CLEARMASTERS
Blocked drains in terraces
We clear blocked drains in Walthamstow’s terraces with high-pressure jetting and tell you whether the blockage is in your section or a shared one.
Learn moreWalthamstow is mile after mile of Victorian and Edwardian terraces, many of them extended into lofts and out at the back, and plenty split into flats. Its long street market, the High Street and the cafés and restaurants around Walthamstow Village and Hoe Street are busy all week.
Terraced houses share drains that run behind or beneath them, and kitchen extensions are often built over the top. When something blocks, neighbours share the problem. Restaurants and takeaways need grease traps emptied, and some lower-ground flats depend on pumps. On the western edge, the Lea valley reservoirs and wetlands bring a lot of water close by.
Our crews work in east London most days and we answer the phone 24 hours a day, 365 days a year.
Our Walthamstow drainage services
View all services
Blocked Drains & CCTV Surveys
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Septic Tank Surveys
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Grease Traps & Commercial Waste
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Pump Station Servicing
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Treatment Plant & Pump Repairs
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Gullies & Interceptors
Learn moreCovering
Walthamstow
Walthamstow
24/7
call-outs
call-outs
Homes &
businesses
businesses
Waste transfer
notes
notes
Own tanker
fleet
fleet
What we do for Walthamstow customers
CCTV surveys before extensions and purchases
Kitchen extensions often sit on top of shared drains. A survey before you build or buy shows where they run and their condition.
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Grease traps for the market, High Street and Village
Restaurants, cafés and takeaways need grease traps emptied regularly. We set up a schedule and leave a waste transfer note every time.
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Lower-ground and basement pumps
Lower-ground flats below the sewer rely on pumps. We service them and respond 24/7 if one fails.
Learn moreLocal knowledge
Drainage in Walthamstow: what to know
Terraces, extensions and shared drains.
Shared drains behind terraces
Many terraces share a drain run. Shared sections are usually the water company’s responsibility.
Building over drains
Kitchen extensions are often built over shared drains, which may need water company approval.
Busy food streets
Fat from restaurants and takeaways is a leading cause of blockages under the High Street.
Local to you
Areas we cover in and around Walthamstow
We cover Walthamstow and the neighbouring parts of east London.
Walthamstow · and neighbourhoods
- Walthamstow
- Walthamstow Village
- Higham Hill
- Blackhorse Road
- Wood Street
- Upper Walthamstow
Surrounding areas · homes and businesses we cover
- Leyton
- Leytonstone
- Highams Park
- Chingford
- Woodford
- Lea Bridge
- Clapton
- Tottenham Hale
- Snaresbrook
- Forest Gate
- Stratford
- Hackney
Not sure if we cover you?
If you’re in or around Walthamstow, we cover you. Call with your postcode and we’ll confirm.
Why Walthamstow customers use us
Clear answers about terrace drains
Whether it’s a blocked drain behind a terrace or a market grease trap, here’s what you can expect.
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Day and night, all year
Emergency call-outs 24 hours a day, 365 days a year, with a real person answering the phone.
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34 years in drainage
We’ve been emptying tanks and servicing systems since long before most of the kit on the market existed.
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Paperwork done properly
A waste transfer note with every collection, and a written report after surveys and services.
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The right kit for the job
Tankers from 2,000 to 4,000 gallons, jet/vac combination units, CCTV survey kit and confined space teams for pump station wet wells.
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One call for everything
Tanks, treatment plants, pump stations, grease traps and drains, all handled by one team.
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Trained engineers
Our engineers and most of our tanker drivers hold current confined space entry certificates, and the engineers carry the most common parts.
What our customers say
9.84/10
Checkatrade
From 134 reviews · Read them
4.9/5
From 63 reviews · Read them
Scores as of September 2026
★★★★★Turned up on time, cleared the blockage with little fuss and the lads who turned up were professional throughout
Chloe R. Google review
★★★★★Clearmasters have been emptying and servicing our treatment plant for the last 7 years and their service and quality of work is of a high standard. I would highly recommend them.
★★★★★Efficient, courteous, customer-facing. Would not hesitate to recommend to others.
How it works
What happens when you book
The same simple process for every job.
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Step 1
Tell us what you’ve got
Call us or book online and tell us what’s happening. If neighbours are affected too, let us know.
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Step 2
We come out and do the job
We send the right van or tanker. It helps if:
- manhole covers are clear of cars, bins and planters
- there’s somewhere nearby for our van or tanker to park
- you tell us about shared drains or neighbours who are affected
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Step 3
Paperwork and the next visit
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
Get a quote for your Walthamstow property
Tell us what you need and we’ll come back with a price. If something’s overflowing, call us now.
- Free quotes for drains, surveys and pumps
- CCTV surveys before extensions
- Grease traps for local businesses
Urgent?
03333 233566
Questions answered
Walthamstow drainage FAQs
What homeowners and businesses in Walthamstow ask us most.
The drain behind our terrace is blocked. Whose problem is it?
Shared drains serving more than one house are usually the water company’s. The section serving only your home is usually yours. We’ll find the blockage and tell you.
Can I build an extension over a shared drain?
Often, but you may need the water company’s approval first. A CCTV survey shows where the drain runs and its condition.
Do you empty grease traps at Walthamstow Market?
Yes, for food businesses on and around the market and the High Street.
Does my lower-ground flat have a pump?
If your drains are below the sewer in the street, it probably does. We can find it and check it.
Should I survey the drains before buying a terrace?
It’s worth it. Old clay drains often hide cracks or roots.
Can you come out today?
Our crews work in east London most days. Call 03333 233566 and we’ll tell you when we can be there.
Got a different question? Call 03333 233566 or send us a message.
Fully accredited & compliant
We're independently vetted and certified so you can trust who you're letting onto your site.
SafeContractor
Health & safety pre-qualification accreditation, verifying our processes meet recognised safety standards.
RISQS
Railway Industry Supplier Qualification Scheme — approved to work safely within the rail industry supply chain.
Achilles UVDB
Utilities Vetting Database membership, confirming we meet the utilities sector's supply chain standards.
Trading Standards Approved
Vetted and approved under the local authority's trusted trader scheme for honesty and fair dealing.
NADC Member
Members of the National Association of Drainage Contractors, the UK trade body for the drainage industry.
Registered Waste Carrier
Registered with the Environment Agency, so your waste is handled and disposed of fully within the law.