2 Metres of Bench Seating Built from Two Besta Frames and a Karlby Worktop

The 40 cm Gap Between Two Frames and a Wall

A single Besta frame measures 120 cm wide, 42 cm deep, 38 cm tall. Two of them butted end to end give 240 cm, which overshoots a 200 cm alcove by 40 cm. The reverse problem is more common: a wall run that is 200 cm demands either one 180 cm frame plus filler, or two 120 cm frames trimmed. Trimming a Besta carcass is not practical because the panels are 16 mm melamine-faced particleboard with pre-drilled 32 mm system holes, and cutting through them destroys the shelf-pin grid.

The workable configuration for a 200 cm run uses a 120 cm frame and a 60 cm frame side by side, giving 180 cm of carcass, then closes the remaining 20 cm with a return panel or a fixed timber cheek. The Karlby worktop, sold in 246 cm and 186 cm lengths in 38 mm oak or walnut veneer, gets cut to the full 200 cm span so the seat reads as one continuous surface bridging the joint. That overhang, roughly 10 cm at each visible end, is what hides the frame seam and gives the bench its built-in look.

Anchoring: the Detail That Decides Whether It Is Furniture or a Fixture

Besta frames ship with a metal restraint strap intended to stop tip-over. For a bench that people sit on and drag across, the strap is not enough. The seat sees dynamic load: a 90 kg adult dropping onto a 42 cm deep cantilever puts a rotational force on the front edge that a wall strap does nothing to resist. The fix is to treat the assembly as a fitted unit and screw the rear carcass rail directly into the studs with four 6 x 80 mm structural screws per frame, located with a stud detector rather than guessed.

Where the wall is masonry, 8 mm frame fixings into the mortar bed hold better than the brick face. The plinth carries the vertical load. A 200 cm bench with people and cushions can reach 200 kg loaded, and 16 mm particleboard base panels flex under that if they float on adjustable feet. Building a 30 to 40 mm softwood plinth frame under both carcasses, glued and screwed, transfers weight to the floor across the full footprint and takes the sag out of the base. This is the single change that separates a bench that survives ten years from one that racks and gaps at the joint inside two.

Doors, Drawers and the 20 cm Filler Problem

The 20 cm left over on a 200 cm run has three honest solutions. First, a fixed timber cheek finished to match the Karlby, which reads as a deliberate end return and gives a spot to run a cable or hide a socket. Second, a shallow open cubby with no door, useful for shoes if the bench sits in an entry. Third, and least tidy, a Besta 20 cm filler is not a stock item, so the panel has to be cut from a spare 60 cm side, edge-banded on the exposed cut with iron-on veneer tape, and the raw edge hidden toward the wall.

Inside the frames, the choice is doors or drawers. Besta drawers with the Sindvik or Selsviken fronts run on integrated soft-close runners rated to a stated 15 kg per drawer. For seat storage that gets sat on, drawers are the wrong call: pulling a loaded drawer while someone sits above stresses the runner geometry. Hinged doors or open cubbies with baskets take the load better. Kallax inserts, the 33 x 33 cm fabric boxes, do not fit a 42 cm deep Besta cleanly, so anyone hoping to reuse existing Kallax organiser bins should measure before buying. The depth mismatch is the reason so many hybrid builds end up with a gap behind the box.

A Cheaper Route Nobody Costs Out

The worktop is the single most expensive line. A Karlby in oak runs a large share of the total, and cutting a 246 cm length down to 200 cm wastes 46 cm of veneered timber. Two 120 cm Besta frames plus one Karlby, plus hinges, doors, plinth timber and fixings, lands the whole bench in the 220 to 260 range in most markets, against 550 to 700 for a retail storage bench of the same footprint.

The hidden saving is the offcut. That 46 cm of 38 mm oak-veneered worktop is exactly the right size for a matching floating shelf above the bench, or a windowsill, or the fixed end cheek from the filler problem. Costing the build as one worktop yielding two finished surfaces changes the maths: the effective seat cost drops because the offcut would otherwise be a 40 shelf bought separately. Anyone building two benches in a hallway should buy the 246 cm Karlby once and yield both seat surfaces plus a shelf, wasting almost nothing.

Finishing the Seam and the Cut Edge

One detail decides whether the bench looks bought or bodged: the cut end of the Karlby. The factory edge is sealed veneer; the sawn end is raw. It needs edge-banding tape ironed on and trimmed flush, then oiled to match, or the pale exposed core telegraphs the cut from across the room.

Where Chalk Paint Earns Its Place, and Where It Does Not

A chalk-paint finish, Annie Sloan or Rust-Oleum, adheres to the melamine Besta fronts without priming, which is why the dresser-makeover crowd reaches for it. On a bench seat it fails fast. Chalk paint stays porous until sealed with wax or a polyacrylic topcoat, and a seat is the highest-abrasion surface in the house. Wax finishes mark under body heat and cushion friction inside a season.

The defensible use is the frame ends and the doors, the vertical surfaces that never take a seated load, painted in a muted colour to break up the run of oak. Seal those with two coats of water-based polyurethane, not wax, and the finish holds. The Karlby seat itself stays as oiled veneer, because no paint system survives the cushion-drag and heel-scuff a bench collects, and stripping a failed painted seat back to bare veneer is a worse job than never painting it. The colour break belongs on the fronts, and the working surface stays timber.

What the Build Does Not Solve

Every version of this bench assumes a flat, plumb wall and a level floor, and most rooms have neither. A 200 cm run against a wall that bows 8 mm in the middle leaves a visible gap behind the Karlby that a scribe strip has to close, and a floor that falls 12 mm across the span throws the seat line off level enough to read against a skirting board. The frames and the worktop are the easy part. The open question for any given alcove is how much packing and scribing the room itself demands before two rectangular boxes and a plank ever sit true against it.