- What is the Standard Size of an Interior Door and How to Measure It
- Understanding Commonly Used Terms When Describing Doors and Measurements
- Measuring Existing Interior Doors
- Different Standard Sizes of Internal Doors Available
- Choosing a Door That Will Fit in Your Space Accurately
- Frequently Asked Questions About Standard Size Interior Doors
What is the Standard Size of an Interior Door and How to Measure It

The standard size of an interior door is a topic of some debate among builders, architects and other professionals in the construction industry. Generally speaking, the most commonly accepted standards for interior door sizes range from 28 inches to 36 inches in width, with heights ranging from 80 inches to 96 inches. However, these are merely guidelines and do not take into account custom-made or special-order doors. As such, it is important to always consult your contractor or building specs if you need exact measurements for construction purposes.
When measuring a standard interior door for purchase or installation, there are three main measurements that should be taken into account: width, height and thickness. The width measurement should be recorded at the bottom of the door on both sides—usually ranging from 28 inches to 32 inches (77 cm to 81 cm). The height measurement should be recorded on both sides as well—typically reaching anywhere from 80 inches to 96 inches (205 cm to 246 cm). And lastly, the thickness is generally measured by subtracting 2 7/8” to 3 ¼” (7 cm to 8cm) off of the height measureadment—as this will provide a proper estimate of the actual door’s thickness once hung on its frame.
Most importantly though, when replacing an existing interior door make sure you measure all three measurements accurately before making any purchases; otherwise you may risk purchasing one that does not fit properly in your doorway!
Understanding Commonly Used Terms When Describing Doors and Measurements

Doors come in a wide variety of shapes, sizes, and styles. The terms used to describe them can be confusing for someone not familiar with the terminology. Here are some of the more common door-related terms you might run into when buying or discussing doors and their measurements:
Head – This refers to the top part of the door which is usually wider than the width of the rest of the door.
Jamb – This is comprised of two vertical pieces either side and one horizontal piece at over or under head that connects them together and forms a frame around a doorway; its width measures the same as your doorway opening.
Leaf/Panel/Mullion – This term commonly refers to the main rectangle found at center front side view, can also be used for any individual component that creates up an overall design on a door (i.e., lite frames boxes, etc).
Rough Opening – Refers to an unfinished opening in stud or masonry wall into which a new window or door is installed. It’s usually bigger than necessary so there is enough area to attach framing components like jamb members, sill and header 2×6’s before installing trim materials around finished windows or doors such as casing / reveals etc..
Threshold – A long flat piece that bridges across bottom portion of an entrance way sitting atop sub flooring material with either raised drip edge intended hamper water coming inside structure during rainy periods or recessed indentations primarily serving as screed funnel lower portions after completion installation process i.e., adjust height points make fit w/ flooring etc.. also hangs on lip cased sub base when attached offering ideal appearance along w/ enhanced function for security purposes & this component often has replaceable threshold seals replaced easily if needed sometime down line versus full tear out involved if wood product used instead here
Lite Framebox – Where glass panels are fitted within creating glazed window device cent
Measuring Existing Interior Doors

Measuring existing interior doors is an important task when considering any type of replacement. The goal of measuring existing doors is to find the right fit that will work seamlessly with the rest of your interior design aesthetic. This can be done in a few easy steps:
1. Measure the width of one side of the door, starting from the sides or edges of the frame and ending at approximately 2″ away from the edge of the door itself. Do this on both sides (if you are able to) to ensure accuracy, particularly if you’re measuring older doors that may have shifted over time due to wear and tear.
2. Now measure from one side all along the top and bottom, taking care not to miss anything such as handles, locks or hinges protruding outwards. Again, measure both sides for accuracy if possible.
3. Finally, measure how tall you need your new door to be by having someone stand next to it with their arm at a 90-degree angle pointed toward the ceiling – record this measurement exactly and also take note if there are any elements sticking out from either side that may affect your final selection (or even require a custom order).
By completing these three steps properly – not forgetting any small details until it’s too late! – you’ll be well on your way to picking out just the right size door for whatever project you have in mind!
Different Standard Sizes of Internal Doors Available

