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G.A.S General Building Services Ltd

9.94/10

London

£1,000 guarantee T&Cs apply

Checkatrade member since February 2026

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

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Customer Reviews

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9.94 /10

Based on 12 reviews over the past 12 months

Quality of work

9.92

Reliability

9.92

Communication

10

Reviews (12)

  • 10

    Sound Proofing

    Posted 24 September

    Highly recommended

    I engaged George as an acoustic consultant for the refurbishment of a top-floor apartment where there was significant noise transfer between floors. He provided an extremely detailed specification tailored specifically to the property, including recommended products and clear, comprehensive instructions for the builders. Any questions throughout the works were answered very quickly and with great attention to detail. The finished result has delivered a vast improvement in sound insulation. The service from start to finish has been excellent and very good value for money. Highly recommended!
    Job location: E8
    Kylie G
  • 10

    Sound Proofing

    Posted 17 September

    Excellent service and value for money

    I engaged George as an acoustic consultant for a top floor apartment I am renovating in Hackney, London. The job involved installing new floors so I wanted to take the opportunity to get the acoustic insulation just right. George's help was so valuable to the project. He provided an extremely detailed acoustic solution customised to my apartment, which included a full product specification and detailed instructions for the installers to ensure the best results. George has been on hand throughout the project to answer any of my questions, and his responses are always prompt and very detailed.
    Verified reviewerJob location: E8
    Kylie G
  • 9.33

    Insulation

    Posted 02 September

    Excellent professional work

    George and his partner spent the day conducting smoke detection, investigations, sealing and remediation works. They worked diligently and provided helpful explanations and context throughout. They couldn’t have accomplished more and were concerned with follow-on monitoring too. I would definitely use George’s company again for any repair or improvement works in my flat and would recommend them based on expertise, quality, care and value for money.
    Verified reviewerJob location: W9
  • 10

    Insulation

    Posted 19 August

    Insulation installation

    I got three companies to quote to install new insulation my recently bought house. George stood out amongst those from the moment he came - he was clear, honest and clearly understood our needs, taking the time to listen carefully. He was incredibly thorough from the start, taking time and care to take photos and thermal measurements etc, which he wrote up in to a thorough and clearly thought out quote and report. He then went on to do a perfect job - tidy, professional, clean and professional. I thoroughly recommend him.
    Verified reviewerJob location: E7
  • 10

    Insulation

    Posted 31 July

    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: SE1
  • 10

    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: SM1
    Zi-Tong D

Photos

Company Info

Owner

Mr George Razvan Sora

Ltd Company

Member since 2026

VAT Registered

No

Domestic WorkCommercial WorkFree EstimatesCards Accepted

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.

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Member since February 2026

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