Oscar Onsite

Independent cavity wall insulation surveys and accreditation across the UK

Oscar Onsite is a UK training and compliance company focused on cavity wall insulation (CWI). It describes itself as the UK's leading authority in CWI extraction, a position it states in its own presentation rather than as an external ranking. The organisation was set up in response to a growing cavity wall insulation crisis affecting homeowners, tenants, landlords and housing providers across the United Kingdom, as reports of damp, mould, moisture ingress and failed installations increased. According to its own account, no recognised occupational standards, methodologies or formal competency pathways dedicated specifically to CWI existed at that point.

The company works on two fronts: services for property owners and occupiers, and training, qualification and accreditation for businesses and operatives in the sector. It states that it operates throughout the UK and works with firms of all sizes, engaging with clients across the supply and installation life cycle.

Surveys and reports for homeowners, landlords and tenants

The core homeowner service is a Cavity Wall Insulation Condition Inspection Survey. Qualified surveyors carry out independent technical assessments of cavity wall insulation, together with weathertight and watertight checks, and produce a report on the condition of the installation and the remedial works suggested. The company presents these reports as independent, impartial and professionally signed, and notes that they are used by homeowners and lenders.

Oscar Onsite also addresses the limits of an Energy Performance Certificate. It points out that an EPC may record walls as "insulated (assumed)", which reflects an inference rather than a specialist cavity inspection, and that an EPC does not assess CWI condition, moisture, voids, settlement or external wall defects. Its own inspection uses specialist equipment to assess the actual state of the cavity.

Extraction, clearance and certification

Through its accredited member firms, the company offers professional extraction of failed, wet, contaminated or unsuitable cavity wall insulation. After extraction works, it provides independent verification and certification that cavities have been properly cleared of insulation and rubble, a document described as accepted by homeowners, surveyors, solicitors and mortgage lenders.

Technical monitoring is a further service: Oscar Onsite can attend site to verify and monitor that extraction and clearance have been completed to the required standard, whether the work is carried out by a member firm or an independent contractor. The company also maintains a directory of vetted and accredited member firms so that property owners can locate extraction specialists near them, and it offers support to homeowners, landlords and tenants who are unsure how to proceed, including help with guarantee and insurance claims and CIGA guarantee claims.

Training, qualifications and accreditation for businesses

For contractors and businesses involved in CWI extraction and clearance, Oscar Onsite runs training and accreditation programmes covering both companies and operatives. These include NVQ qualifications in Cavity Wall Insulation Surveying, Inspection, Extraction and Clearance, which the company describes as the industry's only dedicated NVQ in this field. Independent on-site competency assessments are available to demonstrate competence and compliance, alongside business, installer and homeowner membership schemes with ongoing support and compliance guidance.

The company also delivers a CPD-accredited one-day online course, CWI Awareness for Surveyors, described as fully interactive. It was developed drawing on more than a decade of cavity wall insulation failure investigations across the UK and aims to bridge the gap between energy efficiency objectives and real-world building pathology. The course covers identifying CWI and common failure mechanisms, recognising risk factors, understanding property suitability, assessing moisture-related concerns and making evidence-based decisions when surveying residential properties, supported by real case studies and inspection methodologies. It is aimed at residential, building and chartered surveyors, property inspectors, housing associations, local authority officers, retrofit assessors, coordinators and designers, energy and EPC assessors, damp and timber surveyors, building pathologists, property managers, letting agents, estate agents, construction professionals and insurance and claims professionals.

Track record and industry references

The company cites more than ten years of experience, support for over 250 businesses, CPD-accredited training, thousands of properties assessed and UK-wide coverage. It also states that its expertise has been referenced in Parliamentary discussion recorded in Hansard, in homeowner guidance published by HomeOwners Alliance, in specialist reporting by Refurb Renovation News and in related coverage subsequently cited in peer-reviewed research published in Buildings (MDPI).

Oscar Onsite also offers a free two-minute online risk check for property owners concerned about damp patches, black mould, cold walls, musty smells or higher heating bills, which it presents as signs that cavity wall insulation may have failed.