like smell in cupboards or under the stairs
Closing the Gap So the Rats Don't Come Back
Whether the route in is a waterway edge or an old drain, closing it matters as much as treating what's there — we'll talk you through the next step.
