Basement pump stations, drains and CCTV surveys for townhouses, mansion blocks and mews houses across Kensington and Chelsea.
Kensington and Chelsea is known for its deep basements. Many townhouses and mews homes have been extended down by one or more storeys, and anything below the level of the sewer needs a pump to lift waste and water out. When that pump fails, the most expensive rooms in the house flood first.
We service and repair basement pump stations, test the floats and alarms, and respond 24/7 when one stops. We also clear and survey the drains under stucco terraces and mansion blocks, many of which are well over a century old and shared between flats.
Our crews work in London most days, and we’re used to working discreetly in occupied homes and around building managers, concierges and neighbours.
A basement pump station usually has two pumps, floats and a high-level alarm. We test every part, clean the chamber, check the control panel and give you a written report. Regular servicing is far cheaper than a flooded basement.
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If a pump has failed, a float has stuck or the control panel has tripped, we find the fault and repair or replace what’s needed. Our engineers carry the most common parts.
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Drains under Kensington’s terraces are often old clay, shared between flats, and run beneath the building. We clear blockages with high-pressure jetting and trace which section is causing the problem.
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Before a basement dig, extension or purchase, a CCTV survey shows where the drains run and what condition they’re in, with a written report and photos.
Learn moreLocal knowledge
Deep basements and very old drains.
Anything below sewer level needs a pump. Two pumps, a working alarm and annual servicing are the best protection.
Many drains run under neighbouring properties and are shared. Shared sections are usually the water company’s responsibility.
Building works often uncover old drains. A survey beforehand avoids surprises.
Local to you
We cover Kensington, Chelsea and the neighbouring parts of west London.
Kensington & Chelsea · and neighbourhoods
Surrounding areas · homes and businesses we cover
If you’re anywhere in Kensington and Chelsea, we cover you. Call with your postcode and we’ll confirm.
Why Kensington customers use us
Whether it’s a basement pump under a townhouse or a shared drain in a mansion block, here’s what you can expect.
Our engineers and most of our tanker drivers hold current confined space entry certificates, and the engineers carry the most common parts.
Emergency call-outs 24 hours a day, 365 days a year, with a real person answering the phone.
A waste transfer note with every collection, and a written report after surveys and services.
Tankers from 2,000 to 4,000 gallons, jet/vac combination units, CCTV survey kit and confined space teams for pump station wet wells.
We’ve been emptying tanks and servicing systems since long before most of the kit on the market existed.
Tanks, treatment plants, pump stations, grease traps and drains, all handled by one team.
Checkatrade
From 134 reviews · Read them
From 63 reviews · Read them
Scores as of September 2026
★★★★★Great service from the initial call to the guys that come out. And we’re at the house within 3-4 hours. That’s why we’ve always used them
Josh F. Google review
★★★★★We use Clearmasters regularly for our cesspool emptying and can't fault them at all. Always friendly and professional, both on the phone and the drivers. Online credit card payment which makes life easy. Highly recommend.
★★★★★Turned up on time, cleared the blockage with little fuss and the lads who turned up were professional throughout
How it works
The same simple process for every job.
Step 1
Call us or book online and tell us what you need. Let us know about concierges, building managers or access arrangements.
Step 2
We send the right engineer or vehicle. It helps if:
Step 3
You get a waste transfer note for anything we take away, and a written report after a survey or service. If it’s a regular job, we’ll remind you when the next one is due.
Free, no-obligation quote
Tell us what you need and we’ll come back with a price. If your basement is flooding or an alarm is sounding, call us now.
Questions answered
What homeowners, agents and building managers in Kensington and Chelsea ask us most.
At least once a year, and twice a year for busy households or stations that also take groundwater.
It’s strongly recommended. A second pump takes over if the first fails, and a high-level alarm warns you before the chamber overflows.
Stop using anything that drains to the pump and call 03333 233566. We can empty the chamber while we find and fix the fault.
Yes. A CCTV survey shows where drains run and their condition, which your architect and contractor will want to know.
Shared drains and sewers are usually the water company’s responsibility. We can find the problem and tell you whose section it’s in.
Yes. We answer the phone 24 hours a day, 365 days a year. Call 03333 233566.
Got a different question? Call 03333 233566 or send us a message.
We're independently vetted and certified so you can trust who you're letting onto your site.
Health & safety pre-qualification accreditation, verifying our processes meet recognised safety standards.
Railway Industry Supplier Qualification Scheme — approved to work safely within the rail industry supply chain.
Utilities Vetting Database membership, confirming we meet the utilities sector's supply chain standards.
Vetted and approved under the local authority's trusted trader scheme for honesty and fair dealing.
Members of the National Association of Drainage Contractors, the UK trade body for the drainage industry.
Registered with the Environment Agency, so your waste is handled and disposed of fully within the law.
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