DIY Room Divider Wall: How I Split One Big Bedroom Into Two Spaces

Bedroom, DIY

Published September 27, 2026

While we were visiting family in Utah, I took on my sister’s bedroom, and the star of this whole makeover is a DIY room divider wall. Her bedroom is HUGE. And while that sounds like a dream, a room that big can actually be hard to use well.

Alt text: Framed DIY room divider wall standing on new wood-look plank flooring, separating the bedroom from the back office area with its windows and a wooden desk holding a drill.

So we did something a little unexpected. We built a wall to divide it into two spaces, but we didn’t add any doors. It’s still one room. It just finally has a front and a back. This is part one of the series, and today I’m walking you through the whole framing process, from prepping the floor to getting the wall up and solid.

Table of Contents

The Before: One Really Big Room

Here’s what we started with. The front half was the bedroom, and the back half by the windows had become the spot for everything that didn’t have another home. A desk, weights, a walking pad, bookshelf, and more. You know the corner. We all have one.

Long, open bedroom before the renovation, with carpet in the front sleeping area and wood flooring in the back, where a desk, weights, a walking pad, and a plyo box sit in front of the windows.

The Plan: Divide the Room Without Closing It Off

The idea was simple. Build a wall across the room with open space on both sides, so the front half becomes the bedroom and the back half becomes an office. The back half is big enough that you could even put a bed on the wall facing the windows. We’re planning ahead and leaving room for however they want to rearrange in the future.

No doors, no hallway; we’re just building a wall that visually separates the two spaces. I sketched it right on a photo of the room so we could all picture where it would go. Then I made an AI rendering to get a feel for the finished look.

Large bedroom with the carpet pulled up to the concrete subfloor and a red hand-drawn outline showing where the room divider wall will go, with a woman sitting in a leather armchair and a young helper standing nearby.
AI-generated rendering of a finished room divider wall in a warm neutral paint, with crown molding, a framed landscape painting, and dark plank flooring, open on both sides to the windows behind it.

The photo on the right is AI-generated, not real, and not even proportionate, but it’s still helpful for inspiration. Curious how I use AI to picture my projects before I build them? I have a blog post explaining how – Using ChatGPT for Interior Design Help.

What You’ll Need for a DIY Room Divider Wall

Good news: framing a wall doesn’t take a fancy workshop. Here’s everything I used. How many 2x4s and screws you’ll need depends on the size of your wall, so measure your space and grab a few extras. Trust me, you’ll always need one more 2×4!

Materials

Tools

Step 1: Replace the Flooring

This room had carpet in half the bedroom and laminate in the other half, so before we built anything, we removed it all and installed new flooring. Since the house is on a slab foundation, I laid down a moisture barrier over the concrete first, then got to work.

Bare concrete slab partly covered in a black plastic moisture barrier, with freshly painted white walls and an open door, as the flooring gets replaced before the room divider wall goes in.
Crystel kneeling in front of a white door, fitting a wood-look plank into place over the black moisture barrier, with a cut piece of flooring and a marker on the finished floor beside her.

I love this flooring. It’s the same flooring that we added to the entire first floor of our home in St. Louis, and we couldn’t be happier with it. It’s waterproof, scratch-resistant, and absolutely beautiful. Check it out here!

I’ve already shared posts with full flooring installs, so if you want the step-by-step, check out Simple DIY Duravana Plank Flooring Installation and How I Installed Laminate Kitchen Flooring.

Step 2: Cut the Flooring Where the Wall Will Sit

Since this is a floating floor, I couldn’t just build the wall right on top of it. Floating floors need room to expand and contract, and pinning them under a wall is a recipe for buckling. So I traced my 2×4, cut out a strip, and set the wall right on the slab.

First, I laid a 2×4 where the wall would go and traced along it.

Crystel bending over a 2x4 laid on new wood-look plank flooring, tracing along its edge to mark where the room divider wall will stand.

Then I cut along the line with a circular saw. Wear your ear protection and safety glasses, friends. Your future self will thank you. Finally, I pried up the strip of flooring down to the moisture barrier.

Crystel wearing ear protection and running a circular saw along the traced line in the plank flooring, with sawdust scattered across the floor and a wooden desk in the background.
Crystel using a hammer to pry up the cut strip of flooring, exposing the black moisture barrier underneath, with the circular saw resting on the floor nearby.

Step 3: Add Blocking in the Ceiling

Next up, the ceiling. The top of the divider wall needs something solid to screw into, and you won’t know what’s up there until you look.

I drove a screw up through the ceiling right where the wall would go.

Crystel on a ladder driving a screw up through the textured ceiling with a yellow drill, marking where the top of the room divider wall will attach.

Then I climbed up the ladder and into the attic to find it. Nothing says glamorous DIY quite like crawling around an attic in sandals.

Crystel standing on a wooden stepladder in sandals, pulling herself up through the attic access opening in a closet ceiling to find the screw marking the room divider wall location.
Crystel's hand pointing to a screw tip poking up through the back of the ceiling drywall in the attic, with spray foam drips on the surface around it.

Our DIY room divider wall runs right between two trusses, so there was nothing to attach it to. The fix is blocking. I cut 2x4s to fit between the trusses and screwed them in place, giving the top of the wall something solid to grab onto from below.

Crystel crouched between the attic trusses under spray foam insulation, installing a 2x4 between the truss bottoms so the room divider wall has something solid to attach to from below.

Step 4: Build the Wall Frame on the Floor

With the floor and ceiling ready, I built the wall frame flat on the floor. It’s so much easier than trying to build it in place. You’ve got a top plate, a bottom plate, and studs in between.

