TL;DR
A blocked drain in Brighton or Hove usually announces itself with a gurgle, a bad smell, or more than one fixture draining slowly at once — the more fixtures involved, the further down the system the blockage usually sits. Clearing a single slow sink or gully is often manageable yourself; anything affecting multiple fixtures, or backing up outdoors as well as in, is a job for proper diagnosis rather than repeated attempts with a plunger. Once a drain leaves your property and joins the public network, Southern Water is the sewerage authority responsible for it — not the property owner. If you're not sure which side of that line your problem sits on, request a quote online and describe what's happening.
Reading the Symptoms: One Fixture or Several?
The number of fixtures affected is the single most useful clue when a drain starts playing up. A single slow sink or a smell from one plughole usually means a localised blockage close to that fixture's trap or waste pipe — a job most households can attempt themselves. When a bath, sink and toilet are all slow at once, or a downstairs toilet gurgles every time an upstairs bath empties, the blockage has moved beyond individual pipework into a shared branch or the main drain run, and it needs proper diagnosis rather than another go with a plunger.
An outside gully overflowing at the same time as indoor fixtures back up is a strong sign the blockage sits on the shared section between the house and the street — the part most likely to need jetting or a camera rather than a set of hand rods. If that's the pattern you're seeing, it's worth treating it as a blocked drain job from the outset rather than repeated attempts on a single fixture.
What's Actually Causing the Blockage
In Brighton and Hove's older housing stock — Regency terraces, converted flats and Victorian street layouts — a handful of causes show up again and again: fat and grease solidifying inside kitchen waste runs; root ingress into older glazed clay pipework, particularly on tree-lined streets; displaced or cracked joints in pipe that's been in the ground for well over a century; and, closer to the coast, fine silt and grit washed down from the chalk downland catchment above the town during heavy rain. Basement and lower-ground flats add another factor — waste pumped or macerated up to street level through a saniflo-type unit is more sensitive to downstream restrictions than gravity-fed drainage, so a partial blockage further along the run can show up as a struggling macerator before anything else.
Shared drainage is a genuinely local complication. Many Regency-era terraces and converted flats share one drain run serving several properties down to the boundary, which means a blockage that affects your flat may not originate in your flat at all — and clearing your own trap won't necessarily fix it. This pattern shows up right across the city, from the tightly packed streets of Kemptown and Hanover to the larger Victorian and Edwardian houses around Preston Park and Portslade.
Private Pipework vs Southern Water's Sewer
Responsibility for a blocked drain depends on exactly where along its length the blockage sits. The pipework inside a property boundary — from each fixture out to where it joins the shared or lateral drain — is generally the owner's responsibility. Once that drain connects to the public network, Southern Water, the sewerage authority for Brighton, Hove and the wider Sussex area, becomes responsible for it. For a shared drain serving several properties, the boundary can be less obvious, and it's not unusual for a blockage near that boundary to need confirmation of exactly where it sits before anyone can say whose job the repair is.
This is different from other parts of the country served by other water companies, so it's worth checking specifically for Southern Water's guidance rather than assuming national advice applies unchanged.
How Jetting and CCTV Diagnosis Work Together
For anything beyond a simple gully or trap clearance, the reliable approach is to see what's actually happening underground rather than guess. A CCTV drain survey sends a camera through the pipe to identify exactly what's causing the restriction — root ingress, a cracked joint, grease build-up, or a displaced section — and where it sits relative to the property boundary. High-pressure jetting then clears the blockage itself, using water pressure to break up and flush the debris rather than mechanical force that risks damaging older pipework. Used together, survey-then-jet avoids the trial-and-error of repeated rodding on a drain that keeps blocking.
FAQs
How do I know if a blockage is mine to fix or Southern Water's? It depends on where along the drain run the blockage sits relative to the boundary with the public sewer. A CCTV survey is the most reliable way to establish this rather than guessing from symptoms alone.
Why do several fixtures block at the same time? When more than one fixture is affected simultaneously, the blockage is usually in a shared branch or the main drain run rather than in an individual fixture's own pipework — the shared route means one restriction affects everything upstream of it.
Is jetting safe for old Brighton and Hove pipework? High-pressure jetting is generally gentler on older glazed clay and cast-iron pipework than repeated hard rodding, because it clears debris with water pressure rather than mechanical force, though a survey first helps confirm the pipe can take it.
Do basement flats block more often? Basement and lower-ground conversions, common across Brighton and Hove, can be more sensitive to drain restrictions because waste is often pumped or macerated rather than gravity-fed, so a partial blockage downstream shows up sooner than it would in a standard ground-floor property.
If a blocked drain is affecting more than one fixture, keeps coming back, or you're not sure whether it's your responsibility or Southern Water's, request a quote online and tell us what's happening. We cover blocked drains across Brighton and Hove, including shared and older drain runs.
