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What is a Build Over Drain Survey?

Building over an existing drain or sewer poses the risk of damage being caused to pre-existing pipework, causing mass disruption. Build over or Pre Build CCTV surveys are conducted both before and after building work is completed to eliminate this risk. When planning an extension on an existing property, note that the local water authority will insist a CCTV drainage survey is conducted if any of the building work is due to take place over or near their pipes.

Do You Need a Build Over Drain Survey?

When considering building a conservatory, garage or any other extension, the local water authority will need to know about what you are planning. Since October 2011, legislation has been in place to ensure that their access to drains is not impeded and that work being completed will not affect their drainage infrastructure.

A build over CCTV survey will help the property owner to comply with the local authority requirements and establish the location, condition, depth and size of all drainage.

Many sewage systems are located near private property, so when extending your home, the build over CCTV survey will establish if the development work will infringe on a public sewer network.


The Drain Doctor Pre-Build CCTV Survey

If you are thinking of adding an extension, conservatory or garage to a property, the Drain Doctor build over / pre-build CCTV service will ensure the project proceeds with confidence and that the building work is undertaken in the knowledge that no drain or sewage pipe issues will arise. Our state of the art cameras are used to map out the drainage system and ensure that any new drains implemented meet industry standards.

Pre-Build Drain Survey Service:

  • Comprehensive Build Over Drain Surveys
  • Detailed Reports Delivered
  • Prevent Damage or Disruption to existing drains
  • Check New Drains Meet Industry Standards
  • Cost-Effective
  • Minimal Disruption with No Digging Required
  • Insight into the Best Way to Resolve Any Issues

Property owners and contractors utilise pre-build CCTV drainage for various reasons. Our CCTV drainage equipment helps improve decision making ahead of a build, delivering valuable insight into the location of the entire sewage and drainage infrastructure that might come into play ahead of construction work.


Pre-Conditional CCTV Survey

Pre-build surveys from Drain Doctor are used to identify the current drainage system at any property. If considering an extension, our experienced team will take away the stress of any sewage problems and figure out what is required before building work can begin. The CCTV footage will map the drainage layout, identify ownership of the existing drainage and determine the drain depth. We compile all of this critical information and make it available to the architects at the extension planning stage.

Can You Build or Extend Over a Manhole or Drain?

The short answer is no. You are not allowed to build a conservatory or extend your home over a drain, manhole or pressurised pumping main as the water authority require access at all times. However, moving the manhole or redirecting the sewer if it is interfering with your plans is an option. In densely populated areas, this is more likely to be a problem and a build over CCTV survey will help establish if it is possible to proceed with a build, and if there is an issue, how to navigate around it.

Book a CCTV survey now


Why Drain Doctor


Get to grips with what is going on underground with our CCTV services.

We understand the urgency of a drainage disaster, which is why our teams are on call 24 hours a day, 365 days a year.

24/7, 365 Day Service

Our engineers are highly-trained across every service area, allowing them to easily identify & resolve your problem.

Professional Engineers

We provide a no obligation quote, with a free call out, before any work commences so you don't have any nasty surprises.

Fair & Ethical Pricing

With over 25 years’ experience, our local engineers have become a trusted partner for homeowners and businesses alike.

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Customer Reviews

Excellent and prompt service. Bad smell in kitchen and utility room. Called and engineer was at my house within an hour. Informed me of what the issue was and how I could resolve it myself. Thanks

Stephen Dale

Called and answered instantly, and came round within 30 minutes! Had a look and managed to fix my issue with a blocked drain instantly. Was very respectful of my home. Would definitely use this service again and recommend to all.

Ashley B

Very efficient service with good advice. We will use Drain Doctor again.

Wes Boswell

Super fast, super efficient and extremely polite and professional. I'd recommend them to anyone. They did the work so quickly, it's worth every penny.

Chris Luck

Visited my home within an hour of being called. Sorted out the problem quickly. Professional and friendly service. Very highly recommended.

Stephen James

I cannot recommend this company enough, booked me in straight away, arrived on time and unblocked my drain there and then. Really nice helpful bloke and excellent price , thanks

Geoffrey Crane

I have just had some crucial work done by Steve Berry of Drain Doctor. The work is first rate and Steve Berry was very polite and efficient. I would recommend Drain Doctor to everybody.

Anthony Garner

Quick response, friendly and efficient service. Really good service would recommend. Second time we have used Drain Doctor.

So Coco Rouge

Attended to my blocked toilet really quickly. Great prompt service.

Paul Cooper

Friendly bloke, came around quickly and unblocked the pipes within a few minutes. Definitely recommended.

Fabian F

Great prompt service, cleared my blocked drain, would highly recommend them to anyone, thanks Drain Doctor for a great service.


Very reputable company with a world class service 24/7. I highly recommend them.

Paul P

The Drain Doctor operative, Dan Hayler was extremely good. He took time to explain the situation and did a fantastic job of solving our problem. He is knowledgeable and courteous. I would highly recommend him and this company. Thank you for an excellent service.

Mandy Stuttard

Seriously brilliant company. Anna was so helpful and great on the phone in the booking. Clear job pricing, rather than hourly charges. We have had two other plumbers out to solve this issue without success. They used a camera to find the blockage which was a ceramic piece from previous building work. Can't recommend them enough!

Kathy Pavid

Very pleased with Drain Doctor and operator Dan. Had concerns about partial sewer main blockage and possible sewer pipe misalignment. Camera survey carried out first to identify issues, then complete high pressure clean, then follow up camera survey. First class professional and friendly service - would most certainly use again.

Roy Tubbs

Great service from Anna and her team. Dan carried out the work needed and was polite, friendly and explained what needed to be done.

Tracey Ridgers

Dan turned up within an hour even though it wasn't an emergency. He was professional and very helpful and even identified a hidden chamber that was also blocked. Great quality for a very reasonable price.

Nick Armitage

Called this morning for plumbing emergency. Attended within half an hour and problem fixed. Would highly recommend.

Katie Crawford

Can't recommend Graham Forbes and Drain Doctor enough! 3 hours graft and skilled use of some pretty scary high pressure equipment, camera tech, to break a fiendishly located fat and soap berg in the corner of our kitchen pipe work.

Andy & Katy Travers

Really quick service, called on a Sunday morning, with us within an hour with the job done quickly. I hope not to need my drains sorted again, but if I do, I'll be calling Scott!

Peter Wood

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