Door Sizes – The terminology explained…….

Imperial (Feet & Inches) Imperial (Inches only) Metric (mm)
6’6” x 1’6” 78” x 18” 1981 x 457 mm
6’6” x 1’9” 78” x 21” 1981 x 533 mm
6’6” x 2’0”  78” x 24” 1981 x 610 mm
6’6” x 2’3” 78” x 27” 1981 x 686 mm
6’6” x 2’6” 78” x 30” 1981 x 762 mm
6’6” x 2’9” 78” x 33” 1981 x 838 mm
6’8” x 2’8” 80” x 32” 2032 x 813 mm

Standard thickness of Imperial internal doors is 35mm although this can be different regionally, particularly in N.I

Metric Size Doors (mm)

2040 x 526 mm
2040 x 626 mm
2040 x 726 mm
2040 x 826 mm
2040 x 926 mm

Fire doors

In certain circumstances and if you are having substantial refurbishment work carried out then you may need to install Fire Doors. Fire Doors are usually the same size as standard doors although if you are replacing an existing door it is good practice to check as sometimes larger doors are used for access. The decision as to whether you need fire doors would be made by the building control officer working with your builder or architect.

The terminology describing fire doors relates to the amount of time it takes for the door to hold back the fire, so the terms FD30 relates to 30 minutes and FD60 relates to 60 minutes.

IMPORTANT : Fire Doors will only work if installed into a suitable fire door frame with an intumescent strip!

Bi-Fold Doors

This is where two door panels are hinged together to allow the doors to fold, this results in the doors protruding far less into the room. This is ideal is space is at a premium.