Crystel kneeling on the new plank flooring, screwing 2x4 studs to the top plate as she assembles the room divider wall frame flat on the floor.
Finished wall fame built and ready to be raised.

Step 5: Raise the Wall and Secure It

This is the fun part! With a little help, we tilted the frame up into place.

Crystel and a helper in a red shirt tilting the framed wall upright and guiding its top plate toward the ceiling.

I attached the top plate through the ceiling into the blocking that I added in the attic. Then I anchored the bottom plate right into the concrete slab where I’d cut the flooring away. For concrete, you’ll want self-tapping masonry screws. Regular wood screws are perfect for attaching the top plate, but won’t cut it here. Be sure to pre-drill your holes in the 2×4 first.

Crystel on a yellow ladder driving wood screws through the top plate into the ceiling blocking while her helper watches from below.
Crystel wearing ear protection and driving a self-tapping masonry screw through the bottom plate into the concrete slab where the flooring was cut away.

And just like that, we had a wall! We could’ve stopped right there. In fact, my original plan WAS to stop there. You saw the inspiration photo. But then we got to thinking… how awesome would a fireplace be? So we took it one step further and framed in for an electric fireplace insert.

Freestanding stud frame for a DIY room divider wall, secured at the ceiling and floor, with the office area, windows, and wooden desk visible through the open studs.

Step 6: Frame for the Fireplace Insert

First, I built the fireplace frame on the floor, starting with an outer box and an inner box, then joining them with cross braces.

Two rectangular 2x4 frames laid flat on the plank flooring, one nested inside the other, as the framing for a fireplace insert takes shape in front of the standing room divider wall.
Crystel leaning over the fireplace insert frame on the floor, driving screws to join the inner and outer 2x4 boxes with cross braces, with a drill and tape measure beside her.

Then, I cut out another section of flooring in front of the wall. This cleared space for the fireplace framing and left room for a hearth that we’ll add later.

Crystel wearing ear protection and running a circular saw through the plank flooring in front of the framed room divider wall, with sawdust and screws scattered nearby.
Crystel pulling up a section of cut plank flooring in front of the wall frame, revealing the black moisture barrier underneath.
Rectangle of flooring removed in front of the stud frame down to the black moisture barrier, clearing space for the fireplace framing and a future hearth.

To bump the fireplace framing out from the wall, I added 2×4 blocks at the bottom. How far you bump it out depends on how much room your insert needs, so check the manufacturer’s specs before you build.

I also added a 2×4 across the studs, sitting at the same height as the top of the fireplace framing,

Room divider wall frame with a horizontal 2x4 across the studs and short 2x4 blocks set out from the bottom plate onto the moisture barrier, while a young helper plays with the fireplace insert frame in front.

Finally, I set the fireplace frame in place and checked that it was level before screwing it in with my drill. I attached it from the front into the blocks at the bottom and added blocks just under the top of the frame that tie back to that horizontal 2×4.

Crystel holding a yellow level against the fireplace insert frame, now attached to the bump-out blocking on the front of the room divider wall, with a drill resting on top of the frame.
Crystel crouching beside the fireplace insert frame and driving a screw through its base into the bump-out blocking, with a yellow level on the moisture barrier beside her.

Future-Proof Your DIY Room Divider Wall

Here’s my biggest tip for any wall you build: plan ahead while the studs are still exposed. Once the drywall goes up, adding support gets a lot harder.

Think about where you might want lights, heavy artwork, floating shelves, a TV, or outlets, and add blocking there now. It takes a few extra minutes and a couple more 2x4s, and it saves you a big headache later. I added extra blocking between the studs where I knew we would need it, and we were done with the initial wall framing.

Where We’re Leaving Things Off

Alt text: Framed DIY room divider wall standing on new wood-look plank flooring, separating the bedroom from the back office area with its windows and a wooden desk holding a drill.

And that’s where we’re pausing for now! The wall is up, it’s solid, and you can already see how it’s going to turn this big room into two separate spaces. But trust me, we’re just getting started. Next up, I’m framing the arches (my favorite part, and I can’t wait to show you how I did it!). After that comes drywall, then the fireplace insert, mantel, and surround, some gorgeous trim, and finally the big reveal. I’ll link each post here as it goes live, so pin this one or bookmark it and follow along!

📌 Pin This DIY Room Divider Wall for Later

Got a big room that feels more awkward than awesome? Save this DIY room divider wall to your favorite Pinterest board so you have the steps handy when you’re ready to build your own. And while you’re there, come follow along for the rest of this makeover!

DIY Room Divider Wall FAQ

Can you build a wall on top of a floating floor?

No. Floating floors need room to expand and contract, and a wall pinning them down can cause buckling. Cut out the flooring where the wall will sit and attach the wall directly to the subfloor or slab.

How do you attach a wall to the ceiling if there’s no joist or truss above it?

Add blocking. Go into the attic, find the spot where your wall will be, and screw 2x4s between the trusses or joists. That gives the top plate something solid to attach to from below.

What screws do you use to attach a wall to a concrete slab?

Use self-tapping masonry screws. They’re made to bite into concrete, which regular wood screws can’t do.

Is it easier to build a wall frame on the floor or in place?

On the floor! Build the frame flat, then tilt it up into position and secure the top and bottom plates. A second set of hands makes the lift much easier.

Should you add blocking before drywall?

Yes. Adding blocking while the wall is open makes it easy to hang lights, heavy art, or shelves later.

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