Understanding Interior Door Trim and Moulding
Choosing the best door casing for your room comes down to the look and feel you want, along with how much creativity you want to add to your home.
Because there are different kinds of moulding and millwork for use around the house,
you’ll sometimes hear terms like casing, trim and moulding used interchangeably. It’s helpful to understand which is which.
Interior Trim Materials
Interior door trim is available in a variety of materials to suit various needs. Here are some of the most popular types.
- Wood trim is a timeless material choice that remains popular today due to its natural beauty and durability. Wood trim can be painted or stained, or even clear coated to allow the natural grain to show through.
- Polystyrene is a very economical choice for door trim. Most polystyrene comes in the pre-finished form, but some kinds can be painted. Polystyrene is also lighter and much easier to cut than wood, but it’s a softer material, which means it can dent more easily.
- MDF is another lower-cost option for trim. Like polystyrene, it isn’t as sturdy as wood, but it’s easier to cut. It’s also a bit more resistant to splitting than some polystyrene products when installing with nails.
- Composite trim, which is crafted using a mixture of natural wood and man-made materials, offers the heartiness and beauty of wood with a few additional advantages. One of the main ones is that, unlike wood, composite does not swell with the changing humidity, which can cause wood to warp or crack over time.
Casing
Casing refers to the entire frame around the door. This frame is functional, as it covers any gaps between the wall and the door. It’s also decorative, as it often complements the door’s design.
Trim
Trim refers to the individual pieces that make the casing. This includes the two long side pieces and the shorter piece, also called a head casing, which covers the top of the frame. You’ll often hear trim used to refer to the moulding around the floor or windows, and that’s because it’s usually the same product and style.
Moulding
We use the word moulding to refer to the trim that surrounds a room. You might be familiar with the phrases base moulding, case moulding or crown moulding. They all refer to trim, but base moulding refers to floor trim or baseboards, case moulding to door and window trim, and crown moulding to decorative trim between a wall and ceiling.
What Are Miter Joints and Butted Ends?
Because door casing is made of three parts — the two sides and the top — there needs to be a joint of some sort. On mitered joints, the corners are cut diagonally so they fit together. Butted ends aren’t angled, and the top piece of trim rests on top of the side pieces.
When deciding on mitered or butted ends, look at the styles in your other rooms and think about your design. Mitered ends pair well with a modern or minimalist look, while butted ends are more traditional or rustic.
Popular Modern Door Trim
Narrow down your trim options by considering your style and design preferences. If you want a clean design, a minimalist or straight-edge casing will work well. Or if you want some extra character in your design, consider the textures of European or colonial casings.
Use these styles as a starting point since this guide offers more trim ideas.
Craftsman
Interior craftsman-style door casings have a thick border. This gives them a lot of potential and makes it easy to turn them into a statement piece in the characteristic open plan of a craftsman-style home.
Rustic
Rustic style incorporates simple, no-nonsense designs. Think of plain and practical straight lines you can use to enhance any design.
Colonial
The colonial style embraces texture in its casings. With colonial-style doors, you’ll find bead and cove profiles in the trim that convey a sense of elegance and old-world style.
Arched
An arched doorway adds extra flair to any design, but pairing it with the right trim will turn it into a statement piece. Because the door’s shape is out of the ordinary, consider a plain trim so as not to overwhelm the doorway.
Square Edged
Think straight, classic lines, and you’ll think of the square-edged casing. With square corners and thin trim, it pairs well with simple or minimalist designs.
Minimalist
Minimalist door casings are thin, plain and discreet. There are none of the frills of European styles or the heft of craftsman designs — just pure functionality.
European
European designs encompass pure elegance. With their substantial design and construction, they look and feel sturdier than other options. From raised renaissance leaf patterns to textured Greek designs, these door casings become a feature piece of any room.
Nontraditional Trim Ideas
If you’re looking to step away from standard white or wood trim, here are some ways to make your door stand out and enhance your overall design.
Use a Thicker Moulding
You don’t need to stick with the standard-size trim for your doors. You can use a different width to make it thinner or thicker. Thinner casings give a subtle, softer feel, whereas thicker trim makes more of a statement.
Mix and Match Colors
There are nearly endless possibilities for door and trim paint colors and finishes. You can be daring, bold, loud, soft, staid or anything in between when it comes to the colors in a room. Painting your door trim opens a wide range of possibilities for your room design.
Play With Tile
Using a strip of tile is a unique way to replace trim around your doors and windows.
You can use subway tile or smaller mosaic tile. This is a great way to play with color and add texture to a room.
Explore Wallpaper
As with tile, take advantage of the vibrance and versatility of wallpaper to add extra style to modern door trim.
Go With No Trim
Doors don’t necessarily need trim. Having a well-made, trimless door helps it blend into a wall, giving it the feel of a secret door.
What Color Should Trim Be?
Traditionally, trim is either stained wood or wood that’s been painted white, depending on the type of home and the style of the time. But door trim doesn’t need to stick with tradition. Door trim can complement a room or even be the center of a design. Simply choose the trim color that you feel best fits your room design, whether it’s a traditional white or a brave cherry red. Here are some more ideas to consider when planning your trim colors:
Try White Walls With Colored Trim
There are several ways you can combine white walls with colored trim. For example, dark blue trim can give a dignified or elegant feel to a white room. A muted blue stands out but feels more relaxed. Gray or beige trim contrasts with white walls just enough to maximize the dimensional appeal of the trim. Depending on the shade, green trim can work with white walls to either suggest a touch of nature or create a coastal vibe.
Paint the Trim Darker Than the Walls
When you paint door trim darker than walls, you direct attention from the walls to the door frames and the doors. You might want to consider darker trim colors if you have ornate trim or if you have richly paneled doors that you want to highlight. In addition, painting your door frames a dark color can be a quick way to give a room a more modern feel. For a different spin on this color scheme, paint your trim a darker shade of your wall color and create a monochromatic look.
Paint Walls and Trim the Same Color
Painting walls and trim the same color achieves different looks depending on the colors and paint sheen you choose. For example, if you paint the walls and trim a light color, you’ll give a room an open and relaxed feel and make the most of natural light from the windows. Dark walls and dark trim colors work together for a stately look. As long as the color isn’t too dramatic, painting trim the same color as walls can also be a way to let the trim and walls fade into the background, allowing your décor, furniture and accessories to make a bigger impact. If you want more impact, choose a gloss or semi-gloss finish for trim and a flat or eggshell finish for walls to create a monochromatic scheme with a subtle visual distinction.
Should Your Door Match Your Trim?
There are no fixed rules in interior design. There’s only what works best for a specific design. There are three basic options you can choose from, though:
- Match the door and trim.
- Use complementary colors.
- Use contrasting colors.
Each option has its benefits. Matching the color of the trim to the door is a traditional approach, but that doesn’t mean it’s boring. Traditional design styles can bring simplicity or elegance into any room. On the other hand, contrasting colors make a bold statement. Complementary colors give you more room to play as you pair different colors, shades or tones.
Choosing Your Door Trim
When choosing your door trim, it’s useful to think about the overall style of your house. It doesn’t matter if you’re in a colonial, ranch or craftsman home. If style is important to you, then you’ll want to keep it consistent throughout the house.
If you’re more focused on the design of a specific room, then go with your instincts and pick the style, size and color that you feel work best with your design.