Professional Roof Assessment & Leak Detection Service
Thornton Consulting specialises in investigating and analysing water ingress and leaks in commercial buildings and facilities across London and the surrounding areas. Our professional approach combines precision diagnostics tools with in-depth technical investigations to locate the source of leaks and provide recommendations for repairs to ensure your building remains in excellent condition and maintains its waterproof integrity.
Whether you're experiencing an ongoing leak at your London office, implementing a forward-thinking maintenance strategy, or seeking rigorous technical documentation for facility management or property assessments, our qualified experts provide exact, trustworthy evaluations designed to meet your particular business needs.
We execute comprehensive surveys, programmed roof inspections, and waterproof integrity testing in London for commercial developments and major residential estates. We take great care to effectively control all possible leak risks, enhance your roof's performance longevity, and safeguard your significant property investments.
Our Services
How We Work
Planning
Every project begins with a thorough consultation to understand the nature of your leak concerns, the building's construction and roof build-up, and the extent of any previous remedial work. We take the time to review architectural drawings, waterproofing specifications, and site history to develop a targeted leak detection and testing strategy tailored to your specific needs while minimising disruption to your day-to-day schedule.
Testing
Our experienced technicians deploy innovative, industry-leading electronic leak detection methods tailored to your building's construction. Where exposed, waterproofing membranes are primarily tested using the low voltage (“wet method”) or the holiday/pinhole method where the substrate is conductive. We can also utilise other test methods where the substrate is non-conductive or the membrane is not suitable for traditional electronic leak detection methods, such as differential pressure testing. All testing is conducted methodically to ensure comprehensive coverage and accurate results.
Evidence
Throughout the investigation, we meticulously assess and document every finding with precise location data, digital photography, and detailed notes. Our equipment provides quantifiable measurements that pinpoint leak locations to the centimetre, eliminating speculation or guesswork and ensuring contractors can access the exact areas requiring attention.
Recommendations
Following our analysis, we provide clear, actionable remediation recommendations. Our leak detection reports outline the most appropriate repair strategies, estimated scope of work, and guidance on preventative measures to protect your building's long-term waterproof integrity.
What You Receive
Report
A comprehensive technical document detailing our methodology, findings, and professional assessment will be delivered. Each report will include photographic evidence of findings along with conclusions and recommendations, alongside detailed technical analyses for contractors, building owners, and operational managers to assess.
Annotated Plans
You’ll receive scaled and clear drawings which pinpoint the exact location of every detected breach or area of concern. These annotated plans eliminate any ambiguity and enable accurate quotations from roofing or building contractors.
Priorities
We’ll deliver a clear assessment of which defects require immediate attention and which can be addressed during planned maintenance cycles. This helps you allocate budgets and resources more effectively and manage risk appropriately.
Coverage
Our leak detection specialists provide comprehensive services throughout the City of London and its surrounding boroughs. We work extensively with property managers, facilities teams, and building owners across all areas of the capital.
Central London: EC1, EC2, EC3, EC4, WC1, WC2
West London: W1, W2, W8, W11, SW3, SW5, SW7
East London: E1, E14, E15, E20
North London: N1, N7, N19, NW1, NW3
South London: SE1, SE10, SE16, SW1, SW8, SW11
Key Areas: City of London, Westminster, Camden, Islington, Hackney, Tower Hamlets, Southwark, Lambeth, Wandsworth, Kensington & Chelsea, Hammersmith & Fulham, Canary Wharf, Stratford, King's Cross
Case Studies
FAQs
How long does a building leak detection survey typically take?
The duration varies depending on the size and complexity of your building, as well as the source of the leak. A typical roof survey can take anywhere from half a day for smaller buildings to several days for large multi-level developments. We always provide an estimated timeframe during our initial consultation and work efficiently to minimise disruption and get you back to your daily routine as quickly as possible.
Can leak detection testing damage our existing roof or waterproofing?
Our electronic leak detection methods are entirely non-destructive and designed specifically to preserve the integrity of your existing waterproofing systems. The test equipment we use will not harm the waterproofing; it purely detects breaches in the membrane which can then be repaired with a suitable product.
What happens if leaks are found during the survey?
If we identify breaches in your waterproofing, we provide you with a detailed report showing exact locations, photographic evidence, and clear recommendations for remedial action. We'll explain the severity of each defect and advise on priorities. We will provide clear information on the most appropriate solution for repair.