Condensation & Moisture Control Specialists
Condensation is the most common form of damp in modern homes — and the one most often misdiagnosed. Proofterior finds why moist air is building up in your property and fixes it at the source with the right ventilation and insulation, backed by our 25-year insured guarantee.
- 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
Control the moisture and the mould has nowhere to grow
Everyday living puts litres of moisture into the air — cooking, washing, drying clothes and even breathing. In a well-ventilated home that moisture escapes. In a sealed, under-ventilated one it settles on the coldest surfaces, streams down the windows and feeds black mould.
Condensation is regularly mistaken for rising or penetrating damp, which is why so many homes get the wrong treatment. Getting the diagnosis right is what separates a lasting fix from a problem that keeps coming back every winter.
Following PCA guidance, we assess how your home holds and sheds moisture, then put in the right balance of ventilation, extraction and insulation — quiet, low-cost systems that keep humidity under control all year round.
The condensation problems we treat
Excess moisture and poor air movement are almost always the cause. Our survey confirms exactly what is driving it before any work is quoted.
Surface condensation
Warm, moist air meeting cold walls, windows and ceilings forms water droplets that soak into surfaces and feed mould. The fix is the right balance of heating, insulation and ventilation.
Cold-spot condensation
Where walls are poorly insulated, cold patches form where condensation and mould take hold first — often behind furniture on outside walls. Targeted insulation raises the surface temperature.
Whole-home humidity
Stuffy, humid air with lingering musty smells signals a home that cannot shed moisture. Positive Input Ventilation (PIV) gently refreshes the whole property and keeps humidity down.
Poor extraction & air movement
Kitchens and bathrooms without effective extraction pump moist air into the rest of the home, where it condenses on cold surfaces and causes damp elsewhere.
Real condensation & ventilation projects across the South
Every job below is a genuine Proofterior project across Dorset, Hampshire and Wiltshire — diagnosed properly, treated at the source and finished to a healthy, lasting standard. Click any project to see the before, after and exactly how we put it right.
The warning signs to look for
If you recognise any of these in your home, it is worth having it assessed before the moisture starts feeding mould.
Book a complimentary survey- Streaming condensation on windows, especially in the mornings
- Black mould in corners, on ceilings and around window reveals
- A stuffy, humid or musty feeling in one or more rooms
- Mould appearing behind wardrobes and furniture on outside walls
- Steam lingering long after cooking, bathing or drying clothes
- Water pooling on window sills and cold surfaces
- Peeling wallpaper or blistering, discoloured paint
- Damp, cold-feeling walls that never seem to warm up
Our condensation & moisture solutions
Our work across Dorset, Hampshire & Wiltshire
Real photos from recent Proofterior projects — every job surveyed, treated and finished by our own in-house team.
From first call to lasting protection
Complimentary survey
We assess your property to identify the sources of excess moisture and where it is settling.
Expert diagnosis
Our surveyor explains the causes and recommends the right ventilation or insulation solution.
Specialist treatment
We install the chosen system with minimal disruption to your home.
25-year guarantee
Every installation is backed by our 25-year insured guarantee.
How we put it right
Once the cause is confirmed, we address both the moisture in the air and the cold surfaces it settles on — never one without the other.
Positive Input Ventilation (PIV)
A quiet, low-cost whole-home unit introduces fresh, filtered air to keep humidity down and stop condensation forming — one of the most effective long-term defences against condensation and mould.
Extraction & ventilation upgrades
Correctly specified extraction in kitchens and bathrooms removes moisture at source, so damp air never settles on cold walls and ceilings elsewhere in the home.
IsoTherm internal insulation
Targeted internal wall insulation raises the temperature of cold surfaces so condensation — and the mould it feeds — can no longer take hold.
Anti-microbial mould treatment
Where condensation has already caused mould, affected areas are treated with specialist anti-microbial products as part of resolving the moisture problem behind it.
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.
Covering Dorset, Hampshire & Wiltshire
Local knowledge, specialist expertise and lasting protection for the home you care about.
Everything you might be wondering
Condensation typically appears on cold surfaces, windows and in poorly ventilated areas, often with black mould, whereas rising and penetrating damp come from moisture entering the structure. They need completely different treatments, which is why our survey confirms the cause first.
Where humidity and poor ventilation are the cause, Positive Input Ventilation is one of the most effective and economical fixes. It is quiet, low-cost to run and keeps moisture under control across the whole home — but we only recommend it when your survey shows it will genuinely solve the problem.
The condensation itself is a symptom, but the black mould it feeds can trigger and worsen asthma, allergies and other respiratory problems — particularly for children, older people and anyone with an existing condition. Controlling the moisture protects both your home and your family.
Most ventilation and insulation work is completed in a day or two with minimal mess. We protect your home throughout and clear up fully on completion.
Yes. Our surveyors are ISSE accredited, we are registered for environmental waste carriage, and we hold strong independent ratings across Checkatrade, Google and Yell.
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.