door casing sizes

Ultimate Guide to Door Casing Sizes Choices

Door casing, or trim, is an essential element of any home. Not only does it serve a functional purpose, but it also adds to the overall architectural beauty. With customizable options, door casing can be tailored to fit different styles and preferences. In this guide, we will explore the various door casing sizes and options available, helping you make the ideal choice for your home.

Key Takeaways:

  • Door casing plays a vital role in enhancing the architectural beauty of a home.
  • It is typically composed of three separate pieces: two long side pieces and one shorter head casing.
  • The most common door casing width is 2-¼ inches.
  • Materials used for door casing include paint-grade wood, hardwood, and MDF.
  • Door casing can be installed using simple carpentry techniques, making it a great DIY project.

Understanding Door Casing Designs

When selecting doorway casing, homeowners have a wide variety of options to choose from. They can opt for simple trim with a flat surface or more elaborate options with intricate moldings. Two major considerations when choosing a style are joint choice and sizing.

Many builders prefer mitered joints, where matching trim pieces connect at equal angles in the top corners. This creates a clean and seamless look, perfect for adding a touch of sophistication to any room. On the other hand, butted joints are characterized by a wide head casing that rests on the flat tops of the side casing boards. This style is often used in designs for homes with high ceilings, as the wide head casing draws the eye upward and adds an element of grandeur.

Doorway casing trim typically comes in a range of widths, allowing homeowners to select the perfect size for their needs. Common widths range from 2-¼ inches to 3-½ inches, with wider options requiring custom orders. By choosing the right joint style and sizing for their doorway casing, homeowners can create a look that complements their personal style and enhances the overall aesthetic of their home.

types of doorway casing

Whether you prefer a sleek and modern look or a more traditional and ornate design, door casing is a versatile option that can elevate the overall appearance of any room. The next section will delve into the different materials used for door casing, providing insights on how to make the right choice for your home.

Door Casing Materials: Make the Right Choice

When it comes to selecting the perfect door casing material, several factors come into play, including style preference and budget. There are various options available in the market, each with its own unique characteristics and advantages.

Paint-Grade Wood Casing

Paint-grade wood casing is a popular choice among homeowners. It offers the flexibility to paint the trim and match it to the interior decor. Paint-grade wood casing comes in various widths, allowing for customization to suit different design preferences. It can be purchased as bare wood or primed, making it easier to achieve the desired finish.

Hardwood Casing

For a more durable option, hardwood casing is an excellent choice. While it may be more expensive than other materials, hardwood casing provides a clean and seamless finish without any visible joints. It is particularly ideal for areas with exposure to moisture or when staining the molding is desired. Hardwood casing adds a touch of elegance and sophistication to any room.

Multi-Density Fiberboard (MDF) Casing

If budget is a concern, multi-density fiberboard (MDF) casing is a cost-effective alternative to wood casing. Made from sawdust and resin, MDF casing offers a wide range of design options to suit different style preferences. It closely resembles wood, providing a similar aesthetic appeal. However, it is important to note that MDF can swell when exposed to water, which may make it less suitable for moisture-prone areas.

Ultimately, the choice of casing material depends on your specific requirements and preferences. Consider factors such as style, durability, and budget to make an informed decision. Choosing the right door casing material will not only enhance the overall aesthetic of your space but also ensure longevity and functionality.

paint-grade wood casing

Installing Door Casing Made Easy

Installing door casing can be a rewarding DIY project that allows homeowners to save money on labor costs and showcase their carpentry skills. With a few basic tools and some simple instructions, you can achieve a professional-looking door casing installation.

The tools you’ll need for door casing installation are:

  • A power miter saw: This tool will ensure accurate and precise cuts on the casing pieces.
  • An 18-gauge finish nailer: A finish nailer will make attaching the casing to the door frame quick and easy.
  • Finish nails of different sizes: You’ll need a variety of finish nails to secure the casing pieces in place.
  • Carpenter’s wood glue: Wood glue will provide additional strength and stability to the casing installation.

Once you have gathered your tools, the installation process begins with measuring and marking the reveal line around the door frame. This ensures the casing pieces are positioned correctly.

Next, use the power miter saw to cut the casing pieces to the appropriate lengths. Make sure to double-check your measurements before cutting.

After cutting the casing pieces, it’s time to install them. Apply a thin layer of carpenter’s wood glue to the back of each piece and position them according to the marked reveal line. Secure the casing to the door frame using the 18-gauge finish nailer and the appropriate size of finish nails.

Pay attention to the corners and make sure they are joined securely. If necessary, use a coping saw or a miter saw to achieve clean and tight corner joints.

Once all the pieces are installed and secure, wipe away any excess glue and allow it to dry completely.

Following these simple steps will result in a precise and secure installation of your door casing. And remember, if you plan on doing more trim work in the future, purchasing your own tools can be a wise investment.

What Is Interior Door Casing?

