Damp Flagged in a Home Buyer Survey on Prince George’s Avenue, Raynes Park SW20
A Level 3 home buyer survey had raised concerns about damp at a mid terrace Victorian house on Prince George’s Avenue in Raynes Park. Advanced Damp were asked to find the cause.
Project at a Glance
The Brief
The concern came from a Level 3 survey, and the owners wanted a clear diagnosis and plan.
The Survey
The main area of concern was the front reception room, where readings, salt contamination and failing decoration were recorded low on the bay window wall. The pattern pointed to moisture from high external ground, poor sub floor ventilation and long term saturation at the base of the wall.
Outside, a blocked storm drain sat next to the bay, ground levels were raised and the air bricks were at ground level. The rendered plinth was cracked and appeared to bridge or hide the original DPC, letting moisture bypass it.
The Solution
The work covered:
- Air brick work to restore sub floor ventilation.
- Render and set to the affected bay wall.
- Isotherm insulation to raise surface temperatures.
- Electrical work for improved ventilation.
The Work
Advanced Damp carried out the work from 17 to 19 August 2026.
The Result
The owners had a clear explanation of the damp the home buyer survey flagged and a fix aimed at the causes. See our page on damp proofing in Wimbledon.
Frequently Asked Questions
My home buyer survey mentions damp. What next?
A specialist damp survey identifies the actual cause and what work is needed, so you can make decisions with the facts.
Why do air bricks at ground level cause problems?
They let water in and restrict airflow under the floor, which keeps the base of the wall and the timbers damp.
What does a cracked render plinth do?
It can trap water and bridge the damp proof course, letting moisture into the wall above it.
Damp flagged in a survey?
Our CSSW and CSRT trained surveyors find the real cause before recommending any work. Non-invasive survey with a clear written report. No obligation.
Survey carried out by Lionel Sewell (FODCS) at Advanced Damp. Project completed in Raynes Park, SW20.
Sam Fitzgerald is the founder of Advanced Damp and a working damp and structural waterproofing surveyor diagnosing and treating moisture problems in residential and commercial properties across London and the South East. He is FODCS certified (a Federation of Damp Certified Surveyor) and a member of the Federation of Damp. His hands-on work covers rising damp, penetrating damp, condensation, basement waterproofing to BS 8102, and thermal imaging surveys, and he has personally completed over 400 damp surveys across properties of every type and age. Everything he writes draws directly from jobs he has carried out. He does not write about treatments, products or causes he has not dealt with first-hand in the field.
