You should understand the standard door frame width properly as it is related to door shutter width.
Let’s understand some terms first related to this issue for better understanding the standard door frame width.
Door shutter width: This is somehow the clear opening of a door. That means, it is the inner width of a door frame.
Door frame width: Door frame width is the outer width of a door frame.
Door rough opening width: Door rough opening is the opening we keep on a wall to fix a door frame. So, the width of opening in a masonry wall to be fixed a door frame is the width of door rough opening.
Now let’s take a look at a door frame.
Anatomy of a door frame
A door frame consists of three parts. Two Jambs and one Head.
Jamb: Jamb is a vertical part of a door frame. A door frame has two Jambs.
The length of a jamb is normally 84“. And the cross-sectional dimension of a jamb is normally 6” x 2½”.
But if you plan to fix tiles in a wall then the cross-sectional dimension of a Jamb should be 6½” x 2½”. For example, bathroom wall and kitchen wall.
Read More: What to Check in a Wooden Door Frame?
Head: Head is the horizontal part of a door frame. A door frame has one head.
The length of a head should be same as the width of a door frame. And the cross-sectional dimension of a head should be same as the cross-sectional dimension of jamb for the particular door frame.
As you now know about the door frame particularly, let’s move on to understanding Standard door frame width.
What should be the standard door frame width
In architectural drawing, we commonly see the door width as below –
For Bedrooms – 40”
For Kitchen – 36”
For Bathrooms – 30”, etc.
Let’s take a bathroom door for the sake of our example which is 30” width.
So the width of the door frame for the bathroom will be 30”.
Let’s see what will be the door shutter opening width for the door.
Jamb thickness = 2 x 2½“ = 5”
Bit thickness for fixing door shutter in both Jambs = 2 x ½” = 1”.
So, the door shutter opening width will be,
= 30” – 5” + 1”
The available door shutter size in the market is 24”, 27”, 30”, 33”, 36”, etc.
So, if you keep the door shutter opening 26”, you won’t face any problem fixing 27” width door shutter. Because, if the door shutter opening is increased for some reason (straightening, sandpapering, etc) and the door shutter width is reduced for some reason (straightening, etc.), you will be able to fix the door shutter in the door shutter opening.
But there is a problem with 40” wide door. The bedroom doors are often shown in the architectural drawing as 40”.
Let’s calculate the required door shutter width for the 40” wide door.
Required door shutter width for the 40” wide door frame is,
= door frame width – 2 x jamb thickness + 2 x bit thickness.
= 40” – 2 x 2½“ + 2 x ½“
The available door shutter width in the market for the door is 36”.
But, if you take some portion from Jambs and some portion from door shutter for straightening and sand papering purpose, you won’t be able to fix the 36” wide door shutter in the opening.
So, although the door width is shown in the architectural drawing as 40”, you should use the 39” width door frame for bedrooms.
So, the standard door frame width depends on the available door shutter width in the market.
When we talk about the standard door frame width, we actually talk about the standard door width.
Although some codes are discussed on the standard door size, I’m not talking about those codes.
But, we normally use standard door width for various types of rooms in an apartment as following –
main entrance door – 45”
Bedroom Door- 39”
Bathroom – 30”
Kitchen – 36”
Kitchen veranda and servant toilet etc – 25”.
Keep in mind that you will also find a readymade door in the market which is combined with the door frame and door shutter. Thus you don’t need to calculate all these things.
However, standard door frame width depends on the width of door shutter. So, whatever door size is shown on the drawing doesn’t matter, you should check which door shutter width you will be able to provide.
Share Your Expertise
What do you think? What should be the standard door frame width? Please share your opinion in the comment below…