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Quick Answer
Adding trim around interior windows is an aesthetic choice that can provide some practical benefits as well. Trim can help cover any imperfections where the wall meets the window frame, providing a cleaner finished look. It can also complement the style of the windows and moldings in the rest of the room. Some common reasons to add interior window trim include:
- To create a decorative frame effect around the windows
- To conceal gaps or flaws between the walls and window frames
- To coordinate with other trimwork and moldings in the room
- To add visual interest and architectural detail
If your windows look a bit unfinished or you want to enhance the architectural details, adding trim can be a relatively easy upgrade. The project can typically be completed in a weekend by a homeowner with basic DIY skills. Just be sure to choose the right materials and trim profiles to match your home’s style.
Should You Add Interior Window Trim?
Here are some factors to consider when deciding whether to add trim around interior windows:
The Style of Your Home
Some interior design styles rely heavily on architectural accents like trimwork, while others take a simpler approach. For example, Victorian, Craftsman, and Colonial style homes tend to feature ample trim for decorative effect. On the other hand, contemporary, modern, and minimalist rooms aim for clean lines and less ornamentation. If trim matches your home’s style, it can be an excellent addition around the windows.
Complementing Existing Trimwork
Look at other architectural details in the room you want to install window trim in. Is there already crown molding, baseboards, door casings, or chair rail moldings? If so, adding trim around the windows can help tie the room together. The goal is to make sure all trimwork is cohesive. Match styles, proportions, and finish colors.
The Condition of the Existing Window Frames
Many windows are simply nailed into wall openings without a proper rough opening being framed out. This can leave gaps, cracks, uneven drywall, or other flaws around the edges. Adding trim is an easy way to conceal any imperfections for a neat appearance. If the existing window frames have a clean installation, trim is optional.
Your Decor Goals
Trim can be simple and understated or ornate and decorative. Think about the look you want to achieve. For a light and airy feel, narrow trim in painted white or off-white is ideal. For a bold or elegant look, wider trim profiles with detailed edges and richer stain colors make more of an impact. Let your overall decor goals guide your trim choices.
Choosing Interior Window Trim
Picking out the right window trim involves decisions on material, shape and size, and finish. Here are some tips for choosing trim that fits your home’s style:
Common Trim Materials
- Wood: Versatile and easy to work with, wood trim can be carved, routed, or molded into endless profiles. Oak, poplar, pine, and maple are commonly used. Can be painted or stained.
- PVC/Vinyl: Budget-friendly and low maintenance option. PVC trim resists moisture, rotting, and warping. Works well in bathrooms, laundry rooms, and kitchens.
- Polystyrene: This plastic-based trim can be shaped into detailed designs but is light and won’t last as long as wood.
- Plaster: Gives an ornate, old-world effect with detailed shapes and designs. Requires a skilled installer.
Wood is the most popular choice since it’s readily available, easy to work with, and can suit any decor.
Trim Shapes and Sizes
Common interior window trim profiles include:
- Flat trim boards: Simple and versatile rectangular pieces.
- Brickmould: Beveled edges create a layered border effect.
- Stool and apron: Lower stool trim frames the bottom, while apron trim borders the sides.
- Picture frame style: Multiple trim pieces frame the window like a picture.
Aim for widths between 2 to 6 inches. Measure existing moldings in the room for a proportional look. Hardwood boards around 3/4 inch thick have a substantial appearance.
Trim Finishes
- Painted: Any color paint complements your decor. White is a popular choice.
- Stained: Bring out wood grain patterns with stains in light, medium, or dark shades.
- Faux wood grain: Use paint techniques to create wood look on vinyl or polystyrene trim.
- Distressed: Intentionally create a worn, aged effect with worn edges and dings.
Match existing trim finishes in the room or make windows a contrasting accent.
How to Install Interior Window Trim
Installing interior window trim takes some DIY carpentry skills, but the process is relatively straightforward. Follow these basic steps:
Step 1: Measure the Window Openings
Measure width and height to determine how much trim you need. Include the window sill if trimming it out as well. Calculate linear footage by adding up all side measurements.
Step 2: Cut the Trim Pieces
Cut trim boards to the needed lengths with a miter saw or hand saw. Miter the ends at 45 degree angles so trim will fit tightly at the corners.
Step 3: Install Corner Pieces
Nail the mitered end pieces into place first. Use a nail gun or small finish nails and wood glue. Set nails and fill holes.
Step 4: Install the Frame Pieces
Measure and cut trim to fit between the corner pieces. Nail into place and set nails. Use scarf joints to join trim if needed.
