A CCTV drain survey is not always necessary. A first-time blocked sink or a one-off gully blockage usually needs only a clear-out. However, guessing at the cause of a bigger problem often costs more than a quick look inside the pipe.

This guide sets out when a survey is clearly the right first step, because the choice affects both cost and outcome. If you want the basics, read about the CCTV drain survey and what a CCTV drain survey is.

When a Survey Is the Right First Step

Recurring Blockages

If the same drain has blocked more than once in a year, the cause is probably structural, since a simple blockage rarely returns. A slipped joint makes a ledge where debris catches. A hairline crack lets roots in, and they regrow soon after each clear-out.

Clearing a damaged drain again and again is an endless chore, because the fault stays put. A survey finds the defect, so a targeted repair can fix it for good. For one repair option, read why we use drain relining and how drain lining improves your drain. If your drain keeps clogging, see why a main drain keeps clogging.

Before You Buy a Property

Drain faults can be an expensive surprise after a purchase. A standard building survey does not look underground. As a result, a collapsed clay run or a root-filled pipe stays hidden. A survey before exchange shows what lies under the ground.

If the survey finds faults, you have choices, although each has a cost. You can ask for a lower price, ask the seller to repair the fault, or walk away. Without a survey, you inherit whatever is down there.

A survey is especially worthwhile for:

Victorian or Edwardian homes with original clay drains
Properties with large trees in or near the garden
Homes with a history of subsidence or settlement
Any sale where the seller has no drain records

Unexplained Damp, Sinkholes or Settlement

A leaking drain can cause damp, sinking ground and holes in lawns or drives. The leak need not be large, because a small, steady flow can wash away soil over time. If a surveyor cannot explain ground movement, a drain survey is a logical next step.

The survey either confirms a leak or rules it out. Either way, because it ends the guessing, it points the next investigation in the right direction.

After Ground Disturbance

Digging near a drain can move or crack the pipe, because the ground around it shifts. Tree planting, tree removal, road works and extensions are all examples. Neighbouring building work can have the same effect.

A survey after the disturbance shows whether the pipe still sits straight and whole. Since damage often shows up months later, an early check is wise.

Before a Major Repair

If a contractor proposes a dig, a full liner or a section replacement, ask for a survey first, since the camera shows the true scope. Without one, the price rests on symptoms alone, so the final bill can grow. A survey sets out the scope and records the pipe before work starts, so both sides have the same facts.

What a Survey Needs From You

A survey usually needs no digging and little disruption, because the camera uses existing access. The camera goes in through a manhole or inspection chamber outside the building. You normally receive a report after the visit. For what drives the price, see what changes the cost of a CCTV drain survey.

When a Survey Is Not Needed

Not every drain problem needs a camera. For example, a first-time blocked kitchen sink is almost always grease and hair, so a clear-out solves it. A gully that floods after leaf fall needs clearing, not inspecting.

Use this rule, since it is simple. If a drain has blocked before, or if you see signs of a structural fault, a survey is worth it. If it is a first blockage with clear causes, start with a clear-out, as described in what a drain unblocker service does.

Want to know more about who does this work? While a plumber covers indoor pipes, see what a drain specialist does. For upkeep, read why drain maintenance matters.

Surveys in North London

While we cover the whole area, we offer our CCTV drain survey service and our blocked drains service. For local help, see drain unblocking in Enfield, blocked drains in Barnet and drain help in Edgware. To ask about a survey, send the online enquiry form.