Independent specialist moisture investigation for buildings.
We provide specialist, evidence-based investigations of moisture issues in buildings - supporting landlords, housing providers and facilities managers with reporting suitable for compliance, legal and insurance use.

Trusted by leading organisations across housing, commercial & public sectors.
A specialist approach to damp, moisture and mould
JAG is a specialist consultancy. We diagnose why moisture problems occur — combining building science, environmental data and on-site investigation to provide independent answers, not contractor estimates.

Identify the source of moisture
Trace ingress, condensation and interstitial defects to root cause — not surface symptoms.
Analyse the building fabric
Assess construction, materials and thermal performance to understand how moisture behaves.
Evidence-based reporting
Defensible, technical documentation suitable for compliance, legal and insurance use.
Support compliance & decisions
Inform remediation strategy, risk reduction and regulatory obligations including Awaab’s Law.
Investigative services supporting moisture diagnosis.
Damp & Mould Surveys
Independent diagnosis of persistent or recurring damp and mould in residential and commercial buildings.
Mould Air Quality & Surface Testing
Quantitative microbial sampling and IAQ analysis through accredited laboratory partners.
Legal Disrepair Surveys
Expert reports for housing disrepair claims, FFHH, Awaab’s Law and insurance proceedings.
Commercial Leak Detection
Non-destructive trace and access using thermal, acoustic and tracer-gas methodologies.
Water Escape
Post-escape moisture mapping, drying validation and reinstatement oversight.
Request a Call with a Specialist
Want to talk through your issues with our team? Give us a call today or get in touch through our forms
Working with organisations to help manage risk & compliance.

Social Housing
Local Authorities, Housing Associations and Registered Providers, supporting with Awaab’s Law and HHSRS compliance.
Facilities Management
Schools, care homes, healthcare estates and commercial offices requiring compliance-grade investigation.
Private Landlords & Letting Agents
Independent diagnosis to resolve tenant disputes and protect asset value.
High Net Worth & Private Clients
Discreet, expert-led investigation for prime residential and listed properties.
Suitable for compliance, legal and insurance use.
JAG operates within recognised quality, technical and procurement frameworks. Our reports are written to evidential standard and routinely relied upon by housing providers, insurers and legal teams.
Independent — no remediation contracting conflict
Authored by experienced specialists
Defensible methodology and chain of evidence

Discreet Air Testing for a High-Net-Worth Residence.
JAG carried out air and surface testing across a large residential property following historic damp and mould concerns. Testing across six rooms and AC unit vents found acceptable mould spore levels, giving the client reassurance and verified environmental data to support conversations with medical advisors.

Scope of works
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Carry out Air Testing to 6 rooms in the property.
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Carry out surface sampling (swabs) on the AC unit vents within the master suite and walk-in wardrobe.
Findings
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All sampled areas returned acceptable mould spore levels, with no indication of abnormal mould presence.
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AC unit vent surface sampling showed no significant mould prescence.
Key outcomes
The results reassured the client that mould growth was at normal levels and allowed the client to engage with their GP and medical advisors using verified environmental data.
What our clients say.
“I had a call from our disrepair contractor. I sent them your surveys to quote from. They wanted me to pass on their
thanks, as your surveys are very high quality and have all the information needed. This makes their job easier,
compared to other reports they receive.”
Lee Madden
Damp, Mould & Disrepair Team
“We worked closely with JAG on an Ombudsman level case. JAG carried out the initial damp and mould survey, which
allowed our contractor to carry out root cause remedial works. We found that the resident was still suffering with a cough,
carrying out a post inspection survey, air test and the use of IoT sensor data, JAG helped us identify potential issues. We
were then able to educate and support our residents and satisfy the Ombudsman.”
Michael Ryan
Assistant Director of Property and Estate Services
"We have worked with JAG over an 18-month period, in the build-up to Awaab’s Law. JAG and James’ knowledge and input were invaluable. We are all learning every day, and having JAG as our damp and mould partner has made a difference to how we look at damp and mould when it comes to our homes and prioritising our residents’ health.”
Lisa Turner
Head of Repair Operations - Peabody
Covering key cities across England & Wales — with portfolio coverage nationwide on instruction.
Portsmouth
Southhampton
Oxford
Birmingham
Bristol
Brighton
Winchester
London & the Home Counties
Cardiff
Swindon