Step 5: Caulk Seams
Caulk along the seams and nail holes for a seamless look. Let dry completely.
Step 6: Prime and Paint or Stain
Apply primer if painting. Then paint trim boards in your chosen colors. For stain, apply prep conditioner first for even absorption. Let trim fully dry before reinstalling any window sashes.
Interior Window Trim Ideas
To personalize your window trim, get creative with these design ideas:
Arched Trim
Frame rectangular windows with arched pieces across the top. Cut mitered edges to extend trim boards vertically too.
Crown Molding Accents
Use crown molding trim, turned upside down, above the window for a built-in architectural look.
Contrasting Colors
Paint window trim in a different accent color than walls or other trim for a bold pop of color.
Integrate Shelving
Flank windows with built-in shelving trimmed out to match. Great for displaying plants or decor.
Shiplap Design
Attach shiplap-style boards horizontally for a farmhouse vibe. Looks great in bathrooms.
Sill and Apron
Use separate trim pieces for a framed effect – sill on bottom and apron on sides.
Fancy Pediment
Construct a triangular pediment trim piece over the window for a grand, elegant look.
Trim Examples by Window Style
Matching trimwork to your existing window design is key for the best results. Here are some window-specific trim ideas:
Double Hung Windows
Use a simple frame of flat boards or brickmould trim. Add stacked boards on the sill.
Casement Windows
Picture frame the casement with flat boards. Add an angled pediment top piece for drama.
Bay Windows
Flat boards on the sides and sill balance the angles. Add corner blocks for depth.
Oriel Windows
Play up the shape with angled bottom stool trim flowing into the apron molding.
Round or Oval Windows
Layer shaped trim pieces toward the center to accentuate the curve.
Corner Windows
Let the angle dictate the direction of vertical trim boards for tailored framing.
Jalousie Windows
Keep trim simple with flat pieces on the stiles and rails. Emphasize horizontal lines.
Skylights or Roof Windows
Frame out a “ceiling medallion” with crown molding. Paint it in a sky blue accent color.
Budget for Interior Window Trim
If you’re adding trim to multiple windows, costs can add up. Here are some average price estimates:
Trim Material Costs
| Wood trim board (per linear foot) | $1 – $5 |
| PVC/vinyl trim board (per linear foot) | $1 – $3 |
| Polystyrene trim board (per linear foot) | $0.50 – $2 |
| Plaster trim molding (per linear foot) | $5 – $10 |
Installation Costs
Professional installation typically ranges from $5 to $15 per linear foot, including labor and materials.
For DIY installation on 5 standard windows, expect costs around:
- Materials: $100 – $300
- Tools: $50 – $150 (if purchasing new tools)
- Total: $150 – $450
Costs vary based on window sizes, trim choices, and any custom fabrication needed. Get professional estimates for your specific project.
Tips for Trimming Windows Like a Pro
Follow these professional window trimmer tips for flawless results:
- Always nail into window frames, not just drywall, for sturdy support.
- Pre-drill holes in trim to prevent splitting wood when nailing.
- Use scarf joints to seamlessly join trim pieces that are too long.
- Fill all nail holes and gaps with putty before painting or staining.
- Apply caulk after paint/stain for invisible seam lines.
- Make subtle mitered returns at corners for polished finish.
- Prime all sides of trim, especially cut ends, before installing.
Take your time measuring precisely and work slowly for tight fitting joints. Neat window trim takes patience but creates a flawless finished look.
Hiring a Professional
For complex trimwork or large window installations, consider hiring a professional window trim carpenter. Benefits include:
- Perfect joints, seams, and alignments.
- Efficiency from years of experience.
- Right tools for the job.
- Knowledge of building codes.
- Smoother overall workflow.
To find a qualified pro in your area, look for referrals from trusted sources. Search for companies that specialize in trim carpentry specifically. Be sure to verify licenses, insurance, examples of past work, and reviews. Get a detailed written quote for the project timeline, materials, and cost.
Expect to pay $200-$500 per window for installation, including custom-milled trim. Larger or more intricate trim details will increase costs.
Conclusion
The decision about whether to add trim around interior windows is mainly an aesthetic one. If your windows look bland or unfinished, coordinating trim can add decorative appeal and tie the room together. Match styles and finishes to your home’s existing details. For DIYers, trim carpentry does require some skill but can be manageable with patience and the right techniques. There are also pros available for flawless results. Just remember to budget accordingly for materials and labor. Surrounding your windows with proper trimwork ultimately enhances the architectural style and provides a clean, polished look.