Drain Unblocking
Available 24/7. We clear blocked drains, sinks, toilets and gullies on the first visit in the vast majority of cases.
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Blocked Soil Stack Pipe Unblocking London
24/7 Soil Stack Unblocking Services in London & Hertfordshire
24/7 emergency service for blocked soil stack pipes in London & Herts. We expertly clear internal & external stacks, fixing multiple blocked toilets & sinks.
A blocked soil stack is a serious emergency, disabling multiple bathrooms and kitchens at once. Get a rapid, fixed-price solution from our expert engineers. We use specialist equipment to clear blockages in main stack pipes for homes and businesses across London and Hertfordshire, restoring full flow and hygiene to your property. No call-out fees, no hidden costs.
Your Local 24/7 Engineers in London & Hertfordshire
When your property's main waste pipe is blocked, you need fast, local help. We have dedicated engineers serving: All London Boroughs (including North, South, East & West London) and Hertfordshire (including Watford, St Albans, Hemel Hempstead, Stevenage, and surrounding areas).
What Is a Soil Stack Pipe?
The soil stack, or soil vent pipe (SVP), is one of the most important pipes in your property.
It's the large-diameter vertical pipe that runs from above your roofline down to the underground drains.
Its job is to safely carry all wastewater and solids from your toilets, sinks, showers, and baths away from your home, while also allowing foul air to be ventilated out above the roof.
When this single pipe gets blocked, the entire property's drainage is compromised.
What to Expect from Our Stack Unblocking Service
Call Us 24/7: Explain the problem, and we'll dispatch an emergency engineer.
Get a Fixed Price: We provide a clear, fixed price to unblock the stack before work begins.
Expert Diagnosis & Unblocking: Our engineer will identify the best access point and use the most effective equipment (EMC or jetting) to clear the pipe.
System Fully Tested: We don't just leave. We test multiple fixtures (toilets, sinks) throughout your property to confirm that flow is fully restored before we go.
Call Now For Your Blocked Stack Emergency.
Available 24/7, Fixed Price & No Callout Charge.
Testimonial
Drain 247 mapping saved our project from delays. Clear plans, fast service!”
— John S, Architect, London
Frequently Asked Questions
This is the classic symptom of a blocked main stack pipe. Because both fixtures feed into this single vertical pipe, a blockage in it will affect everything connected, especially on lower floors.
Flushing non-flushable items is the primary cause. Wet wipes, sanitary products, nappies, and even kitchen roll do not break down and will snag inside the pipe, causing a major build-up.
No. Our engineers are experts at working inside properties. We use methods like electro-mechanical cleaning which are self-contained and take all necessary precautions to ensure the work area is kept clean and tidy.
The best prevention is to only flush the three P’s: pee, poo, and (toilet) paper. Be careful to scrape plates and avoid washing fat, oil, or grease down the kitchen sink. Using drain catchers in showers and sinks also helps.
This depends on where the blockage is located. Our engineer will assess the situation and find the best, least disruptive access point, which could be an external inspection chamber or an internal access point. We will always explain the process to you first.
Why It Is Worth Doing Properly
Call Our Experts Immediately If You Notice
Multiple Blocked Fixtures: The most common sign.
Gurgling Drains
When you flush the toilet, you hear gurgling sounds from the shower or sink plughole as trapped air tries to escape.
Rising Water Levels
Flushing an upstairs toilet causes the water level in a downstairs toilet to rise.
Foul Odours
Unpleasant drain smells appearing in your bathrooms or kitchen, indicating trapped waste is decaying in the pipework.
Wastewater Backup
The worst-case scenario, where waste from an upper floor backs up into a ground-floor shower, bath, or toilet.
Electro-Mechanical Cleaning (EMC)
For internal blockages, we often use high-speed, flexible cables with rotating cutting heads. This equipment is fed into the pipework to grind away scale, cut through wet wipe masses, and clear the blockage without the need for high-pressure water inside your home.
If This Sounds Like Your Problem
You do not need to diagnose it perfectly. Describe the symptom and we will tell you the likely cause and what it will cost to put right.
What Our Customers Say
Brilliant service, they helped unblock my drain really quickly. Would definitely recommend!
An absolute pleasure to deal with. George arrived at my house quickly to take care of a blockage in my drain. He cleared it in less than an hour and was very knowledgeable.
I really needed someone to come and unblock my outside drain as it was causing flooding issues. I found these guys online and they came the same day. Very impressed.
Drainage Services We Provide Nearby
CCTV Drain Survey
High-resolution inspections that identify structural problems, repeated blockages and hidden defects — with a report you can act on.
Find out moreDrain Repair
Patch lining, full relining and excavation repairs for cracked, collapsed or deteriorated pipework.
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Drain Mapping
Accurate mapping of underground drainage for planning applications, extensions and compliance checks.
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Drain Jetting
High-pressure water jetting that scours fat, silt and scale from the pipe wall.
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Tanker Services
Vacuum tanker deployment for emptying, interceptors, and jobs too large for a van-mounted unit.
Find out moreAreas We Cover
Same-day drainage work across Hertfordshire and north west London.
Ready to Get This Sorted?
Call for a fixed price, or leave your details and we will call you back. The phone is answered 24 hours a day.
Download the Drain 247 Brochure
The 2026 company brochure: the services, the area we cover, and how a visit works. Handy to send on to an architect, a builder or a buyer.