Oscar Onsite

12/10/2026

Energy Performance Certificates

Check Your EPC

Your EPC may include useful information about your property's recorded wall construction and insulation — but an EPC is an energy assessment, not a specialist cavity wall condition inspection.

This page explains what your EPC can and cannot tell you about your cavity wall insulation.

Explore industry references, standards and guidance supporting Oscar Onsite’s cavity wall insulation surveying, extraction, training and compliance services across the UK.

12/10/2026

Is Your Cavity Wall Insulation Causing Problems?

Answer 12 quick questions about your property and get an instant risk score.

No obligation, no cost — just clarity on whether you need a professional inspection.

12 Questions
Instant Result
100% Free

Get a CWI risk check to identify potential workplace risks, understand key safety considerations and take practical steps to manage them effectively.

12/10/2026

CAVITY WALL INSULATION FAILURE CLAIM

CIGA Guarantee Claims:
What Homeowners Should Check Before Making a Claim

If your property has cavity wall insulation covered by a CIGA guarantee and you are experiencing damp, mould, cold areas, condensation or concerns about the condition of the insulation, it can be tempting to assume that the CWI has failed.

But a symptom is not the same as a diagnosis.

Before making significant decisions — and particularly before allowing cavity wall insulation to be extracted or substantially disturbed — OSCAR Onsite recommends establishing the history of the installation, gathering the available documentation and obtaining evidence of the current condition of the cavity and insulation.

If your property has cavity wall insulation covered by a CIGA guarantee and you are experiencing damp, mould, cold areas, condensation or concerns about the condition of the insulation, it can be tempting to assume that the CWI has failed.

03/10/2026

🏠 CONCERNED ABOUT YOUR CAVITY WALL INSULATION?

Damp, mould, cold walls or musty smells don't automatically mean your cavity wall insulation has failed. The important thing is establishing what is actually causing the problem.

This short video explains the OSCAR Onsite Cavity Wall Insulation Condition Inspection Survey and what we actually look for during an inspection.

The survey starts with the property itself. We inspect potential routes for water ingress including fascias, soffits, guttering, downpipes, drainage, windows and doors, seals, brickwork, pointing and the damp-proof course.

We then go inside the walls using specialist borescope equipment to physically inspect the cavity and look at:

🔎 The condition and distribution of the existing insulation

💧 Evidence of moisture or dampness

🧱 Rubble, debris or other cavity obstructions

⚠️ Voids, sparse fill or areas where insulation may be absent

The findings are then brought together in a detailed CWI Condition Inspection Report, providing the homeowner or landlord with evidence of what was actually found.

That evidence can be particularly important where there is a CWI guarantee claim, complaint, damp investigation, property purchase or dispute over whether remedial work or extraction is actually necessary.

We don't start by assuming the insulation needs removing.

We inspect the property, inspect the cavity and let the evidence determine what happens next.

▶️ Watch the video:
https://www.youtube.com/watch?v=dgTTgPUorrs

Independent inspection. Evidence before intervention.

https://oscaronsite.co.uk

Oscar Onsite are the UK’s Leading Authority in Cavity Wall Insulati...

03/10/2026

🔍 LOOKING FOR A CAVITY WALL INSULATION SPECIALIST?

Finding somebody who says they can remove cavity wall insulation is easy.

Finding a contractor who has been vetted, assessed and accredited specifically for CWI work is rather more important.

OSCAR Onsite's Find a Member service connects homeowners, landlords and property professionals with OSCAR-accredited contractors operating across the UK.

The service is completely free to use.

Our accredited network provides services including:

✔️ Cavity Wall Insulation Condition Inspection Surveys
✔️ CWI extraction
✔️ Cavity clearance
✔️ Remedial works
✔️ Appropriately qualified operatives
✔️ Independently monitored and certified works Oscar Onsite

And importantly, we don't believe cavity wall insulation should simply be removed because a property has damp, mould or cold walls.

The cause should be properly investigated first, so that any work recommended is based on evidence rather than assumption.

Enter your property details and OSCAR will help connect you with an accredited member covering your area.

👇 Find an OSCAR Onsite Accredited Member

Find approved CWI members across the UK. Search for qualified installers, surveyors, and compliance professionals connected with the Oscar Onsite network.

03/10/2026

🏠 WORRIED ABOUT YOUR CAVITY WALL INSULATION?

Damp patches?
Black mould?
Cold walls?
Musty smells?
Higher heating bills?

These symptoms don't automatically mean your cavity wall insulation has failed — but they can be a reason to investigate what's actually happening inside the cavity.

An OSCAR Onsite CWI Condition Inspection Survey provides an independent assessment of the insulation and its condition.

🔎 Borescope inspection of the cavity
🏠 Assessment of insulation presence and distribution
📸 Photographic evidence from the inspection
💧 Investigation of relevant damp/moisture concerns
📋 Detailed written findings
⚖️ Independent evidence where there is a complaint, dispute or guarantee issue

Importantly, we don't start with the assumption that the insulation needs removing.

