FS Group engineer clearing a drain in a narrow side alley

Drainage services in South West London

Reliable drainage services South West London families and landlords call first, from Clapham to Twickenham. We find the cause on camera and fix it, with the rate agreed before we start.

  • Available 24/7, 365 days
  • Prices from £55.00 + VAT
  • 2-hour emergency response
  • 6-month guarantee

Family-run since 1998

On call day and night

Call 0800 689 3497

Trusted by homeowners, landlords and businesses across London

Why FS Group

Drain engineers for extended terraces and family houses

Our engineers cover Clapham and Brixton through Wimbledon and Sutton to Twickenham. Terraces in Battersea and Balham often have kitchen extensions built over the old drain. Larger gardens in Richmond and Twickenham bring roots into clay pipes. Relining fixes many of these without lifting a floor.

No call-out feeNo ULEZ chargeNo emergency premiumFixed-price quotes6-month guarantee, T&Cs applyFamily-run since 1998
Cheap drain unblockingFrom £55.00 + VAT

The starting rate for a standard unblock, per half hour, on weekdays 8am to 6pm. The exact rate is given on the phone first.

See all our rates

Our customers, in their own words

4.9
★★★★★
Google rating
★★★★★
Putney

The service from FS Drainage was second to nine. I highly recommend them. Mirren Putney

M
Mirren J.
Engineer visit · Reviews.co.uk
★★★★★
Mitcham

I found FS at the last minute, and they were able to find an agent to come out in a few hours which was incredible. Jordan, who attended the property, was punctual and thorough. The review of the drainage was equally thorough. I needed an honest opinion and solution to any potential issues, and that was delivered. I also felt that he was working with me, that the survey being carried out was in the interest of my future purchase of this property. I'd recommend FS to anyone who needs to review concerns from Home Buyers reports or has repairs on new purchases of any house.

A
Alex R.
CCTV drain survey · Reviews.co.uk
★★★★★

Couldn’t recommend FS Group highly enough. Had an issue with my Macerator pipes being blocked. Had someone out previously who couldn’t get the job done. It was only because of this it led me to FS who had no bother sorting it, they were quick reliable and amazing to deal with. Will never use anyone else in the future!

G
Georgia B.
Blocked macerator pipe · Google
★★★★★

Our toilet was blocked. We had 4 other plumbers come to fix it but no one could unblock it. JJ was great. Professional and unblocked it within an hour. Thanks so much!

F
Fatema A.
Blocked toilet · Google
★★★★★

FS sent their engineers the day after I called them. They knew exactly how to deal with the blocked drain at my property - and did so quickly and efficiently. I'd use FS again.

C
Chris J.
Drain unblocking · Google
★★★★★

The operatives arrived on time and dealt with a horrible drain blockage very efficiently in less than an hour. They were very friendly and informative. I would definitely use again if needed.

J
John S.
Drain unblocking · Google

Where we work

Areas we cover in South West London

Choose Battersea, Morden or anywhere else listed for its postcode and council.

No sign of your road? Call us with an SW, SM, CR4 or TW postcode and we will confirm.

More areas we cover in South West London

SW1Westminster, Belgravia, Pimlico, WhitehallSW2Brixton, Brixton Hill, Streatham Hill, Tulse HillSW3Chelsea, BromptonSW4ClaphamSW5Earl's CourtSW6Fulham, Parsons GreenSW7South Kensington, KnightsbridgeSW8South Lambeth, Vauxhall, Nine ElmsSW9Stockwell, BrixtonSW10West Brompton, ChelseaSW11Battersea, Clapham JunctionSW12BalhamSW13BarnesSW14Mortlake, East SheenSW15Putney, Roehampton, Wandsworth PlainSW16Streatham, NorburySW17TootingSW18Wandsworth, EarlsfieldSW19Wimbledon, Merton ParkSW20Raynes Park, West Wimbledon, Lower Morden

Drain ownership

Who looks after which drain

Drain on your land
The pipe that takes only your waste and stays within your boundary is yours, even under a Balham kitchen extension.
Shared drains
Pipes shared with neighbours, plus public sewers, have belonged to Thames Water since October 2011.
Gullies by the kerb
Lambeth, Wandsworth, Merton, Sutton and Richmond upon Thames councils clear road gullies. Red routes are Transport for London's.
SW, SM, CR4 and TW postcodes

South West London is full of Victorian and Edwardian terraces, and many now have extensions built over the old drains.

Who we work for

Homes, landlords and businesses

Buyers and homeowners

Buying in Putney or Wimbledon? A CCTV survey records the drain, and you get a written report.

Landlords with flats

Brixton houses split into flats often share one old drain. Landlords get the rate on the phone before any visit.

About CCTV surveys

High street businesses

Kitchens on Tooting High Street can book work after hours, overnight or on a weekend. Priority Accounts give quicker response and contract pricing.

About Priority Accounts

Drainage services we carry out

Whether it is a drain under a Clapham extension or a gully in Streatham, a single call books it. Unsure what you need? Tell us the symptoms.

How it works

What to expect when you book

1

Call, day or night

Dial 0800 689 3497 whenever you need us. If you leave details online, we phone back within 15 minutes.

2

Rate on the phone

Tooting or Twickenham, you learn your rate before anyone sets off.

3

Job done, guaranteed

The engineer clears the drain. After that, six months of guarantee covers the workmanship, T&Cs apply.

CHAS accredited contractorSafeContractor approvedWater Jetting Association member 2026Constructionline registered

What we see most

The drain problems we fix most often in South West London

Extensions over old drains

Kitchen extensions in Clapham and Wandsworth often sit over the original pipe. We survey it and reline it where we can, without digging.

Loft and basement conversions

Extra bathrooms send more water down pipes that were never sized for it. A camera shows if the drain can cope.

Buying a house

Buyers in Wimbledon and Putney often want a drain survey before they exchange. We record it and give you a written report.

Shared runs under terraces

Terraces in Clapham and Tooting often share one pipe behind the houses, so a block can affect neighbours.

Blocked yard gullies

Leaves and silt fill outside gullies in Streatham and Putney, so rainwater backs up towards the house.

High street kitchens

In Brixton and Balham, cafe and restaurant grease collects in shared drains until the water stops flowing.

Common questions from Clapham to Richmond

Do you cover Sutton and Richmond?
Yes. We cover every South West London borough. Give the help desk your postcode when you call.
Can you fix a drain under my extension without digging?
Often, yes. If the pipe is cracked but still in line, we can fit a resin liner inside it. A camera survey shows whether it is suitable.
Do you do drain surveys for house buyers?
Yes. We survey the drains, record the footage and write a report you can pass to your surveyor or lender.
How soon can someone come out?
For an emergency we aim to arrive within two hours. Other jobs are booked at a time that suits you, often the same day.
What does clearing a drain under a kitchen extension cost?
On weekdays, a standard blockage is cleared from £55.00 + VAT every half hour. That covers 8am to 6pm, and jetting, nights and weekends are charged at their own rates.
Will I pay a ULEZ charge for a visit to Mitcham?
No ULEZ charge, no premium for emergencies, and no fee for the call-out. The rate you hear is what applies.
Is drain work at my Sutton house guaranteed?
It is. A six-month guarantee comes with our workmanship, and T&Cs apply.

Need a drainage engineer in South West London?

Call now, whatever the time. If sewage is backing up, we aim to have someone there in two hours.