JNA Developments (London) Limited Logo

JNA Developments (London) Limited

  • Builder
  • Carpenter
  • Painter / Decorator
  • Plumber
  • Shop Fitting

Burgh Heath, Tadworth, Surrey

+Approved member since 2008
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Services and skills

  • Builder

    33 skills

    Agricultural Building

    Basement / Cellar Conversions

    Brick / Concrete Structural Repairs



    Core Drilling


    Diamond Drilling

    Emergency Builder Service

    Equestrian Stable

    Extensions / Conversions

    Fire and Flood Renovation


    Garage Conversions

    Garden Studios

    General Building

    Green Oak Framing

    Heritage Property Specialist

    Insurance Claim Specialist

    Loft Conversions

    New Builds

    Partition Walls

    Period Property Restoration

    Project Management


    Repair and Listed Building Specialist

    Steel Fabrication

    Steel Work Design

    Structural Design

    Structural Steels

    Sustainable Construction

    Tree Houses

    Workshop Design / Construction

  • Carpenter

    1 skill


  • Painter / Decorator

    1 skill

    Painting / Decorating

  • Plumber

    4 skills

    Water Mains Specialist (Pipe Replacement, Moling and Lead Pipes)

    Bathroom & Kitchen Plumbing

    General Plumbing

    Plumbing Repairs

  • Shop Fitting

  • Services

    3 services

    • Domestic Work
    • Commercial Work
    • Free Estimates


Customer reviews

Overall ratingin last 12 months

9.83Write a review
  • Workmanship9.83 out of 10
  • Tidiness9.83 out of 10
  • Reliability9.83 out of 10
  • Courtesy9.83 out of 10
  • Quote Accuracy100 out of 100
Write a review

83 Total Reviews

The reviews below represent customers' views and not the views of Checkatrade

  • Loft Conversion

    10Verified Review

    Justin and the team were fantastic, very professional and timely. We had a loft conversion, including new roof and tiles. The results are brilliant. The team are trustworthy and all was completed as quoted. Good company to use for the whole package from architect, structural engineer, planning application to completed build.

    Location: SM7
  • Wraparound extension

    10Verified Review

    We are very pleased with the wrap-around extension including a much bigger kitchen and dining area which Justin and his team have built for us. One of the first things Justin explained to us was that he could ensure we had a working kitchen for as long as possible. This made such a big difference to us as we were living on-site during the build. He also showed us other high quality jobs which he and his team had created - very helpful. Always very professional, efficient, and very likeable - it was a real pleasure to have them on site and they always cleared up at the end of the day.

    Location: SM7
  • Loft Conversion

    10Verified Review

    Justin and his team have done an amazing job on our loft conversion. They are all very professional, hardworking, friendly, polite and punctual and always tidied up at the end of the day. Nothing was ever too much trouble, even with last minute alterations to our original plans, Justin and his team were always very accommodating. Our loft has been done to an extremely high standard and I highly recommend them.

    Location: KT17
  • Kitchen extension, utility room build, internal works

    10Verified Review

    This is the 2nd time that I have used JNA (previous was for a garage conversion back in 2021) and I am as happy with their work this time around as I was the last. The works were considerably more this time; back extension, kitchen installation, utility room build and fit out and various other internal works. All works completed to a very high standard and we are thrilled with the results. I wouldn’t hesitate to recommend JNA.

    Location: KT20
  • Kitchen remodel and removal of internal pier including installation of structural steel support


    Faultless work good quality work great attention to detail and a pleasure to work with.

    Location: SM1
  • Building a large garden cabin with hot tub terrace


    Justin and his team have taken on several projects for us now, and each one has been an absolute pleasure to be part of. They are all highly skilled and take the greatest care. On top of that they are a very friendly team, always open to ideas and willing to evolve the design as it progresses. I have every confidence in them and couldn't recommend them highly enough.

    Location: KT6
Read all 83 reviews

Company profile

  • OwnerMr Justin Adams
  • Member Since2008
  • Public Liability InsuranceSelf-Certified
  • AddressChecked
  • IdentityChecked
  • Checkatrade T&C'sSigned
  • VATYes: 979 1752 64
  • Company typeLtd Company

Company info

Since I started my company I have tried to maintain a fresh approach to building.  I liase with the customer through the whole project to create exactly what the customer wants, whilst suggesting some of my own ideas.

We pride ourselves in customer care & as you will see from my feedback my customers are always happy with the project.

My company specialize in loft conversions/extensions & major structural work but also take on garage conversions, kitchens, bathroom, central heating systems, house electrics, floor/wall tiling, shop fitting & house refurbishment.

I have 20 years experience in the building trade & all of my employees are qualified tradesmen.  

All my work carries a guarantee.

To view my social media accouts,  click here for Facebook  and here for Instagram 

Contact details