Drain Survey Cost Calculator

How much does a drain survey cost in the UK?

A drain survey cost in the UK is typically £150 to £350 for a standard home, rising to £400–£700 for a full survey with a drainage plan and £600–£1,200 for commercial premises. The calculator above applies the survey type, property size, region and any extras to give you a realistic figure before you ring round for quotes. Price is driven by four things: how long the engineer is on site, whether a written report is produced, how hard the drains are to reach, and where you live – London and the South East carry a 20–35% premium over the rest of the country.

What you get for the money

A CCTV drain survey pushes a camera on a flexible rod through the drain runs from an access chamber, recording the condition of every pipe. The engineer is looking for cracks, root ingress, displaced joints, collapsed sections, blockages, misconnections and evidence of rats. A basic survey is a camera run and a verbal summary. A pre-purchase (homebuyer) drain survey adds a written report with still images, a condition grade for each run and a repair recommendation – that report is what a mortgage lender or insurer will actually accept. A full survey adds a drainage plan showing where every pipe runs and which are your responsibility versus the water company's.

What changes the price

• Survey type. Fault-finding is the cheapest because no formal report is produced. A homebuyer survey with a written, gradeable report costs roughly 40–50% more.
• Property size. More bathrooms and a longer run of pipe means more camera time. A five-bedroom detached house typically costs about 30% more than a three-bed semi.
• Access. If there is no accessible manhole, the engineer may need to lift a cover, use a rooftop vent or dig to reach the run. Expect £50–£100 extra.
• Urgency. Same-day and emergency call-outs typically add £100–£150.
• Region. London is the most expensive; Scotland, Wales and Northern Ireland are usually slightly cheaper than the English average.

Is a pre-purchase drain survey worth it?

For a house purchase the arithmetic is one-sided. A homebuyer drain survey costs a few hundred pounds. A collapsed drain under a Victorian terrace, or a section of pipe destroyed by tree roots, routinely costs £3,000 to £10,000 to excavate and replace – and a standard RICS Level 2 HomeBuyer Report does not cover drains, because the surveyor cannot see inside them. If the survey finds a defect, you have a documented basis to renegotiate the price or ask the seller to fix it before exchange. If it finds nothing, you have paid for certainty on the one part of the property nobody else has looked at.

Who is responsible for the drain that fails?

This matters, because it decides who pays for the repair. Since the 2011 private sewer transfer in England and Wales, the lateral drain – the section of pipe that runs beyond your property boundary and joins the public sewer – and any shared drain serving more than one property are the responsibility of your water company. The pipework within your boundary that serves only your house is yours. A good drainage plan shows exactly where that line falls, which is why the full survey option is worth the extra if you suspect a problem near the boundary. If the fault turns out to be on the water company's side, they repair it at no cost to you.

Worked example

A buyer is purchasing a 4-bedroom house in the South East and wants a pre-purchase drain survey with a report their lender will accept. The base rate for a homebuyer survey is £275. The four-bedroom adjustment multiplies that by 1.15 to £316, and the South East regional adjustment multiplies it by 1.20 to £380. Adding a formal lender report (£45) brings the total to £425, and most quotes would land between £361 and £510. If the drainage firm is VAT registered, add roughly £85 on top.

How to keep the cost down

Book the survey at the same time as any other drainage work – the call-out is a large part of the bill and firms will often waive it. Ask specifically whether the price includes a written report with still images; a cheap quote that produces only a verbal summary is useless to a lender. Get quotes from independent drainage engineers rather than through your conveyancer, who may add a referral fee. Finally, check whether your buildings insurance or home emergency cover already includes a drain inspection after a blockage – many policies do.

Frequently asked questions

How much does a CCTV drain survey cost?

A standard CCTV drain survey in the UK costs about £150 to £250 for a typical three-bedroom home. A pre-purchase survey with a written report is usually £200 to £350, and a full survey with a drainage plan is £300 to £500. London and the South East add roughly 20% to 35%.

How long does a drain survey take?

Most residential drain surveys take one to two hours on site. A written report normally follows within 24 to 72 hours. Larger or commercial sites can take half a day or more.

Is a drain survey included in a house survey?

No. A standard RICS HomeBuyer (Level 2) or Building Survey (Level 3) does not inspect inside the drains, because the surveyor cannot see into the pipework. A drain survey is a separate instruction and a separate cost.

Who pays to repair a broken drain?

Since the 2011 private sewer transfer in England and Wales, lateral drains beyond your boundary and shared drains serving more than one property are the water company's responsibility. Pipework inside your boundary serving only your home is yours to repair.

Is a drain survey worth it before buying a house?

For most buyers, yes. The survey costs a few hundred pounds, while excavating and replacing a collapsed drain typically costs £3,000 to £10,000. A defect found before exchange is a documented basis to renegotiate the price.

Source: drain and sewer responsibility rules from GOV.UK – Blocked drains and sewers, following the 2011 private sewer transfer in England and Wales. VAT registration threshold (£90,000) from GOV.UK – VAT registration. Price ranges reflect 2026 UK drainage-contractor market rates.