The range of available internal door sizes varies depending on a variety of factors, but standard door heights are usually 81.5″ or 79″ and the widths can range between 24″ or 36″. You may also see sizes such as 78 3/4″, 81 1/8″, 28″, 30″, 32″ or 34″.
In most cases, there is something called a nominal door size – which is really just a standardized number that manufacturers use when providing rough measurements for doors. For instance, if you wanted to buy an interior double door that size could be expressed in nominal terms as “2×6’8”. The real measurement of this door would actually be 78 3/4” wide x 81 ¼” high (despite being referred to as 6 8′).
When shopping for an internal door replacement it’s important to keep in mind not only the opening size but also any obstructions like trim moldings that could affect the overall dimensions. Ideally, you should take exact measurements of your existing doorway before deciding on a new internal door. This will help to ensure that you end up with the perfect fit so it won’t stick out awkwardly from the frame or cause any other problems once installed.
No matter what type of room or house you have, there will always be some sort of standard internal door size ready-made and ready to purchase. Just make sure that you measure carefully first – and don’t forget about any potential obstacles like window frames or furniture – before making your final decision!
Choosing a Door That Will Fit in Your Space Accurately

It can be tricky to install a door in your home that fits perfectly with the space it is going into. Each doorway differs in width, height, and often even angle, so selecting the right door is essential. Here are some key tips to consider when shopping for a new doorway fit.
1.) Measure the width of your existing doorway twice to make sure you have the most accurate dimensions possible. Make sure to note any irregularities such as an angled shape or uneven sides, as this can affect which types of doors will work best for you.
2.) Consider the expected traffic flow for your new door and select one that doesn’t restrict movement or hinder accessibility. If you need extra room to move around then consider double doors or swinging barn doors rather than traditional hinged options.
3.) Doors come in all sorts of materials from solid construction wood to lightweight models made of composites and PVCs – choose whichever type meets both form and function needs best while factoring in the weight they’ll need to sustain. A balanced mix between strength and sturdiness must combine together comfortably if you plan on using your new purchase heavily over time!
4.) Finally, make sure to factor in any hardware components when measuring and purchasing a new door like doorknobs or levers which can add additional inches depending on their design – while making certain they match up visually with nearby items as well! This way you’ll be able create a seamless look without having gaps showing throughout the area in question.
By keeping these four factors in mind, you can be sure that your quest for a perfect-fitting doorway doesn’t end with anything less than success! With careful selection and precision measurements, finding yourself just the right fit is only a few steps away.
Frequently Asked Questions About Standard Size Interior Doors

Standard size interior doors have been a mainstay for residential construction for decades. As such, there are a number of common questions surrounding their dimensions, installation, uses and more. In this article, we’ll discuss some of the most frequently asked questions about standard size interior doors to provide clarity and help you determine if they’re the right choice for your particular situation.
Q: What are standard size interior doors?
A: Standard size interior doors typically measure six feet eight inches in height and come in three widths: 28 inches, 30 inches and 32 inches. These measurements do not include any trim or hardware which will add to their overall design dimensions. They are generally sold pre-hung (with frame attached) allowing for easy installation as well as quality assurance that all pieces fit together smoothly.
Q: What is the purpose of having standard sizes?
A: Having standardized sizes simplifies the purchasing process, making it easy to find door styles from various manufacturers that will fit the same opening without having to custom order each door individually. This also helps reduce costs since customers can purchase from mass production suppliers with bulk discounts instead of paying much higher prices for customized orders. Additionally, having standardized sizes allows for better coordination between contractors and builders who know exactly what sizes will be needed ahead of time without any guesswork or extra measurements being required onsite during installation.
Q: How do I know if a standard size door is right for me?
A: Calculating whether or not a standard-sized door will fit in an existing opening requires measuring both the height and width of what’s already installed. The new pre-hung door should have no more than half an inch (1/2″) total difference between it’s height/width measures and those already present in your doorway’s framing otherwise it won’t be possible to install it successfully without modifications being made first such as moving electrical wires or removing wall studs entirely in