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Endorsed by Which? Trusted Traders

Cox Format Developments Limited

Profile thumb photo
4.9

33 Reviews

Opening Hours
Today - 07:30–16:30
  • Monday 07:30–16:30
  • Tuesday 07:30–16:30
  • Wednesday 07:30–16:30
  • Thursday 07:30–16:30
  • Friday 07:30–16:30
  • Saturday - Closed
  • Sunday - Closed

About

Cox Format Developments Limited is a professional building company. The majority of our work is through personal recommendations. We are always happy to show previous work and our customers are happy to let you look! We pride ourselves on quoting a good price and sticking to it. Unless you instruct us to, we never add on "extras" as some less reputable builders do as their standard practice.

Because we are professionals, we can see what work is necessary to achieve your objectives, and we price accordingly. Others may quote cheaper initially, then add on what they see as "unforeseen extras". We believe our work is cheaper for the client in the long run.

On Budget... On Time... Everytime.

More information can be found on our web site www.coxformat.co.uk or at www.facebook.com/cox.format
Please like and share our page.

What we do

  • Builders

    • Loft conversions
    • Extensions
    • Building services
    • Garage conversions
    • Log cabins and homes
  • Roofers

    • Chimneys
    • Flat roofing
    • Guttering, fascias and soffits
    • Lead work
    • Roof and skylights
    • Rubber roofing (EPDM)
  • Loft and property converters

  • Bathroom fitters

    • Bathroom design services
    • Bathroom refurbishment
    • Wet rooms
    • Bathroom Installation
    • Accessible bathrooms and showers
  • More Services

    • new build houses
    • velux windows

Customer reviews

Why you can trust these reviews

All reviews are verified as being genuine and a true customer of this trader.

How can we be so sure?

100% of the reviews we publish have been through our stringent moderation process.

