Cox Format Developments
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Cox Format Developments
It's human nature to want to find a bargain and get the best deal you can, and this is no different when choosing a builder to building an extension or a loft conversion. However where your home is concerned, cheapest is not always best. We've all seen those programmes about 'cowboy' builders and how they cut corners to do a job as cheaply as possible.

They ofter result in serious consequences for the person whose home they're working on. In the UK there are certain minimum standards for design, construction and alterations to almost any building. These are governed by the Building Regulations 2010 (supported by Approved Documents detailing practical compliance guidance).
Services
Cox Format Developments Limited is an award winning, professional building company specialising in the development of extensions and loft conversions in and around North London, including Barnet, Enfield and Hertfordshire. We have maintained our Which? Trusted Trader status for a number of years. We are extremely proud of the reputation we have built up and we are happy to say that the majority of our work is through personal recommendations.
Cox Format provides a full range of loft conversions in North London for all types of properties. We operate in Barnet, Enfield and wider Hertfordshire. We help our clients maximise the use of their attic by converting this unused space, without having to compromise on any existing outdoor area.

Whether you want to create a master bedroom suite, office space, playroom or additional bedrooms for your growing family, our 35 years plus experience will make sure you get the results you desire.They are generally quicker to complete compared to other types of home extensions and generally do not require planning permission.
At Cox Format we guarantee our prices for extensions in North London and Herts and the quality of our workmanship on all of our jobs. We have been completing house extensions in the North London and Herts area for since the 1980's and have a loyal customer base to prove it. If you wish to see some examples of our single and multi-storey extensions that have completed in the local area then please take a look at our gallery pages.
As the examples below depict, dormers are constructed by adding a vertical extension to the existing sloping roof of the house. This means that the walls in a dormer loft conversion are vertical and the ceiling is horizontal, resulting in a real feeling of space. It is not surprising then that the dormer loft conversion remains a very popular choice for our customers.
The Build Assure backed warranty acts as insurance should Cox Format cease to trade whilst working on your building project. It gives you an added level of protection which should you need to use it will ensure that any outstanding work is completed. The outstanding part of the project will be completed by another Build Assure registered construction company.
Reviews (3)
Tony Walker
Tony Walker
Jan 28, 2022
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Positive: Professionalism
Great service, job well done. Highly recommended
Service: Repair water fixtures
Jamie Needcraft
Jamie Needcraft
Sep 29, 2020
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After several glowing recommendations from business acquaintances about work that Cox Format had undertaken for them, and finding I needed a new roof too, we booked a consultation with Peter Maton the CEO. Peter visited us with Mark Rossi who was to become our Project Manager. With both, their experience and professionalism was immediately evident and reassured us from the start. One of the things that really sets Cox Format apart is that they deal with the job from startto finish. They designed the loft along with all structural elements, and dealt with the council’s Planning and Building
Kate Pidgeon
Kate Pidgeon
Feb 22, 2017
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We have now used Cox Format on 3 separate occasions over many years to carry out loft conversions and kitchen extension. They have consistently worked to a very high standard. In addition to great workmanship (with zero snagging / problems) they are timely, polite and courteous, and they respond to any queries / issues very promptly. Highly recommend.