How to Add Recessed Bathroom Storage in Older Bathrooms

A cramped, dated bathroom with no floor space for a cabinet can still gain real storage. Learning how to add recessed bathroom storage starts with looking at the wall between two studs instead of the floor, since that gap is usually just dead air doing nothing for the room.

Most interior bathroom walls are framed with 2x4 studs spaced 16 inches on center, which leaves a cavity roughly 14½ inches wide once the drywall comes off, according to a guide on in-wall bathroom storage. Depth typically runs about 3½ to 4 inches before hitting the drywall on the opposite side, per that same guide, enough for a slim shelf stack or a shallow door-front cabinet, but only on a wall that's actually been opened and checked first.

Those numbers are a starting point, not a guarantee. The only way to know what's really inside a given wall is to open a small section and look, which is exactly what the steps below cover before any real cutting happens. Budget more than a single afternoon for this project once inspection, framing, patching, paint, and drying time are all factored in.

This project sits at a beginner-to-intermediate skill level once the feasibility check below confirms an empty, non-bearing interior bay. If that check turns up anything else, this guide also covers when to stop and bring in a professional instead of working around it.

How to add recessed bathroom storage safely between studs

Before buying lumber, confirm the wall behind the drywall is actually empty. This check is what separates a straightforward weekend project from a much bigger repair, so don't skip it just because the room looks like an easy candidate.

The space above a toilet often looks like the obvious spot for a niche, but it frequently hides a vent pipe, and exterior walls are usually packed with insulation. Both are reasons the RichxTop guide suggests picking a different bay instead of forcing the issue.

Code matters too. In many jurisdictions, cutting or notching into bearing partitions is restricted, and a larger opening can trigger a permit or an engineer's review, per that same guide. Call the local building department before any cutting starts, not after the wall is already open.

Before any cutting: if a stud finder or wire detector picks up any signal in the section of wall being considered, or there's simply no confident way to rule out wiring, choose a different bay. Don't cut where wiring is suspected, and don't assume an older house follows any particular wiring pattern. A detector narrows down likely locations, but it doesn't prove a bay is empty. Only opening it and looking does that, and even then, the hole only shows what's visible right there, not what might sit higher, lower, or further back in the cavity.

Once a bay looks clear on the detector, cut a small opening, roughly 4x4 inches, through the drywall only, between two studs. Shine a flashlight inside and check for wiring, plumbing, ductwork, insulation, or fire blocking.

What turns up falls into a few categories. An empty, non-bearing bay with nothing but stray dust is a clear go-ahead. Ordinary horizontal blocking running flat across the cavity is a workable complication, one that changes shelf spacing rather than ruling out the project. Wiring, plumbing, ductwork, diagonal bracing, a metal nail-guard plate, insulation meant to stay put, or framing that doesn't match what was expected are all stop signs. Pick a different bay or call a licensed contractor rather than working around any of those.

Tools and materials for a dry recessed shelf or cabinet

Once a bay checks out clear, gather the following before opening the wall any further:

• Stud finder and wire/pipe detector
• Flashlight
• Drywall saw or oscillating multi-tool
• Level and tape measure
• Moisture-tolerant plywood or sealed solid wood for the liner box and shelves
• Wood glue and screws
• Drywall patch materials (joint compound, mesh tape)
• Paintable caulk
• Primer and paint to match the wall

Sealed and painted plywood holds up better than standard MDF in a humid bathroom, per the RichxTop guide. Bathroom humidity reaches every surface in the room eventually, not just the shower wall, and materials that can't handle steam will swell, peel, or worse, according to that same guide. That's why sealing matters even for a shelf built well outside the shower's splash zone.

Solid wood works too, but every face, especially the cut edges, needs a full seal or it will absorb moisture and swell over time, per the RichxTop guide.

Skip plain drywall as a liner if there's any chance the niche sits near a tub or shower splash zone. That material is built for standard interior partitions only, not wet zones.

This project fits a beginner-to-intermediate skill level once the inspection above confirms an empty, non-bearing interior bay. Work that touches a bearing wall, active plumbing, wiring that has to stay in place, or a wet-zone assembly is better left to a professional.

Building the between-stud bathroom cabinet or shelf

The steps below build an open recessed shelf, the simpler and more universal version of this project. A cabinet door can be added afterward using a shallow prehung door sized to the finished opening and mounted to the face frame, but fitting a door well is its own separate task, worth treating that way rather than folding it into the build below.

