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JMB Design & Build
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About Us
Free consultation
Family owned
3x Best of Houzz winner
Hertfordshire Leading Build Team | Extensions & Renovations
JMB Design & Build is a full service building construction company dedicated to building and improving residential and commercial structures according to client needs and desires. Owned and managed by James Boulton, himself and his team have over 25 years of experience in the industry with qualifications in carpentry, plastering and bricklaying.
Based in Hertfordshire, the team at JMB is ready to give your space whatever updates it requires.
Our skilled team of builders adopt a thorough approach to ensure every renovation project we undertake is delivered on time, budget and to the highest standard. Whether you want to update a tired looking property or just want to modernise a single room (Kitchen or Bathroom) we can provide you with a huge range of renovation solutions to revive your home.
Just give us a call or enquire online today and we’ll get back to you as soon as we can with a quote.
Services Provided
Architectural Design, Architectural Drawings, Building Design, Complete Kitchen Renovation, Eco Homes, Foundations Construction, Garage Building, Home Renovation, House Extensions, House Plans, House Restoration, Kitchen Design, Loft Conversion, New Home Build, Project Management, Site Planning, Site Preparation, Space Planning, Sustainable Design, Custom Build Home
Areas Served
Potters Bar, Hertfordshire, Barnet
Awards
Best of Houzz 2023
Category
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8 Projects
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Business Details
Business Name
JMB Design & Build
Phone Number
07908 815645
Website
Address
JMB Design & Build
Potters Bar EN6 1QA
United Kingdom
Followers
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Credentials
3 Houzz Awards
2 Houzz Badges
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Featured Review
jamesedgerley
Average rating: 5 out of 5 starsJames and the team really were excellent from start to finish. They were dependable, knowledgeable and the works were to a very good standard. The team worked quickly and were always keen to solve any challenges which arose. When another contractor wRead Full Review
27 Reviews for JMB Design & Build
Newest first
Average rating: 5 out of 5 stars5.0|27 reviews
Work Quality5.0
Communication5.0
Value5.0
HU-64652104186
Average rating: 5 out of 5 stars
I recently had the pleasure of collaborating with JMB Build and Design on the ambitious task of renovating my home. James attentively listened to my vision, even when it seemed challenging, yet he consistently delivered flawless results.
Throughout the project, James and his team demonstrated professionalism, reliability, and remarkable skill. The quality of JMB’s workmanship surpassed all expectations, turning my dream into reality in record time. I am sincerely grateful for their expertise and unwavering dedication to my renovation project.
I wholeheartedly endorse JMB – if you're looking to transform your vision into reality, JMB is the team for you.
Thank you once again, James and team, for an outstanding job.
16 February, 2024Last modified:16 February, 2024
HU-363475422
Average rating: 5 out of 5 stars
James and the team transformed our bungalow into exactly what we had hoped for and all within the initial fee scope. The team are respectful, polite and knowledgable. We’ve recommended JMB to friends for similar projects and would definitely use them again.
14 February, 2024
HU-459509137
Average rating: 5 out of 5 stars
We used JMB design & build for our double storey, side extension. Throughout the entire project, James talked us through every stage and felt very comfortable with everything. All of James' team were very professional & the quality of work was first class. As with such a large building project like this, we encountered some challenges along the way e.g. heavy rain causing leaks, drains being blocked up but James & his team were quick to find solutions and minimise any further disruption. We loved having the team work on our house, they were so courteous and treated our house like it was their own. There are too many names to mention from the team that we like to thank, but a special call out goes to Owen, Sam & Ricky, who were invloved in our building work from the first day to the final completion. We are blown away with our lovely, newly extended house and would definitely recommend James & his team for any building work. Thank you to JMB design & build.
18 January, 2024
John Conlon
Average rating: 5 out of 5 stars
James and his team completed the redevelopment of my house on time, within budget and to an exceptional standard
I was particularly pleased with the innovative ideas that James had when we were met with a number of challenges during the project
I would not hesitate to recommend JMB and I will be using them on my next project which will start in 2024
9 October, 2023
Comment from JMB Design & Build:
Hi John,
Various challenges are natural in the construction industry, but I am delighted you were satisfied with our approach when these occurred.
All the best,
James
Various challenges are natural in the construction industry, but I am delighted you were satisfied with our approach when these occurred.