The purpose of the inspection is to establish the evidence first.

Whether your CWI was installed recently or many years ago, if you're concerned about its condition, OSCAR can help you understand what is actually going on.

Find out more about an OSCAR CWI Condition Inspection Survey:
CWI Condition Inspection Survey — OSCAR Onsite

Inspect first. Understand the problem. Then decide what action is actually necessary.

Independent CWI condition inspection surveys for homeowners, landlords, and housing providers to identify cavity wall insulation failure, damp risks, and remedial requirements.

03/10/2026

🏠 WHAT DOES YOUR EPC ACTUALLY TELL YOU ABOUT YOUR CAVITY WALL INSULATION?

Have a look at your latest EPC. You may see wording such as:
“Cavity wall, as built, insulated (assumed)”
That word “assumed” matters.

An EPC is an energy assessment. It isn't a specialist inspection of the cavity and doesn't necessarily establish the current condition of the insulation, whether it is evenly distributed, whether there are voids or settlement, or whether moisture has affected it.

We've added a new page to the OSCAR Onsite website to help homeowners understand exactly what their EPC can — and importantly cannot — tell them about their cavity wall insulation.

It takes just a few minutes to check your EPC, and we've provided a simple step-by-step guide explaining where to look and what the different wording means.

If you're experiencing damp patches, black mould, cold areas on walls, persistent condensation or deteriorating internal finishes, your EPC can be a useful starting point — but those symptoms don't automatically mean your cavity wall insulation is responsible.
Proper investigation is important.

Check your EPC. Understand what it says. Know when further investigation may be worthwhile.

Check Your EPC

OSCAR Onsite — inspect first, investigate properly, recommend only what the evidence supports.

Explore industry references, standards and guidance supporting Oscar Onsite’s cavity wall insulation surveying, extraction, training and compliance services across the UK.

03/10/2026

IS YOUR CAVITY WALL INSULATION CAUSING PROBLEMS?

Damp patches? Cold walls? Musty smells? Mould? Condensation? Or perhaps you're simply unsure what was installed in your home and whether it's still performing as intended.

Before you pay anybody for an inspection, take the OSCAR Onsite FREE Cavity Wall Insulation Risk Check.

12 simple questions.
Around 2 minutes.
Instant risk result.
No technical knowledge needed.

The check looks at the property, the insulation, exposure and some of the common warning signs we encounter during independent Cavity Wall Insulation Condition Inspections.

Your result will help indicate whether there appears to be LOW, MODERATE or HIGHER RISK and whether further investigation may be appropriate.

It isn't a survey and it can't see inside your walls — but it can help you decide whether there is a reason to look further.

And importantly, not every property needs an inspection.
That is exactly why we've created it.

Take the FREE OSCAR Onsite Cavity Wall Insulation Risk Check:

Start the free 12-question CWI Risk Check

Oscar Onsite
Independent inspection • Technical monitoring • Cavity Wall Insulation expertise

Get a CWI risk check to identify potential workplace risks, understand key safety considerations and take practical steps to manage them effectively.

21/08/2026

Why might a homeowner, Landlord, Local Authority or Housing Association require a Cavity Wall Insulation Condition Inspection Survey ?

> An EPC can tell you

The recorded wall construction type (e.g. cavity, solid)

Whether cavity wall insulation appears to have been installed, based on visual evidence

The energy efficiency rating assigned to the walls

Potential improvement recommendations

The date and scope of the energy assessment

> An EPC may not establish

Whether the cavity has been physically inspected by a specialist

The current condition of the insulation

Whether insulation is evenly distributed throughout the cavity

Whether voids, settlement or gaps are present

Whether moisture has entered the cavity or affected the insulation

Whether external building defects are compromising the wall

Whether the insulation was installed correctly or to the appropriate standard

> A Cavity Wall Insulation Condition Inspection Survey can tell you

Whether cavity wall insulation is actually present
What type of insulation has been installed
Whether the cavity appears fully, partially or poorly filled
Whether insulation has slumped, settled or deteriorated
Whether there are voids, gaps or cold-bridge areas
Whether debris or obstructions are present within the cavity
Whether there is evidence of moisture ingress or damp-related problems
Whether the CWI appears appropriate for the property and its exposure
Whether defects could be contributing to damp, mould or heat loss
Whether defects could be contributing to increased energy costs
Whether further investigation, remediation or extraction may be considered

You can't properly assess CWI just by looking at the outside of a house.

A CIS looks at what is actually happening inside the cavity.

Your EPC may include useful information about your property's recorded wall construction and insulation — but an EPC is an energy assessment, not a specialist cavity wall condition inspection. This page explains what your EPC can and cannot tell you about your cavity wall insulation.

21/08/2026

Get a CWI risk check to identify potential workplace risks, understand key safety considerations and take practical steps to manage them effectively.