Most drain problems build slowly — a slightly slower plug hole, an occasional odd smell — until one day you're dealing with a full blockage or sewage backing up. The good news: your drains usually warn you first.

Sign 1: Slow-draining sinks, baths or showers

If water pools around your feet in the shower or sits in the sink for several minutes, your drain is partially blocked. Early stage — almost always a build-up of hair, grease, or soap residue a professional jet clears in minutes. If multiple fixtures drain slowly simultaneously, the blockage is further down the main drain and needs prompt attention.

Sign 2: Unpleasant smells from drains

A persistent foul or rotten-egg smell from a drain usually means organic matter has accumulated and is decomposing. It can also signal a damaged pipe allowing sewer gases into your home — which is a health concern, not just an unpleasant inconvenience.

Sign 3: Gurgling sounds from pipes or toilets

That gurgling or bubbling sound when you flush the toilet or empty the bath isn't just annoying — it's your drainage system telling you air is trapped. This happens when a downstream blockage forces air backwards through the system. Consistent gurgling means a developing blockage.

Sign 4: Water or sewage backing up

Dirty water coming up through a floor drain, into the bath when you flush, or pooling around an external inspection chamber is a significant blockage or structural issue. Call for an emergency callout immediately and don't use any water-based appliances until it's resolved.

Sign 5: Wet patches or unusually lush grass

A perpetually wet patch in your garden, grass growing notably greener in one spot, or soft ground that sinks slightly underfoot could indicate a cracked underground drain. Drainage water enriches soil — which is why broken drains often show as suspiciously healthy vegetation above. A CCTV survey will confirm this.

A CCTV drain survey is a straightforward inspection where a small waterproof camera is fed through your drainage system, recording exactly what it finds. The process usually takes less than an hour and costs a fraction of any excavation — but it gives you a clear, evidence-based picture of what's needed, and what isn't.

What happens during a CCTV survey?

The engineer locates the nearest inspection chamber, feeds a flexible camera rod through the drain, and records live footage as it travels through the system. You receive a written report with findings, depth and location of any defects, recommended actions, and a copy of the footage.

What can a CCTV survey find?

Root ingress. Tree roots enter through cracked joints and grow inside the pipe, eventually causing blockages or collapse. Very common in older properties across Teesside where mature trees are everywhere.

Cracked or displaced joints. Pipes shift over time — especially in clay-heavy soils. Open joints allow groundwater in and sewage out.

Collapsed sections. Often the cause of persistent unexplained blockages. The only way to find a collapse is a camera.

Illegal connections — important to identify before buying a property.

How it saves you money

Without a CCTV survey, a drainage engineer has to guess where a problem is. Sometimes that means digging up a driveway — at £500 to £2,000 or more — only to find the problem is further along. A survey costing £150–£250 prevents that entirely.

Pre-purchase surveys are one of the most overlooked steps in buying a home. Drainage defects don't appear in a standard homebuyer survey, but they can cost thousands to fix. A survey gives you evidence to negotiate the purchase price — or walk away.

Ask any facilities manager about their most disruptive maintenance problems and drainage will be near the top. A blocked drain during a restaurant Friday evening service, during a care home inspection, or on a Monday morning in a busy office — it costs far more than the drainage bill. It costs reputation, productivity, and sometimes regulatory compliance.

Reactive vs planned — the real numbers

The mathematics are clear. A typical commercial drainage emergency costs £800–£3,000 or more when you factor in out-of-hours callout rates, business disruption, and any health and safety clean-up. A planned annual maintenance contract typically costs £300–£800 per year for a typical commercial property.

Most commercial properties experience at least one significant drainage issue every 2–3 years if drainage is left to chance. A single emergency event typically costs more than three or four years of planned maintenance.

What an annual maintenance contract includes

NorthFlow's commercial contracts include: annual CCTV survey with written report and video, scheduled high-pressure jetting, inspection of all accessible chambers and gullies, priority emergency response, full written service records, and a fixed annual price — no surprise invoices.

Compliance and documentation

For care homes, food businesses, and schools, maintaining drainage records isn't just good practice — it can be a regulatory requirement. Our written service records provide documented evidence for CQC inspections, food hygiene audits, and insurance claims.

Kitchen sinks: fat, oil and grease

Cooking fat poured down the sink might look liquid when it goes down, but it solidifies as it cools further along the pipe — gradually coating the inside walls and narrowing the bore until it blocks entirely. This is the single most common cause of domestic kitchen drain blockages in the UK. Pour cooled fat into a container and bin it, not the sink.

Bathroom drains: hair and soap scum

Hair is the primary cause of bath and shower drain blockages. It binds with soap residue, forms a net-like structure that catches more debris, and builds into a dense plug over time. A drain guard from any hardware shop costs less than £3 and prevents the problem entirely. Clean it weekly.

Toilets: "flushable" wipes and foreign objects

Despite what packaging says, wet wipes do not break down in drainage systems. They cause blockages 10–20 metres from the toilet, deep in underground pipes where they're expensive to clear. The rule is simple: only toilet paper goes down the toilet.

Seasonal maintenance tips

Autumn: Check and clear external drain covers after heavy leaf fall. A blocked gully causes flooding on your driveway in the first heavy rain of autumn.

Winter: Run hot water down kitchen sinks regularly during cold periods to prevent grease solidifying faster in the cold.

Spring: Tree roots grow fastest in spring. If you've had a recurring slow drain, spring is a good time to book a CCTV survey before it becomes a summer emergency.

What a standard survey misses

A Level 2 or Level 3 homebuyer survey from a RICS surveyor assesses visible structure thoroughly. But drainage runs underground, behind walls, and under driveways. Unless there's active sewage backing up on the day of the inspection — which there never is — no standard survey will flag drainage problems.

This means you can exchange contracts on a property with a partially collapsed drain, significant root ingress, a cracked pipe leaking into the foundations, or illegal connections — and know nothing about it until you're the legal owner.

What we find on pre-purchase surveys

Root ingress. Very common in Teesside where older housing is surrounded by mature trees. Roots enter through cracked joints and grow inside pipes. Left untreated, they cause complete blockage or pipe collapse.

Displaced joints and cracked sections. Pipes shift over time, particularly in clay-heavy soil. Open joints allow groundwater in and drainage water out — which can affect foundations.

Collapsed sections. Often completely unknown to the vendor. Our cameras find them; nothing else does.

What the survey costs vs what it can save

A pre-purchase drain survey with NorthFlow typically costs £150–£250 for a domestic property. Drainage defects can cost hundreds to thousands to fix. In a negotiation, documented evidence of a defect is almost always worth significantly more than the repair cost.