All the best,
James
jamesedgerley
Average rating: 5 out of 5 stars
James and the team really were excellent from start to finish. They were dependable, knowledgeable and the works were to a very good standard. The team worked quickly and were always keen to solve any challenges which arose.
When another contractor who we had lined up to install the flooring did not perform, JMB really helped us out in quickly taking over their works so we could get back into our house as soon as possible with our new baby.
A big thank you to James, Owen and the rest of the team! We love our new home.
24 August, 2023
Comment from JMB Design & Build:
Hi James,
Thanks for leaving such a glaring review. I have let the team know and they are delighted with your feedback!
All the best,
James
Thanks for leaving such a glaring review. I have let the team know and they are delighted with your feedback!
All the best,
James
James was the final builder we met before making a decision. We had seen quite a few but James was different. As soon as we opened our front door we knew he was the man for the job. An instinct which proved correct.
James and his team were great. Friendly, professional, respectful, helpful, all done with a sense of humour. The renovation of our bungalow has surpassed our dreams. James is a designer as well which was so handy when he knew something wasn’t going to work. He took time to explain his solution and we trusted his judgment. Any time we wanted to query something, he would endeavour to be at the property quickly to discuss .
We are now back in our lovely home which we are excited to showcase to our family and friends. Even the washing machine repair man, who had visited us before the work started, remarked on the wow factor. From a dingy 1960 bungalow we now have a home where we’re always glad to return.
We are very happy to recommend James and his team. They’ve done a terrific job.
16 July, 2023
Comment from JMB Design & Build:
Hi Bob,
Thanks for the vote of confidence and I am glad we proved your instincts correct!
All the best,
James
Thanks for the vote of confidence and I am glad we proved your instincts correct!
All the best,
James
Sue Davies
Average rating: 5 out of 5 stars
We decided we wanted to make some changes to our semi-detached cottage, we had a few building firms come to see us, what swayed our decision to choose JMB was the design ideas and also James’s approach, very straight talking and transparent.
We extended to the side and back and completely reconfigured our downstairs changing our original 2 bedroom one en-suite, loft room, main bathroom downstairs, small kitchen, separate living and dining areas and a very old-fashioned cottage garden. It now has two en-suite bedrooms, the main bedroom with a vaulted ceiling Juliet balcony and en-suit bath, walk in shower and toilet. Second bedroom en-suite shower and toilet. Loft changed to an office/ spare room. downstairs now has underfloor heating throughout, ceiling speakers and an open plan sitting and dining area, large modern kitchen with an island that seats 4, downstairs cloakroom and bi-folds that open onto the patio and modern garden with built in BBQ.
James also has a great team that work hard and efficiently, very respectful, tidy and their finish is to a very high standard. We are delighted with our ‘new’ home and wouldn’t hesitate to recommend JMB
23 May, 2023
Comment from JMB Design & Build:
Hi Sue,
Thanks for leaving such a detailed review.
We hope you are loving your improved home!
All the best,
James
Thanks for leaving such a detailed review.
We hope you are loving your improved home!
All the best,
James
Teena Bradbury
Average rating: 5 out of 5 stars
We used JMB Design & Build for a single storey extension across the back of our house. James provided excellent advice on planning the space and the options open to us. We went with a pitched roof with two electric Velux windows as opposed to the usual flat roof, which has been the best decision we made giving us a lovely light and bright entertaining space. The building team were excellent and worked quickly and efficiently throughout from foundations to decorating, and I would have no hesitation in recommending them for building projects.
6 April, 2023
Comment from JMB Design & Build:
Hi Teena,
Thank you so much for this review.
We are delighted you are happy with your extension.
All the best,
James
Thank you so much for this review.
We are delighted you are happy with your extension.
All the best,
James
Dr Ranjan Das
Average rating: 5 out of 5 stars
Good professional job. Finished in time. Happy with the new extension.
21 March, 2023
Comment from JMB Design & Build:
Hi Ranjan,
Thanks so much for this review!
We are delighted that you are happy with the new extension.
Wishing you all the best for the future.
Thanks so much for this review!
We are delighted that you are happy with the new extension.
Wishing you all the best for the future.
James and his team did a really excellent job on our kitchen and utility room and we are delighted with the final result. They were efficient, with great attention to detail. There were no hidden extras and the project completed on time.