4.9
33 reviews
Customer Service
4.9
Quality
5.0
Value
4.8
Sort by
Loft Conversion
Customer Service
Quality
Value
A very professional company, work completed on time, on a budget all done to a high standard. Highly recommended.
John in Greater London Posted on 11/05/2021 , work completed 11/05/2021
Outstanding Loft Conversion Project
Customer Service
Quality
Value
We cannot praise the team at Cox Format highly enough for their professionalism, efficiency and quality of work. Our loft conversion project was their first in 2020 after the national lockdown. We were naturally hesitant and we were working from home which was far from ideal with building works, yet the team ensured that we hardly knew they were there. They were so considerate of our work and our home. Every day they would brief us on the works taking place and every day they delivered. They were innovative, they were cooperative and they were so tidy. The day they broke through for the stairs we couldn't believe it hadn't always been that way - so mess free! Huge thanks to Mark, James and all the team for a hugely successful project. They finished on budget and on the exact date that they said they would complete. We would love to work with Cox Format again and we would have no hesitation in recommending them.
Customer in Greater London Posted on 02/05/2021 , work completed 10/07/2020
Fantastic Work
Customer Service
Quality
Value
We used Cox Format to install a loft conversion. The whole team were extremley proffessional from start to finish. The work was carried out to an extremley high standard, the care and work ethic was outstanding, and the team were so tidy at the end of the day you would hardly know they had been there! The work was on budget and completed within 6 weeks. We are extremley pleased with the end result, which has improved our standard of living - highly recommend this builder!
Customer in Hertfordshire Posted on 26/01/2021 , work completed 15/12/2020
Loft Extension - Exemplary Work During Difficult Times
Customer Service
Quality
Value
Well, what can we say other than Cox Format delivered an exemplary loft extension during incredibly difficult times. The primary team, lead by James, had a work ethic we've never experienced from any other trade we've ever worked with. Come rain or shine, they were at our door at 7.30am waiting to start work. And, at the end of every day, they took the time and effort to ensure they left the house as tidy as it could possibly be. A huge thanks to James, Ash, Jack (and the rest of their team) for their enthusiasm and efforts to ensure we achieved the build we were trying to achieve. From a back office point of view, Mark (Project Manager) was always in contact ensuring we knew exactly what was going on. He was always on hand should we need anything. Did we have any minor issues? Yes, of course. What job wouldn't have any? But, were they sorted out? Absolutely. The Cox Format team take pride in owning any challenges and ensuring they are solved. Would we use Cox in the future? 100% yes. In fact, we've already contacted them to obtain a quote for our side extension! Finally, just to say a massive thank you to Cox for their work.
Customer in Greater London Posted on 21/12/2020 , work completed 18/12/2020
Quality single storey extension
Customer Service
Quality
Value
We had Cox Format complete our single storey rear extension. They took the project from start to end, using their in-house architect through to planning and the build. Our builders, Roy and Charlie were great. They worked incredibly well together and were quick, tidy and generally flawless in their craftsmanship. The brickwork was on point, with there not being a noticeable difference from the old build to the new. Mark was on hand to discuss any concerns, provide advice and dealt with the project throughout its entirety. We are very pleased with the finish. Thank you all at Cox Format.
Customer in Greater London Posted on 23/11/2020 , work completed 30/09/2020
Excellent job
Customer Service
Quality
Value
Completed very professionally. Very happy with all the people involved and recomended. Finished on time and at the agreed budget. Thank you!
Customer in Greater London Posted on 10/11/2020 , work completed 31/08/2020
Professional From Start to Finish
Customer Service
Quality
Value
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 start to finish. They designed the loft along with all structural elements, and dealt with the council’s Planning and Building Control all the way through to sign-off. The other is that they have trained all their staff from an apprenticeship level and it really shows in comparison with other builders who tend to sub out a lot of work. We received a very professional quote along with information on how to notify our neighbours of Party Wall issues. Once we accepted the quote, Mark came back with James, who was our onsite Project Manager. James was exceptional – he really managed all on site elements of the job from start to finish. He kept the job on-track and to an incredibly high standard, even our neighbours couldn’t stop singing his praises. The advice, support and quality of the workmanship was superb. Cox Format had a slogan on their banner which went up on our scaffolding, “On budget, on time….every time.” They more than lived up to the promise and we wouldn’t hesitate to recommend them.
Customer in Greater London Posted on 29/09/2020 , work completed 29/09/2020
Amazing piece of work
Customer Service
Quality
Value
