Rationel FORMA and FORMAPLUS Traditional Doors

Designed to complement or enhance the numerous British house styles, Rationel FORMA and FORMAPLUS doors are a more classically styled option for the front, side or back of your home.  At the same time, this range of premium quality wood or alu-timber composite materials comes with 21st Century performance and security.  Whether you choose a welcoming front door or need stylish doors elsewhere in your home, Rationel FORMA and FORMAPLUS doors comprise the best design with a softer aesthetic and, above all, beautiful doors. Matching windows are available for a complete property look.

Their unique detailing characterises Rationel FORMA and FORMAPLUS doors, whether you choose them as fully glazed styles or with hand-cut and applied Georgian and astragal bars.  FORMA is the all-wood door option giving you sustainable luxury wood throughout.  FORMAPLUS offers an even longer service life with aluminium on the outside with added protection. There’s no door product better than wood or alu-timber for insulation, acoustics, interior comfort, and style.

Rationel FORMA and FORMAPLUS doors in a kitchen extension with original beams
  • Crafted, bespoke front and back doors
  • Excellent security and insulation
  • Meets 2022 Building Regulations
  • Double or triple glazed
  • Premium door furniture
  • Matching windows

Whether you choose all-timber or aluminium clad, both Rationel FORMA and FORMAPLUS are exceptional in their fit, finish, and overall build quality. The finest materials create beautiful doors, whether you choose fully glazed, solid or a combination of glass and panels. High-specification safety glass comes as standard, with all doors having top-of-the-line designer door handles.

Security, weather protection and interior comfort all come as standard with toughened or laminated safety glass, high-tech locks, a security cylinder and an internal glazing design. Rationel FORMA and FORMAPLUS doors are available as hinged single or double doors, inward-opening balcony doors, outward-opening patio, and sliding doors.

Low threshold options provide added accessibility and function. With over sixty years of pedigree, Rationel doors deliver exemplary design with genuine attention to detail.  Rationel is part of our overall range of alu-clad windows and doors for traditional or modern houses and commercial buildings.

Available in a comprehensive choice of designs, frame colours, glass and accessories, Rationel FORMA and FORMAPLUS doors are professionally installed by us and come with a quality guarantee. Sustainable, beautiful, long-lasting and desirable, Rationel FORMA and FORMAPLUS doors are a long-term investment in your home and are just as appealing in premier developments of housing or light commercial buildings.


Customise Your products

A personalised touch

Glass options

Contemporary designs that enhance security and privacy.

Integral Blinds

An attractive addition delivering privacy and shading when you need it.


Peace of mind starts when you get in touch and lasts for years.

steve arundellsteve arundell
13:43 02 Nov 23
Chris and Andy listen to what we wanted and their team then delivered in spades.Great company well worth the effort to contact.
ArBa InstallationsArBa Installations
22:23 20 Dec 22
Posting from the view of an Installations company, C & A have always been a pleasure to deal with. Their process is very thorough and products are top quality. We use them for all our commercial doors and would highly recommend all their products and them as a company.
Paul DillonPaul Dillon
14:17 23 Nov 22
Great service. Top products. Thank you. C&A
Alfie TonerAlfie Toner
13:43 21 Nov 22
Great company to deal withQuick quotesPleasant staffGreat productsGreat customer supportDefinitely recommend
22:50 12 Jun 22
Couldn’t recommend this amazing company enough from start to finish the professionalism have been second to none. The quality of the work undertaken shows how much C&A take pride in there work. Thank You again
Gary WoodhatchGary Woodhatch
11:11 11 Mar 22
Have been dealing with Andy and Kim in the main at C&A windows for a few months now and the service overall has been great, quick quotes, lead-times inline with expectations and well presented and packaged goods. Great responsive aftersales assistance when called upon. Would recommend C&A for sure.
richard newellrichard newell
07:44 11 Mar 22
Always a pleasure to work with the people at c and a, very good communication throughout the process and most importantly the product is excellent.Highly recommended.

Send us an email

Send us an email if you have any questions.


call us

Need to know more about our products? Call us, and a member of our sales team will help you.

01787 477976

visit us

Book an appointment to visit our showroom.  
8am – 5pm Monday – Friday

Unit 1, Lancaster Way
Earls Colne Business Park, Earls Colne, Colchester CO6 2NS

We are looking for new staff to join our team.