When it comes to making sure that your doors are sized correctly and abide by the Ontario Building Code, it is important to be aware of standard door sizes. You may be asking yourself, “How wide is a standard door?” Well, your question will be answered in this article as we outline standard widths and heights of doors for residential and commercial buildings, discuss how the material used may affect size, and explain how to properly measure your doorways.
Standard Door Size for Residential Buildings
Interior — The size for interior doors varies depending on the type of room. The standard bedroom door size is a width of 30 inches and a height of 80 inches. This is also standard for bathroom doors and closet doors. Larger rooms with higher ceilings typically have slightly bigger doors with a width of 34 inches and height of 84 inches to maintain a more spacious look and feel.
Exterior — Standard front doors are typically 34 inches wide and 80 inches tall, while double doors for a grander entryway are 72 inches wide and 80 inches tall. Sliding patio doors leading out to the backyard tend to have a width of 5 to 8 feet and a height of 80 inches.
Standard Door Size for Commercial Buildings
Just like doors for residential buildings, the standard door height for commercial buildings is 80 inches.
As for the width of the door, the minimum requirement is 34 inches to ensure that the opening is wide enough for easy and unobstructed access into the building in order to accommodate for wheelchair users.

How Materials Affect Standard Door Size
Perhaps you don’t have a regular door but instead have double doors. While some of the same steps can be taken, you’ll have to look at both sides to determine the swing and handing.
Final Thoughts
Throughout this article, we have outlined the standard door sizes for residential and commercial buildings, discussed how the material used can affect size, and explained how to properly measure your doors. At Delet, we offer door repair and replacement for both residential and commercial buildings, as well as 24/7 emergency repair services for whenever you are in need.
Our team is committed to ensuring that you have accurately sized doors that fit as they should. Contact us today!
FAQs
The standard height for all doors, whether interior, exterior, residential, or commercial, is 80 inches. For interior doors of residential buildings, such as for bedrooms, the standard width is 30 inches, whereas for exterior doors, like the front door, it is 34 inches. For the doors of commercial buildings, the standard is a minimum width of 34 inches.
Absolutely! A width of 30 inches is standard for bedroom doors with smaller and larger varieties depending on the size of the room as a whole.
Not necessarily. The standard for the width of front doors is actually 34 inches. However, that is just a starting point and having a front door that is 36 inches wide is also rather common nowadays. In fact, most prefabricated doors are available in that size so it is easy to get a front door that is 36 inches as long as it fits your house’s door opening.
For public, commercial buildings, the size of a standard door, whether interior or exterior, is 34 inches wide and 80 inches tall.
To meet accessibility requirements, all doors in commercial buildings need to be a minimum width of 34 inches. This is the size that at the very least provides enough space for wheelchair users to easily enter and exit the building without obstructions.