G.A.S General Building Services Ltd
Skills
- Cavity Wall Insulation
- Cavity Wall Insulation Removal
- External Solid Wall Insulation
- Flat Roof Insulation
- Internal Solid Wall Insulation
- Loft Insulation
- Roof Joist Insulation
- Roof Rafter Insulation
Featured projects
Customer Reviews
Write a review10 /10
Based on 8 reviews over the past 12 months
Quality of work
10
Reliability
10
Communication
10
Reviews (8)
10 Insulation
Posted 3 days ago
A thorough survey with clear conslusions
George came to survey the ventilation in our flat provided by the MVHR unit. He was extremely thorough and very clear in his explanation of the various technical matters. He was able to reach very useful conclusions and make recommendations for further action. His written report was prepared in a few days and sets out the whole process in great detail together with all the measurements, thermal images etc. and recommendations. This report has proved useful in making progress towards a solution to our problem of temperature control during hot weather. He was punctual, polite and friendly.Verified reviewerJob location: SE110 Loft Insulation
Posted 22 July
consultation full house insulation + sound insulation
RetrofitIQ did a great blower door test, thermal camera survey, air leakage investigation, smoke testing, etc consult for our house and provided a write up with pictures and weighted options to improve the house. It took around 4 hours and helped us find a lot of root causes of issues around the house.Verified reviewerJob location: SM1RZi-Tong D10 External Solid Wall Insulation
Posted 18 July
Quality survey and service.
George carried out a comprehensive building performance investigation at our property.The inspection included blower door testing, professional FLIR thermal imaging,smoke tracing,air leakage testing and a detailed assessment of the building fabric.He was extremely thorough,methodical and took the time to explain every issue and the reasons behind it.His approach was based on finding the root cause rather than offering quick fixes,and his knowledge and professionalism really stood out.I would not hesitate to recommend Retrofit IQ to anyone looking for a genuine building performance specialist.Verified reviewerJob location: NW410 Insulation
Posted 13 June
Excellent service from start to finish.
Highly recommended. George was very friendly, professional, and knowledgeable. He carried out a blower door test, smoke testing, and thermal imaging survey and provided a detailed report explaining the causes of our heat loss issues. Everything was explained clearly, and the recommendations were practical and easy to understand. Excellent service from start to finish. ⭐⭐⭐⭐⭐Verified reviewerJob location: LU410 Sound Proofing
Posted 07 June
Excellent Service. Highly recommended.
The work was done to perfection. We were always kept informed of what was happening and given advice of the best cost effective option. Anyone who choses this company will not be disappointed. They are extremely professional and good value for money. We will be using them again to do some more work. Thank you GAS.Verified reviewerJob location: N1710 Suspended Floor Insulation
Posted 05 April
Underfloor insulation
George was brilliant. We required the existing floor to be lifted and insulation installed. Throughout the process George was tidy, considerate and offered advice on how to achieve the best outcome. The team documented the process throughly with photos for my records. I would definitely use GAS again for similar works or general construction in our home.Verified reviewerJob location: E17RLuke L
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Company Info
Owner
Mr George Razvan Sora
Ltd Company
Member since 2026
VAT Registered
No
G.A.S General Building Services Ltd specialises in diagnosing and solving building performance problems such as heat loss, condensation, damp, mould, draughts, and sound transmission issues in residential properties.
Using professional diagnostic tools, including thermal imaging inspection, blower door air leakage testing, humidity assessment, and building performance analysis, we identify insulation defects, hidden air leakage paths, cold bridges, and acoustic weak points within the building envelope.
Our work follows building performance and Passive House design principles to ensure effective and long-term solutions. Where improvement works are required, installations such as insulation upgrades, acoustic floor systems, or airtightness improvements can be verified with before-and-after testing.
With over 15 years’ experience working with high-performance insulation, acoustic upgrades, and building envelope systems, our goal is to improve comfort, reduce heat loss, minimise unwanted noise transfer, and resolve the root cause of building performance problems.
This trade passed up to 12 Checkatrade vetting checks
Member since February 2026
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