Drain Mapping & Locating | Express Drainage Solutions

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Over 20 years experience

We cover all of London & the South East

Commercial Drain Mapping, Charting & Location Services

Drain mapping is the process of accurately recording the route, depths, condition and connections of a drainage system without any excavation. Here at Express Drainage Solutions, we provide precise, non-invasive commercial drain mapping services across London and the South East.

We help developers, engineers, property managers and business owners to avoid the risk of digging and prevent costly delays. Our service also helps you to satisfy planning and compliance processes, so whether you need a full drainage mapping survey before a major build or a swift trace before you break ground near a manhole, our accredited engineers deliver the evidence-based reporting that your project hinges upon.

Request a quote for a commercial drain mapping survey with our team today.

 

 

What is drain mapping and why does it matter?

What is drain mapping?

Drain mapping is a non-invasive technique that combines commercial CCTV drain surveys, sonde tracing and GPS locating to identify where underground drainage is located. It also tells you how deep the system runs, along with how and where it connects to other assets, such as public sewers.

Sometimes, drainage mapping is also referred to as drain tracing or drain mapping surveys, but they all mean the same thing: a clear, accurate drainage plan or CAD drawing for your design, construction and compliance needs.

 

Why accurate drainage mapping is necessary

On your commercial site, if you hit an unknown pipe during excavation or piling work, it can be both expensive for your project and dangerous for anyone in the area.

Through accurate mapping, we help you avoid that risk, preventing costly redesigns and emergency repairs whilst also giving you the evidence of due diligence you need for planning authorities, building control and environmental regulators.

On top of that, it’s great support for long-term maintenance planning and for managing the long-term lifespan of your construction work. Whether you’re building on a commercial or residential site, the result is the same: certainty before work begins above all else.

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How Drain Mapping Works

Our drain mapping process combines cutting-edge technology with expert insight. We utilise commercial CCTV drain surveys to visually inspect the drains, while GPS location tools provide precise positioning data. This combination allows us to generate an accurate and comprehensive drainage map. 

Sonde drain mapping is a technique used to accurately locate and trace the path of underground pipes and drains. A small, battery-powered transmitter called a “sonde” is attached to a flexible rod and pushed through the drain. As it travels, a receiver on the surface detects the signal from the sonde, allowing technicians to map out the drain’s exact route, depth, and any potential blockages or defects.

Get in touch with the team today to find out more about our drain mapping services.

 

 

Who our commercial drain mapping service is for

We operate across London and the South East, providing rapid service for your time-sensitive project. We regularly work with:

  • Property managers and facilities teams: including estates, retail parks and industrial sites
  • Architects and consulting engineers: including pre-planning and design phases
  • Developers and main contractors: when preparing for any groundworks or structural changes
  • Local authorities and educational sites: including for extension and refurbishment works
  • Homeowners and building contractors: including building over manhole covers and shared drains

When do you need a drain mapping survey?

There are many projects and stages at which you may need to invest in the certainty of drain mapping, including:

  • Before construction, extensions or redevelopment begins. This is the same for any new builds, changes to the use of a building, creation of basements, car parks or hard landscaping work.
  • For planning applications and building regulations. This provides evidence of the existing layout and where it connects to public sewers or shared drains.
  • When building over or near drains and manholes. Helping to confirm the exact position, depth and direction of these assets before work starts.
  • Persistent drainage issues. Any recurrent and ongoing drainage problems, such as flooding, bad smells or subsidence around a building, can be highlighted.
  • Property purchase or asset handover. This supports your commercial due diligence and allows for long-term maintenance planning when you have established the layout of the drainage network.

Already experiencing blockages and flooding in relation to drainage? Then pair our mapping survey service with our emergency drainage team, and our team will ensure the issues are resolved swiftly.

1
Initial consultation and project briefing

Our team will discuss the location of your site, access and constraints around your drains, and what the purpose of the mapping survey is for, e.g. construction, redevelopment, compliance or maintenance. We can then agree on the output based on whether you need simple schematics or full CAD drainage plans.

2
CCTV drain survey

Our commercial CCTV drain surveys use high-resolution cameras to inspect the internal pipe condition. This can reveal any cracks, root ingress, displaced joints, blockages or collapsed sections, with imagery and video for evidential reports.

3
Sonde tracing and drain locating

A sonde is a small signal transmitter which we feed through your pipes alongside a camera or rod. A surface locator then maps the exact route and the depth of each run. From this tracing method, buried or unknown pipes can be identified without messy excavation.

