Why Alcoves Are Worth the Bother

Almost every older British home has one: a narrow recess beside the chimney breast, too shallow for a wardrobe, too deep to ignore. In a Victorian terrace or a 1930s semi, these alcoves are often the only usable wall space in a small sitting room. Left alone they collect dust, cables and a stray lamp. Shelved properly, they become the best storage in the house — and the fact that they are awkward is exactly why they are worth doing well.

The trouble is that alcoves are rarely square. Walls bow, plaster thickens in the corners, and the two sides are seldom the same depth. Skirting boards and picture rails stop and start at odd heights. None of that is a problem if you plan for it, and the approach below is forgiving enough for a first-timer with a drill and a borrowed saw.

Measuring an Alcove That Isn't Square

Resist the urge to take one measurement and ring up a timber merchant. You need a picture of the whole recess, not a single figure.

• Measure the width at the back, the middle and the front. The narrowest figure is the one that matters.
• Measure the depth on both sides and at three heights. Timber shelves cut to the deepest point will wobble against the shallowest.
• Check the height of the alcove and note anything that interrupts it — a gas meter, a radiator pipe, an awkward socket.
• Test the walls with a spirit level. A 5mm bow over a metre is normal in an old house and needs scribing, not swearing.

Cut a template from hardboard or thin MDF and offer it up to the walls at each shelf height. Trim it with a plane or a rasp until it fits snugly, then use it to mark out your real boards. It sounds fussy; it saves a wasted sheet of timber every time.

Battens: The Backbone of a Sturdy Shelf

Forget floating brackets and fancy hidden fixings. In an uneven alcove, timber battens screwed to three walls are stronger, cheaper and far more forgiving. They follow the wall's irregularities, and the shelf simply sits on top.

Use 25mm x 50mm planed softwood, cut a few millimetres short of each wall run so it doesn't jam. Fix with masonry screws and plugs into brick or block, or with proper cavity fixings if you are drilling into lath and plaster — that old plaster will crumble if you over-tighten, so drill gently and use a slow speed.

Space the battens so the shelf has support at both ends and along the back. For anything wider than about 900mm, add a central batten or a vertical divider, otherwise the shelf will sag within a year — a shelf carrying paperbacks is under real load, and 15mm board is not enough. 18mm MDF or 18mm pine is the sensible minimum, and thicker is better for long spans.

Cutting and Fitting the Shelves

Mark each shelf individually from your template. Cut a fraction oversized and sneak up on the fit with a plane or a belt sander rather than trying to correct a board that is too short. Where a wall bows, scribe the shelf end: hold a small offcut against the wall, run a pencil along it, and cut to that line. The gap disappears and no filler is needed.

Spacing depends on what will live there. As a rough guide:

• 300–350mm for hardbacks and standard paperbacks
• 250mm for a run of paperbacks only
• 400mm or more for box files, baskets and decorative odds and ends

Set the lowest shelf high enough to clear the skirting, and keep the top shelf roughly level with the picture rail if you have one. Fix each shelf down through the batten with a couple of countersunk screws, or simply rest it — a snug shelf on three battens rarely moves.

Painting for a Built-In Look

This is the step that turns a DIY job into joinery. Sand the shelf edges, then seal any MDF edges with a dedicated primer — they soak up paint like a sponge and stay fuzzy otherwise. Fill screw holes and caulk the join between shelf and wall with a paintable decorator's caulk. Run a thin bead, smooth it with a damp finger, and let it dry fully.

Then paint everything — battens, shelves and the alcove walls behind them — in the same colour as your walls. A durable water-based eggshell in a matt or low-sheen finish works well and wipes clean. Two coats, lightly sanded between, and the shelves will read as part of the room rather than something added to it. If you want a little definition, use the wall colour on the shelves and a shade or two darker inside the alcove itself.

Finishing Touches and Common Mistakes

Give the paint a full week to harden before loading the shelves, and use a scrap of card under heavy items for the first few days. Add a small trim or a strip of moulding along the front edge if you like a more traditional look, and consider a discreet LED strip tacked under the bottom shelf for a warm glow in the evening.

The mistakes to avoid are consistent: shelves too thin, battens too few, paint too glossy, and measurements taken in a hurry. Get those four right and an awkward alcove becomes the most useful corner in the house — and the one guests assume was always there.