Leak Detection Dartford | Building Leak Investigations

Established in 1986

Pioneers of electronic leak detection in the UK

Over 35,000 successful tests

Excellent Client Reviews

Professional Roof Assessment & Leak Detection Service

Thornton Consulting provides expert water ingress investigation services to commercial property owners and facility managers throughout Dartford and North West Kent. With over 60 years of combined experience, we understand the unique challenges facing industrial and logistics hubs in the area, from warehouses and manufacturing facilities to town centre retail and office developments, and everything in between.

Our technical expertise addresses the full spectrum of waterproofing challenges affecting commercial buildings in the area. Whether managing ongoing leak issues at your Dartford premises, implementing preventative testing programmes, or requiring detailed documentation, we deliver precise, evidence-based assessments that enable confident decision-making. Our services encompass waterproof integrity testing, comprehensive roof condition surveys, and systematic building leak investigations, protecting your investment from water damage whilst minimising operational disruption.

How We Work

  • Planning

    Each project commences with a detailed, collaborative consultation to understand your water ingress concerns, building construction, and operational constraints. We review available documentation and site history to develop an efficient testing strategy that delivers comprehensive coverage and long-term value.

  • Testing

    Our experienced senior technicians deploy specialist electronic detection equipment matched to your building's construction. Utilising techniques including low voltage conductance testing, pinhole detection, and differential pressure methods (if the substrate is non-conductive), we systematically evaluate waterproofed areas to locate defects with precision.

  • Evidence

    We document every finding through accurate location mapping, detailed photography, and quantifiable measurements. This meticulous approach provides contractors with exact target areas, eliminating guesswork and ensuring repair works address genuine defects rather than pursuing speculation.

  • Recommendations

    Following analysis, we provide clear recommendations prioritised by severity and risk. Our guidance addresses both immediate repair requirements and strategic maintenance

Client Testimonials

I’ve worked with Thornton’s team for nigh on 10 years and I’m yet to be disappointed by any aspect of their business or interaction with any of their staff. I feel that the collaborative approach we have when working together not only benefits our site in a speedy response and solution, but it also strengthens our relationship with our onsite client team, building in faith that together we can self-solve most, if not all issues. Working with Wendy and the onsite teams is nothing short of a pleasure. I would highly recommend using Thornton Consulting Group for all investigative services when it comes to finding leak issues.

OCS Group (Bluewater)

Your team have successfully found the cause of the water ingress. I also wanted to write to express how impressed we are with the professionalism of both Sam and Dave and there health and safety whilst on site. I will be recommending Thornton Consulting going forward to the Hospital and will certainly use this service in the future with Carillion. Many thanks, and also for attending at such short notice.

Carillion Plc

We have worked with Thornton’s for several years now and we could not be happier with the service. The team are really helpful, accommodating and always happy to help us out if we are under pressure from a client. The team are always happy to take a call to discuss a project with them to get a clear understanding of the issues found on site. Thorntons always find the issues and provide a very thorough report to outline them with recommendations on repairs required.

Foxleys Fabrick & Building Maintenance

Thank you for your assistance with the DLI. The contractors used were fantastic and I would definitely recommend using them in the future.

Smart Property Development

Thornton Consulting are extremely professional, reliable and carry out a fantastic service with excellent communication throughout – we would recommend using them and we certainly will be using them again.

Rendall & Rittner

Just wanted to take a moment to commend your team for the works carried out on site. We are really pleased with the results.

TS, M

Thanks for the work carried out and the subsequent report. Sam and Dave were 1st class.

Complete Building Services Ltd

What You Receive

  • Report

    A professional technical report documenting our methodology, all findings, and expert recommendations. Structured for clarity, our reports communicate essential information to both technical teams and senior decision-makers.

  • Annotated Plans

    Scaled architectural drawings clearly marking every detected breach with precise location references. These annotated plans streamline the contractor quotation process and ensure repair works target confirmed defects efficiently.

  • Priorities

    A structured ranking distinguishing urgent defects requiring immediate attention from less critical issues suitable for programmed maintenance. This assessment framework supports effective risk evaluation and budget planning.

  • Programme Guidance

    Strategic recommendations addressing repair scheduling, appropriate timescales, and future inspection intervals. We help you establish maintenance regimes that maximise roof longevity and minimise emergency repair costs.

Coverage

Operating from our Kent base, our team provides comprehensive leak detection services throughout Dartford, North West Kent, and into South East London.

Dartford: DA1, DA2, DA3, DA4
Surrounding Areas: DA5, DA6, DA7, DA8, DA9, DA10, DA11, DA12, DA13, DA14, DA15, DA16, DA17, DA18

Key Areas: Dartford Town Centre, Bluewater Shopping Centre, Greenhithe, Swanscombe, Stone, Wilmington, Joydens Wood, Sutton-at-Hone, Hawley, Temple Hill, Joyce Green, Crayford, Erith, Bexleyheath, Sidcup, Longfield, Ebbsfleet, Northfleet

Latest Blog & Case Studies

To find out more about what we do and how we work, read our case studies and blogs below.

What is Waterproofing Integrity Testing?

Integrity testing of newly installed waterproofing membranes has become common place for new build projects, in particular large commercial constructions or apartment blocks, although it …

Get in Touch Today

Call us on 01342 410508, email us at mail@thorntonconsulting.co.uk or send us a message using the form below. A friendly member of our team will be in touch shortly.

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FAQs

Can you test large warehouse and distribution centre roofs?

Absolutely. Large-scale industrial and logistics facilities are a significant part of our work, particularly in areas like Dartford with substantial warehouse and distribution operations. Our equipment and methodology work effectively on the various waterproofing systems commonly found in industrial buildings, from traditional built-up felt to modern single-ply membranes and liquid-applied systems.

What's the difference between a leak investigation and integrity testing?

A leak investigation is reactive, conducted when water ingress is already occurring. We use a combination of techniques to trace the source of active leaks, which may involve electronic testing, moisture mapping, and visual inspection to understand water travel paths through the building fabric. Integrity testing is proactive, systematically evaluating waterproofing condition even when no leaks are apparent. It identifies latent defects before they cause water ingress, supporting preventative maintenance strategies. Many clients benefit from both testing methodologies, but if you’re not sure, please get in touch with Thornton Consulting today.

Will testing identify all potential problems with our roof?

Electronic leak detection is highly effective at identifying breaches in waterproofing membranes, which are the primary cause of water ingress. However, other roof issues such as structural defects, insulation problems, inadequate falls causing ponding, or general material deterioration require further assessment methods. That’s why we often recommend combining integrity testing with visual roof condition surveys for a complete understanding of your roof’s health. We’ll always advise on the most appropriate assessment approach for your specific situation, concerns, and budget.

Our Accreditations