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The Traditional Rationel Range


Today, older and classic houses can also be refurbished to enjoy the advantages of energy efficient windows. Our FORMA range consists of all-timber windows with slim, non-continuous bars. The FORMAPLUS range is similar to the FORMA range, produced with the same solid timber construction. The only difference is that FORMAPLUS is provided with external aluminium cladding, ensuring minimum maintenance. This product range is also ideal for new build if a classic expression is desired.

FORMA and FORMAPLUS are available both with and without glazing bars to fit in with your design. Terrace and entrance doors with glazing and wooden infill panels are also part of the range. They are easy to join in multiples and therefore suitable for complex window solutions.

Product Details

Can be supplied with trickle vents.

Adjustable hinges - keeps the windows tight.

Angled glazing bead

Chamfered internal profile / Slim 25 glazing bar option

Opening Functions

FORMA/FORMAPLUS windows and doors are available in a variety of opening designs to suit your lifestyle and the character of your home.

Our units can also be combined to create impressive expanses of glazing, complex patio door configurations or conservatories.

Fixed light

Topguided window

Sidehung window

Topswing window

Sideguided window

Entrance door

Panelled door

Window door

Terrace door


Sophisticated Colours

 We offer a standard range of sophisticated colours to complement the modern architectural profiles of FORMA/FORMAPLUS as well as subtle Granite tones specifically for FORMAPLUS.

RAL 9010

Creme White
RAL 9001

Light Grey
RAL 7035

Slate Grey
RAL 7015

RAL 7016

RAL 9005

Silver Grey
RAL 7001

Dark Brown
RAL 8017

Olive Green
RAL 6003

Navy Blue *
RAL 5013

RAL 3011

Mid Grey
RAL 7042

Pebble Grey
RAL 7032

RAL 1001

Beige Grey *
RAL 7006

Yellow *
RAL 1018

Dark Green
RAL 6007

Blue Black
RAL 5008

Clear Lacquer
(FORMAPLUS Internal only)

* Will be subject to additionel lead-time

Granite Colours (Only for FORMAPLUS)

SAA10F Sablé

2150 Sablé

2400 Sablé

2900 Sablé

2100 Sablé

900 Sablé


Special Colours

For an additional cost, you can also choose any non-standard RAL-colours to enhance your project.

Note: we cannot guarantee a precise colour match with the above examples, so it is important that you use genuine RAL colour cards when making your selection.




For FORMA and FORMAPLUS, you can choose from a wide selection of energy efficient panes, depending on the function of the window in your home.

Discover our full range of customised glazing options here:

Rationel OBSCURE

Rationel SOLAR

Rationel SOUND

Rationel SECURE

Rationel FACADE

Rationel SAFETY


Click to read more about panes


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