How to Build a Closet with a Slanted Ceiling (Attic Knee-Wall Closet Guide)
Article may have affiliate links. If you make a purchase, I may earn a tiny commission at no extra cost to you. Big thanks for supporting my small business.
If you’ve ever stared at a sloped ceiling and thought “there’s literally no way a closet will fit here,” I’ve been there and I’m here to show you how to build a closet with a knee wall.
I had the same thought looking at our attic eaves. That weird triangular space where the roof meets the floor? Yeah, that one. The spot that’s too short to stand in but somehow takes up half your room.
But here’s the thing—those awkward eaves are actually storage goldmines if you’re willing to think sideways (literally). We needed somewhere to stash toys, seasonal clothes, and all the office gear that was taking over our bedroom. The closets downstairs were maxed out, and the attic felt like wasted space.
This loft makeover started during a big life reset after my divorce and turned into my lady loft. If you are new, you can catch that story here and the master bedroom paint here.
Tools Needed
- Miter or circular saw (keep one set at an angle)
- Drill or drywall screw gun
- Nail gun and finish gun
- Stud finder, bevel gauge, tape measure
- 4’ and 2’ level
- Chalk line and utility knife
- Safety gear: glasses, mask, hearing protection
Materials
- 2x4s for plates and studs (16″ on center)
- 1/2″ drywall and 2″ drywall screws
- Joint compound and tape
- 3.5″ colonial casing or trim to match existing
- Door + hardware: 36″ bifold or double swing
- Wire shelf and closet rods
How to Build a Closet Under a Slanted Ceiling
Plan the footprint!
Pick the tallest wall section for your doorway. Keep depth between 24″–30″ so hangers clear the back wall. Snap chalk lines on floor and ceiling.
Step 1: Layout and set plates
Mark the floor where the wall will go. Nail the bottom plate to the floor and the top plate to the slanted ceiling. Use a level to keep the wall plumb.
Step 2: Cut studs to fit slope
Use a bevel gauge to copy the ceiling angle. Cut studs and install every 16″ on center.
How to Frame a Closet Door
Step 3: Frame doorway
Frame a 36″ opening at the tallest point. Add king and jack studs. Check header clearance against slope.
Door options: Bifold if wall space is tight. Double swing for full access. Barn door if you have clearance.
Step 4: Drywall and finish
Cut drywall to fit slope. Fasten with 2″ screws. Tape and mud seams, then paint to match ceiling.
By the time we were done, I was pretty sure we’d earned a free gym membership because 38 stairs × 25 trips hauling wood is basically CrossFit with 2x4s! 😉
If you want doors that are not bifolds, see how we installed french closet doors.
This was such a fun project to do with my dad! He always is game for my DIY adventures :).
Storage Solution Tips for Knee-Wall Closets
- Rod heights: 66″ single, or 40″ + 80″ for double hang
- Top shelf: 12–16″ deep over rod
- Low shelves: 12″ deep under slope for shoes/bins
- Hooks: inside door frame for bags
- Lighting: add battery puck lights if wiring is tricky
Budget-Friendly Closet Systems for Slanted Ceilings
Once you finish framing the exterior walls of your closet on the sloped ceiling, you’ll want to make the inside functional.
A simple way to do that is with modular closet components. IKEA sloped ceiling closet hacks are popular because you can cut or adjust pieces to fit tight roof angles.
If you’re on a budget, look at the IKEA PAX system.
The PAX frames and drawers can be tucked under the slope, while rods and shelves fill the taller side for hanging clothes.
Another option is to use IKEA slanted ceiling closet inserts like wire baskets or open shelves to maximize every inch.
Time, Cost, Skill Level
- Time: One day for framing/drywall hang. Another for mud and paint.
- Cost: Depends on size—budget for studs, drywall, door, trim, shelving.
- Skill: Intermediate DIY. Comfort with saw angles and framing helps.
Related Projects
- Install French closet doors on a slanted ceiling (these are the doors we installed)
- Barn door install without removing trim (a sliding option that takes up no space)
- Lady Loft before and after reveal (our loft full tour)
Meet Jessica
What started as a hobby, Jessica’s blog now has millions of people visit yearly and while many of the projects and posts look and sound perfect, life hasn’t always been easy. Read Jessica’s story and how overcoming death, divorce and dementia was one of her biggest life lessons to date.
Thanks for documenting this! I have a similar space and needs, so this was very helpful! And…manicures are always appropriate lol
haha yes Alexandra! I was baffled by what to do for a while with the loft space but a built in closet worked perfectly! 🙂
Thanks for sharing this. How do you determine the angle of the ceiling in order to make the 2×4 cuts correctly for framing? That angled cut is a challenge. And when anchoring the first board to the ceiling, how do you determine where the supports are to nail into?
I’m not lucky enough to have a handy dad, so I have to figure it all out by myself. Any additional tips are appreciated!
Thanks!