Here's our standard interior door size guide including the most common door dimensions for the bedroom, bathroom and closets. The height of the door is its most standard dimension. All interior doors that will be used as passageways between rooms should be at least 80 inches tall. (6'8) This allows adequate room for the vast majority of people to use the doorway without bumping their heads.
Closet and utility doors, which are not used to travel between rooms, can be shorter. 78 inches (6'6") is a very common height for closet doors.
What Is The Standard Interior Door Size?
Standard widths for different types of interior doors can be anywhere between 24 inches and 36 inches. The most common width for interior doors is 32 inches. So the standard interior door size is 32″ wide by 80″ high
Most people can clear a doorway of this size without brushing the sides of the frame. If you want your home to be accessible to wheelchair users, every door must be at least 36" wide.
Standard Interior Door Thickness
The most common thickness for interior doors is 1⅜". Other door thicknesses are available, such as 1½", 1⅝", and 1¾". Oversized or especially large doors (more than 90 inches tall or more than 36" wide) are usually thicker than standard-sized doors.
The thickness of the door becomes important when you are ordering hardware, such as doorknobs and hinges. Fire doors are also thicker than regular interior doors.
How to Measure a Door
Doors are one of the finishing touches added to new construction, but you can't wait until the final stage of the project to think about them. The eventual size of the door is established during the framing process.
Contractors erect studs to form a 'rough opening' between rooms and make it strong enough to support a door and door frame.
The rule of thumb for rough openings is: they should be two inches wider than the door that will eventually be installed. This allows room for the door frame and leaves a small gap at either side of the door, allowing it to be opened and closed.
As far as height is concerned, the rough opening needs to be an at least two and half inches taller than the door. If the flooring is very thick, the opening may need to be even taller so that the door can swing freely.
Once you've got the rough opening, your next step is to add a door frame and hang a door, or install a pre-hung door.
Before you take the final step of ordering your doors, make sure you measure the size of the actual rough opening — don't take the measurements on the plan for granted.
To calculate the appropriate size for a replacement door, professionals recommend you measure the doorway (the opening where the door will hang) rather than the existing door.
This is because wood (in either the door or the door frame) could have warped or changed shape in response to weather. You'll also need to establish the desired thickness of the replacement door.
Door Width and Height
To measure what width of the door you will need to order, stand in front of the current door, so that it opens away from you. Open the door and prop it open if necessary, so you don't pinch your fingers in the hinges.
Put one end of a tape measure against the inside of the door frame, and extend it across the door opening to the other side of the frame. The tape should be parallel to the floor.
Take three measurements — one towards the very top, one at the very bottom, and one roughly in the middle. Whichever distance is the widest of those three is the first measurement you'll need to order your new door.
The next measurement you need is the height of the doorway. As when measuring the width, stand in front of the door and open it away from you.
Hold the tape measure perpendicular to the floor and run it along each interior edge of the door jamb.
These two measurements should be exactly the same. If they are very different, you should consult a professional, as this could indicate an underlying structural problem.
Door Thickness
For the last measurement, the door's thickness, you can use the existing door. Run a tape measure along the edge of the door in several places and record the measurements.
This is especially important to get right if you want to reuse the hinges or door knob, as these pieces of hardware are designed based on the thickness of the door.
Interior Door Sizes
The International Residential Code provides uniform standards of safety and accessibility for one- or two-family dwellings and townhouses. This is what the home inspector will reference when they come to sign off on your new home, in addition to any local codes.
While there are strict requirements for the main entry to a home, interior doors are neither required nor regulated. Where they exist, they simply need to be in good working order and installed according to the manufacturer's specification.
Standard Bedroom Door Size
There is no standard size specific to bedroom doors. Like other interior doors, they are generally 32" wide and 80 inches high. The typical thickness is 1 ⅜".
Interior Double Door Sizes
Double doors are two doors that hang next to each other, creating a double-wide entry or exit into a room or hallway. The most common widths for a pair of double doors are 60", 64" and 72".
The standard door height of 80" still applies. There is no standard thickness for an interior double door.
The taller and wider the door is, the thicker it will need to be in order to support it's own weight. Both doors must be the same width, height, and thickness. Both doors open in the same direction.
Standard French Door Size
A 'French' door is made up of a thin/light frame that surrounds panes of glass. The panes of glass typically make up the majority of the door's surface area. They are often, but not always, hung in pairs.
If hung in pairs, both doors must be the exact same size and thickness. There is no standard door size for a French door. The smallest French doors are around 30 inches, and they can be found in 2" increments all the way up to 72 inches.