4
GPS locating and above-ground data capture

GPS locating equipment captures the exact position of manholes, gullies, inspection chambers and additional assets. This allows us to generate data accurate enough to overlay with your architectural drawings and site plans, aiding your progress.

5
Analysis, CAD plans and reporting

Our experienced engineers can review the CCTV footage, sonde traces and GPS points with you to create a clear drainage layout plan. We tailor to schematic or full CAD requirements, with written reports and recommendations for any remedial work if required.

What you get from our drain mapping survey

Our drain mapping, charting and location services are tailored to what your project calls for. As part of our offering, we’re able to provide:

  • Drainage plans and CAD drawings: These clearly show pipe routes, diameters, materials, depths and flow direction, as well as manholes, chambers, gullies and connection points.
  • Condition reporting: We’ll provide a summary of the pipe condition from our CCTV inspection, with photographic stills and video recording of any defects we find.
  • Manhole and asset schedule: This is a list of locations, cover levels, invert levels and access notes for the existing drainage network.
  • Recommendations and next steps: We outline a prioritised list of any repairs, lining, cleaning or issues that require further investigation. Here, we can recommend drain jetting, commercial drain unblocking and emergency drain services.
  • Digital files for your design team: From PDF plans to other CAD-compatible formats, talk to us about what you require to help your project.

Our drain mapping services provide detailed plans, condition reports and asset records, supported by practical recommendations and digital files to help your team plan the next stage of your project.

Drain mapping costs and timescales

The cost of drain mapping depends on the size and complexity of your site, as well as the site access available. Confined spaces, traffic management issues and out-of-hours working can all factor into our quotes, but you can rest assured that our team will provide transparent quotations with no hidden extras.

Tell us what level of detail you need – from simple tracing to full CAD mapping and condition coding – and we’ll ensure you get a full quote.

Our on-site surveys can take from just a few hours to a full day depending on the scale of the site. Get a bespoke quote and a more accurate timeline by contacting us today.

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Book your commercial drain mapping survey today

Our accurate drain mapping keeps projects running on time and budget. Avoid compliance issues and excavation with expert, non-invasive surveys and clear reporting today. Contact us today to request your quote or to book your commercial drain mapping survey.

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Frequently Ask Questions

What is the difference between drain mapping and a CCTV drain survey?

A Commercial CCTV drain survey inspects the inside of your pipes to identify blockages, damage and other defects. Drain mapping establishes the route, depth and connections of the drainage network. We combine commercial CCTV inspection with tracing and locating equipment to provide a clearer picture of both the layout and condition of your drains.

What equipment do you use for commercial drain mapping?

We use specialist CCTV drain cameras, sonde transmitters, surface locators and GPS equipment to inspect and map your drainage network. Together, these tools help us record pipe routes, depths, connections and drainage assets, alongside any visible defects.

What is sonde drain mapping?

Sonde drain mapping uses a small signal transmitter attached to a drain camera or rod to trace underground pipes. A locator detects the signal from the surface, helping our engineers establish the pipe’s route and depth without excavation. It is particularly useful when existing drainage plans are missing or incomplete.

Can you locate drains without excavating?

Yes, we use sonde tracing and surface locating equipment to trace accessible underground drains without excavation. Access restrictions, obstructions or damaged pipes can limit how much of the network we can survey. Our engineers will explain any limitations and recommend further investigation where needed.

What will we receive after a commercial drain mapping survey?

Depending on the agreed scope, you can receive drainage plans, CAD drawings, CCTV footage, condition reports and a schedule of drainage assets. These can record pipe routes, depths, flow direction and connection points. We agree the level of detail and file formats with you before starting the survey.

Can you work with our architects, engineers or contractors?

Yes, we can tailor the survey and reporting to your project team’s requirements. Share your existing site plans, required drawing formats and survey objectives during the initial consultation so we can agree suitable outputs for design, groundworks or maintenance planning.

How long does a commercial drain mapping survey take?

A commercial drain mapping survey typically takes 4–6 hours on site, depending on the size and complexity of the network and available access. Reports are usually delivered within 5–7 days, with expedited reporting available for urgent projects. If our engineers identify an immediate problem, they’ll explain whether it can be addressed during the visit or requires separate work.

How much does commercial drain mapping cost?

The cost depends on the size and complexity of your drainage network, site access and the reporting required. Access restrictions, traffic management and out-of-hours working can also affect the quote. We tailor our pricing to the agreed scope, from simple drain tracing to full CAD mapping and condition reporting.

Can I get a cost estimate before booking?

Yes, we provide a detailed quote based on your site, the scope of the survey and the reporting required. Contact our team with your site location, any existing drainage plans and the level of detail you need so we can prepare an accurate quotation.