The job was to build an extension at the rear of the house for a wet room next to the small kitchen involving removal of an old toilet block which in turn would give further space to the kitchen. Plans and any queries were thoroughly talked through by the team with ourselves beforehand and throughout the job. Important to us. Payment was done as each stage of the job was completed and our satisfaction assured. The builder - professional - and crew were very hardworking, thoughtful, polite and tidied at the end if each day. The end result was a piece of craftsmanship - a creation of space one could not have imagined. We would recommend Cox for your building needs.
Customer in Greater London Posted on 02/02/2020 , work completed 11/11/2019
Loft Conversion to en suite bedroom in Barnet
Customer Service
Quality
Value
Well organised and good communication ensured a good job with minor issues promptly resolved. We are very pleased with the outcome and would recommend Cox Format to others.
Customer in Greater London Posted on 31/12/2019 , work completed 01/11/2019
Throrough and pleasant
Customer Service
Quality
Value
We have had two lots of fairly minor repairs carried out by Cox Format, both were done very well by very pleasant workers - recommended.
Customer in Greater London Posted on 11/11/2019 , work completed 28/10/2019
Loft conversion and first floor bathroom remodel
Customer Service
Quality
Value
We took our time to make a decision regarding building companies. With such a big project, we wanted to make sure we got it right. We could not be happier that we decided to go with Cox Format. The builders were all professional, courteous and respectful of ours and our neighbours' properties. They were always on time and tidied up at the end of every day. The foreman was clear in his communication and open to questions and concerns throughout the build. The project was completed on time, as projected, and we are beyond pleased with the quality of the work. No cutting corners, no "patch jobs"; they ensured that things were done right. Some companies may cost less, but you get what you pay for. I wouldn't hesitate to recommend Cox Format.
Angela, Greater London Posted on 02/07/2019 , work completed 01/06/2019
High quality work
Customer Service
Quality
Value
We had an L-shaped, double dormer, loft conversion on our Victorian terraced house. The work was completed on schedule in 6 weeks, despite bad weather, and was of an excellent standard. The whole team were professional and very easy to deal with. There was clear communication between all of the Cox format team, the project manager and ourselves, and queries and changes were dealt with in a timely manner. There was a clearly laid out payment plan with transparent costings. We would thoroughly recommend the company.
Customer in Greater London Posted on 10/06/2019 , work completed 09/05/2019
Rear Extension
Customer Service
Quality
Value
We recently completed an extension to the rear of our house. From the start of the design process through to the construction, Cox Format demonstrated professionalism, expertise and customer service with a clear passion for their business. It was clear from the start that their purpose was to ensure the clients expectations and satisfaction were met and put in the time and effort to ensure they met their goal. From start to finish the project went smoothly. We had regular meetings with the Project Manager to receive updates, review progress and discuss any changes. Any last minute changes were incorporated easily. The workforce turned up promptly every morning at 7AM and were respectful and trustworthy, and accomplished excellent work with paying attention to detail. Our home surroundings were protected to prevent any damage. We were impressed with the workmanship and speed with which the work progressed. The workplace was always left clean, tidy and safe at the end of the day. We've had an excellent experience with Cox Format and are very pleased with our finished product which was delivered on time and within budget. I would recommend Cox Format as our expectations were highly met and simply, quite stress free due to their organised and dedicated approach to their business.
Customer in Greater London Posted on 01/05/2019 , work completed 14/12/2018
Great company with a lot of experience.
Customer Service
Quality
Value
We chose Cox Format to do our loft conversation because they're Which? Trusted Traders and we wanted a loft conversion done that required lowering some ceilings to make room. Cox's team were excellent at managing all aspects of the conversion, from completing the council paperwork, to providing detailed quotes and timelines. Mark, Project Manager, took into account all of our requirements and provided a lot of flexibility with additional tasks that we wanted done, such as custom spotlights and additional electrics. He also provided us with a timeline of work to help us manage expectation. A major plus was how quickly and professionally they built the loft, choosing additional manpower instead of sacrificing quality. We were able to see everything as it progressed, and the builders were happy to answer all of our questions. Everything was solidly built, finished, and plastered to a high degree. Both the builders and the subcontractors involved worked to a high standard while taking care of our house. Cox gave us an estimate of eight weeks to do the loft conversion. Eight weeks later the loft was complete and Cox Format delivered us the Final Certificate to show that it had passed all inspections. The build went smoothly, and we highly recommend them to anyone who wants a hassle-free loft extension.
Customer in Greater London Posted on 18/04/2019 , work completed 05/04/2019
Ground Floor Rear Extension and Kitchen/Dining Room remodel
Customer Service
Quality
Value