James and Janette were very nice to deal with. Always helpful and responsive. We will definitely return for future projects.
25 February, 2023
Comment from JMB Design & Build:
Hi Adrian,
It was a pleasure working with you. I have passed your comments onto Janette, who was thrilled to hear your feedback.
All the best,
James
It was a pleasure working with you. I have passed your comments onto Janette, who was thrilled to hear your feedback.
All the best,
James
House Extension rewiring of the property and
Average rating: 5 out of 5 stars
JMB Design & Build are the most trustworthy people in this area. I had a house extension done. They responded to my queries promptly, completed the project within the budget (including minor additions to the scope of works) and in a very reasonable timeframe. The workers treated my house and family with at most respect. We continued to live in the liveable area and work itself progressed without any disruption. I carried the design via an external architect. In the hindsight I will most definitely request the design from JMB’s firm directly. Since they took care of all the inspections required for the works. Myself and my family are really happy with their works and management of the same. Regular visits by James (Owner and project manager of this project) helped to resolve any challenges that we came across very amicably. James made himself available over the phone as well, whenever we needed his support to move things forward. I would definitely recommend this firm for any House extension type works. I would like to take this opportunity to thank James and his team for completing the work to good quality.
24 February, 2023
Comment from JMB Design & Build:
What a detailed review!
Thank you so much and we are delighted your extension was everything you dreamed it would be.
All the best,
James
Thank you so much and we are delighted your extension was everything you dreamed it would be.
All the best,
James
Ben Turner
Average rating: 5 out of 5 stars
Taking on such a large protect is always daunting and working with James has took away all the worry and stress. James’s honest approach to everything through out the project allowed me to be at ease.
Also upon finishing I cannot be happier with the end product and quality of his team’s workmanship.
24 February, 2023
Comment from JMB Design & Build:
Honest we are Ben!
Thank you for leaving such a positive review.
All the best,
James
Thank you for leaving such a positive review.
All the best,
James
James and his team did a fabulous job in our house, converting the loft to a spacious bedroom and downstairs creating an open plan kitchen dining area, removing a chimney breast, replastering, woodwork and decorating all finished to a high standard. They were reliable, very conscientious and extremely tidy. Wouldn’t hesitate to recommend them!
11 January, 2023
HU-680012660
Average rating: 5 out of 5 stars
My objectives were to creat a toilet from a built in pantry, create sufficient storage so as to keep worktops 100% free, leave no appliances exposed, modernise exterior power and lighting, improve power efficiency and modernise styling. I failed in that I have a toaster, spoon rest and a box of tissues on the work top. My favourite features are the boiling water tap, built in coffee and tea bar and several automatic light systems.
With such a multi-trade discipline I looked for a company I could trust and found them via Houzz. JMB Design & Build cleverly solved any problems as they arose and completed to my entire satisfaction. James managed my project professionally and wisely - always making sure I was a happy bunny. His back up administrator Jannett kept lines of communication flowing so I needn’t worry about anything. I also appreciated the skilled craftsmen employed by James and found them to be very considerate. Obviously I wouldn’t hesitate to recommend JMB for your project.
Regards
Geoffrey Da Costa
25 October, 2022
Comment from JMB Design & Build:
Thank you for such a brilliant review Geoffrey!
We hope you are loving your new home.
All the best,
James
We hope you are loving your new home.
All the best,
James
James and his team our outstanding
There dedication and eye for detail is the reason why i use JMB
They've done 4 jobs for me now and we're got many more in the pipe line
Best around highly recommend
16 October, 2022
Josh Woodhouse. Bedroom kitchen and bathroom
Average rating: 5 out of 5 stars
JMB have been excellent. James was professional, punctual, knowledgable and always happy to help and give honest and constructive advice. JMB have delivered on multiple projects around our home. The first a full renovation of our master bedroom, with a walk in wardrobe and en suite fitted. The next was a kitchen renovation which has totally transformed the space and feel of our home. Finally a downstairs toilet transformed into full wet room with built in shower. Genuinely couldn’t recommend JMB enough.
14 October, 2022
Emily wing
Average rating: 5 out of 5 stars
amazing professional service,
very efficient and got the job done to a very high standard
thank you will defiantly use you in the future and will be recommending you!
