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About Us

About Us

Welcome to Modex.

You may notice that we have changed the way we look. We are still the same ‘clarks modular buildings’ … inside but have freshened our look to more accurately reflect us as a business.

Our enthusiasiam comes from our knowledge of the Modular Building industry. We provide the best solutions with confidence and clarity. Our intelligence is never smug or superior; being a family business it is inclusive, and all encompassing. We are enthusiastic about doing a good job, and this comes through in all areas  of communication in our business. We are excited and passionate about the possibilities of the modular space, and what we can be achieved together.


Excellent design is a vital ingredient of our continuous innovation within the modular industry. We value design and start every project with identifying, exploring and ultimately understanding the needs of the user or audience in question to create unique spaces that fit the needs of our customers. We thrive on problem solving and are flexible in our approach and aim to create the best design solution.



We are a family business and treat everyone we make contact with, with the same respect, honesty, and sincerity, whether they‘re our staff, suppliers or customers. We are collaborative in our approach to the way we work, and value our teams ideas and input. When we say we will do something, we will do it to the highest standard.



We are a ‘safe pair of hands’. We can be trusted to do what we say we’ll do. Our multitude of skills in our workshops and offices has allowed us to create a sustainable business for the future. Established in 1951 and previously known as Clarks Modular Building; we’re here for the long haul, our heritage wouldn’t allow otherwise.

Our Mission

By providing a dedicated personable service, we will constantly develop our modular space offering and our customers perception of the norm.

Our goal is to provide versatile, reliable and affordable modular spaces.

We believe our commitment to design, innovation, reliability, and an unequaled customer service is essential in enhancing our growth and cementing our position in our industry.


Our Mission


The Modex story spans over 60 years. Read how the company has evolved from the begining to where we are now.


Established, PH CLARK (TIERS CROSS) LTD, Waterloo Industrial Estate, Pembroke Dock


New Depot at Freshmoor Road, Cardiff trading as CLARKS CABINHIRE - Hire & Sale of Jackleg Cabins


Opened New Depot in Cross-Keys for Hire & Sale of Modular Buildings trading as BLUEBOX


Merged CLARKS CABINHIRE & BLUEBOX at the Cardiff Depot to solely supply Modular Buildings t/a CLARKS PORTABLE ACCOMMODATION


trading name changed to CLARKS MODULAR BUILDINGS


Registered Company Name changed to CLARKS MODULAR BUILDINGS LTD


Management Buy-Out (by MODEX BUILDINGS LTD)


Re-Brand / New Company Trading Name MODEX SPACES LTD

Management Team

Our team are confident that they offer 5-star service for all of our projects, from initial enquiry to handover and aftercare management.

Ellis John

Managing Director

Following the MBO Ellis joined us in 2017, his vast knowledge of the Construction Industry is a real asset to the company. He oversees all projects no matter how big or small and ensures they are all on track with our Construction Team.

Elissa Thomas

Managing Director

Elissa became our Director in 2017, she has worked in the industry for over 30 years and now oversees all projects and ensures the office runs smoothly and effectively.

Mark Collier

Sales manager

Mark handles all sales & hire enquiries. He has over 20 years experience in the Modular Building industry ensures he has the best knowledge to capture all your needs in our Modular Buildings.

Kevin Jones

Operations manager

Kevin has worked for us for over 35 years. He keeps every project on track and makes sure progress is going in the right direction to the highest standard.

Jan Draby

Account Supervisor

Jan looks after the numbers and will make sure the figures are all adding up.

Rebecca Thomas

Service Manager

Rebecca deals with all of our aftercare, after your building has been delivered, we will always continue to check that you are satisfied with your product. She also overseas all our marketing and helps promote our corporate image. Keeping all social media and our website up to date her creative expertise ensures our new modern look is portrayed throughout.

Barbara O’Reilly


Barbara will ensure that the project is stress free for all clients, no matter how big or small the job is.

Ellis John

Purchasing & Technical Manager

Ellis looks after all the purchasing here at Modex, he is also responsible for overseeing the development and implementation of new strategies.

Construction Team

Our dedicated and professional construction team are a mix of professional tradesmen and builders. With experience in electrical installation, heating & plumbing, carpentry and building - we have all the experience to build your building without outsourcing additional for skillsets.