Interior door casing plays a dual role in enhancing the look of a door and concealing the transition between the wall and the door frame. It serves as a decorative and utilitarian trim that adds style and elegance to any room. Typically, interior door casing consists of three separate pieces, including two long trim pieces for the sides of the door and a shorter piece, known as the head casing, for the top of the door.

The History of Door Casings

The history of door casings can be traced back to the Victorian era, where intricate designs featuring fluted boards and decorative corner blocks called rosettes were popular. These ornate details added a touch of grandeur to homes of that era. Over time, door casings have evolved and can now be found in a wide range of styles, from simple and minimalist designs to more elaborate and ornate options.

One of the key advantages of interior door casings is their ability to complement various architectural styles and interior decor choices. Whether you prefer a traditional, contemporary, or eclectic look, there are door casings available to suit every preference.

interior door casing

Interior door casing serves as both a functional and aesthetically pleasing element in home design. It adds a finishing touch to the overall look of a door and provides a seamless transition between the door frame and the surrounding wall. From classic to modern, the options for interior door casing are extensive, allowing homeowners to customize their space according to their unique style and preferences.

Mitered vs. Butted Door Casings: Which Is Right for You?

The choice between mitered and butted door casings depends on the desired style and overall aesthetic of the room. Mitered casings use angled joints to connect the trim pieces, creating a clean and seamless look. They can be plain or elaborate, with intricate details. Butted door casings, on the other hand, combine two side casing boards with a wider head casing that rests directly on top. This style is often chosen for rooms with high ceilings, as the wide head casing draws the eye upward. Rosettes can be added to door casings for a decorative touch, enhancing the overall design.

mitered door casings

Door Casing Ideas for Every Style

When it comes to selecting a door casing for your home, it’s important to consider the style and architectural design. Different homes call for different trim options to achieve a cohesive and visually appealing look. In this section, we will explore a few door casing ideas that can elevate the style of any home.

Colonial Style Casing

The colonial style casing is a classic choice that adds simple elegance to any home. It features raised edges and mitered corners, providing a refined and timeless look. This style of casing is versatile and complements a variety of architectural styles. Whether your home is traditional or modern, the colonial style casing can enhance its overall aesthetic.

colonial style casing

Ripple Effect Casing

If you’re looking for a more intricate and eye-catching design, the ripple effect casing is an excellent choice. This style combines several layers of varying sizes, creating a sense of depth and texture. It is particularly well-suited for Victorian-era homes or Colonial Revival styles. The ripple effect casing adds a touch of elegance and sophistication to any space.

Simple Elegance Casing

For those who prefer a clean and minimalist look, the simple elegance casing is the perfect option. This style combines flat side casings with a well-defined header casing and crown molding. The result is a sleek and sophisticated design that exudes simplicity and class. The simple elegance casing is a popular choice for modern and contemporary homes.

When choosing a door casing, consider the style and character of your home. Whether you prefer a classic colonial style, an intricate ripple effect, or a minimalist and sophisticated design, there are countless door casing ideas available to suit your preferences and enhance the overall style of your home.

Tips for Choosing the Right Door Casings

Selecting the right door casings involves several considerations. To create a cohesive look, it’s important to match the door casings to the existing trim in the room. This helps ensure that the overall design flows seamlessly. When choosing door casings, it’s also crucial to consider the style of your home. Whether your home has a formal or casual style will guide your choice of door casings. For homes with a more formal style, intricate trim options may be suitable. On the other hand, simpler trim lines may work well for casual Ranch-style homes.

However, don’t be afraid to add your own personal style to the mix. You can choose unique molding profiles, different materials, or even add a pop of color to your door casings. This will give your space a touch of personality and make it stand out. If you need help or inspiration, consider visiting a molding specialist showroom. Experts there can offer valuable guidance and provide access to a wide range of options.

When it comes to selecting door casings, matching existing trim, considering home style, and adding personal style are key factors to keep in mind. By carefully choosing the right door casings, you can enhance the overall aesthetic and elevate the beauty of your home.

Sizing Guidelines for Trim in a Room

While there are guidelines for sizing trim in a room, personal preference and design choices should ultimately prevail. As a starting point, a ratio of 7 percent is often used for baseboard sizing in traditional-style homes. For example, if the ceiling height is 8 feet, a 7-inch-tall baseboard would be suitable. Casings are generally kept at about 50 percent of the height of the baseboard, but casings that match the dimensions of the baseboards can also work well.

Crown molding sizing is subjective and depends on factors such as ceiling height and desired style. Mock-ups of different sizes and profiles can help determine the right crown molding for a particular room. Chair rail placement, typically one-third of the way up from the floor, can create the illusion of a taller room.

When it comes to choosing the right trim sizes, it is important to consider the overall proportions, style, and aesthetic of the room. Mock-ups and samples can be helpful tools in visualizing different trim options and finding the perfect fit for your space.

