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Diagnostics

Drain Odour Investigation

If it smells like drains, there's a reason. Let's find it.

Bad drain smells inside a property almost always trace back to a broken seal, a dry trap or a failed air-admittance valve. We use smoke testing, dye tracing and CCTV to isolate the source and put in a permanent fix — not just a masking spray.

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Warning signs

Sewer smells in a specific room
Smells stronger when the boiler or extractor runs
Bad odour near a downstairs WC or utility

Common causes

Dry trap in an unused fixture
Failed air-admittance valve in the loft
Cracked soil stack in a wall cavity
Rat activity in a broken lateral

Our process

How we handle drain odour investigation

01

Symptom mapping

When, where and under what conditions the smell appears.

02

Smoke testing

Non-toxic smoke shows where air is escaping the drainage system.

03

Repair

AAV replaced, trap re-primed or cracked pipe repaired.

Kit we bring

Smoke test kits
AAV replacement stock
Endoscope cameras

While you wait — do

✓ Run water through unused fixtures monthly to refill traps

Please don't

✕ Don't mask the smell — you're delaying a real repair

Common questions

Can rats cause drain smells?▾

Yes — rats break into drainage from disused lateral connections and can carry smells with them into wall cavities.

Related services

CCTV Drain Surveys

HD in-pipe cameras diagnose the exact problem — full video report same day.

Drain Repairs & Patch Lining

Cracked, offset or collapsed drains repaired properly.

Where we deliver this service

London and a 25-mile radius of East Grinstead. Popular locations:

East Grinstead Crawley Horley Lingfield Forest Row Hartfield Copthorne Dormansland Turners Hill Ashurst Wood Edenbridge Haywards Heath Burgess Hill Uckfield Crowborough Redhill All areas →

Blocked drain? Not for long.

Speak to a real engineer in under 20 seconds. 24/7, 365 days a year.

Call 24/70330 1331 347

Call 0330 1331 347