DIY Arch Wall: How I Built a Custom Statement Wall That Looks Built-In

When we bought this home two years ago, the dining room was one of those spaces I knew I’d eventually want to tackle. It was dated, open to the downstairs with a half wall, and just didn’t match the character I envisioned for our home. We closed off that wall right away, and after a full kitchen remodel last summer, this poor dining room wall sat there — blank and boring — waiting for its moment.

I’ve always loved incorporating arches into our spaces (remember the arch box moulding in my girls’ rooms?). This time, I wanted to bring that same charm into our main living area, but in a fresh, architectural way that looked built in. I wanted this wall to complement the stone we added in the kitchen and tie both spaces together seamlessly.

And friends… it turned out even better than I imagined. This entire project took only a few days and a couple of hundred dollars — but it completely transformed the space.

You can shop all of my project supplies on my Lowe’s storefront right here!

Before We Started

Here’s a little backstory: the dining room connects directly to the kitchen, and I really wanted continuity between the two spaces. The adjacent kitchen wall features stonework, so I wanted the new arch wall to feel like it belonged — cohesive, soft, and a little bit European-inspired.

The tricky part? Figuring out the measurements and layout for the arches. Don’t let that part intimidate you — I promise if you measure carefully, draw it out, and even tape it off visually, you can totally do this.

Step 1: Planning and Measurements

My wall is 137 inches wide, and I knew I wanted an odd number of arches (odd numbers tend to look more balanced visually). So I went with three arches across the wall.

Each arch box is 34 inches wide.
Here’s the quick math I did:

• 34 × 3 = 102
• 137 – 102 = 35 inches of total spacing
• Divide 35 by 4 = 8.75 inches between/around arches

Since I planned to add sconces outside the arches and had that uneven stone wall on the left, I adjusted slightly so the two inner spaces were 8.5 inches and the two outer ones were 9 inches. Once it’s all finished, you can’t even tell there’s a half-inch difference!

For height, I lined the top of my arches with the top of the window on the adjacent stone wall. This kept things visually consistent.

Step 2: Cutting the Arches

I used ½-inch MDF for this project because it cuts smoothly and sits flush with my ½-inch baseboards. (You can use plywood, but MDF gives cleaner edges.)

Each MDF sheet is 4′ × 8′, so I cut them down to 34-inch widths to match the arches. Because I used the top part of each arch and not the arch cutout itself, I was able to get two arches per sheet. Now the fun part cutting the perfect arch.

My Trick for a Perfect Arch

Instead of the classic string-and-pencil trick, I used a router jig method I learned from my friend Emily at @buildwith_em. If you don’t have a router, this simple jig and jigsaw method I used on these arches works well too.

Here’s how I did it:

1. My arch width is 34″, so my radius is 17″.
2. I cut a thin piece of plywood slightly wider than my router.
3. Removed the router base plate and used it as a template to drill holes in one end of the plywood and a center hole for the bit.
4. Measured down 30.5 inches from the straight edge of the MDF (17″ radius + 13.5″ arch height).
5. Drilled a small pilot hole for the jig screw and attached the plywood jig to that point.
6. Used my router with a ¼” straight bit to cut a perfect, smooth arch.

This method is fast, clean, and so satisfying — the router just glides through MDF “like butter.”

Repeat this process for however many arches you’re creating. I did three total.

Step 3: Cutting the Rectangular Sections

These pieces fill the space between the arches.

• Two 8.5-inch wide pieces for the inner sections
• One 9-inch wide piece for the outer right
• One 10-inch piece for the outer left (custom cut to fit against the uneven stone wall)

For that left edge, I traced the stone outline onto the MDF and used my jigsaw to cut the wavy profile. Once Chad grouted it later, it blended perfectly!

Step 4: Installing the Arches

I started by marking the center of the wall and lining up the center of my first arch with that mark, snug against the ceiling. Then I attached everything using my brad nailer, nailing into studs whenever possible.

You could use construction adhesive too, but the brad nails worked great for me.

After the center arch was up, I added the two inner rectangular pieces, then the outer arches, then the outer rectangular pieces — checking with my level the entire time.

Even if your ceiling isn’t perfectly level (mine wasn’t), don’t stress. The trim at the top hides any small inconsistencies.

Step 5: Filling, Sanding, and Caulking

This is where the magic happens — it’s what makes it look built in!

• Use a flexible wood filler like DAP plastic wood rather than a standard wood putty. Walls tend to have some movement, and you want to prevent cracking.
• Let it dry, sand it smooth, and repeat as needed until the wall feels like one continuous surface.
• Fill all nail holes too.
• Then, caulk all the inner edges of each arch and along the ceiling.

Take your time here — these details make the wall look custom and high-end.

Step 6: Prime and Paint

If you’re using MDF, you’ll need two or more coats of primer because MDF really soaks it up. Once it’s sealed, finish with your paint color of choice (I did three coats).

I also added a trim piece along the ceiling and right side before painting to complete the look.

Step 7: Finishing Touches

Chad grouted the corner where the arch wall meets the stone — and wow, what a difference! You’d never know how uneven that edge was before.

Then I added battery-powered wall sconces to elevate the whole space. They add the perfect soft glow at night.

The Final Reveal

I can’t even tell you how much I love this wall. The arches bring so much charm and balance — they complement our Old World European-style kitchen beautifully. It’s dramatic, yet subtle; detailed, yet timeless.

And the best part? This custom-looking, built-in feature wall cost only a few hundred dollars and a weekend of work.

It’s one of those projects where pictures don’t do it justice the texture, the depth, the light… everything works together perfectly now.

Want to Create Your Own Arch Wall?

You can grab all the supplies I used on my Lowe’s storefront 👉 Shop My Arch Wall Project

Supplies include:

• ½” MDF sheets
• Brad nailer
• Bondo wood filler
• Jigsaw
• Router + ¼” straight bit
• Level
• Caulk and primer
• Paint of choice
• Battery sconces

Tip: Don’t let the math scare you. Tape it out first, step back, and trust your eye. Once you start cutting, you’ll be amazed at how easily it all comes together.

This project has easily become one of my favorite transformations in our home, and it’s proof that you don’t need to spend thousands to make your walls feel custom built.

Looking for other ways to add arches to your home? This Arch Barn Door build was such a fun project, and this Painted Arch Wall cost me less than $50 to do!