1. Enlarge the opening to the confirmed clear bay. Use a level to mark straight cutting lines along the inside faces of the two bordering studs, then cut along those lines. Leave the studs themselves untouched. Don't cut, notch, or remove any stud for this project, and if the opening needs framing changes to work, stop and bring in a contractor or engineer before going further.

2. Measure the actual cavity, not the assumed one. Record the real width, depth, and height, and note where any horizontal fire blocking sits partway up the bay. Ordinary flat blocking usually just means planning shelf spacing around it, or splitting the stack into two shorter sections above and below it.

3. Decide what goes on the shelves. A shallow recessed cabinet with a door suits medications and toiletries that need to stay out of sight and dust-free. Open shelving suits towels, toilet paper, and anything used often enough that a door gets in the way. Either is a solid built-in bathroom storage idea, and both have to fit inside that roughly 3½-to-4-inch depth, which favors lightweight, everyday items over anything heavy and concentrated, like large glass jars or stacks of ceramics.

4. Build a plywood liner box sized to the finished opening. The box's outer width and height should match the opening cut in step 1, minus whatever the trim or face frame will overlap along the front edges. Set the box depth to match the cavity depth measured in step 2, so the back panel lands against the drywall at the back of the cavity. There's no need to fasten into that back surface; it belongs to the neighboring wall and may have its own wiring or plumbing behind it. Check the box for square by measuring both diagonals corner to corner; matching numbers mean it's square. Sand the assembled box smooth, then seal and paint every surface, inside and out, before it goes near the wall.

5. Secure the liner to the studs on either side, not to the drywall. Drive screws through the side panels into the two bordering studs, spacing fasteners near the top, middle, and bottom of each side. Those two studs are the only confirmed solid backing in this opening. There's typically no framing behind the drywall at the top and bottom of the bay, so don't plan on fastening there. If the trim or face frame needs extra hold later, anchor it into those same two studs at the outer edges.

6. Attach shelves to the side panels using glued and screwed cleats, or dado grooves cut before assembly. Space the shelves to match what's being stored: tighter spacing for small toiletries, wider gaps for folded towels. There's no rule requiring even thirds.

7. Patch the drywall edge and finish the face. A thin face frame or trim, glued and nailed around the opening, covers the cut edges cleanly. A mitered casing kit or a flush inset front works too. Shim behind the frame if it doesn't sit flush with the surrounding wall, and fix that now rather than trying to caulk over a gap later. Caulk the perimeter, then prime and paint to match.

Before loading anything onto the shelves, press on the installed box to check for flex, confirm the trim sits tight with no visible gap behind it, and let the paint and caulk cure fully per the product label.

Why bathroom wall niche storage in a shower needs a different plan

Everything above assumes a standard interior wall outside the shower or tub. That assumption stops the moment the wall in question is part of a shower or tub surround, and the project changes completely at that point rather than just getting bigger.

A niche inside a shower or tub needs a true tile backer, cement board or an approved foam backer, in place of regular drywall, according to the RichxTop guide. Waterproofing there is a full system rather than a single material: liquid-applied, fabric-reinforced, or sheet membranes each come with their own manufacturer instructions that need to be followed exactly, per that guide. Preformed niches from tile-system manufacturers can simplify the job, but only when installed correctly, not as a shortcut around the waterproofing steps.

Retrofitting a niche after tile is already up means tearing that tile out and rebuilding the waterproofing layer from scratch, according to the same guide, which is why the location needs to be decided before tile work ever starts.

If the storage space under consideration sits inside a shower or tub surround, hand this one to a licensed tile installer or contractor who works with waterproofing systems regularly. Improvising a wet-zone niche is how leaks end up inside the wall cavity instead of staying visible on the tile face.

Getting the built-in right the first time

A finished recessed shelf should sit flush with the surrounding wall, hold steady without flexing when pressed, and show clean caulk and trim lines with no visible gaps. Before calling it done, set the actual items being stored on the shelves and confirm nothing overhangs the opening or blocks a door or drawer front from closing.

Wipe the shelf down as part of normal bathroom cleaning rather than leaving it untouched between deep cleans. Humidity settles on every surface in the room, sealed or not. If the caulk line ever cracks or starts pulling away from the wall, scrape out the old bead and recaulk before moisture works its way behind the trim.

Trim profile, hardware finish, and exact shelf count are personal preference and not worth agonizing over. What determines whether the storage lasts is the framing check done before any cutting, screws driven into the two bordering studs rather than drywall alone, and a sealed finish on every wood surface before installation.

If a fuller bathroom renovation with new tile or drywall is already planned, mark the storage location before that work begins. Adding a niche afterward means cutting into finished surfaces instead of building into a wall that's already open.