Drain Mapping & Asset Location Services in Twickenham & South West London – 24/7 Drainage Engineers

Drain mapping provides accurate information about the location, route and condition of underground drains and utilities. It is essential for safe construction, planning approval, build-over agreements, and preventing accidental strikes during groundwork.

CCTV surveys assess internal pipe condition (defects, roots, cracks). Drain mapping combines CCTV with tracing (sonde/EM), GPS and depth readings to create accurate plans of routes, connections and levels. They are often delivered together for a complete picture.

We use high-definition CCTV, sonde tracing, electro-magnetic (EM) detection, and ground-penetrating radar (GPR). For metallic and non-metallic pipes we deploy transmitters and sondes to obtain route, depth and connection data with minimal disruption.

Typical horizontal accuracy is within site-appropriate tolerances for construction planning (often ±100–300 mm depending on conditions). Depths are recorded at key nodes (manholes, junctions, changes in direction/gradient). We can align to site grids or OS coordinates on request.

Yes. Using sondes inserted via access points and GPR/EM techniques, we accurately trace non-metallic pipes (uPVC, clay, concrete) and locate manholes, laterals and unknown connections.

You’ll receive a clear PDF report with annotated plans, depths, pipe sizes/materials, photos and CCTV findings. CAD (DWG/DXF), GIS (SHP/GeoJSON) and layered utility drawings are available. We can include GPS coordinates, manhole schedules and defect coding.

Most domestic reports are issued within 24–48 hours of the survey. Larger commercial sites or CAD/GIS deliverables typically complete within 3–5 working days depending on scale and data requirements.

Yes. We follow HSE HSG47 (“Avoiding Danger from Underground Services”) and can deliver utility mapping aligned with PAS 128 methodology when specified, helping de-risk excavations and satisfy CDM requirements.

Yes. We can locate and map foul and surface systems, septic tanks, soakaways, interceptors, and attenuation crates, including levels and connections where accessible.

Pricing depends on site size, access, number of manholes, tracing complexity and deliverables (PDF only vs CAD/GIS). We offer fixed, upfront quotes with no hidden extras after a short scoping call.

Most homes are completed in around half a day. Larger commercial or multi-block sites may require 1–2+ days depending on the number of access points and tracing required.

Yes — we’re available 24/7 for urgent tracing, mapping and utility location to support time-critical works and make sites safe.

Please ensure access to manholes/inspection chambers, clear parking for our van, and permission to enter relevant areas. If chambers are sealed or buried, tell us in advance so we can allow for lifting/reinstatement.

Mapping is typically non-invasive. Minimal lifting of existing chambers is required. Only in rare cases do we recommend small trial holes—if so, we’ll quote and fully reinstate surfaces after works.

Yes. We regularly schedule early-morning, evening or weekend visits for schools, healthcare sites and busy commercial premises.

For private land, no special permission is usually required. Works on, or affecting, public sewers/highways may require permits or build-over consent (e.g., Thames Water). We can advise and support the process.

Yes. We carry full public liability insurance and guarantee our reporting accuracy to the agreed scope. Documentation can be provided for your principal contractor or CDM file.

You own the deliverables we produce for your project. We can revisit to update drawings after alterations, extensions or new connections so your asset records stay current.

We cover Twickenham, Kingston, Surbiton, Richmond, Barnes, Teddington, Ealing, Chiswick, Hampton, Staines and wider South West London.