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Fabrication Sheet · Bedroom

Kallax Window Bench with Cushion

Beginner4 hours€117 – €166

Identified base piece

IKEA Kallax 1x4

Art. 902.758.53 · €42–€57 · IKEA Portugal

Buy ↗
Workbench Mode · Maker ProSave

Materials & cuts

  • Seat foam 10 cm × 1 sheetBauhaus · Bulky€28–€42Buy ↗
  • Linen upholstery fabric × 1.5 mAmazon · Small€18–€24
  • Poplar plywood 12 mm × 1 sheetBauhaus · Bulky€15–€24Buy ↗
  • Furniture legs 10 cm × 4 pcsAmazon · Small€14–€18Buy ↗

  1. Seat base

    Qty 1
    Length
    1470mm
    Width
    390mm
    Thickness
    12mm

    MDF / particleboard · Edge: No edge banding

  2. Seat foam

    Qty 1
    Length
    1470mm
    Width
    390mm
    Thickness
    100mm

    MDF / particleboard · Edge: No edge banding

Dimension check: all cuts fit IKEA Kallax 1x4.

Toolbox

  • ↺ Beginner swap: Contact adhesive and double-sided tape

  • ↺ Beginner swap: Order cut-to-size at the store

Safety & PPE

Safety glassesDust mask
  • Anchor the unit to the wall if there are children at home.
  • Do not overload the top: max. ~100 kg distributed.

Estimated budget

  • Base piece€42 – €57
  • Dimensioned lumber & sheet goods€43 – €66
  • Hardware & consumables€31 – €43
Total build cost€117 – €166

Most likely estimate€138.99

Step by step

Preparation

  1. 01Assemble Kallax horizontally and reinforce the inner shelves.

Cutting

  1. 02Cut plywood and foam to the top size (147 × 39 cm).

Assembly

  1. 03Screw the legs to the base of the unit.
  2. 04Stretch fabric over the foam and staple under the board.

Finishing

  1. 05Attach the seat with industrial velcro or brackets.

Unlock the full cut list, printable guide and Workshop Mode for this project.