Damp problems
Condensation and black mould assessment
Practical condensation and black mould assessment with honest ventilation advice and cause-led remediation.
Why diagnosis matters
Treat the cause, then repair the damage
Mould is rarely solved by cleaning or painting alone. We consider moisture production, cold surfaces, heating, airflow, insulation and building defects without automatically blaming the people living in the property.
Complimentary survey
Book Your Complimentary Survey
Over 35 years of independent expertise. Written findings included. No sales pressure. No obligation.
Book your complimentary surveyTechnical review
Dan, Director / Surveyor
Last reviewed: July 2026. Advice is general until the property, access and visible evidence have been assessed.
Guarantee & aftercare
Written guarantee terms are matched to qualifying work, with inclusions, exclusions and aftercare explained before acceptance.
What we consider
Possible causes and lookalikes
High indoor humidity meeting cold surfaces
Restricted airflow or underperforming extract
Thermal bridges and insulation gaps
Leaks or penetrating damp mistaken for condensation
Inspection method
A clear work sequence
Step 1
Discuss timing, rooms and occupancy patterns
Step 2
Review visible mould and cold-surface patterns
Step 3
Consider ventilation routes and building defects
Step 4
Specify cleaning, repair and ventilation measures proportionately
Scope boundaries
Honest about what the work does—and does not—cover
We do not provide medical diagnosis. Electrical connections and whole-house ventilation design are undertaken only by appropriately competent specialists.
Complimentary specialist survey
Your Complimentary Specialist Survey
Backed by over 35 years of independent damp and timber expertise.
We believe in diagnosis before treatment. That's why we offer every homeowner and property manager in Dorset, Hampshire and Wiltshire a complimentary specialist survey — carried out by an experienced specialist, not a salesperson.
Over 400 combined reviews across Google and Checkatrade. Over 35 years protecting Dorset homes.
Common questions
About condensation and black mould assessment
Why does mould return after cleaning?+
Cleaning removes visible growth but not the moisture conditions that allowed it. Humidity, cold surfaces, weak extract and defects must be considered together.
Can PIV solve every mould problem?+
No. PIV can help suitable properties, but it is not a substitute for repairing leaks, improving extract or addressing major heat-loss issues.
Is the occupant always responsible?+
No. Moisture production is only one factor. Building defects, heating, insulation and ventilation provision also matter, particularly in rented homes.
Is the specialist survey really free?+
Yes — completely. We offer every homeowner and property manager across Dorset, Hampshire and Wiltshire a complimentary specialist survey at no charge. This includes an on-site inspection, written findings, a clear scope of any recommended work, and an honest referral if the problem falls outside what we do. You pay nothing for the survey. You only pay if you commission the remedial work, and you are under no obligation to do so. The reason we do this is straightforward: we believe in diagnosing the problem before recommending a treatment. A proper inspection takes time, and we'd rather invest that time up front than quote a solution before we've understood the cause.
Not sure if this is your problem?
That's exactly what the survey is for. Book your complimentary specialist survey and one of our experienced team will identify the cause on-site, consider the alternatives, and give you written findings — at no charge and with no obligation.
Related services
Continue your investigation
Recent work
Photographed on our own projects
A selection of real jobs from this service, photographed on site across Dorset, Hampshire and Wiltshire.
Reviewed by local homeowners
Trusted across Dorset, Hampshire and Wiltshire
Independent feedback from customers on Google and Checkatrade — alongside over 35 years of damp proofing and plastering experience.
Next step
Claim your complimentary survey before choosing a treatment
Tell us what you can see, when it changes and where the property is. Photographs can help us triage the next step.