Row of red-brick houses with white windows and doors

Diagnostic survey

Cavity wall borescope survey

A camera check that shows whether your cavity walls are empty, filled or failed.

Book online

£95–£195

Your fee is set by the size and type of your home, shown before you confirm.

Credited against your installation if you go ahead within 90 days.

Choose a date Or call 020 8914 7824

What you get

What's included

Small inspection holes drilled in the mortar
Borescope camera inspection of the cavity
Holes made good afterwards
Findings and recommended next step

Who it's for

Homes where you're not sure if the cavities were filled
Damp or cold walls after an old cavity fill
Before cavity wall insulation or extraction

The visit

We need access around the outside walls. The inspection holes are small and made good before we leave.

What happens next

From booking to report

Step 1
Pick your survey
Choose the survey that fits — or start with a heat loss survey if you're planning a heat pump.
Step 2
Tell us the size
Property type and size set the fee, within the published range.
Step 3
Choose a date
Pick a two-hour arrival window from the live calendar.
Step 4
Confirm
Your slot is confirmed straight away. Pay on the day or by invoice — no payment taken now.
Step 5
Surveyor visits
Measurements and photos of every room, with reminders the day before and on the day.
Step 6
Report and proposal
Your written report, and a proposal if you'd like one.

Book this survey

Questions

About the cavity wall borescope survey

What if the cavity insulation has failed?

We'll explain the options, which may include cavity extraction and refill. Prices are on our insulation pages.

Is the fee credited?

If you go ahead with the work through LINX within 90 days, the survey fee is credited against your installation. If you don't, you still keep the report.