13 October, 2022
Kitchen extension
Average rating: 5 out of 5 stars
James and he’s team done an amazing job start to finish I would highly recommend them and il be using them again in the future
7 October, 2022
Stuart Cook
Average rating: 5 out of 5 stars
Good quality workmanship with a team of pleasant professionals who work hard. I can recommend JMB for high quality renovation works and loft conversions.
8 September, 2022
max woodhouse
Average rating: 5 out of 5 stars
JMB undertook a full renovation of my flat including bathroom, kitchen, plumbing and rewire. Everything was done to an exceptional standard and we were very happy with the fisnihed result. I would highly reccomend JMB and will be using them in the future should I need any further building works!
22 August, 2022
HU-690568691100
Average rating: 5 out of 5 stars
If your are considering to have building work done to your property, I would highly recommend speaking to James at JMB. They will ensure the job is completed correctly.
James runs a highly professional building company with high quality tradesmen.
They have completed our house extension with a full refurbishment of the ground floor and it has been of really high quality from the very first day.
James is very particular in getting things done correctly, even if that means his staff need to redo the job to get it right and meet his standards.
I can see why JMB carry out a lot of large projects as they ensure good work in a timely manner.
I would highly recommend JMB for any construction work and I have already passed on his details to a few friends and family.
21 May, 2021
HU-25645264
Average rating: 5 out of 5 stars
The project was complete refurbishment of a 5 bed, 3 bath + wc family home, with a rear, extension, and roof extension. The works included solar panels, air conditioning, CCTV, wi-fi systems and high levels of thermal and acoustic insulation. James and his building team were proactive, courteous, and helpful. They made timely progress each week on site. Additional items requested by the client were undertaken quickly and at a reasonable cost. James insisted the site was kept tidy and made regular visits to ensure the quality and progress of the works. He stood up for quality and took a pride in his companies work. He and his team reacted well with the client.
I was the architect and client representative on the scheme.
17 February, 2021Last modified:17 February, 2021
HU-752947657
Average rating: 5 out of 5 stars
Highly recommend James and his team at JMB.
Getting an extension or any other major works done on a property is always an anxious time. James and all his team that worked on our property were immensely professional and friendly. They went the extra mile to keep mess to a minimum and clean up after themselves as best as possible each day. This makes a huge difference on the impact it has on a stressful time.
We benefitted from and were reassured by James' daily site visits which included discussions on any issues and daily progress and schedules and were eventually happy to let him make decisions for us. They were also happy to change tack at times in exactly what direction the works were going.
I would unreservedly recommend JMB and would use them again if needed. They were extremely competitive in price, friendly, competent, professional, and completed the works to a very high standard and on time.
4 February, 2021
Peter
Average rating: 5 out of 5 stars
We are very pleased with our kitchen extension. James(JMB) did an excellent job. He set himself high standards and he was only content when these are achieved. This has culminated in a very successful project. Everone loves our kitchen. We would not hesitate in recommending James.
3 February, 2021
James is one of the most professional builders I have ever met. Since day one on the project, he was always willing to put us first and making sure all our needs were met. Even when changes happened through out he would go out of his way to make sure we were happy with the product and end result. When we had given James ideas of what we wanted doing he would give us various options and made sure everything was up to a high standard of work. I found him to be honest, hardworking and always keeping us up to date.
If/When I need more work doing I'll be sure to call him and his team again.
3 February, 2021Last modified:22 June, 2023
HU-339274174
Average rating: 5 out of 5 stars
James and his team constructed a 4 x 11 meter extension at my house. We lived at the property whilst the work was conducted. His team of staff are very good at what they do. I also liked James for the simple reason is that he is honest and he answers the phone. No building work ever runs smoothly but any problems we had James and his team managed to overcome. The dreaded word “extras” were kept to an absolute minimum and we are delighted with our finished product. Would 100% recommend James and his team to anyone that wants work completed to a high standard.
27 January, 2021
Andy Bellamy
Average rating: 5 out of 5 stars
James and his team were incredibly professional throughout the project. The design ideas and the building work involved to “make them happen” were exemplary. The management and communication of expectations and price as we uncovered challenging issues with the cottage were also very clear and easy to understand from a layman perspective. With reference to COVID, the team were always very respectful of the necessary working practices and despite materials being somewhat scarce there were no delays to the completion of the project.
26 January, 2021
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I have passed your feedback onto Owen, Sam and Ricky, who were delighted to receive recognition!
All the best,
James