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Home › Blocked Drains › Drain Smell Investigation

A drain smell in your home is unpleasant, embarrassing, and it doesn't just go away on its own. It means something's wrong: a dried-out trap, a cracked pipe venting sewer gases, a blocked drain with standing water, or a failed seal somewhere. The smell gets worse in warm weather and after rain, and it's not just unpleasant, sewer gases contain harmful bacteria. In older Nottingham properties around Carlton, Mapperley, and Sherwood, dried-out traps and cracked clay drains are common causes.

We don't mask smells with chemicals, we find the source and fix it properly. Our engineers use smoke tests to trace where gases are escaping, CCTV cameras to inspect drains for cracks and blockages, and water tests to check if traps are functioning. Once we've found the problem, we fix it on the spot where possible.

We operate across all Nottingham areas with same day service. No call-out fee. Our visit includes the first hour's labour when you book with us. Our 12-month guarantee is included with our membership plan, which also includes £50 off all our services, discounts on parts, £80 off our appliance store, and priority service.

Common Causes of Drain Smells

Drain smells have specific causes. Here are the most common we find in Nottingham homes:

Dried-out trap

Every drain has a U-bend trap that holds water to block sewer gases. If a drain isn't used for weeks, the water evaporates and gases come up. Spare bathrooms, utility sinks, and floor drains often dry out. Pouring water down restores the seal.

Partially blocked drain

A slow drain with standing water breeds bacteria that produces foul smells. The blockage might be grease, hair, or debris buildup. Clearing the drain fixes the smell.

Cracked or damaged pipe

Cracks in underground drains let sewer gases escape into the soil, then up through airbricks or floor voids. CCTV inspection finds the crack, and we repair or line the pipe.

Faulty toilet seal

The wax or rubber seal at the base of the toilet can fail, letting sewer gases seep into the bathroom. If the smell is strongest near the toilet, the seal needs replacing.

Missing or damaged drain cover

External gullies and inspection chambers should have sealed covers. If a cover is missing, cracked, or doesn't seal properly, you'll smell drains in the garden and sometimes inside via airbricks.

How We Investigate Drain Smells

We use systematic methods to pinpoint the source:

1

Interview and inspect

We ask where the smell is strongest, when it's worse, and if any drains are slow. We check all traps, toilets, gullies, and manholes for obvious issues.

2

Smoke test

We introduce harmless smoke into the drains. It escapes wherever there's a crack, missing seal, or dried-out trap. This pinpoints the exact location without guesswork.

3

CCTV drain inspection

We send a camera down the drains to look for cracks, collapses, or blockages. Any defect that could be venting gases shows up on the screen.

4

Check all traps

We test every sink, shower, bath, and floor drain to make sure the traps are holding water. We fill dried-out traps and check for trap seal failures.

5

Repair the source

Once found, we fix it: refill a dried trap, clear a blockage, replace a toilet seal, repair a cracked pipe, or fit a new manhole cover. The smell stops immediately once the source is sealed.

Quick Checks You Can Do

1

Pour water down all drains

Start with the simplest fix. Pour a bucket of water down every drain in the house, including floor drains and outside gullies. If a trap was dried out, this will restore the seal and stop the smell.

2

Check external gullies

Go outside and check all drain gullies. Are the covers in place and sealed? Is there debris blocking the grating? A clogged gully smells terrible and is usually visible.

3

Inspect under sinks

Look under every sink and basin. Is the trap connected properly? Any visible cracks or loose connections? A loose waste pipe vents smells straight into the cupboard.

4

Check the toilet seal

Push the base of the toilet gently. If it rocks, the seal has failed. Smell near the base, if it's strongest there, the wax ring needs replacing.

Drain Smell Investigation Pricing

Upfront prices, no nasty surprises

We'll always tell you the cost before we start. These are typical price ranges, your exact quote depends on the job.

ServiceTypical Cost
Drain smell investigation£80-£120
Smoke test (included in investigation)£0
CCTV drain survey£100-£180
Trap replacement or repair£75-£140
Toilet seal replacement£90-£150

All prices are estimated. Final costs depend on the specific job. We provide detailed quotes before starting work.

Common Questions

Got questions? Here's the quick answers.

How much does drain smell investigation cost in Nottingham?
Investigation costs £80-£120, smoke testing is included across Nottingham and surrounding areas. CCTV drain surveys cost £100-£180 if needed. Simple fixes like refilling dried traps are free with the investigation. Repairs like trap replacement cost £75-£140, toilet seals £90-£150.
How long does it take to find a drain smell?
Simple issues like dried traps take 15-30 minutes. Smoke tests and CCTV investigations take within 2 hours. Most sources are identified within an hour, then we fix it on the spot if parts are available, whether you're in City Centre, West Bridgford, or Beeston.
Can I fix a drain smell myself?
Try pouring water down all drains first, especially ones you don't use often. Check external gullies for blockages. If the smell persists, it's likely a crack, failed seal, or hidden blockage that needs professional investigation We cover all Nottingham areas including NG1, NG2, and NG9 postcodes.
Why does the smell get worse after rain?
Rainwater fills the drains and forces sewer gases out through any crack or defect. If the smell worsens in wet weather, you've got a cracked pipe or failed seal somewhere. CCTV inspection will find it We cover all Nottingham areas including NG1, NG2, and NG9 postcodes.
Why does the smell come and go?
Intermittent smells often mean a trap is borderline dry. It seals when water sits in it, then gases escape as the water evaporates. Regular use of that drain keeps the trap full and stops the smell We cover all Nottingham areas including NG1, NG2, and NG9 postcodes.
What's a smoke test?
We introduce harmless smoke into the drain system. The smoke is visible and escapes wherever there's a leak, crack, or dried trap. It's the fastest way to pinpoint exactly where gases are escaping We cover all Nottingham areas including NG1, NG2, and NG9 postcodes.
Will CCTV find the problem?
CCTV shows cracks, collapses, root intrusion, and blockages inside the drain pipes. If the smell is from a damaged pipe, CCTV will find it. For dried traps or external issues, visual inspection and smoke tests are better We cover all Nottingham areas including NG1, NG2, and NG9 postcodes.
Can drain smells be harmful?
Sewer gases contain methane and hydrogen sulfide, both unpleasant and potentially harmful in concentration. They also indicate unsanitary conditions. Don't ignore drain smells, get them investigated and fixed We cover all Nottingham areas including NG1, NG2, and NG9 postcodes.
My bathroom smells even though the drains are clear, why?
Check the toilet seal. If it's failed, sewer gases escape from under the toilet. Also check shower traps, they can dry out if the shower isn't used regularly. Both are simple fixes We cover all Nottingham areas including NG1, NG2, and NG9 postcodes.
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