DIY Drywall Closet Under the Stairs | Step-by-Step Guide 2026

Transforming the awkward space under your stairs into a functional closet or storage room is a brilliant DIY project. Using metal studs and drywall, you can create a custom drywall closet that fits perfectly, adding both value and organization to your home. This guide walks you through the process, from planning to finishing touches.

Adapting the Design to Your Space

Every under-stair area is unique, which is why drywall is the perfect material for this job. It allows you to adapt seamlessly to angled ceilings and irregular walls. In our project, we first used drywall panels to hide the staircase itself, creating a sloped ceiling and a triangular half-wall. We then extended that wall to fully separate the under-stair area from the hallway. For all your home improvement supplies, including drywall tools and metal profiles, check out our curated collection.

Building the Storage Room Wall

To create a proper storage room or closet, you’ll need to build a new partition wall. This wall connects to the existing structure and incorporates a door frame. The back wall of the closet is formed by the staircase enclosure itself. To get the perfect depth for your wardrobe, you’ll build two side jambs and a header, all using the same metal stud and drywall system. This creates a clean, recessed space for your closet. Don’t forget to browse our sheds and storage solutions for additional organization ideas.

Creating the Closet Side Wall (Spallina)

The side wall, or “spallina,” is crucial for defining the closet’s depth. Measure the desired depth of your wardrobe (typically 60cm for hanging clothes) and build a frame from metal profiles. Attach it to the floor, ceiling, and existing wall. Cover it with drywall sheets, then tape and mud the joints. For a professional finish, consider adding wall decor or a fresh coat of paint.

Framing the DIY Closet Niche

With the side wall in place, you now have a recessed niche for your closet. The ceiling of this niche will follow the slope of the stairs. Use a level to mark the horizontal lines for the header and the vertical lines for the side jambs. Cut your metal studs to size and screw them together. This frame will support the drywall and the closet door. Enhance your new closet with practical lighting solutions to make it easy to find what you need.

Reinforcing the Corners

To protect the corners of your new drywall closet from bumps and dings, install metal corner beads. These are nailed or screwed onto the outside corners before the final coat of joint compound. They create a sharp, durable edge that will last for years. Once the compound is dry, sand it smooth and prime the walls. For a complete look, add a stylish rug at the entrance to tie the space together.

FAQ

What tools do I need to build a drywall closet under the stairs?

You’ll need a tape measure, level, utility knife, drywall saw, screw gun, metal snips, a T-square, and a drywall rasp. For finishing, you’ll need joint compound, drywall tape, a taping knife, and sandpaper. Find all these and more in our home improvement collection.

How do I handle the sloping ceiling inside the closet?

Measure the height at several points along the slope and transfer those measurements to your drywall sheets. Cut the drywall with a utility knife and snap it along the cut line. You can also use a drywall saw for curved or angled cuts. This is where the flexibility of drywall really shines.

Can I install a standard closet rod and shelves?

Absolutely. Once the drywall is finished, you can install a closet rod and shelves just like in any other closet. Use appropriate anchors or screw directly into the metal studs for heavy loads. For a complete wardrobe setup, consider matching dressers or nightstands to complement your new closet.

How do I ensure the closet is square and level?

Use a level constantly during the framing stage. Check that your vertical studs are plumb and your horizontal tracks are level. Measure diagonally from corner to corner to ensure the frame is square before screwing everything together. A little patience here pays off with a professional result.

What type of door should I use for the under-stair closet?

Pocket doors or sliding barn doors are great space-saving options. A standard hinged door also works if there is enough clearance. You can also install bi-fold doors. The choice depends on your space and style. Browse our curtains for a soft alternative to a traditional door.

Final Touches for Your DIY Closet

• Prime and paint the drywall to match your existing walls. A light color will make the small space feel larger.
• Install a mirror on the inside of the closet door for a convenient dressing area.
• Add shelving and storage bins to maximize every inch. Our bookcases and shelving units can be adapted for closet use.
• Consider a small desk or work surface if the space allows, turning the closet into a tiny home office.
• Use outdoor lighting or battery-operated puck lights for an easy, no-wiring lighting solution inside the closet.

With careful planning and the right materials, you can turn that wasted space under your stairs into a beautiful and functional part of your home. Happy building!

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