★★★★★ 4.9/5 · 500+ reviews
The National Drainage Company clears blocked drains across Harrow 24/7, covering the HA postcodes — Harrow town, Wealdstone, Pinner, Stanmore and Harrow-on-the-Hill. Pre-agreed prices, fast local response.
Harrow is classic Metroland: street after street of 1920s and 1930s semi-detached houses, built as the Metropolitan line pushed out. That inter-war stock runs on clay drainage now approaching a century old, with shared drains between semis and joints that have opened up to root ingress from mature gardens and street trees. The hillier ground around Harrow-on-the-Hill and Stanmore adds surface-water runoff, while London's clay subsoil keeps soakaways under strain. Blocked shared drains, root ingress and ageing clay pipes are the everyday Harrow jobs we handle.
Older terraces run on clay pipework that tree roots find and split at the joints.
Kitchens and food businesses keep drains under constant FOG pressure.
Converted flats share soil stacks, so one wipe can back up several homes.
Older surface drains and gullies silt up and struggle in heavy rain.
"Fast, tidy and did exactly what they said. Couldn't fault them."
"Showed me the problem on camera and sorted it properly. No hard sell."
"Reliable and professional — one call and it was handled."
| Area | Approx. response |
|---|---|
| Wealdstone | ~11 min |
| Pinner | ~14 min |
| Stanmore | ~19 min |
| Harrow-on-the-Hill | ~10 min |
| Rayners Lane | ~7 min |
| North Harrow | ~15 min |
| South Harrow | ~8 min |
| Kenton | ~18 min |
| Edgware | ~12 min |
We aim to reach most jobs in Harrow within 60 minutes, 24/7. Call us and we'll confirm an arrival time for your postcode.
Shared drains are the norm in Harrow's inter-war semis. We help establish responsibility before any work and clear the shared run.
You're normally responsible for pipes within your boundary; the shared sewer beyond is usually Thames Water's.
Yes — we cover Harrow and the surrounding area around the clock, 365 days a year, for both emergency and planned drainage work.
Yes — as well as homes we look after shops, restaurants, offices, care homes and property managers throughout Harrow.
Yes — we're fully insured, our engineers are DBS-checked, and we hold recognised industry accreditations including Water Jetting Association membership.
We confirm the drain is flowing freely before we leave, and if a blockage returns because we didn't clear it properly, we'll come back and put it right.
Wherever possible we use no-dig methods such as relining and localised patch repairs, so there's little or no excavation.
The same team, kit and pre-agreed price promise wherever you are in Harrow — jetting, CCTV and no-dig repair carried on every van.
24/7 local response, pre-agreed price before any work, fully insured.
📞 Call now: 0800 246 5157
