CLEARMASTERS
Drain clearance on large plots
Long private drains and mature gardens make blockages harder to find. We locate them with a camera, clear them and tell you what caused them.
Learn moreStanmore sits at the very top of north-west London, at the end of the Jubilee line, where the suburbs meet the green belt. Many homes are large detached houses on big plots, often extended with basements, pools and annexes, and some on the edges of Stanmore Common, Little Stanmore and towards Elstree and Bushey Heath are not on the mains sewer at all.
That makes Stanmore unusual for a London area. Alongside clearing and surveying drains, we service basement pumps and empty septic tanks, cesspits and treatment plants for homes on the edge of the countryside. The ground is London Clay, which drains slowly and cracks old pipes.
Our crews work in north-west London most days and we answer the phone 24 hours a day, 365 days a year.
Our Stanmore drainage services
View all services
Blocked Drains & CCTV Surveys
Learn more
Pump Station Servicing
Learn more
Septic Tank & Cesspit Emptying
Learn more
Treatment Plant Servicing
Learn more
Septic Tank Surveys
Learn more
Treatment Plant & Pump Repairs
Learn moreCovering
Stanmore
Stanmore
24/7
call-outs
call-outs
Homes &
businesses
businesses
Waste transfer
notes
notes
Own tanker
fleet
fleet
What we do for Stanmore customers
Basement, pool and annexe pumps
Basements, pool plant rooms and annexes below the sewer rely on pumps. We service them, test floats and alarms and respond 24/7 when one fails.
Learn more
Septic tanks and cesspits on the green belt
Some homes on the edge of Stanmore and towards Elstree are off the mains. We empty septic tanks and cesspits and check them every visit.
Learn more
Treatment plant servicing
If you have a treatment plant, it needs servicing at least once a year. Our engineers service the common makes and leave a written report.
Learn moreLocal knowledge
Drainage in Stanmore: what to know
Where London meets the green belt.
Not always on the mains
Some homes on the edges of Stanmore have septic tanks, cesspits or treatment plants rather than a sewer connection.
Clay and drainage fields
London Clay drains slowly, so drainage fields can struggle in winter.
Big homes, long drains
On large plots, the drain from house to sewer can be long and entirely yours.
Local to you
Areas we cover in and around Stanmore
We cover Stanmore and the neighbouring parts of north-west London and Hertfordshire.
Stanmore · and neighbourhoods
- Stanmore
- Canons Park
- Little Stanmore
- Edgware
- Stanmore Common
- Queensbury
Surrounding areas · including homes on septic tanks
- Elstree
- Bushey Heath
- Harrow Weald
- Mill Hill
- Hatch End
- Burnt Oak
- Kingsbury
- Belmont
- Borehamwood
- Aldenham
- Brockley Hill
- Harrow
Not sure if we cover you?
If you’re in or around Stanmore, we cover you. Call with your postcode and we’ll confirm.
Nearby areas
Why Stanmore customers use us
Mains, pumps and private drainage
Whether it’s a basement pump in Canons Park or a cesspit on the green belt, here’s what you can expect.
-
One call for everything
Tanks, treatment plants, pump stations, grease traps and drains, all handled by one team.
-
Trained engineers
Our engineers and most of our tanker drivers hold current confined space entry certificates, and the engineers carry the most common parts.
-
34 years in drainage
We’ve been emptying tanks and servicing systems since long before most of the kit on the market existed.
-
Paperwork done properly
A waste transfer note with every collection, and a written report after surveys and services.
-
Day and night, all year
Emergency call-outs 24 hours a day, 365 days a year, with a real person answering the phone.
-
We remember so you don’t have to
Regular customers get a reminder when their next empty or service is due.
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
★★★★★I have used this business for several years now and they have consistently provided outstanding service.. Every member of staff has been friendly, competent and professional. Very impressive.
Antony A. Google review
★★★★★Came out within an hour on an emergency call out. Great service. Fast reliable reasonable prices. Highly Recommended
★★★★★Our family have been using Clearmasters for years and are the only choice as far as we are concerned! All the staff are friendly, helpful and accommodating. Couldn’t recommend them highly enough!
How it works
What happens when you book
The same simple process for every job.
-
Step 1
Tell us what you’ve got
Call us or book online and tell us what system you have. If you’re not sure whether you’re on the mains, we’ll help you find out.
-
Step 2
We come out and do the job
We send the right engineer, van or tanker. It helps if:
- there’s room to park a tanker close to the tank, trap or manhole
- lids, covers and hatches are clear and easy to find
- you tell us about narrow access, gates or site rules before we arrive
-
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 Stanmore 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, pumps and tanks
- Septic tanks and treatment plants on London’s edge
- Basement pump servicing
Urgent?
03333 233566
Questions answered
Stanmore drainage FAQs
What homeowners in and around Stanmore ask us most.
Are there homes in Stanmore not on the mains sewer?
Yes. Some homes on the green-belt edge have septic tanks, cesspits or treatment plants. If you’re not sure, we can help you find out.
How often should a cesspit be emptied?
It depends on its size and water use, often every few weeks or months. We can book regular collections.
Do you service pool plant room pumps?
Yes. If waste or water from a pool plant room, basement or annexe is pumped to the drain, we can service the pump and chamber.
Why does my drainage field struggle?
London Clay drains slowly, so drainage fields can be saturated in winter.
How often should a treatment plant be serviced?
At least once a year.
Are you available out of hours?
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.
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.