Cox Format Developments Limited

Based in Barnet

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Cox Format Developments Limited is a professional building company working within parts of north London and Hertfordshire specialising in Loft Conversions and Extensions with the majority of our work coming through personal recommendations. We pride ourselves on quoting a good price and …

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Trades

Builder

Builder general
Project management
Insurance Work (Fire/Flood/Damage)
Refurbishments
Structural steelwork

Extensions/Conversions

Loft conversions
General extension
Garage conversions
Home office

Bathrooms

Wet rooms
Bathroom Design
Bathroom fitter
Bathroom tiling

Brickwork

Brick work
Bricklayer

Windows, Doors and Conservatories

Velux windows
Double glazing
Skylight/Loft windows
Porches

Carpenter and Joiner

Staircases
General carpentry
Door fitting/hanging

Roofer

Dormer / Roof windows
Fascias
Soffits
Guttering
Skylights

House Builder

New build
Custom/Self Build

Landscaper

Garden rooms

Tiler

Wall tiling
Floor tiling

Kitchens

Kitchen installation

Disabled/elderly home adaptation

Accessible Bathrooms
Accessible Kitchens

Projects

Double Hip to Gable Loft Conversion and Rear Extension - Whetsone North London N20

This project involved a large loft and single story rear extension project for a local family in Whetstone North London who need more space. The family approached us on a … Read more This project involved a large loft and single story rear extension project for a local family in Whetstone North London who need more space. The family approached us on a recommendation from friends who are previous clients of ours. In fact, a large percentage of our business is either repeat or direct recommendation. This family had a strict budget they wanted to work within so we spent extra time with them developing a comprehensive scope of works. They specifically asked us to provide lots of detail to help them with their budgeting as they wanted to avoid any unforeseen costs. We employ a project manager that goes the extra mile for clients and spends time helping with whatever questions they may have.
This family’s loft will not only add much needed living and storage space but will increase the value of their home. It’s so much more cost effective to spend money on loft conversions and extensions nowadays, rather than stamp duty and solicitor’s fees that can add up to a significant amount when moving to a new house.
Double Hip to Gable Loft Extension
We’ve built a double hip to gable loft extension that has provided a large double bedroom, walk-in dressing area, shower room and loads of extra under eaves and under stairs storage space.The client also asked us to renew the roof at the same time which will save them money in the long run as we used the same scaffolding as for the loft. As part of the design and build process that we offer, we worked with the client’s brief for lots of natural light. The loft has two Velux windows, two gable windows giving light to the new stairwell plus bathroom and bedroom windows. There is also the luxury of a walk-in dressing area in front of the shower room and extra storage space under the eaves. This is accessible via low level doors and is boarded and insulated.
At ground floor, we’re building a rear extension with large windows, French doors and an aluminium double-glazed roof lantern which provide lots of natural light and make it feel like part of the garden.
We spent time sourcing new bricks and windows so that it all matches the existing house. We’ve also built a set of wide, redbrick steps that lead down to a garden music room.
Cox Format are a WHICH Trusted Trader and member of the Federation of Master Builders. Read less

Loft Conversion - High Barnet EN5

This project is for a lovely retired couple who wanted to create more space for visiting grandchildren and at the same time add a substantial amount of value to their … Read more

Loft Conversion - North London, Southgate N14

This property is a large Edwardian style terraced house in the sought after area of Southgate, North London N14. Our brief wasto convert the existing loft space and build a … Read more

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Testimonials

After obtaining several quotes I engaged Cox Format Development to build my ground floor extension and loft conversion. They were on site every day and from the start their staff were helpful, courteous and tidy, which was a huge bonus as I lived on site throughout. Even my neighbours were happy with them. CFD were great at communicating what was happening and what would be done next. James would check in regularly to ask me if I was happy with the work and any queries they answered and were helpful in offering advice. All extra costs Mark quoted for and agreed in writing with me before any extra work was started. These were costs that could not have been foreseen until work had started and were needed for building control to approve or they were costs for extra items that I requested. The build quality is amazing, and I am incredibly happy with how my kitchen diner looks. I have no hesitation in recommending Cox Format to anyone looking for a builder.

Teresa
St Albans
Mar 2025

We engaged Cox Format to design and build our dormer loft conversion. They made well thought out plans with our input and took care of the planning permission and the subsequent appeal. They communicated the start date and from then on were at work solidly until they finished. Arriving everyday without fail at 07.30 and getting straight to work. Starting at this time allowed us to discuss and take any decisions the team needed before leaving for work ourselves. The team were well presented, professional, polite and hard working, paid good attention to detail and always tidied up before leaving for the day. The back office staff produced a detailed quote and payment plan with an itemised list of any additional payments. I would absolutely recommend Cox Format for your loft conversion.

Samantha
Shenley in Hertfordshire
Feb 2019

Dear Peter We just wanted to thank you for all the hard work your guys have put into our project. The work was done to a very high standard and we are thrilled with the outcome. James, Graham & Mark’s inputs were invaluable to this project. Mark has given consistent support from beginning to the end - his professionalism was one of the main reasons for choosing Cox Format as our contractor. His promptness in dealing with issues was second to none. Both Graham & James exceeded our expectation as foremen. Their managerial & organisational skills on top of their craftsmanship were the catalyst for the success of our project. Also Graham’s carpentry skills are superb, which must be a real asset to your company. Thank you again for all your support for the past 5 months. All the best, James & Yoko

Yoko
Highgate, North London.
Nov 2018

The whole project ran like a military operation and if things fell behind due to unforeseen circumstances Cox Format caught up with things by sending in reinforcements. There were regular site visits by the Managers and constant feed back. We received helpful advice throughout. We were very pleased with the work which was finished to a high standard and on time and all of the workmen were very obliging. Danny

Danny
Barnet
Jul 2018

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