Call Us Freephone:

03335 77 66 55

Email Us:

office@oscar-onsite.co.uk

Opening Hours:

Mon–Fri 9:00am to 5:00pm

Independent Property Assessment

Concerned About Damp, Mould or Failed Cavity Wall Insulation?

OSCAR Onsite's independent CWI Condition Inspection Survey combines external building assessment, borescope cavity inspection and evidence-led reporting to identify cavity defects, moisture ingress risks, insulation failures and property suitability concerns.

Borescope Cavity Inspection
Full Photographic Reporting
External Building Assessment
Independent Recommendations
Nationwide Coverage

Speak To An OSCAR Survey Specialist Today

Independent Surveys  |  Detailed Reporting  |  Nationwide Coverage

03335 77 66 55

The UK's Leading Authority in Cavity Wall Insulation Surveying, Inspection & Extraction

About the Survey

CWI Condition Inspection Survey

OSCAR Onsite is recognised as one of the UK's Leading Authorities in Cavity Wall Insulation Surveying, Inspection, Extraction and Clearance. We developed and launched the industry's only dedicated vocational qualifications in Cavity Wall Insulation Surveying & Inspection, and Cavity Wall Insulation Extraction & Clearance, helping to establish recognised standards, methodologies and competency pathways for the sector.

Our CWI Condition Inspection Survey has been specifically designed to assess both the condition of the cavity wall insulation and the overall external condition of the property. The survey helps determine whether the insulation is performing as intended and delivering the energy efficiency benefits expected, or whether defects, moisture ingress, weatherproofing issues or cavity-related concerns may be affecting performance.

RICS
Partner accredited programme
NVQ
Qualified surveyors on every job
33%
Average heating cost saving when working correctly
100%
Reports signed off by a Chartered Surveyor

The survey includes a detailed external assessment of the property together with borescope cavity inspections where appropriate, enabling our surveyors to identify issues such as damp and moisture ingress, cavity debris, mortar bridging, insulation defects, building defects and other factors that may impact the effectiveness of the cavity wall insulation system.

Many homeowners instruct OSCAR Onsite when they have concerns regarding damp, mould, cold spots, condensation or suspected cavity wall insulation failure. Our independent reports provide a clear, evidence-based assessment of the property and can help homeowners understand the cause of any issues identified.

Our surveys are also regularly commissioned by homeowners who have submitted claims under cavity wall insulation guarantee schemes and require an independent professional assessment. Where defects or concerns are identified, our reports can provide valuable supporting evidence when referring complaints back to installers, guarantee providers or other interested parties.

For prospective property purchasers, a CWI Condition Inspection Survey can provide additional confidence when buying a property with existing cavity wall insulation. The survey can help confirm the condition of the installation, identify any concerns requiring further investigation, and ensure that appropriate guarantees and supporting documentation are in place. More and more solicitors are now taking note of CWI and guarantees through the conveyancing process.

Whether you are experiencing problems, purchasing a property, making a guarantee claim, or simply seeking peace of mind, OSCAR Onsite's Cavity Wall Insulation Condition Inspection Survey provides an independent, evidence-led assessment designed to help you make informed decisions about your property.

Get Started

Order Your CWI Condition Inspection Survey Today

Our RICS-partnered, independently certified surveys give you a complete picture of your cavity wall insulation's condition — protecting your home, your investment and your health.

Book a Survey

Scope of Works

What Our Standard Survey Includes

Our standard CWI Condition Inspection Survey covers eight key areas across all elevations of your property, giving a comprehensive assessment of both the insulation and the external fabric of the building:

CWI Condition Check

Full condition check on all elevations to assess the state of the cavity wall insulation.

Brickwork Condition

Detailed inspection of brickwork condition across all elevations of the property.

Pointing on All Elevations

Assessment of mortar pointing between bricks to identify any deterioration or gaps.

Windows & Seals

Inspection of all windows and their seals on all elevations to check for water ingress risk.

Doors & Seals

Assessment of all external doors and associated seals across every elevation.

Damp Proof Course

Inspection of the damp proof course on all elevations for signs of bridging or failure.

FSG (Fire Stop / Gap)

Checking of fire stop gaps on all elevations in line with current standards.

Any Other Areas of Concern

Identification and reporting on any additional issues observed during the survey.

Technical Assessment

Additional Technical Checks

In addition to the standard visual checks, our surveyors carry out a detailed technical assessment covering the following areas, using specialist equipment including borescopes to inspect within the cavity:

  • Exposure to walls from wind-driven rain
  • Drill patterns of the installation
  • Size and condition of drill holes
  • Cavity trays and weep holes
  • Brushing off between properties
  • Location of internal dampness, mould and/or condensation
  • Type of insulation installed
  • Overall wall thickness
  • Location and condition of damp proof course
  • Internal temperature and relative humidity
  • Voids in the insulation
  • Spalled brickwork
  • Deteriorated pointing between bricks

Book Now

Order a Condition Inspection Survey

Our accredited surveyors will carry out a full technical inspection of your cavity wall insulation and provide a detailed report on its condition, signed off by a Chartered Surveyor.

Book a Survey

Who It's For

Who Needs a CWI Survey?

Oscar Onsite have experience working across many sectors including residential, education and retail. Whoever you are, we can provide the professional help you need.

Homeowners with Damp or Mould

If you are experiencing persistent damp, mould or cold spots, a CWI Condition Inspection Survey identifies whether your cavity wall insulation is the root cause.

