Blocked drain cost UK: what you should expect to pay

Blocked drain cost is the question almost everyone asks before they call anyone out, and the honest answer is that the price depends far more on how the job is priced than on how bad the blockage is. Across the UK in 2026, a straightforward domestic blocked drain cleared on a single visit typically lands somewhere between £120 and £400. The wide range isn't because the work varies that much — it's because some firms charge a flat fee that covers the visit and the work, and others quote a low headline call-out and then bill by the hour, per metre of jetting, or per item of equipment used.

The number that matters is not the call-out fee. It's the total you will pay when the engineer drives away. Before you agree to anything on the phone, ask one direct question: what is the maximum I will pay if this takes an hour? A firm that can answer that clearly is a firm you can budget for. A firm that says it depends is telling you the final figure is being decided after they arrive.

A properly structured call-out fee should cover the engineer attending, diagnosing the problem and doing the actual work for the period it covers — not just the act of turning up. In our case the fixed call-out fee covers the first hour on site, and that hour includes diagnosis, rodding or jetting where it's suitable, and a camera check if the blockage suggests something structural underneath. Anything beyond that first hour is quoted and agreed before we carry on.

Where people get caught out is a call-out fee that buys nothing but attendance. You pay £60 for the engineer to arrive, then the meter starts: labour by the hour, a separate charge for bringing the jetter off the van, a separate charge for the camera, and a mileage line at the bottom. The headline was the cheapest quote you got; the invoice isn't.

As a rough guide for 2026: clearing a simple blocked sink, toilet or external gully usually falls in the £120–£250 band. High-pressure jetting of a longer run, or a blockage caused by fat, roots or silt build-up, tends to sit at £180–£400 depending on how long it takes. A CCTV drain survey with a written report and footage is typically £200–£450 for a domestic property, and more where the run is long or access is difficult. A homebuyer's pre-purchase survey sits at the lower end of that.

Repairs are a different category. A localised patch liner on a single cracked joint is commonly £400–£900. Relining a full length of pipe with a cured-in-place liner is usually £1,200–£3,000 depending on length and diameter. Excavating and replacing a collapsed section is the expensive option — £2,000 upwards, and considerably more if it runs under a driveway, an extension or a road. That gap is exactly why a survey before a repair is worth paying for: it's what tells you whether the cheap no-dig option is actually available.

Most drainage firms charge more at night, at weekends and on bank holidays, and that's reasonable — someone is getting out of bed. What isn't reasonable is finding out about the uplift on the invoice. Ask what the out-of-hours rate is when you call, not afterwards.

It's also worth being honest with yourself about whether the job is genuinely an emergency. Sewage backing up into a property, a drain surcharging into a garden, or a commercial kitchen that can't trade are all emergencies. A slow-draining shower at 11pm is not — it will cost you less on a weekday morning and it will not get worse overnight.

Before you pay for anything, it's worth establishing whose drain it is. Since the 2011 private sewer transfer in England and Wales, most shared drains and lateral connections beyond your property boundary belong to the regional sewerage undertaker — Anglian Water, Severn Trent, Thames Water and so on. If the blockage sits on their side, clearing it is free to you.

The practical obstacle is proof. A water company won't attend on a description. What gets an issue accepted is a CCTV survey with footage and an accurate location, and any competent drainage firm should be willing to tell you when a fault sits on the public side rather than quietly charging you for it. Paying £250 for a survey that saves a £2,000 repair bill is the best money in drainage.

Four things protect you. First, get the total, not the call-out fee. Second, insist that any work beyond the agreed period is quoted and approved before it starts. Third, ask for camera footage of anything you're told needs repairing — no reputable firm will refuse, and 'we had a look and it needs digging up' with no evidence is the oldest trick in the trade. Fourth, be wary of an engineer who recommends excavation before a survey has been done; no-dig repair is available far more often than it's offered.

The other quiet cost is repeat visits. A drain that gets cleared three times in a year is not a blockage problem, it's a defect problem, and paying three call-out fees to avoid one survey is the most expensive route available. If you've had the same drain cleared more than once, put the money into finding out why.