How do I choose a drainage company?

Drainage work ranges from a quick clearance to a major repair, and quality and pricing vary widely. A few sensible checks separate a fair, competent firm from one that overcharges or upsells. Here is what to look for.

Accreditation, insurance and reviews

Start with credentials. Reputable drainage firms are often members of a recognised trade body and carry public liability insurance, which matters if work goes wrong or damages property. Verified listings on established platforms such as Checkatrade or Trustpilot add a layer of vetting and let you read independent feedback. Treat reviews on a company's own site with more caution than third-party reviews you cannot edit, and look for a pattern over many jobs rather than a handful of glowing comments.

Ask directly whether the firm is insured, how long it has traded, and whether the technician who attends is experienced with your type of problem. A company confident in its work will answer these without hesitation and will not be offended by the questions. Local firms with a steady track record of nearby reviews are often a safer bet than an anonymous national number that subcontracts the job.

Indicative checklist for guidance. Always confirm details in writing.

Pricing and avoiding the overcharge

Clear pricing is the single best protection. Ask for a written quote where possible, or at minimum a stated call-out fee and hourly rate, with confirmation of what is included — does the price cover the clearance, or only the visit, with extra for jetting or a survey? Get this before work starts. Drainage is an area where some firms quote low to attend, then escalate the bill on site, so a figure agreed upfront and confirmed in writing limits surprises.

Be cautious of pressure tactics: a technician who, on arrival, insists on expensive excavation or relining without first running a camera to show the problem is upselling. Genuine repairs are justified by evidence, usually a CCTV survey. Comparing two or three quotes for any substantial repair is reasonable, and a trustworthy firm will not object to you doing so. If a price seems far below the others, ask what corners are being cut; if far above, ask what justifies it.

Diagnosis, reporting and the recurring problem

For a one-off blockage, clearance is enough. But for a drain that keeps blocking, or any suspected damage, the right firm diagnoses before it repairs. A CCTV survey shows what and where the problem is, and a good company shares the footage and a written report rather than asking you to take its word for the diagnosis. That report is also valuable evidence for insurance claims, for confirming responsibility on a shared run, and for getting comparable quotes on any repair.

Beware the firm that clears a recurring blockage cheaply every few weeks without ever investigating why it returns — that is more profitable for them than fixing the cause. Equally, beware the firm that jumps straight to excavation without a survey. The honest sequence is clear the immediate blockage, survey if it recurs or damage is suspected, then recommend a repair matched to the evidence, with no-dig relining considered before excavation where the pipe allows. A company that works this way, gives written quotes and reports, holds insurance, and has solid independent reviews is the kind worth hiring.

Questions to ask and guarantees to expect

A short list of questions on the phone or on arrival quickly separates a professional outfit from a chancer. Ask whether the quote is fixed or hourly and what it includes; whether there is a call-out charge and whether it is credited against the work; whether the technician attending is directly employed or a subcontractor; and whether the firm carries public liability insurance. For any substantial repair, ask whether a CCTV survey will be carried out first and whether you will receive the footage and a written report. Clear, confident answers are a good sign; evasiveness or pressure to commit on the spot is not.

For repair work, ask about guarantees. Reputable drainage repairs such as relining often come with a workmanship or product guarantee, and it is reasonable to ask how long it lasts and what it covers before agreeing. Get the guarantee, like the quote, in writing. Be wary of any firm that wants full payment in cash upfront, that cannot provide a written quote, or that has no traceable business address or reviews — these are the patterns associated with overcharging and poor work, particularly with so-called emergency outfits that appear at the top of a hurried online search.

Finally, do not let urgency override judgement. A genuine emergency — sewage backing up into the home — does need prompt action, but even then a quick check of who is responsible and a clear price agreed before work starts is worth the few minutes it takes. For anything that is unpleasant but not an emergency, taking the time to get two or three quotes and to check reviews almost always produces a better outcome than calling the first number that appears. The combination of accreditation, transparent pricing, evidence-based diagnosis, written reports and guarantees, and independent reviews is what marks out a drainage company worth trusting.

Frequently asked questions

Sources & further reading

• Checkatrade — finding and hiring a drainage specialist
• Water UK — who is responsible for drains and sewers

Figures on this page are typical UK ranges drawn from published cost guides and are intended as guidance, not a quotation.