Build a Corner Banquette With IKEA KALLAX Units in 9 Steps for 35% More Seating

Why the KALLAX 2x2 lands at 39 cm seat height

A seated adult needs a finished cushion height between 43 and 48 cm for a dining bench, based on dimensions published in joinery handbooks. The KALLAX 2x2 carcass measures 77 cm on each side and 39 cm deep. Tipped onto its back, the 39 cm depth becomes the seat height, and a 5 cm to 8 cm foam cushion lifts the finished surface to roughly 44 to 47 cm. That figure sits inside the comfortable range without any plinth.

Two units meeting at a corner give a continuous seating run of about 154 cm along each wall before the cushions overlap. A standard 120 cm dining table seats four on chairs. Replacing the two chair sides with the banquette frees floor area and seats five to six people across the bench, which is where the 35% capacity figure comes from in fitter estimates. The open cubes face outward into the room, holding shoes, table linen, or board games. Each cube clears 33 cm by 33 cm internally, enough for the standard IKEA DRONA fabric box.

Materials and the cut list before any drilling

Start with two KALLAX 2x2 units in the same finish, white or oak effect being the most stocked. You will need one sheet of 18 mm birch plywood cut to two seat tops, each 78 cm by 40 cm, leaving a 1 cm overhang on the front edge. A timber merchant cuts these to size for a small fee, which removes the need for a circular saw at home.

For the cushions, order two pieces of 50 mm high-density foam at 76 cm by 38 cm, plus a metre of 2 cm batting to soften the edges. Upholstery fabric in a 140 cm width covers both seats from 1.5 linear metres. Fixings: eight L-brackets rated for 20 kg each, sixteen 30 mm wood screws, and a tube of grab adhesive. A KALLAX 2x2 holds 13 kg per shelf according to IKEA load figures, so the carcass itself carries a seated adult without reinforcement when laid on its back and screwed to the wall.

The reclaimed pine shelf finish many builders favour for the seat top, a coat of hardwax oil rubbed in and buffed, also works on birch ply and resists spills better than paint on a surface people sit on daily.

The 9 steps, start to bench

Step one: assemble both KALLAX 2x2 units flat on the floor following the IKEA instruction sheet, but do not fit the back panel pins until both carcasses are square. Step two: lay each unit on its back so the open cubes face up and the 39 cm dimension stands vertical.

Step three: position the first unit against the longer wall, tight into the corner. Step four: butt the second unit against the first at 90 degrees, so the end panels meet. Mark where the two carcasses touch.

Step five: join the two units at the corner with two L-brackets on the inside faces, screwed with 30 mm screws into the 15 mm particleboard. Step six: fix each unit to the wall through the rear panel into studs or with heavy-duty cavity anchors, using the remaining L-brackets. This wall fixing is what stops the bench tipping when someone leans on the backrest.

Step seven: lay the birch ply tops over the open cubes, glue with grab adhesive along the carcass edges, and weight them overnight. Step eight: glue the foam to the ply, wrap the batting over the front edge, and staple the fabric underneath, pulling corners tight first. Step nine: drop the finished cushions onto the tops. They sit by gravity and lift off for cleaning.

A wall mounted shelf installation above the bench, fixed at 140 cm from the floor, clears the head of a seated person and holds the items the cubes cannot.

Sealing the seat top against daily spills

Birch ply drinks water at the end grain. A spill that sits overnight raises the fibres and blackens the edge within a week. Two coats of Lithofin tile sealer, despite the name, penetrate raw timber and leave a matt water-repellent layer that beads coffee long enough to wipe it. Apply with a lint-free cloth, wait 15 minutes, and buff the surplus before it dries to a haze.

For the exposed cube edges that take knocks from shoes and boxes, a harder film helps. Lithofin works for the horizontal seat where flexibility matters, but a vertical edge benefits from the reclaimed pine shelf finish approach: hardwax oil cut 10% with white spirit for the first coat so it sinks in, then a neat second coat. The result wipes clean and touches up without sanding back, which matters on a surface that meets a mop weekly.

Test any sealer on an offcut first. Birch ply from different mills takes oil unevenly, and the offcut tells you the colour shift before it lands on the visible top.

Painting the carcass to match the room

KALLAX laminate resists ordinary emulsion, which peels at the first knock. A bonding primer such as Zinsser B-I-N grips the melamine surface, and over it the chalk-finish ranges hold well. Little Greene paint shades in the Intelligent Eggshell line wipe clean and suit a seat-side surface that fingers touch. French Grey or Slaked Lime read soft against most kitchen joinery.

Two thin coats over primer beat one thick coat every time on laminate. Roll the flat faces with a 4-inch foam roller and cut the cube edges with a 25 mm angled brush. Leave four hours between coats at room temperature.

A worked example: 120 cm kitchen, four chairs to a six-seat corner

Take a galley-end kitchen with a 120 cm by 80 cm table pushed into the corner and four matching chairs. The two chairs on the wall sides each occupy about 45 cm of seat width and need 40 cm of pull-out clearance behind them, so 85 cm of floor depth is committed per chair just to sit down. Removing those two chairs reclaims that pull-out zone entirely, because a banquette seats from the front with no rearward swing.

The two KALLAX runs give 154 cm of bench per wall. Along the 120 cm table edge, that bench seats three adults at 50 cm each with room to spare, against the single chair it replaced. The perpendicular run seats two more. Four chairs became a five to six person corner, and the original chair footprint of roughly 1.7 square metres of swing space drops to zero.

Material cost runs to two KALLAX 2x2 units at around 55 pounds each, a half-sheet of birch ply at 35 pounds, foam and fabric near 40 pounds, and fixings under 15 pounds. The total sits close to 200 pounds for seating that a fitted joiner would quote at three to four times that. The eight cubes underneath, eight at 33 cm square, also absorb the storage a pair of chairs never offered.

What the cube depth costs you

The 39 cm seat depth is shallow for lounging. It seats you upright at a table, which is the point, but it will not take a deep slouch the way a 55 cm sofa-depth bench would. That trade is fixed by the KALLAX dimension and no cushion depth recovers it.

The unanswered question is the backrest. A dining banquette wants a reclined back panel at about 100 degrees, and the KALLAX carcass gives you a flat vertical wall and nothing more. Whether you mount an angled padded panel to the wall above the seat, or live with a straight back and a few loose lumbar cushions, changes both the comfort and how far the table must sit from the wall to leave knee room. That geometry is worth drawing on paper before the brackets go in.