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Extension Builders in London

Browse trusted local Extension Builders in London on TrustATrader, all vetted, with photos of completed work, and reviews from previous customers.

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Local Extension Builders

We have found a selection of the best, most reliable Extension Builders in your area. You can click on a trader profile to find out more information, send email/SMS enquiry, or add them to your call back list.

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    TrustATrader Guarantee for extra peace of mind. TrustATrader Guarantee easily covers your next job via TrustATrader to provide extra peace of mind. Click this icon within the listing to register your TrustATrader Guarantee. Find out more

  • Extension Specialists in London. Covering North London, North West London, Central London and all surrounding areas.

    In an unstable market house extensions are often the most viable option, helping you to get the most out of the space you have without the...

    60 reviews / 4.94 out of 5

    Bright Builders are an amazing team of friendly, responsible and professional builders. Ervin is a great person to work with; understanding,...

    London
    N20 0HD

  • Extension Specialists in London. Covering Chelsea, Kensington, Mayfair & Soho

    LINX Design And Build is a family-run business with intensive experience in the building and construction industry. We have been helping customers...

    198 reviews / 4.97 out of 5

    Happy my family with the work done on the roof, kitchen, bathroom and addition to our property. The group was amiable, dependable, and incredibly...

    London
    SW3 5EX

  • Extension Specialists in London. Covering Greater London

    Den Builders LtdInnovative. Reliable. Family-Run Construction Experts.Based in Greater London, Den Builders Ltd is a trusted, family-run...

    9 reviews / 5.0 out of 5

    We had a great experience with Denbuilders! Den built our home extension and managed the entire project from start to finish. He was professional,...

    London
    SE9 1PF

  • Extension Specialists in London. Covering all surrounding areas

    Art & Build Ltd is a Croydon-based construction company specialising equally in three core areas: loft conversions, house extensions and full...

    7 reviews / 5.0 out of 5

    Project was expertly managed from start to finish. Delighted with the results and had lots of constructive input from Art & Build along the way

    London
    W12 7BQ

  • Extension Specialists in London. Covering all surrounding areas

    In an unstable market house extensions are often the most viable option, helping you to get the most out of the space you have without the...

    14 reviews / 4.96 out of 5

    Pure Contractors exceeded all our expectations on every level. From the initial consultation right through to the end result. Everyone we dealt...

    London
    SW11 1AA

  • Don't forget! to mention TrustATrader. Please mention TrustATrader when you contact any of our trusted traders.

    TrustATrader Guarantee for extra peace of mind. TrustATrader Guarantee easily covers your next job via TrustATrader to provide extra peace of mind. Click this icon within the listing to register your TrustATrader Guarantee. Find out more

  • Extension Specialists in London.

    Level Up London Ltd provides home extension specialists across London, helping homeowners create more space without the stress of moving. With...

    10 reviews / 5.0 out of 5

    Have worked with Peter at Level Up for some years now on a range of projects. Always a great experience and highly recommended.

    London
    E4 9BX

  • Extension Specialists in London. Covering Throughout London

    About Us21st Century Design & Build Ltd is a London-based design and build specialist offering high-quality house and bungalow extensions across...

    26 reviews / 4.96 out of 5

    I was very satisfied with the work carried out by Thomas and his team to recently install 3 windows in my property. The job was completed within a...

    London
    SE4 1JD

  • Extension Specialists in London. Covering all surrounding areas within a twenty mile radius

    Welcome to Prime Construction Services LtdWe are builders based in London that have been successfully completing work in the area for many...

    17 reviews / 4.93 out of 5

    One of the few contractors out there who were honest, patient with our indecisiveness and flexible in their approach with us. Prime Construction...

    London
    N12 9LY

  • Extension Specialists in London. Covering London, North London, Hertfordshire

    In an unstable market house extensions are often the most viable option, helping you to get the most out of the space you have without the...

    9 reviews / 4.98 out of 5

    We recently used C Shambi Builders for a loft conversion and extension, having previously used them for other work, and once again we couldn’t be...

    London
    NW3 4DB

  • Extension Specialists in London. Covering Greater London

    In an unstable market house extensions are often the most viable option, helping you to get the most out of the space you have without the...

    69 reviews / 5.0 out of 5

    We've renovated before and know how difficult it can be to find reliable builders. Nova restored our faith. The team genuinely cared about doing...

    London
    EC2A 4NJ
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Other services relating to Extension Builders in London

Our average rating for Extension Builders

5.0 - 5.0 out of 5 from 2719 reviews

  • Lukpol Building Services Ltd, Borehamwood

    5 out of 5.0

    "I got a couple of quotes but went with Lucasz because he sounded experienced. I thought my job was complicated as it..."

    Rosemary Carney on 4th October 2026

  • DSL Brickwork Ltd, Rayleigh

    5 out of 5.0

    "Have used DSL before - they would always be my go to for any building work big or small."

    Robert Murphy on 2nd October 2026

  • LD & C Homes Ltd, Sidcup

    5 out of 5.0

    "Really pleased with the garden room LD&C Homes Ltd built for us. We wanted a proper space to use as a home office and..."

    Connor Nelson on 1st October 2026

  • 21st Century Design & Build Ltd, London

    5 out of 5.0

    "I was very satisfied with the work carried out by Thomas and his team to recently install 3 windows in my property. The..."

    Howard Davis on 1st October 2026

  • R&J Building Services Shefford Limited, Henlow

    4 out of 5.0

    "Amazing service from start to finish for our garage conversion very happy with the finished job. Always on time and..."

    Daniel Robinson on 28th September 2026

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