STANDARD SIZES OF DOORS, WINDOWS AND VENTILATORS | FRAME SIZES | FIXING SIZES

STANDARD SIZES OF DOORS, WINDOWS AND VENTILATORS

What is the standard size of the door, windows and ventilators?

The dimensions of doors, windows and ventilators are measured inside to inside of openings and designated by letters such as 8DS20, 10 WT12 and 6V6. In this designation, the first number indicates the width of the door opening in modulus of 100 mm (10 cm). Thus 8 means 800 mm. The first letter D denotes door, W windows and V ventilator. The second letter S denotes single and T double shutters. The last number indicates the height of the opening in modulus of 100 mm. Thus 20 means 2000 mm (2 m). The standard sizes of openings according to IS are given in the Tables below

 

In a building, the top of the doors and windows are placed at the same level. Hence, the window's height will depend on the height where we want to fix the window sill to ensure circulation inside the building. The width of windows will depend on the openings required. In places such as kitchens, windows are generally provided above the level of the kitchen platform. Fixing the height of doors and windows is explained below

 

Standard dimensions of timber door frames

S.No.	Designation	Size of opening	Size of wood frame (width and height)	Size of door shutters
1.	8 DS 20	800 x 2000	790 x 1990	700 x 1905
2.	8 DS 21	800 x 2100	790 x 2090	700 x 2005
3.	9 DS 20	900 x 2000	890 x 1990	800 x 1905
4.	9 DS 21	900 x 2100	890 x 2090	800 x 2005
5.	10 DT 20	1000 x 2000	990 x 1990	900 x 1905
6.	10 DT 21	1000 x 2100	990 x 2090	900 x 2005
7.	12 DT 20	1200 x 2000	1190 x 1990	*1100 x 1905
8.	12 DT 21	1200 x 2100	1190 x 2090	* 1100 x 2005

* Doors with two shutters 560 mm each shutter and 20 mm overlap when closed.

 

What is 8 DS 20?

In the designation 8 DS 20, the letter D stands for  The designation 8 DS 20 denotes a door opening with a single shutter where the letter D stands for door opening and the letter S stands for the single shutter. It tells that the width of the door opening is 8 modules i.e. 800 mm and the height is 20 modules i.e. 2000 mm.

Standard dimensions of timber window frames (mm)

S.no	Designation	Size of opening	Size of wood frame (width and height)	Size of window shutters (wood)
1.	6 WS 12	600 x 1200	590 x 1190	500 x 1100
2.	10 WT 12	1000 x 1200	990 x 1190	460 x 1100
3.	12 WT 12	1200 x 1200	1190 x 1190	560 x 1100
4.	6 WS 13	600 x 1300	590 x 1290	500 x 1200
5.	10 WT 13	1000 x 1300	990 x 1290	460 x 1200
6.	12 WT 13	1200 x 1300	1190 x 1290	560 x 1200

 

 

Standard dimensions of timber ventilator frames

S.no	Designation	Size of opening	Size of wood frame (width and height)	Size of window shutters (wood)
1.	6V6	600 x 600	590 x 590	500 x 500
2.	10V6	1000 x 600	990 x 590	900 x 500
3.	12V6	1200 x 600	1190 x 590	1100 x 500

Note: The thickness of the shutters is 20, 25 or 30 mm depending on the size of the opening.

FIXING SIZES AND HEIGHTS OF DOORS AND WINDOWS

How the sizes of doors and windows are fixed?

Generally, the height of doors (as defined in Section 23.3) is kept not less than 1950 mm (6 ft 6 in) in residences and 2.1 m (7 ft) in public buildings from the floor level. We have already seen that the top levels of doors and windows are always kept at the same height. The sill or bottom part of windows is usually kept at 700 mm (2 ft 4 in) to 800 mm (2 ft 8 in) above the floor level. In some places such as drawing rooms, window sill may also be fixed at lower levels. Bay window sills are usually kept at a low level—at about 500 mm (1 ft 8 in). The size of windows will, therefore, depend on these dimensions.

 

Considering the width of doors, we note that as all modern furniture has a minimum dimension of 750 mm (2 ft 6 in), the minimum width of door openings should be at least 800 mm (2 ft 8 in). Thus the minimum size of main doors should be 8DS20 doors to stores, bathrooms, etc. may be smaller in width by 675 mm (2 ft 3 in), which is less than the standards specified.

What is the Standard size of doors for residential homes? 

When we plan a building such as a residence, we try to keep the width of the various door openings of the main building to be not more than the following three sizes:

 

(i) Entrance doors: 1200 mm x 2100 mm (4.0' x 7.0') or 1000 x 1950 mm (4' x 6'6")

 

(ii) Internal doors: 900 x 2100 (3.0' x 7.0') or 900 x 1950 mm (3' x 6'6")

 

(iii) Doors for bathroom, stores, etc.: 750 x 2100 (2'6" x 7.0') or 750 x 1950 mm (2'6" x 6'6")

 

It is also very important to remember that if we are using flush doors, the openings and the frames we are planning must suit the commercial flush door shutters that are available in the market.

Also read: Building Bye Laws, Standard Dimensions of Building & Tips For Civil Engineer

 

SIZES OF TIMBER TO BE USED FOR DOORS AND WINDOWS

Timber doors and windows are more popular than other types of residences. The sizes of timber scantlings adapted for doors and windows should be of reasonable size as otherwise, they will quickly get out of shape. The following sizes of timber are recommended for doors of 2.1 m in height.

 

Doors

The sizes of timber to be used for the various parts of a panel door are given in the table below

Table: Timber sizes for panelled doors

Part of panel door	Timber sizes (sections)
Frames	For single shutter frame: 100 mm x 65 mm For double shutter frame: 130 mm x 65 mm
Panelled shutters	For styles: 75 mm x 50 mm For top and intermediate rails: 75 mm x 40 mm For lock rail: 125 mm x 40 mm For bottom rail: 150 mm x 40 mm
Panels (planks)	For single leaf: (1.0 m x 2.1 m) 15 mm thick For small panel: 12 mm thick

(Panels can also be moulded from wood planks or made from plywood.)

 

Windows and Ventilators

The sizes of timber to be used for the various parts of windows and ventilators are given in the table below

Table: Timber sizes for windows and ventilators

Part of window	Timber sizes
Frames (windows and ventilators)	For up to 1.2 m width: 75 mm x 60 mm For more than 1.2 m width: 100 mm x 60 mm
Panels (styles and rails)	For window styles and rails: 75 mm x 35 mm For ventilator styles and rails: 60 mm x 35 mm
Panels (planks)	For planks for the panel: 12 mm thick For glazing bars: 40 mm x 35 mm

Also read: Standard Sizes of Doors, Windows And Ventilators | Frame Sizes | Fixing Sizes

Standard Door Width & Length Guide

Recommended Opening Sizes – 'Doors'