Blocked Drains in Southampton: Who Pays & Your FAQs
Blocked drains in Southampton have a habit of showing up at the worst possible moment: a gurgling toilet on a Sunday night, water rising in the downstairs shower, or a smell coming off the inspection chamber by the back door. Most of the calls we take from Shirley, Bitterne, Portswood and out towards Eastleigh start with the same two questions. Who's responsible for this, and how much is it going to cost?
Below are straight answers to those, plus the other things people ask us before they book, based on the drainage work we carry out across Southampton and the rest of the south coast.
Who is responsible for a blocked drain in Southampton?
It depends on where the blockage actually is, which isn't always where the symptoms appear. On 1 October 2011, most private sewers and lateral drains in England were transferred to the water companies, and in Southampton that's Southern Water. As a rough guide:
The drain that serves only your property and sits inside your boundary is yours to maintain and clear.
A pipe shared with a neighbour, or one that runs under someone else's land, is usually treated as a public sewer and is Southern Water's responsibility.
The lateral drain running from your boundary out to the main sewer in the road is also Southern Water's, even if it only serves your house.
The catch is that you can't tell which section is blocked just by lifting a cover and peering in. We regularly find the problem is on the private side, a few metres from the house, in a pipe the owner assumed belonged to the water company. If we find it's on the public side, we'll tell you straight away so you can report it to Southern Water at no cost. There's no sense paying us to clear something that isn't yours.
For rentals, the landlord is normally responsible for the drains unless the tenant caused the blockage (a pack of wet wipes is the usual suspect). We look after plenty of rented houses around Portswood and Highfield, and a few minutes of camera footage tends to settle that conversation quickly.
How much does it cost to unblock a drain in Southampton?
These are typical 2026 prices for our drainage visits on the south coast, including VAT. Treat them as guides rather than quotes, because access, depth and the cause of the blockage all move the number.
Straightforward unblock with rods or a small jetter: around £120 to £300
High-pressure jetting of a longer run or a heavily silted drain: roughly £150 to £300
CCTV drain survey with footage and a written report: around £240 to £420
If the camera shows a cracked or collapsed pipe, the cost conversation changes. A lot of those can be repaired from inside the pipe without digging up the drive, which we explain in our guide to no-dig drain relining. Excavation is the last resort, and we only price it once we've seen the footage.
How quickly can you get out to me?
We treat an active blockage, where waste is backing up or a toilet won't flush, as urgent and book it in ahead of routine work across Southampton, Eastleigh, Totton and Chandler's Ford. A slow-draining sink or an occasional smell can usually wait for a planned visit later in the week.
While you're waiting, stop putting water into the system. Every flush, shower and washing machine cycle adds to what's already backed up. If it's overflowing from an outside gully, that's annoying, but it's a far better place for it to escape than your shower tray.
Will jetting damage old pipes, and do I need a CCTV survey?
Done properly, jetting won't harm a sound pipe. Plenty of the 1930s semis around Shirley and Freemantle still have their original clay drains, and some of the Victorian terraces nearer the city centre are older again. On runs like that we'll often put the camera down first and set the jetting pressure to suit what we see. If a pipe is already cracked, jetting won't make it meaningfully worse, but it won't fix it either, and you'll be ringing us again in six months.
That's really the test for a survey. If the same drain has blocked more than once in 12 months, something structural is almost always going on: a dip where waste settles, a displaced joint, or roots coming through. A survey shows exactly where and how bad it is, so you pay to fix the cause instead of clearing the symptom over and over. It's also well worth doing before you buy an older house or build an extension over existing drains.
What causes most blocked drains in Southampton?
Across the jobs we attend, it's nearly always one of these:
Wet wipes and sanitary products, including the ones labelled flushable
Cooking fat and oil poured down the kitchen sink, which sets hard further down the pipe
Tree roots working into old clay joints, especially on tree-lined roads near the Common
Leaves and silt washed into yard gullies, which is why October and November keep us busy
That last one is worth ten minutes this month. Our autumn drain and gutter checklist covers what to clear before the winter rain sets in, and it applies just as much in Southampton as it does in the New Forest.
Related reading
Got a blocked drain in Southampton?
Whether you're in Woolston, Hedge End or right in the city centre, send us a few details and a photo of the problem. We'll tell you honestly whether it looks like your drain or Southern Water's, give you a price before we start, and bring the camera if it's a repeat offender. Book a drain visit with Complete Builds and we'll be back in touch to arrange a time.
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