Our project was to extend and completely remodel the back half of our terraced house. Cox format delivered the job to time and cost once our requested extras where factored in. They even managed to work around our daughters A Level revision timetable All work was professional and of high quality - we liked how tidy the work site was left each night Mark kept us informed throughout with regular updates and site meetings.
Customer in Greater London Posted on 18/04/2019 , work completed 05/10/2018
Design and Build Loft Conversion
Customer Service
Quality
Value
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 0730 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.
Customer in Hertfordshire Posted on 25/01/2019 , work completed 21/12/2018
Stress Free Builders
Customer Service
Quality
Value
Cox Format have just finished an extension for us and it is excellent! When looking for a suitable builder we were seeking quality of workmanship, timeliness, cleanliness, friendliness and real value for money. Cox Format delivered all of these. They kept us well informed as the work progressed and listened when we sought any clarifications. They finished on time and to cost. We felt at ease throughout the whole build. All I can say is that I would recommend them without hesitation.
Customer in Greater London Posted on 17/12/2018 , work completed 10/12/2018
Loft Conversion. A Great Job in a Timely Manner
Customer Service
Quality
Value
Good service and great quality of work carried out in a timely manner without cutting any corners. In the main they used there own directly employed workforce and kept a working project manager on site throughout. This was ideal as we had one point of contact and were able to build up the rapport and the trust which is essential when you have people at times working in your house unsupervised. Would definitely recommend Cox Format.
Customer in Greater London Posted on 29/11/2018 , work completed 02/06/2018
Whole House Refurbishment
Customer Service
Quality
Value
Cox Format has just completed our whole house refurbishment, including an attic conversion and a kitchen extension. They were professional, trustworthy and extremely easy to deal with throughout the project. Their project manager & foremen were excellent, and all queries and issues were dealt with promptly and effectively. Their original estimate time frame was about 4-5 months which we thought was very ambitious considering the size of our project, but they completed the whole project on time without any delays. Needless to say, the finished job was superb and we moved into our new house on time 2 weeks ago and are thrilled with all the work they have done! We can’t recommend Cox Format highly enough for their skill and professionalism.
Customer in Greater London Posted on 28/11/2018 , work completed 09/11/2018
Porch & Side Extensions
Customer Service
Quality
Value
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 Darwish Posted on 17/07/2018 , work completed 17/07/2018
New chimney flashings
Customer Service
Quality
Value
Good quality work, pleasant and reliable people - recommended.
Fage Posted on 19/01/2018 , work completed 19/01/2018
Loft Conversion
Customer Service
Quality
Value
As we embarked upon our first renovation project we were excited though understandably a little apprehensive. Appointing Cox Format, we were rewarded with a definitive team lead by an efficient, highly skilled and organised foreman. Daily we were greeted with enthusiasm, reassurance and updates on each stage of the build. Astounded with the level of professionalism provided by the team, their understanding and respect gave us peace of mind and minimum disruption to our home. We couldn’t be more pleased with the completion of our loft conversion. The whole process was painless due to the competence of Cox Format. Grade A workmanship. With confidence and zero apprehension we look forward to Phase 2 of our home renovations and welcoming Cox Format back into our home. Mr & Mrs Te-Ng
Collette Tec Posted on 11/01/2018 , work completed 11/01/2018
Garage Conversion
Customer Service
Quality
Value
This is the second time we've used Cox Format and we would definitely use them again. They are professional, polite and carried out the work within their estimated time frame and with a great finish. Thank you to the whole team. Mr and Mrs Destro
Mr and Mrs Destro Posted on 14/12/2017 , work completed 14/12/2017
True professionals who really care!
Customer Service
Quality
Value
We used Cox Format for our house refurbishment and the external electrics and lighting for our garden. They had been highly recommended by several neighbours and did not disappoint. All their tradesmen were excellent, fully engaged, and reliable. Their electrician is I believe the best in the business. The few issues that appeared along the way were dealt with swiftly. They are an extremely pleasant company to deal with, and are unlike any other building firm we had come across. True professionals who really care! Peter runs a very tight ship and fully participated in the project and was on site on a very regular basis directing traffic. Mark was in charge of project management and ensured everything ran to plan with no downtime.
Newman Posted on 18/08/2017 , work completed 18/08/2017
Garage converted to a bedroom by Cox Format
Customer Service
Quality
Value
Using Which Trusted Traders website I chose 3 Companies to get quotes for this job. I chose Cox Format Developments Limited because they appeared competent & were able to do the complete package – design, building applications, complete build & certificates. Although a small job this was done very professionally. Once work began it continued every day until completion. It was done to a high standard & ALL the people who carried out the work were dependable, knew what they were doing and very pleasant. This was not the cheapest quote I got but you must remember your house is the biggest investment you have. So it was important to choose the correct people, you hear too many bad stories. Anyway the cost of the conversion increased the value of the house by more the cost of the build. The work was done on time and everyone at home was happy with the conversion. I would certainly recommend Cox Format for any building work. Chris 01/06/2017
