Making a Simple Floating Shelf for a Corner

Why corners deserve a second look

In a small UK home, the corner is usually the bit we apologise for. It collects the ironing board, the vacuum cleaner and a sad stack of magazines. Yet a corner gives you two walls to fix into, which means a shelf there can carry more weight and steal less floor space than almost anywhere else in the room. A simple floating shelf — no visible brackets, no fussy supports — turns that dead angle into somewhere to stand a lamp, a few paperbacks and a mug. The whole job is a morning's work, and the thing that makes or breaks it is not the shelf but the measuring and the fixing.

Measure the corner before you trust it

Very few corners in British homes are a true 90 degrees. Old plaster, skirting boards and decades of settlement see to that. If you cut a shelf assuming a perfect right angle, you will either get a gap you can see daylight through or, worse, a shelf that will not sit flat against both walls. Start by checking the angle with a combination square or sliding bevel, and hold a piece of card or hardboard into the corner as a template. Trim the card until it sits snugly against both walls, then use it to mark your timber.

While you are there, check the walls for plumb with a spirit level, and look for cables, pipes or sockets hiding just below the surface. A quick scan with a detector takes seconds and saves a nasty surprise.

Choosing the timber and the depth

For most corners, 18mm MDF is the sensible choice: flat, stable, easy to paint and cheap. Solid pine looks warmer but moves more and needs a bit more care to keep straight. Depth is the decision that matters most. Around 200mm suits books and small boxes, 150mm is plenty for ornaments and kitchen jars, and anything over 250mm starts to feel like a shelf intruding into the room rather than tidying it.

Thickness gives the floating look. A shelf 38mm or 45mm thick reads as substantial and allows you to bore holes for rod-type hidden brackets, which are the simplest concealed fixing for a solid wall. If you want to use a thinner board, build a hollow box shelf instead: an 18mm MDF top and bottom with a front edge and internal cores, then slide it over a timber batten fixed to the wall. The batten disappears inside the box and the shelf appears to float.

Cutting for a corner pair or a single run

There are two straightforward approaches.

• A pair of shelves meeting in the corner. Each shelf is mitred at roughly 45 degrees where the two meet. Cut slightly long and slightly shallow on the angle, then creep up on the fit with a sharp plane or a sanding block wrapped in 120-grit paper. Test the joint dry, in place, before you commit.
• A single shelf running into the corner. This is the easier option and often looks cleaner. The shelf butts against one wall and runs along the other. Instead of cutting a 90-degree end, scribe it: hold the shelf in position, set a small block of timber against the wall, and run a pencil along it to transfer the wall's shape onto the end of the board. Cut to your line and sand to fit.

Whichever route you take, cut the ends with a fine-toothed saw and wrap masking tape over the cut line to reduce breakout. Sand the end grain and the front edge smooth, and ease the sharp corners with a couple of passes — it makes an enormous difference to how the finished shelf feels.

Fixing it so the brackets vanish

Mark the bracket positions on the wall with a pencil and spirit level, then drill and plug. For solid brick or block, standard wall plugs and screws are fine. For plasterboard, find the studs if you can; where you cannot, use heavy-duty cavity fixings rated well above the weight you intend to put on the shelf.

Rod brackets need holes bored into the shelf's back edge to match the rods exactly. Make a simple drilling jig from a scrap of timber so every hole is at the same height and depth, then push the shelf onto the rods with a firm, even pressure. If the fit is tight, a light tap with a rubber mallet helps. For a box shelf, screw the batten level to the wall, check it is solid by leaning on it, and slide the box over.

Finish MDF with a primer and two coats of eggshell or satinwood in a colour close to your walls. Sealing the cut edges stops them drinking paint and going fuzzy. A thin bead of decorator's caulk along the wall joint, smoothed with a finger, hides any remaining wobble in the plaster.

Living with it in a small room

Respect the weight limit and you will get years out of a corner shelf. Spread heavy items across the length rather than piling them at one end, and keep an eye on the joint where it meets the wall — a hairline crack usually means it is working loose. In a tight space, choose pale colours so the shelf recedes, keep the display to three or four objects, and leave the gap beneath it clear so the floor feels bigger. That awkward corner becomes the most useful square foot in the room.