Achieving a Cohesive Trim Design

A well-trimmed room is one where the baseboard, casings, and crown molding relate to each other in terms of style, proportions, sizing, and finish. Achieving a cohesive trim design involves selecting trim elements that complement each other and match the desired design. Matching the baseboard with the casings and crown molding can create a unified look and feel in the room. Mock-ups and samples can help in visualizing how different trim elements come together and how they interact with the overall design.

When considering a cohesive trim design, it is important to choose trim elements that share similar characteristics. This includes selecting baseboards, casings, and crown moldings that have matching profiles, finishes, and overall styles. By ensuring consistency in these elements, you can create a harmonious and visually appealing space.

Matching Baseboard, Casings, and Crown Molding

To achieve a cohesive trim design, it is essential to match the baseboard, casings, and crown molding. This means selecting trim pieces that have consistent widths, depths, and styles. When all three elements are matched, they create a seamless transition between the floor, wall, and ceiling, resulting in a polished and cohesive look.

Start by choosing a baseboard that complements the overall style of the room. Consider the height and width of the baseboard to ensure it is proportionate to the size of the space. Next, select casings that have a similar profile and width as the baseboard. This will create a sense of continuity and unity between the two elements.

Finally, choose crown molding that complements the baseboard and casings. Crown molding adds an elegant touch to the room and can tie the overall design together. It should have a similar style and proportion to the other trim elements while also considering the ceiling height and architectural details of the space.

Visualize with Mock-ups and Samples

Mock-ups and samples can be helpful tools when visualizing how different trim elements come together. Consider creating a physical mock-up or using a digital design program to simulate the placement of baseboard, casings, and crown molding in the room. This will allow you to see how they interact with other architectural features and color schemes.

Additionally, it is advisable to request samples of the baseboard, casings, and crown molding from suppliers or visit a local showroom. By physically seeing and touching the trim elements, you can better assess their quality, style, and how they will look in your space. Comparing different samples side by side can help you make an informed decision when choosing the right trim elements for your cohesive design.

By achieving a cohesive trim design with matching baseboard, casings, and crown molding, you can enhance the overall aesthetic appeal of your space. Careful selection and visualization of trim elements will ensure a harmonious and visually pleasing result.


Selecting the right door casing sizes and trim elements is crucial in creating a well-designed interior space. The materials, joint style, and sizing of the trim can have a significant impact on the overall aesthetic of a room. While guidelines for trim sizing can provide a starting point, personal preference and the architectural style of your home should also be considered.

When choosing door casing sizes and trim, it’s important to take into account existing trim in the room to ensure a cohesive look. Mock-ups and samples can be valuable tools in visualizing different trim options and making informed decisions. By following these tips, you can achieve a visually appealing trim design that enhances the architectural beauty of your home.

Remember, the goal is to create a cohesive and harmonious look throughout your space. Whether you prefer simple and understated or elaborate and ornate trim, there are numerous options available to suit your personal style and design preferences. With careful consideration and attention to detail, you can elevate the overall aesthetic of your home with the right door casing sizes and trim selections.


What is door casing?

Door casing, also known as trim, is a decorative and functional element that enhances the architectural beauty of a home. It consists of three separate pieces: two long pieces for the sides of the door and one shorter piece (head casing) for the top of the door.

What materials are used for door casing?

Door casing can be made from various materials, including paint-grade wood, hardwood, and multi-density fiberboard (MDF). The choice of material depends on factors such as budget, desired finish, and exposure to moisture.

Can I install door casing myself?

Yes, door casing installation is a DIY project that can be done with basic carpentry skills. It requires tools such as a power miter saw, finish nailer, nails, and wood glue.

What is the purpose of interior door casing?

Interior door casing serves both a decorative and utilitarian purpose by enhancing the look of the door and concealing the transition between the wall and the door frame.

What are the different types of door casing designs?

There are two main types: mitered door casings, which use angled joints for a clean look, and butted door casings, which combine two side casing boards with a wider head casing.

How do I choose the right door casing for my home?

When selecting door casing, consider factors such as the style of your home, existing trim, and personal preference. Mock-ups and samples can help visualize different options.

What are the guidelines for sizing trim in a room?

While there are guidelines, personal preference and design choices prevail. Baseboard sizing is often based on a ratio, crown molding depends on ceiling height and style, and chair rail placement is typically one-third of the way up from the floor.

How do I achieve a cohesive trim design?

A cohesive trim design is achieved by selecting trim elements that complement each other and match the desired design. A unified look can be created by matching the baseboard with the casings and crown molding.

What are some door casing ideas for different styles?

Door casing ideas range from classic options like colonial style casing to more intricate designs like ripple effect casing. There are numerous options available to suit various preferences and design styles.

What should I consider when choosing door casings?

When choosing door casings, consider factors such as matching existing trim, the style of your home, and adding your own personal style. Getting help from molding specialists can provide valuable guidance and access to a wide range of options.

How do I select the right door casing sizes?

While guidelines for sizing trim can provide a starting point, personal preference and design choices should prevail. Mock-ups and samples can help determine the right sizes for a particular room.

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