Feeling too nervous to install crown molding yourself? We felt the same way, but we just finished installing crown molding in our daughter’s bedroom and it turned out to be both affordable (under $100) and manageable. With the right tools, a little patience, and attention to detail, this project is well within reach for most DIYers.
Below I’ll walk through how we did it, the tools and materials we used, and the tips that made the job much easier than expected. After this project I actually look forward to adding crown molding to more rooms.
Steps To Install Crown Molding
Here are the basic steps you’ll follow to install crown molding in any room. I’ll expand on each step below so you can see how it all comes together:
- Select your crown molding
- Determine the cutting angles
- Set up a cutting guide or platform
- Measure, cut, and fit pieces
- Nail in place, then caulk and paint
Video Tutorial
We documented the entire process with photos and a video so you can watch the steps in action. The video shows how we set up the cutting guide, determine angles, cut pieces with a miter saw, and install each section of molding. Watching the process can make those first intimidating cuts feel much more approachable.
If you prefer to learn by watching before doing, review the video first and then follow the step-by-step instructions below.
Selecting Your Crown Molding
We used standard 3 5/8″ pre-primed crown molding because it matched what was already in the rest of the house and it’s one of the more budget-friendly profiles. You can choose different profiles or layer trim to make a thicker, more decorative look, but for a clean, classic finish this size works well and is easy to handle.
Each 8-foot piece cost about $9.50, and with a few extras to account for mistakes and waste, our total material cost for the room was $67.
Tools & Materials Needed
You can cut and install crown molding by hand, but a few simple power tools will make the project much faster and more accurate. We used a miter saw and a brad nailer, and also added a crown cutting guide that proved to be extremely helpful.
- Miter saw
- Nail gun (brad nailer)
- Crown cutting guide (adjustable platform)
- Measuring tape
- Stud finder
- Pencil
- Caulk and caulk gun
- Paint and small angled brush
- Ladder or step stool
The crown cutting guide was the real hero of this project—once it’s set up it replicates the exact angle the molding will sit at, making cuts consistent and predictable.
How To Use a Crown Cutting Guide
A crown cutting guide creates an angled platform that matches the spring angle of your molding—the angle at which the molding leans away from the wall. Most crown molding spring angles are 38°, 45°, or 52°. Use an angle finder to determine your molding’s spring angle, then set the guide accordingly.
With the guide set, you’ll place the molding on the platform in the correct orientation and cut using your miter saw. The guide simplifies the geometry so you don’t have to translate awkward angles on the saw itself.
Determine Your Wall Angles
Before cutting any pieces, measure and record the angles at each corner of the room. Walls are rarely perfect, and assuming every corner is 90° can lead to ill-fitting joints. Use an angle finder on each corner and note the reading. Most corners will be very close to 90°, but a few may be slightly off, and those differences matter when you’re fitting trim.
After measuring, convert each corner angle to the corresponding saw setting. For a true 90° corner you’ll typically use a 45° cut on the saw for both mating pieces. For out-of-square corners, follow the guide provided with your crown tool or saw manual to determine the correct miter settings.
Measure Your Wall Lengths
Measure corner-to-corner for each wall and record the dimensions on a simple sketch of the room. An extra set of hands or a laser tape measure makes this step faster and more accurate. Keep your measurements organized so you can cut pieces in sequence and avoid wasting material.
Label each piece on your sketch so you know where it belongs during installation.
Set The Angle of Your Miter Saw
Adjust the miter saw blade to the required angle for each cut. Which direction you angle the blade depends on whether you’re cutting for an inside or outside corner and whether the piece will be installed on the left or right side of the corner. Refer to the cutting guide or the instructions that came with your crown jig to match the correct blade orientation and placement of the molding on the saw.
When you’re learning, double-check your settings before each cut. It’s easy to reset a saw incorrectly if you’re switching between several angles.
Cutting Your Crown Molding
Place each molding piece upside down on the cutting guide so the ceiling-facing edge is on the bottom. This orientation mimics how the molding sits when installed and ensures the profile lines up after cutting. Take your time and remember the rule: measure twice, cut once. It helps to leave a little extra length on your first cut; you can always trim more away but you can’t add wood back.
With careful measuring and the cutting guide in place, cutting becomes a repetitive, confidence-building process.
Nail Your Crown Molding In Place
Attach each piece by nailing through the top and bottom edges of the crown into studs or framing. We used 2″ 18-gauge brad nails and placed a nail every 12–16 inches. A brad nailer makes this quick and keeps the molding snug to both wall and ceiling. If you don’t have a nail gun, finish nails driven with a hammer and nail set will work, but the process will take longer.
Installing the molding around the room took us about two hours from first cut to last nail for this bedroom.
How To Make a Scarf Joint
When a wall is longer than your molding, join two pieces with a scarf joint rather than butting the ends together. Overlap the two pieces so the joint is more seamless. To do this, cut one piece like an inside left corner and the mating piece like an outside right corner (or vice versa) so the profiles interlock cleanly and lay flat against the wall.
A well-cut scarf joint reduces visible gaps and gives a more professional result than a simple butt joint.
Finish With Caulk & Paint
After everything is nailed in, caulk all the seams, gaps, and nail holes before painting. We used white paintable caulk and applied it where the crown meets the ceiling, where it meets the wall, and where two pieces join. Fill nail holes with caulk, wood putty, or spackle. Once the caulk has dried, paint the trim to match the rest of the room. A small angled brush helps you get a crisp, clean finish.
Caulking and painting smooth out small imperfections and make the trim look built-in and polished.
Total Crown Molding Project Cost
Our material cost for the room was about $67. We added a crown cutting guide that cost around $30, so the total project cost was roughly $97. For the improvement in appearance and the resale appeal crown molding adds, that’s a small investment for a big visual payoff.
More Crown Molding Projects & How-Tos
Since completing this project, we’ve tried a few other crown installations, including building up thicker, more ornate profiles and adding molding to cabinets and built-ins. Different approaches let you tailor the look to the style of your home—from simple and modern to layered and ornate.
- How to build up crown for a chunkier look
- Adding crown to kitchen cabinets
- Installing crown around built-ins
If you’ve tackled crown molding before, what tips or tricks worked for you? If you were intimidated at first, did any particular tool or technique help you gain confidence?