Installing crown molding on a window can seem intimidating, but with the right tools and techniques, it can be an easy DIY project. Crown molding frames a window beautifully and adds an elegant finished touch to any room. Here is a step-by-step guide to teach you how to crown molding on a window.
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What You Need
Before starting any project, it’s important to ensure you have all the necessary supplies. Here is what you’ll need to crown molding a window:
- Crown molding – Preprimed or unfinished, the width is up to you.
- Miter saw – To make clean angled cuts.
- Miter box – A manual option if you don’t have a miter saw.
- Tape measure
- Stud finder
- Level
- Nail gun or hammer
- Wood filler
- Caulk
- Paintable latex caulk
- Primer – If using unfinished crown molding.
- Paint – To match your trim.
- Sandpaper
- Wood glue
- Eye and ear protection
For materials, measure the width of the window first to determine how much crown molding you will need. It’s better to get extra than to run short. The other supplies are used for cutting, installing, and finishing the molding.
Preparing the Window
Before installing crown molding, prep the window so that the molding will fit neatly:
- Clean the window frame well with a degreaser to remove dirt and oils.
- Caulk the gap between the wall and window frame for a smooth surface.
- Fill any holes or imperfections with wood filler; let dry completely.
- Sand any rough areas on the window frame to smooth.
- Prime and paint the window frame and surrounding wall area.
Prepping provides an even base so the molding can lie flush to the surface. Ensure the caulk and paint is dry before moving onto the next step.
Measuring and Cutting Crown Molding
Once your materials are purchased and the window is prepped, it’s time to measure and cut the molding:
- Measure the width of the window frame.
- For the side pieces, cut the crown molding to this length plus an extra inch on each side.
- For the top piece, measure the width from one bottom inside edge to the other bottom inside edge. Add extra on the ends.
Cutting the pieces slightly longer gives you wiggle room to adjust. It’s much easier to trim molding than to try to extend it.
Use a miter saw set to the desired crown molding angle to cut the pieces. Cut the top angle on one end of each piece and the bottom angle on the other end. This allows the molding to fit together properly.
Installing the Crown Molding
Once cut, it’s time to install the crown molding on the window. Have a helper for easier installation:
- Hold one side piece in place with the top angle facing the ceiling and bottom on the frame. Make sure it’s square.
- Drill pilot holes through the molding into the window frame to prevent splitting.
- Nail the molding into place with 4d finish nails, countersunk into the wood.
- Repeat on the other side, aligning the ends with care.
- For extra strength, run a small bead of wood glue before nailing.
- Repeat the process for the top piece. Use scrap wood underneath for support as you nail.
- Examine the joints and use wood filler in any gaps; let dry completely.
Go slowly here, and double check each piece is level and joined correctly. Using scrap lumber helps support the molding while nailing to prevent sagging.
Finishing the Crown Molding
The final step is finishing the installed crown molding with caulk and paint:
- Sand any rough areas on the molding with fine grit sandpaper.
- Caulk along the top edges and joints with latex painters caulk.
- Apply two coats of paint in your trim color, letting the first coat fully dry.
- Remove any painter’s tape and enjoy your beautiful finished window!
Be sure to use high quality paintbrushes to avoid brush marks. Take your time with the finish work, and don’t rush the coats. The end results will be worth it!
Tips and Considerations
Follow these tips for a foolproof install:
- Check for level and plumb often as you work – adjust as needed.
- Make sure framing is secure before installing crown molding.
- Test angles on scrap pieces first if you’re unsure of cuts.
- Use wood glue for very smooth window frames.
- Fill nail holes with putty after painting.
- Consider hiring a professional if you’re unsure about miter cuts.
Take your time, and don’t be afraid to adjust pieces that aren’t fitting correctly. Custom fitting each piece results in tight seams and prevents gaps or sagging after painting.
Cost to Install Crown Molding on a Window
If hiring a professional, you can expect to pay:
| Crown Molding on One Window | $200 – $500 |
| Crown Molding on 10 Windows | $2,000 – $4,000 |
| Crown Molding on Whole House | $3,000 – $8,000 |
Costs vary based on the size of the job, labor rates in your area, and the type of molding used. Simple pine molding is the most affordable while detailed, ornamental molding costs more to install. Get free estimates from local professionals before starting any project.
Frequently Asked Questions
What tools do I need to install crown molding?
The basic tools you need are a miter saw, miter box, tape measure, stud finder, level, nail gun or hammer, wood filler, caulk and paint supplies like primer, brushes and sandpaper.
What type of nails work best?
4d finish nails are best for most crown molding installations. Pre-drill holes to avoid splitting the wood.
Should crown molding line up with baseboards?
It looks best if crown molding aligns with the top edge of baseboards around a room. This gives a neat, coordinated finished look.
Can I use caulk instead of coping inside corners?
Caulking inside corners is much easier but results in visible seams. Coping creates a seamless professional look inside corners.
Should I paint or prime molding first?
Always prime unfinished crown molding before installation for the best paint adhesion. Then caulk and paint after installing for an flawless look.
Conclusion
Installing crown molding on windows is an easy process with the right preparation and tools. By accurately measuring and cutting the molding, taking care during installation, and applying a smooth professional finish, you can enjoy beautifully framed windows. Follow these tips for stunning results. Don’t be intimidated by the process – with a little time your windows can look like they were professionally designed.