SERVICES

The leading UK and European structural investigation experts that use non destructive testing and technology at the forefront of what we do

HOW WE HELP
WHAT CAN WE DO FOR YOU?
PTSI
The HTA 3 Step process has transformed the Post-Tensioned Special Inspection process. Utilising GPR and Tomography we reduce structural damage while locating tendons, their profile and subsequent detection of any hidden defects.
  • Step 1: Location of Tendon Ducts, Depth & Profile Negating unnecessary asset damage from traditional exploratory stitch drilling
  • Step 2: Detecting Hidden Grouting Defects via Ultrasonics Using Tomography via Proceq’s Pundit Live Array
  • Step 3: Targeted Localised Opening Up Confirming the digital data with accurate breakout
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LOAD TESTING
The following list is not exhaustive, however it gives a good idea of the range of elements tested and the appropriate test methods.
  • Reinforced Concrete Suspended Floors
  • Prestressed Concrete Suspended Floors
  • Wood Wool Slabs
  • Parapets and Balustrades
  • Railway Station Platforms
  • Roofs
  • Freestanding Masonry Walls
  • Grouted Ground Anchors
  • Chemical Anchors
  • Remedial Wall Ties
  • Tensile Testing of Structural Fixings
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NEW TECHNOLOGIES
Merely owning a new technology is not enough; it is vital that the engineers on site have the GPR survey training required to read the data and interpret all the information available; digital and visual plus experience to provide definitive answers for the client.
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BUILDING INVESTIGATIONS
Expert Building Investigations across England with confidence built in

With over 30 years of hands-on expertise and laboratory-backed analysis, we deliver in-depth data and actionable insights via a combination of non-destructive testing (NDT), physical exposure techniques, and advanced material sampling.

HTA provides comprehensive and detailed Building Investigations across England, helping asset owners, consultants, and facilities managers gain clarity on building condition, compliance, and performance.
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CONCRETE CONDITION TESTING
Our Concrete Testing work falls into two main categories; first, the condition of the concrete and second the construction details of the concrete itself. These lists are not exhaustive, but give you a flavour of the length and depth of the work we cover.
  • Covermeter Survey ‘UKAS’
  • Determine the protective thickness of the concrete covering the reinforcement bars
  • Half-Cell Potential Survey ‘UKAS’
  • Determine the risk of reinforcement corrosion of the embedded reinforcement
  • Depth of Carbonation Survey ‘UKAS’
  • Determine Carbonation depth and its associated risk with reinforcement corrosion
  • Extraction of Dust Samples ‘UKAS’
  • Ascertaining levels of contaminants in the concrete eg chloride levels
  • Extraction of Core Samples ‘UKAS’
  • Determining material characteristics of the concrete eg cement, sulphate & alkali contents
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SURVEYS
All Buildings and Structures have a designed life span, therefore it is paramount to ascertain their condition to determine what, if anything needs to be carried out. As far as possible HTA utilise the latest Innovative and Non Destructive Technology to determine the presence of Hidden Defects.
  • Ground Penetrating Radar
  • Tomography
  • Foundation & Slab Investigations
  • Corrosion Condition Survey
  • Slip Resistance
  • Regent Street Disease
  • Covermeter Surveys
  • Pre-Sale Surveys
  • Delap Survey
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MEET THE TEAM

Warren Thomas

Warren Thomas

Managing Director

Founder & Director and as of 2025, Sole Owner of Henderson Thomas Associates (HTA) | Structural, Building & Rail Investigation & Testing Specialist | Advocate for Knowledge Sharing throughout our industry

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Stuart England

Stuart England

Senior Associate Director

Team lead specialising in structural investigation, ensuring the safety and integrity of buildings and infrastructure.

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William Mower

William Mower

Senior Engineer

Senior Engineer at Henderson Thomas with 8+ years of experience in structural investigations, specialising in bids, tendering, engineering management, and project delivery.

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Ben Griffiths

Ben Griffiths

Operations Manager

Engineer at Henderson Thomas since 2020, overseeing site investigations, project delivery, and pre-site coordination while developing extensive expertise in specialised testing equipment and structural assessment techniques.

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