Cavity Wall Insulation Survey & Borescope Inspection
You cannot fix a cavity wall problem you cannot see. A Proofterior cavity wall insulation survey puts a camera inside your wall to show exactly what is there, whether it is wet, slumped or bridged, and whether it is causing your damp. Carried out by ISSE accredited surveyors across Dorset, Hampshire and Wiltshire, with a clear written report.
- ISSE accredited
- 25-year insured guarantee
- In-house specialist team
Book your complimentary survey
Tell us what is happening and a specialist will find the real cause and give you a fixed price to fix it. No obligation.
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Genuine reviews from local homeowners
Over 200 verified reviews across Checkatrade, Google and Yell
“Excellent service from start to finish. The survey was thorough and professional, with honest, evidence-based advice rather than trying to sell unnecessary work. I came away with complete peace of mind.”
Alex Richards-Taylor
Google review
“Excellent service throughout. Ashton came out to look at an issue raised on a part-exchange survey and, rather than recommend expensive remediation, told me honestly there was nothing wrong with the wall. Great to have an honest discussion.”
Ian M.
BH16 · Damp Investigation
“Dylan and the Proofterior team were amazing. The report was incredibly comprehensive. Can’t recommend them enough.”
Sam Short
Google review
“Very pleased with the work on our living room and bedroom walls. Punctual, polite and friendly, and completed on time even though it was Easter week. Many thanks to everyone at Proofterior.”
Chris G.
BH20 · Penetrating Damp Treatment
“Dan was very thorough, professional and polite. Quick to respond and I would highly recommend.”
Malik R.
Yell · Quick & Professional
“The workmen were clean, pleasant and efficient and took just one day. The very next day we noticed a big difference with the damp issue. Many thanks.”
Nick Bennett
Google review
“Able to fit my job in for the next day and completed in a day as agreed. Not the lowest quote, but it comes with a 25-year guarantee, which I wanted — long-term peace of mind was vital.”
Alan M.
BH23 · Flat Roof Reseal
“Ashton was so friendly and informative. I’ve gone from worried to empowered — someone you can trust to do the right thing.”
Suzanna Furbank
Google review
“Really amazing service. Dan provided a really thorough damp investigation and a very helpful damp report. Very quick responses too.”
Paul A.
Yell · Damp Investigation
“Happy with the speed — a full flat survey within a week. They explained our options, the price was extremely competitive, and our tenants are pleased with their fresher, safer flat.”
Verified Customer
SP6 · Damp Proofer
“Dan provided a very professional service from start to finish. Very good communication and a first-class job.”
Mark H.
Yell · Professional Service
“Excellent service from start to finish. The survey was thorough and professional, with honest, evidence-based advice rather than trying to sell unnecessary work. I came away with complete peace of mind.”
Alex Richards-Taylor
Google review
“Excellent service throughout. Ashton came out to look at an issue raised on a part-exchange survey and, rather than recommend expensive remediation, told me honestly there was nothing wrong with the wall. Great to have an honest discussion.”
Ian M.
BH16 · Damp Investigation
“Dylan and the Proofterior team were amazing. The report was incredibly comprehensive. Can’t recommend them enough.”
Sam Short
Google review
“Very pleased with the work on our living room and bedroom walls. Punctual, polite and friendly, and completed on time even though it was Easter week. Many thanks to everyone at Proofterior.”
Chris G.
BH20 · Penetrating Damp Treatment
“Dan was very thorough, professional and polite. Quick to respond and I would highly recommend.”
Malik R.
Yell · Quick & Professional
“The workmen were clean, pleasant and efficient and took just one day. The very next day we noticed a big difference with the damp issue. Many thanks.”
Nick Bennett
Google review
“Able to fit my job in for the next day and completed in a day as agreed. Not the lowest quote, but it comes with a 25-year guarantee, which I wanted — long-term peace of mind was vital.”
Alan M.
BH23 · Flat Roof Reseal
“Ashton was so friendly and informative. I’ve gone from worried to empowered — someone you can trust to do the right thing.”
Suzanna Furbank
Google review
“Really amazing service. Dan provided a really thorough damp investigation and a very helpful damp report. Very quick responses too.”
Paul A.
Yell · Damp Investigation
“Happy with the speed — a full flat survey within a week. They explained our options, the price was extremely competitive, and our tenants are pleased with their fresher, safer flat.”