Christopher Posted on 01/06/2017 , work completed 01/06/2017
On time and on budget professional service
Customer Service
Quality
Value
We decided to appoint Cox Format for our loft conversion after considerable research, which included viewings of their work at other houses and a visit to their offices, which further instilled confidence. Their team are professional, reliable, courteous, and respectful of their customer's property and their wishes. Peter and Mark were continually visible, always addressed any slight issues we pointed out, and they ensured their contractors also worked to the same standards as their team. We have no hesitation in recommending them and their workmanship.
theomaria Posted on 25/05/2017 , work completed 25/05/2017
Loft conversion - without the stress!
Customer Service
Quality
Value
I had seen lots of development disaster stories on TV, hence i was slightly apprehensive when i decided to do a loft conversion. I obtained several quotes from builders but the minute i spoke with Cox format, i got the sense they were the sort of builders i had been looking for. They were thoroughly professional, specific, clear and transparent. Having viewed one of their recent projects, i proceeded with them for the build. My loft project started exactly on time, and each pre-defined stage proceeded with precision. Work was carried out on a daily basis (managed by James) and the major stages were completed ahead of schedule. Communication was superb, with almost daily updates on progress. Specifically, Mark had an unbelievably swift turnaround time when responding to my emails / texts / calls etc.. and this high standard was maintained from start to finish of the project duration...certainly exceeding my expectations. The quality of the work was excellent, and i have absolutely nothing to fault... which is really rare in my case. I would definitely use Cox format again and their number is already first on my list for any future development needs. I would recommended them in a heart beat.
Olan_Od Posted on 24/05/2017 , work completed 24/05/2017
Professional and Timely Service
Customer Service
Quality
Value
Cox Format recently carried out a loft conversion work as well as a whole array of additional renovations at my property appointed to them as a result of their professional approach. I found this company very professional, efficient and reliable. They run a team of skilled people and the workmanship is of a very good standard. I do not hesitate to recommend them for related projects.
Which? Trusted Traders Consumer Posted on 22/05/2017 , work completed 22/05/2017
Builders who care
Customer Service
Quality
Value
We used Cox Format for our house refurbishment and the external electrics and lighting for our garden . They had been highly recommended by several neighbours and did not disappoint. All their tradesmen were excellent, fully engaged, and reliable. Their electrician is I believe the best in the business. The few issues that appeared along the way were dealt with swiftly. They are an extremely pleasant company to deal with, and are unlike any other building firm we had come across. True professionals who really care! Peter runs a very tight ship and fully participated in the project and was on site on a very regular basis directing traffic. Mark was in charge of project management and ensured everything ran to plan with no downtime. Drew Newman High Barnet
rossim Posted on 20/05/2017 , work completed 20/05/2017
Loft conversion.
Customer Service
Quality
Value
I have had a loft conversion carried out recently by Cox Format ltd. Even though I had three additional quotes from other companies which were also competitive I eventually settled on Cox Format. I did this for several reasons. 1.They are an established company with a directly employed labour force. 2.The standard of their work is of the highest quality. 3.Their planning and co-ordination of material deliveries and different trades is first class. 4.They have excellent site supervision on the project from start to finish. 5.Any additional works outside the scope is clearly priced so there are no late surprises on budgets. 6.Perhaps and this is very rare despite promises they stick to their agreed programmes without comprising safety or quality. In conclusion they are a first class company who do exactly what they say and to programme.
patrick Posted on 27/04/2017 , work completed 27/04/2017
Very high standard of work
Customer Service
Quality
Value
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.
Kate Posted on 22/02/2017 , work completed 22/02/2017
Loft Conversion in Barnet
Customer Service
Quality
Value
The team were well organised and arrived on time every day. All trades were of very good standard and the finish to the build is excellent. Any small issues that we had were sorted out and the foreman was polite and made sure everything happened when it was supposed to. The job was completed on time and to a very high standard. I would recommend Cox Format.
jonesij Posted on 09/10/2015 , work completed 09/10/2015
Which? Local Review
Customer Service
Quality
Value
Cox Format did a hip to gable loft conversion on our semi-detached house. The build was on time and on budget. The guys worked quickly and efficiently. Small issues that arose during the process were dealt with efficiently and without trouble. Highly recommended.
Preyesh Posted on 22/04/2010 , work completed 22/04/2010