Refused Guarantee Claims

Our independent surveys, signed off by a Chartered Surveyor, can be used to refer complaints back to CWI guarantee providers where faults are identified.

Property Buyers & Sellers

More buyers are requesting a CWI condition survey before or after purchase to fully understand the property's insulation and energy saving measures.

Mortgage Lenders & Insurers

Lenders and insurers increasingly require evidence of property maintenance. Our survey provides documented assurance of the cavity wall insulation's current state.

Our Process

How the Survey Works

From booking to final certified report, our streamlined process ensures you receive a thorough, independent and professionally documented assessment.

Step 1 – Book Your Survey

Contact the Oscar Onsite team to arrange your Cavity Wall Condition Inspection Survey. An accredited Oscar Onsite surveyor will be assigned to your property.

Step 2 – On-Site Inspection

Our qualified surveyor carries out a comprehensive on-site inspection using specialist equipment including borescopes to examine the insulation and all external elevations in detail.

Step 3 – Detailed Report & Certification

Following the inspection, a full written report is produced covering all findings. The report is independently signed off by a Chartered Surveyor, giving homeowners, buyers and lenders complete confidence in the outcome.

Cavity Wall Insulation Condition Survey

Frequently Asked Questions

Have questions? Speak with our expert team today, or visit our Support Hub for quick answers.

Contact us Support Hub

Oscar Onsite are the UK's Leading Authority in Cavity Wall Insulation Surveying and Extraction. Oscar Onsite wrote and launched the only two formal NVQ qualifications specific to this industry, highlighting the correct process, methodology and compliance required. Oscar Onsite have trained hundreds of independent firms right across the UK and Ireland in CWI extraction. Firms displaying the Oscar Onsite logo have achieved a high level of understanding and demonstrated full compliance, ensuring a professional and quality service for their customers.

A CWI Condition Inspection Survey is a comprehensive independent survey that assesses the current condition of your cavity wall insulation and the external condition of your property. It examines whether the insulation is working correctly to deliver the average 33% heating cost savings, and identifies any issues — such as damp, voids, failing brickwork or mortar — that may be causing or contributing to problems in your home.

You may need a survey if you are experiencing damp, mould or cold spots in your home, if your CWI guarantee claim has been refused, if you are buying or selling a property, or if a mortgage lender or insurer requires documented evidence of the property's insulation condition. Our surveys are also used by homeowners who want to understand the energy efficiency of their home and take proactive action before problems worsen.

Yes. Our surveys are carried out fully independently by qualified surveyors and signed off by a Chartered Surveyor. If the survey highlights faults demonstrating that the CWI was not installed in line with the BBA Certificate, these reports can be used to refer your complaint back to the CWI guarantee provider and support your claim.

All Oscar Onsite surveys are carried out by NVQ-qualified surveyors and signed off by a Chartered Surveyor (RICS). The survey is fully independent — Oscar Onsite are not affiliated with any CWI installation company or guarantee provider, so you can be confident the findings are objective and impartial.

The report covers the full condition of the cavity wall insulation on all elevations, brickwork condition and pointing, windows and door seals, damp proof course, FSG checks, any areas of concern, exposure zone assessment, drill pattern and drill hole condition, internal dampness and humidity readings, cavity tray and weep hole assessment, voids in the insulation, wall tie condition and overall wall thickness. The report is formally documented and signed off by a Chartered Surveyor.

You can book a survey by calling our freephone number 03335 77 66 55 (Monday to Friday, 9am–5pm) or by completing our online enquiry form. One of our team will arrange for an accredited Oscar Onsite surveyor to visit your property at a time that suits you.

Yes. Oscar Onsite have experience working across many sectors including residential, education and retail — covering all types of residential and commercial properties. Whatever your requirements, we can provide the professional help and assistance you need.

Next Steps

What you need to do now?

Having your property assessed by Oscar Onsite's experienced surveyors is the first step towards identifying and resolving issues associated with failed cavity wall insulation, penetrating damp, condensation, and mould growth. Defective or saturated cavity wall insulation, combined with external building defects, can significantly affect the performance of a property and lead to ongoing moisture-related problems if left unaddressed.

At Oscar Onsite, our qualified specialists provide comprehensive cavity wall inspections and independent technical assessments to accurately identify the root cause of damp-related concerns. Where failed cavity wall insulation is found to be contributing to moisture ingress, we can recommend and undertake appropriate remedial measures, including cavity wall insulation extraction and associated corrective works.

Accurate diagnosis is essential. Misidentifying the source of dampness can result in unnecessary expenditure and ineffective remedial works. Our surveyors adopt a practical, evidence-based approach to investigating building defects, ensuring property owners receive clear, impartial advice and cost-effective solutions tailored to their specific circumstances.

Our cavity wall surveyors can inspect your property, assess the condition and suitability of the existing cavity wall insulation, identify any associated defects, and provide professional recommendations on the most appropriate course of action.

Get In Touch

Ready to Book Your Survey?

Complete the form and one of our team will be in touch to arrange your independent Cavity Wall Condition Inspection Survey — carried out by qualified surveyors and signed off by a Chartered Surveyor.

Call Us Freephone

03335 77 66 55

Opening Hours

Mon–Fri, 9:00am – 5:00pm

All surveys are independently carried out by NVQ-qualified surveyors and signed off by a Chartered Surveyor (RICS).

Book a Survey

Please fill in the form below and we'll get in touch with you