If the world of home improvements is new to you, getting your head around some of the technical terms for doors can be difficult.
To make the process as smooth as possible, we’ve put this helpful list of terms together for you.

If there’s a term we haven’t covered, don’t hesitate to contact us and we’ll be in touch soon.

bifold door handle


Aluminium is a popular material used to manufacture windows and certain styles of doors. They’re most commonly used for bi-fold doors as they’re incredibly strong and able to hold much larger panes of glass.

Bi-fold doors

Bi-fold doors are made from panels of glass that can be folded in a concertina style and neatly stacked to one side.

Bright blue composite entrance door with gold hardware

Composite doors

Composite doors are manufactured by combining a selection of materials to create a high performance, durable door. They feature either a foam or timber core and are wrapped in a GRP skin.


Door set energy rating or DSER is the rating given to your door before installation, this will make you aware of how energy efficient your product is.

uPVC Sliding Doors


FENSA is a government-authorised scheme that ensures building regulations are met and upheld throughout a home improvement project, after having work completed by a FENSA certified installer you will receive certification as proof.

French doors

French doors feature either two panes of glass or two solid panels that open either inwards or outwards, often found leading out to patios.

green french doors selecta


Glass-reinforced plastic or GRP is the coating applied to the exterior of a composite door to enhance its abilities. GRP will prevent rotting, warping and damage.

Multi-point locking

Multi-point locking systems feature on replacement doors and windows and act as an additional security enhancement.

Composite Doors

PAS 24

The publicly available specification or PAS are the minimum-security standards that all home improvement products need to meet before being installed.

RAL colour

RAL is the most popular European colour matching standard for powder coating, plastic paints and varnish.


Safety glass

Often known as toughened glass, safety glass can be applied to any glazed area for additional safety and security, it is most commonly found in commercial buildings.


Sidelights are two small windows or panes of glass that sit on either side of the door, these are often decorative or obscured.

Sage green upvc front door
white patio doors selecta

Sliding doors

Sliding doors are made up of two large, glazed panels, one which is fixed in place and the other freely slides over it.

Stable doors

A stable door is split into two panels that together can operate as a normal door. What makes them different is the ability to freely open the top panel whilst leaving the bottom closed.

selecta composite door


A toplight is a pane of glass that sits above the door, they’ll often be decorative or obscured glazing. It’s becoming popular to have your house number sandblasted into the glass panel.


Unplasticised poly vinyl chloride or uPVC is a strong and very popular material used for all home improvement products. uPVC provides you with full customisation opportunities.

white front door

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