Quick answer
2 verified damp proofing specialists are based within 25 miles of Portsmouth, and 6 more cover the area from further away. The nearest is Insite (Southern) Ltd, based in Southampton — about 16 miles from Portsmouth.
Free, no obligation — your details only go to the specialists you choose.
Is it mould, condensation or something else in Portsmouth? A survey tells you which before you pay for a fix.
Southampton16 miles away
Southampton's oldest specialist remedial contractor established 1974. 45+ years' experience serving Southampton, Bournemouth, Salisbury, Andover, Portsmouth and Chichester. Services include mould issues, damp proofing, tanking, condensation control, wall tie replacement and woodworm treatment.
Southampton17 miles away
Southampton's Most Trusted Damp & Preservation Specialists No guesswork. No upselling. Just honest, survey-led damp solutions backed by a 10-year guarantee.
Covers Portsmouth · based in Bishop's Stortford, Hertfordshire90 miles away
Quoins Damp Surveyors provides independent damp and mould investigations for homeowners, buyers, landlords, letting agents and property professionals across Hertfordshire, Essex, London and surrounding areas. With extensive experience in building maintenance and remedial work, I investigate the causes of damp, mould and moisture damage and provide clear, practical advice on the next steps. Surveys include internal and external inspections, moisture readings, thermal imaging, humidity checks and an assessment of ventilation where appropriate. A written report explains the findings, likely causes and recommended remedial measures. I also offer drone roof inspections and aerial property photography to help identify visible defects in roof coverings, gutters, chimneys and other areas that are difficult to inspect from ground level, subject to suitable weather and safe flying conditions. Where required, remedial work can be quoted separately through Quoins Building Services. Damp surveys start from £300. Please contact Edmund Harrison to discuss your property and arrange an inspection.
Covers Portsmouth · based in Poole, Dorset38 miles away
Leading providers of mould removal services in Southampton and Hampshire. Long-lasting solutions for eliminating damp and mould including condensation, penetrating and rising damp. Comprehensive mould removal and treatment services for commercial and residential customers. Free quotes available.
Covers Portsmouth · based in Tadworth, Surrey46 miles away
Covers Portsmouth · based in Crawley Down, Crawley, West Sussex49 miles away
Established in 2023, our family-run property maintenance business brings over 20 years of industry experience to every job. We provide comprehensive property maintenance across London, Surrey, Kent, and Sussex. Fully insured with SafeContractor accreditation, we specialise in expert damp and mould treatments. Our four-step mould treatment process is highly effective because it targets mould at the source. We use biocidal products, which are specially formulated to kill mould spores completely and prevent regrowth, far more effective than home remedies like apple cider vinegar or shop bought products containing bleach, which may clean the surface but cannot penetrate deeply or stop mould from returning. We do more than treat visible mould. Our team is trained to identify and address the underlying cause, helping to prevent the issue from returning. As part of this process, we assess the property both internally and externally to determine whether remedial work is required. This may include: Improving ventilation systems Addressing penetrating damp Resolving DPC issues
Covers Portsmouth · based in Croydon, Greater London56 miles away
My name is "Mouldy" Paul. I have retired once, but set up this business primarily for my son, Peter. Trained by The National Flood School to adhere to IICRC regulations (only internationally recognised course) on how to remove damp and mould, in accordance to Health and Safety and COSSH. Peter has attended training by myself and attended courses on damp removal. Accredited by Safecontractor and SMAS to PAS 91 level, but the accreditation we hold with Which? is one we are most proud of. Peter does the mould removal along side my niece. My wife assists with painting and my cousin also being involved in the business, makes it truly a family affair. We have contracts with countless letting agencies, housing associations and even a museum. We ask for images to assess the cost and provide our quotation. If we are rewarded with the job, we would also carry out a free damp survey on the day of the mould remediation. An easy to read detailed report would highlight why mould exists and offer recommendations on how to prevent mould returning, all free of charge.
Covers Portsmouth · based in Halstead, SevenoakS, Kent64 miles away
Qualifications in Portsmouth: Of the 8 specialists listed, 2 are Property Care Association (PCA) members, 1 holds the CSRT (Certified Surveyor in Remedial Treatment) qualification and 6 have verified insurance.
Damp proofing is the remedial work once the cause is known: a damp-proof course injected or replaced, tanking or membranes for below-ground walls, or fixing the water source — a gutter, render or flashing — so it stops entering the wall. In Portsmouth, as elsewhere, the most common “damp” is condensation, which no damp-proof course will fix.
So ask any specialist for the survey findings in writing before agreeing a treatment, and check whether they are CSRT-qualified or PCA members.
In force for social housing in England since 27 October 2025; the private rented sector extension comes under the Renters' Rights Act 2025, with no confirmed date. Read the Awaab’s Law guide →
General questions about mould and damp → read the FAQ · About damp proofing