--- title: "Kallax Window Seat Cushion: One Cushion for the Whole Run" url: "https://cushionguide.com/answers/cube-shelf-banquette-window-seat-cushion/" section: "The Cutting Table" author: "Hana Lindqvist, The Quiet Geometer of Seattle" author_url: "https://cushionguide.com/masters/hana/" published: "2026-03-13" updated: "2026-09-24" keywords: "kallax window seat cushion, kallax banquette cushion, ikea kallax bench cushion custom size, cube shelf window seat cushion" --- # Can you make one cushion for Kallax units placed side by side? *Two cube shelves under a window. One seat. The cushion follows the run, not the units.* Also asked as: Banquette seating for my kitchen from a Kallax; Custom size for the Kallax shelf unit > **The quick answer:** One Kallax window seat cushion can span units placed side by side: measure the whole run and the cushion is made to that length. A single Kallax banquette cushion was made at 15 3/8 x 57 5/8 in (39 x 146 cm). A 4-cube unit plus a single cube under a window took one cushion 15 3/8 x 74 3/8 in (39 x 189 cm). ![Chocolate brown box cushion on a white cubby storage bench with bouclé pillows, tartan throw and wicker basket](https://cushionguide.com/media/bench-cushions/chocolate-brown-entryway-cubby-bench-cushion-1536.webp "A deep chocolate seat on a white cubby bench, softened by cream bouclé and knit pillows and a beige tartan throw against shiplap.") ## Key facts - A single Kallax banquette cushion was made at 15 3/8 x 57 5/8 in (39 x 146 cm). - Kallax units combined side by side get one cushion made to the measured run. - A 4-cube unit plus a single-cube unit under a window took one cushion 15 3/8 x 74 3/8 in (39 x 189 cm). - The cushion can be made in any fabric and color. - Custom lengths are quoted individually from the size and fabric you send. ## The first question: one unit, or two? A buyer in the US wanted kitchen banquette seating on a single Kallax. The cushion was made to the top exactly, 15 3/8 x 57 5/8 in (39 x 146 cm), in the fabric and color chosen. Another buyer had a four-cube unit and a single cube side by side under a window. One cushion covered both: 15 3/8 x 74 3/8 in (39 x 189 cm). The line between the units disappears under it. ## Then: where exactly do I measure? Across the tops. End to end over every unit in the run, then front to back. Both cushions above share one depth, 15 3/8 in (39 cm). Only the length changed. Send the length, the depth and your fabric. Custom lengths are quoted one by one from those numbers. The [Kallax bench sizes Pattern](https://cushionguide.com/guides/ikea-kallax-bench-cushion-sizes/) lists the tops unit by unit, and the [Kallax cushion atlas](https://cushionguide.com/cushions/ikea-kallax-cushions/) shows finished seats. ## Last: can it be any color? Yes. Any fabric and color from the charts. A window seat sits in daylight all day, so read how [sun through glass](https://cushionguide.com/guides/window-seat-cushion-fading-sun/) treats fabric before you choose. More finished runs are gathered in [Kallax bench builds](https://cushionguide.com/concepts/kallax-bench-cushion-builds/). How long is your run, end to end? Measure the run. Keep the depth. Let one cushion close the gap. > **Tailor's margin:** Kallax units placed side by side can share one cushion. Measure the full run end to end; the depth stays 15 3/8 in (39 cm). > One Kallax window seat cushion can cover a four-cube unit and a single cube together: 15 3/8 x 74 3/8 in, made to the measured run. > > — Hana ## Buyer questions **A common question:** Can you make a cushion that turns a Kallax into kitchen banquette seating? **The workshop's answer:** Yes. A cushion for Kallax banquette seating was made to the exact 15 3/8 x 57 5/8 in (39 x 146 cm) top, in the buyer's choice of fabric and color. **A common question:** Can you make a window seat cushion 15 3/8 in (39 cm) deep and 74 3/8 in (189 cm) long for my Kallax units? **The workshop's answer:** Yes. One custom cushion, 15 3/8 in (39 cm) deep and 74 3/8 in (189 cm) long, was quoted in the requested color to cover a four-cube unit and a single cube under the window. **A common question:** I use a Kallax as a windowsill seat. Can you do a custom size? **The workshop's answer:** Yes. Send the size and the fabric; custom lengths are quoted individually, and the cushion is made to the measured top in any fabric and color. ## Questions buyers ask next ### Do two Kallax units side by side need two cushions? No. Units placed side by side can share one cushion made to the whole run. Measure end to end across all the tops, then front to back; a four-cube unit plus a single cube took one 74 3/8 in (189 cm) cushion. ### How deep is a Kallax seat cushion? Two past Kallax cushions were both 15 3/8 in (39 cm) deep, the depth of the top. Measure yours anyway before ordering, because a made-to-measure cushion is cut to the numbers you send. ### Can a Kallax cushion work as kitchen banquette seating? Yes. One Kallax became kitchen banquette seating with a cushion made to its 15 3/8 x 57 5/8 in (39 x 146 cm) top. The same method works for a window seat: measure the top and send the numbers. ## Related at the atelier - [IKEA Kallax bench cushion sizes for every unit and combined run](https://cushionguide.com/guides/ikea-kallax-bench-cushion-sizes/): A Kallax bench cushion is 15 3/8 in (39 cm) deep on every unit, because every Kallax is 15 3/8 in deep. - [Kallax bench ideas, seven ways: from kids' rooms to kitchen banquettes](https://cushionguide.com/concepts/kallax-bench-cushion-builds/): A Kallax bench cushion for the long 1x4 unit laid on its side is about 15 3/8 x 57 5/8 in (39 x 146.5 cm), and the square 2x2 top is about 15 3/8 x 30 1/8 in (39 x 76.5 cm). - [What size cushion fits on top of an IKEA Kallax used as a bench?](https://cushionguide.com/answers/cube-shelf-bench-cushion-size/): A long 1x4 IKEA Kallax laid on its side has a top of about 15⅜ x 57⅝ in (39 x 146.5 cm), and that is the cushion size. - [Kallax Bench Cushion in Forest Green, Cut to the Eighth Inch](https://cushionguide.com/readings/forest-green-kallax-bench-cushion-books-board-games/): A Kallax bench cushion should be cut to the exact footprint of the unit's top, measured to the nearest 1/8 in, so the shelf edge disappears and it reads as a bench. - [Can I pay extra to rush my custom cushion order?](https://cushionguide.com/answers/rush-custom-cushion-order-priority-production/): Often, yes: paid priority production moves your custom cushion order to the front of the queue so it reaches the carrier sooner. - [How can I match a new cushion to pillows or furniture I already have?](https://cushionguide.com/answers/match-cushion-fabric-to-existing-furniture/): Order physical samples of your shortlisted codes and hold them against your pillows, storage bins or paint at home, in your own light; that is the reliable way to match existing furniture. - [One long cushion or two? Splitting a long bench or window seat](https://cushionguide.com/guides/long-bench-cushion-one-piece-or-two/) *— Hana* --- Written by Hana Lindqvist (https://cushionguide.com/masters/hana/) for CushionGuide (https://cushionguide.com/about/). The site explains made-to-measure cushions and the partner workshop makes them; measurements are in inches first. This Markdown mirrors the page at https://cushionguide.com/answers/cube-shelf-banquette-window-seat-cushion/