As a civil engineer or construction professional, having a solid grasp of standard sizes of doors, windows and ventilators | frame sizes | fixing sizes can make a significant difference in your project outcomes. This detailed article covers all the key aspects that every site engineer and civil engineering student should be familiar with.
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 |
Designation
Size of opening
Size of wood frame
(width and height)
Size of door
1000 x 2000
1000 x 2100
1200 x 2000
1190 x 1990
*1100 x 1905
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 |
Designation
Size of opening
Size of wood frame
(width and height)
Size of window shutters (wood)
1000 x 1200
1200 x 1200
1190 x 1190
1000 x 1300
1200 x 1300
1190 x 1290
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 |
Designation
Size of opening
Size of wood frame
(width and height)
Size of window shutters (wood)
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.
(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
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 |
Part of panel door
Timber sizes (sections)
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 |
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
Standard Door Width & Length Guide
Recommended Opening Sizes – ‘Doors’
Conclusion
Understanding standard sizes of doors, windows and ventilators | frame sizes | fixing sizes is a fundamental part of becoming a competent civil engineer. We have tried to cover every important aspect in this article so you can confidently apply this knowledge in real-world construction scenarios. Stay tuned to CivilNotess for more valuable content tailored for civil engineering professionals.
❓ Frequently Asked Questions (FAQ)
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