Rising Damp Treatment in Portsmouth & Southsea
Portsea Island is flat, low-lying and packed with Victorian terraces — exactly the conditions where old damp proof courses give up. Proofterior prove whether it really is rising damp, then install a new DPC and replaster with salt-resistant materials, backed by a 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
Areas we cover near Portsmouth
Our specialists regularly work throughout Portsmouth and the surrounding neighbourhoods.
Why rising damp is so common in Portsmouth
Most of the city sits only a few metres above sea level, on ground that stays wet for much of the year.
Island water table
On Portsea Island the groundwater is close to the surface, so the base of every wall is in damp ground and any weakness in the DPC shows quickly.
Street after street of terraces
Terraces in Fratton, Southsea, Copnor and North End were built around 1880–1914, many with slate DPCs that have now cracked or been bridged.
Raised pavements and yards
Pavements, rear yards and concrete paths laid over the years often sit above the original DPC, letting moisture straight past it.
How we treat rising damp in Portsmouth
1. Prove the cause
Moisture profiles, salt analysis and a check of outside ground levels confirm genuine rising damp — and rule out leaking downpipes, condensation or a bridged cavity.
2. Install a new DPC
A chemical damp proof course injected into the mortar bed, with our Proofterior Dry System (PDS) membrane where walls are badly salt-loaded.
3. Replaster for the long term
Contaminated plaster comes off back to brick, and a salt-resistant renovating plaster goes on, ready for decoration.
Services we provide in Portsmouth
Every service is delivered by our own in-house team and backed by our 25-year guarantee.
Your local damp, mould & timber team in Portsmouth
In a Portsmouth terrace, the cheapest fix is sometimes the right one: lowering a back yard or clearing a blocked air brick can stop damp that someone else would quote a full DPC for. We check those things first, follow Property Care Association guidance, and give you a written report with photos and readings. We cover the whole city and Portsea Island, plus Hilsea, Drayton, Farlington and across to Gosport and Havant.
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.
Recent projects near Portsmouth
Real photos from Proofterior jobs in and around the area — surveyed, treated and finished by our own in-house team.
Covering Dorset, Hampshire & Wiltshire
Local knowledge, specialist expertise and lasting protection for the home you care about.
Everything you might be wondering
Rising damp stays low on the wall, leaves a tide mark and salts, and is there all year. Condensation appears on cold surfaces, around windows and in corners, and is worse in winter. Many Portsmouth terraces have both, which is why we measure before recommending anything.
Yes. We can inject a DPC from your side of a party wall. Where the damp is coming from next door, our report explains what we found so you can discuss it with your neighbour.
A typical ground-floor room in a Portsmouth terrace takes two to four days, including the new DPC and replastering. Your report gives you a clear timeline.
Yes. We cover all of Portsmouth, including Southsea, Fratton, Milton, Eastney, Copnor, North End, Cosham and Drayton.
No. Your initial property survey is completely complimentary and carried out with no obligation. A specialist visits your property, carries out a thorough assessment, and gives you clear, honest recommendations in plain English.
As a local, in-house team we are usually able to arrange a survey visit within a few days. Call us on 01202 287503 and we will book a time that suits you.
Get clear, honest answers about your home in Portsmouth
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.