Verified Customer
SP6 · Damp Proofer
“Dan provided a very professional service from start to finish. Very good communication and a first-class job.”
Mark H.
Yell · Professional Service
What is Cavity Wall Insulation Survey & Borescope Inspection?
A cavity wall survey (or CWI survey) is a specialist inspection of the insulation and the cavity it sits in. We drill small holes at the mortar joints and insert a borescope — a thin camera on a flexible probe — to film inside the cavity. That shows the type of insulation, how evenly it fills the wall, whether it is wet, and whether debris, mortar droppings or rubble are bridging the gap. We combine this with moisture readings on the inner wall, thermal imaging to find cold spots, a check of humidity and ventilation, and an external inspection of pointing, render, gutters and exposure. The holes are filled with matching mortar afterwards. The result is a written report with photographs that tells you whether the insulation is the cause of your damp and what, if anything, should be done — evidence you can also use for a guarantee claim, a house sale or a lender.
The warning signs to look for
Catching the problem early keeps repairs simpler and less costly. If you notice any of these signs, it is worth booking a specialist survey before the damage spreads.
Book a complimentary survey
- Damp or mould on outside walls of an insulated home
- You are buying a house with filled cavity walls
- A homebuyer or mortgage survey mentions the cavity insulation
- You are unsure whether your cavity has ever been filled
- You want evidence for a CIGA or installer claim
- Damp keeps coming back after previous repairs
- You are planning re-insulation or external wall work
- Cracks or bulging that could point to wall tie problems
Our treatment process
Every job follows the same careful, diagnosis-first method — so you know exactly what is happening and why at each stage.
Booking: we ask about the symptoms, the age of the house and when the insulation was installed.
External check: pointing, render, gutters, downpipes, sills, weep holes and the exposure of each wall.
Borescope inspection: small holes at the mortar joints let us film inside the cavity at high and low level on each affected wall.
Internal readings: moisture meter, thermal imaging and humidity checks in the affected rooms.
Making good: inspection holes are filled with mortar to match your joints.
Written report: findings, photographs, the likely cause and clear recommendations with a fixed quote if work is needed.
Cavity Wall Insulation Survey & Borescope Inspection — from our recent projects
Real photos from Proofterior jobs across Dorset, Hampshire and Wiltshire — carried out by our own in-house team.
Included as standard
Built to impress, built to last
Diagnosis first
We identify the real cause before recommending any treatment. No guesswork, and never unnecessary work.
In-house specialist team
Vetted, Proofterior-trained specialists, managed by us from survey to completion. No compromises.
25-year guarantee
Every treatment is backed by our 25-year insured guarantee, giving you lasting protection and peace of mind.
Cavity Wall Insulation Survey & Borescope Inspection across Bournemouth, Poole & the South Coast
We carry out cavity wall insulation surveys for homeowners, buyers and landlords across Dorset, Hampshire and Wiltshire — from seafront flats and 1930s semis in Bournemouth, Poole and Southampton to post-war estates in Portsmouth, Andover and Salisbury, and rural homes around Wimborne, Ringwood and Romsey. Our team works across Bournemouth, Poole, Christchurch, Southampton, Portsmouth, Winchester, Salisbury and the towns and villages in between.
Covering Dorset, Hampshire & Wiltshire
Local knowledge, specialist expertise and lasting protection for the home you care about.
Everything you might be wondering
A borescope is a small camera on a flexible probe. Inserted through a hole at a mortar joint, it lets the surveyor see inside the cavity — the insulation type, how well it fills the wall, whether it is wet and whether debris is bridging the gap.
No. The inspection holes are small, drilled at the mortar joints rather than through bricks, and filled with matching mortar afterwards.
Usually one to two hours for a typical house, depending on how many walls need inspecting and whether damp needs tracing in several rooms.
Yes. A borescope shows straight away whether the cavity is empty or filled, and with what. Drill-hole patterns in the mortar can also be a clue from outside.
Yes. Our report records what was found, with photographs and readings, which is the kind of evidence an installer or CIGA will want to see. We are independent of the original installer.
If the house has filled cavities and any sign of damp, or the homebuyer survey recommends further investigation, a specialist cavity wall survey is a sensible step before exchange.
Get clear, honest answers about your home
A qualified specialist will visit your property, carry out a thorough inspection and give you clear recommendations in plain English — everything explained in one visit, with no obligation.