Standard Closet Door Size
International Residential Code does not regulate or standardize closet doors. The only limitation is the size of the rough opening. Closet doors are usually 30 inches wide by 80 inches high.
Many closets use bifold doors — these doors fold in on themselves rather than swinging out into the room. Usually, each panel of a bifold door is 24" wide. See more closet door sizes here.
Standard Bathroom Door Size
A bathroom door needs to adhere to the same standard size considerations as any other interior door. It should be at least 80 inches high, and 24-36" wide. The thickness and design of the door should match it's door frame.
Standard Front Door Size
A front door is an exterior door, meaning it serves to connect the inside of your home with the outside. The International Residential Code requires the main entrance to a house to be, at minimum, 80 inches tall and 36 inches wide.
(Side doors or back doors can be smaller; 28", 30", and 32" are the most common widths for these doors.)
Exterior doors have the additional responsibility of sealing your home against the elements, and maintaining the temperature inside. For this reason, they are usually a little thicker than the average interior door. The average thickness of a standard front door is 1¾"
Interior Door Sizing Considerations
Making decisions about interior doors is hard, because you'll have to live with the results of your choices for as long as you own the home. It's difficult and time consuming to go back and make a doorway larger or smaller, and it isn't always possible.
All the interior doors in your home should be the same style/design. If you have non-standard doorways, make sure you pick a door that is available in all the sizes you need.
The least expensive interior doors are those that come in common sizes, so it makes sense to choose these for the majority of rooms.
If you plan to grow old in your home, or currently experience mobility challenges, consider making all the doors 36" wide. This choice will ensure you can still navigate your home should you need to use a walker or wheelchair, and that your home is accessible to all guests or future owners.
Finally, consider the finish of your interior door. Does it need to be stained or painted? Two coats of primer and two coats of paint can add as much as 1/32" to each edge of the door. Talk to your contractor about this, as it may affect the size of the rough opening that is needed.
Standard Door Frame Size
Door frames are the pieces of wood that will support the door, and are installed into the rough opening. Hinges are then used to connect the door to the door frame. There is no standard, but the most common door frame size in the US is 36 inches wide and 80 inches tall.
Prehung Door Sizes
Pre-hung doors come with hinges already attaching the door to a frame. The door's frame simply needs to be nailed into the studs around the rough opening, and then finished with trim.
This solution is popular with DIYers, for good reason. Hanging a door takes a certain amount of patience and finesse, and even professionals can struggle with it. Buying a pre-hung door takes all the guesswork and skill out of the equation.
Prehung doors are almost always 80 inches tall. They usually come in two standard widths — 30 inches and 36 inches. Additional sizes in non-standard widths are absolutely available, they are just less common.
Selecting an Interior Door
Interior doors can be plain and simple, or highly decorated. Choose a door that supports or enhances the architectural style of your home rather than it's current decor.
Tastes change over time, but doors last a long time and are not usually part of redecorating, so you want to make a choice that will look good for years to come.
When comparing doors, consider three things; materials (what the door is made from), functionality (how will the door be used) and cost (remember to consider both materials and labor!)
Door Materials
The most common choice of material for interior doors is wood. The least expensive doors have a hollow core and are constructed of wood or fiberboard.
Doors of solid wood are also available. Other materials for doors include glass, stainless steel doors, fiberglass, and aluminum.
The material and style of your door should coordinate with the overall style and feel of your home. For example, a sleek, fiberglass door could look perfect in a modern home, but would be out of place in a more traditional cottage.
Door Functionality
When choosing a door, consider what role it will play in your home. Doors provide both a visual and physical barrier to a room and preserve privacy.
They can also provide sound isolation and dampening. Many homeowners prefer to install thicker doors on bedrooms or home offices for this reason.
Think about how you want the door to move. Should it open into the room, or out? Should it be hung on the left or right side of the door frame? Maybe you want to forgo a swinging door altogether and go with a sliding door.
In that case, is there enough room to the side of the rough opening to slide the door fully open? Read more about sliding door sizes here.
Interior doors that connect a room with a hallway usually open into the room, as this minimizes the chance of a collision with someone walking by. When an interior door connects two rooms, without a hallway, the direction that the doors swing is determined by convenience.
Door Cost
For a single door, expect to pay between $50-500 for the door itself. If you're hanging it yourself, the only additional cost is your time.
If you choose to have a professional install it, expect to pay $100-300 per door, depending on your location and the complexity of the door.
Pre-hung doors are usually slightly more expensive to purchase, but can be cheaper to install.
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