For Property Owners & Occupiers
Independent surveys to assess the condition, suitability and performance of cavity wall insulation installations, as well as the external property condition.
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Professional extraction of failed, wet, contaminated or unsuitable cavity wall insulation through our accredited member firms.
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Independent verification and certification that cavities have been properly cleared of insulation and rubble following extraction works.
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Independent oversight and quality assurance throughout remediation and extraction projects from OSCAR Onsite member firms.
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Locate vetted and accredited OSCAR Onsite member firms throughout the UK.
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Not sure what to do, where to go or who to ask? We will try to help.
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Industry-leading training and accreditation programmes for installers and specialist contractors.
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OSCAR-developed qualifications in Cavity Wall Insulation Surveying, Inspection, Extraction and Clearance.
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Independent on-site assessments to demonstrate competence and compliance.
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Business, installer and homeowner membership programmes with ongoing support and compliance guidance.
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Developed by OSCAR Onsite, drawing upon over a decade of cavity wall insulation failure investigations across the UK, this CPD Accredited course bridges the gap between energy efficiency objectives and real-world building pathology.
The course aims to help delegates identify CWI and common failure mechanisms, recognise risk factors, understand property suitability, assess moisture-related concerns, and make informed, evidence-based decisions when surveying residential properties.
Through real case studies, practical inspection methodologies, and lessons learned from thousands of property assessments all across the UK, delegates will gain a deeper understanding of how cavity wall insulation interacts with the building envelope, why installations can fail, and the importance of balancing energy efficiency with long-term building performance, durability, and occupant wellbeing.
Find Out More & BookFree CWI Risk Check
Damp patches, black mould, cold walls, musty smells or higher heating bills — these can all be signs that your cavity wall insulation has failed. Take our free 2-minute risk assessment and get an instant indication of whether your property needs a professional inspection.
OSCAR Onsite's expertise in cavity wall insulation has been independently referenced across Parliamentary discussion, homeowner guidance and specialist industry media.
UK Parliament — Hansard
CWI issues and appropriately accredited providers referenced in House of Commons debate.
HomeOwners Alliance
OSCAR featured in independent homeowner guidance on CWI failures affecting UK properties.
Specialist Industry Media
Covered by Refurb Renovation News in specialist reporting on CWI issues.
Academic Research Context
Related coverage subsequently cited in peer-reviewed research published in Buildings (MDPI).
Your Energy Performance Certificate may record that your walls are "insulated (assumed)" — but what does that actually mean for the condition of your cavity wall insulation?
Understand EPC wording
Phrases like "insulated (assumed)" indicate an inference — not a specialist cavity inspection.
What an EPC cannot confirm
An EPC does not assess CWI condition, moisture, voids, settlement or external wall defects.
EPC vs specialist inspection
An OSCAR CWI Condition Inspection uses specialist equipment to assess the actual state of your cavity.
Find and read your EPC
Check the Walls section of your EPC on the official GOV.UK register, then return here to understand what it means.