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Extension Builders in Hertfordshire

Browse trusted local Extension Builders in Hertfordshire 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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  • Extension Specialists in St. Albans. Covering St. Albans and surrounding areas

    Oliver Building Services Ltd provides house extensions and bungalow extensions in St Albans, helping homeowners in and around the local area make...

    36 reviews / 4.97 out of 5

    We are delighted with our new kitchen. Oliver and his team are true professionals and did a brilliant job of fitting it. They were friendly,...

    St. Albans
    Hertfordshire
    AL1 5GW

  • Extension Specialists in St Albans. 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...

    117 reviews / 4.92 out of 5

    Having now used Beswick Building for two projects (inevitable when dealing with a Victorian property), I have found the team are always polite and...

    St Albans
    Hertfordshire
    AL1 1SF

  • Extension Specialists in St. Albans. Covering all areas of Herts and London.

    ADS Contracts is a well established, trustworthy, reliable and professional company with over 30 year's experience. Based in St. Albans, (Herts),...

    30 reviews / 4.54 out of 5

    Very experienced team of professionals. Dave and his team have done various jobs for me over the last few years and they have all been completed...

    St. Albans
    Hertfordshire
    AL2 1DP

  • Extension Specialists in Waltham Cross. Covering Herts, Essex and North London.

    GP Property Services has over 25 years experience in offering a wide range of building services from extensions, renovations and loft conversions...

    31 reviews / 4.99 out of 5

    Gary and Paul have just completed a downstairs rear extension, side upstairs extension and full redecoration including new windows throughout on...

    Waltham Cross
    Herts
    EN7 6DR

  • Extension Specialists in Borehamwood. Covering London and Hertfordshire 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...

    77 reviews / 4.86 out of 5

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

    Borehamwood
    Herts
    WD6 2JD

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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 Ware. Covering Herts . London . Essex . Cambs . Beds .

    About UsReid James is a family-run building and construction company based in Ware, Hertfordshire, serving London, Essex, Cambridge and...

    108 reviews / 4.82 out of 5

    A lovely job carried out by Stuart and his team. Complete refurbishment of our shower room/cloakroom. Work completed to a high standard by all...

    Ware
    Herts
    SG11 1BQ

  • 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 Herts, Middx, and all areas of North and North West London.

    RAS Construction & Design Ltd is a well established company specialising in all aspects of extensions, loft conversions, general building,...

    39 reviews / 4.95 out of 5

    RAS did a superb job for us. They carried out an extensive top-to-bottom refurbishment of our double-fronted Edwardian house. This included an...

    London
    Hertfordshire
    NW7 0AN

  • 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 North London, North West London and all surrounding areas.

    Chelebi Builders is a Build & Design construction company based in North London. Our expertise range from Loft Conversions, Extensions, House...

    31 reviews / 4.96 out of 5

    Chelebi carried out a side and rear extension on our Victorian semi detached. Cafer and his team pulled out all stops to ensure works were...

    London
    Greater London
    N12 0DR
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Other services relating to Extension Builders in Hertfordshire

Our average rating for Extension Builders

5.0 - 5.0 out of 5 from 2571 reviews

  • Level Up London Ltd, Romford

    4 out of 5.0

    "Andrew and Peter were great. They understood what we wanted, worked quickly and efficiently, and answered the hundreds of..."

    Tilda Stephens on 6th October 2026

  • 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

  • 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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