---
title: "Understairs Bench Cushions, Cut to the Angle of the Stairs"
url: "https://cushionguide.com/concepts/understairs-and-stair-landing-bench-cushions/"
section: "Concept Sketches"
author: "Nate Kowalski, The Pattern Engineer of Detroit"
author_url: "https://cushionguide.com/masters/nate/"
published: "2026-02-18"
updated: "2026-09-24"
keywords: "understairs bench cushion, stair landing bench cushion, angled bench cushion, trapezoid cushion, foyer nook cushion, custom shape cushion drawing, understairs dog bed"
---

# Cushions for understairs benches, stair landings and foyer curves

*Staircases make the oddest seats in the house. Every one of them is still a list of honest measurements, and most get simple the moment the angle is on paper.*

> **The quick answer:** An understairs bench cushion is a trapezoid: three straight edges and one side cut to the angle of the stairs. Measure every edge on its own, take the depth straight out at 90 degrees, and mark which end is angled on a sketch. The angled side always measures longer than the depth. Order it as a custom shape with the drawing, never as a rectangle.

![Blue and mustard madras plaid cushion on a white paneled nook bench beside a bookcase, heron print above](https://cushionguide.com/media/bench-cushions/blue-madras-plaid-reading-nook-bench-cushion-greige-1600.webp "A cool blue plaid gives a quiet greige reading nook some structure, with a heron print and pampas softening the corner.")

## Three plain edges and one that meets the stairs

Most understairs bench cushions go wrong at exactly one edge: the one that meets the stairs. The other three make an ordinary rectangle.

An understairs bench cushion is a [trapezoid cushion](https://cushionguide.com/cushions/trapezoid-cushions/) in work clothes: a straight front, a straight back against the wall, one square end, and one end cut to the rake of the stringer. Angles are just lengths in disguise. Give the maker both long edges, each end corner to corner, and the depth straight out at 90 degrees, and the angle takes care of itself.

Landings and foyers bring their own geometry: a ledge only 6 in (15 cm) deep, a nook that follows a curved railing, a closet floor that runs out to a point. Below are eight real projects from the cutting table. Run your numbers through the [trapezoid cushion calculator](https://cushionguide.com/studio/trapezoid-cushion-calculator/) before you send them. For a plain rectangle on a [mudroom or entryway bench](https://cushionguide.com/cushions/mudroom-and-entryway-bench-cushions/), the [bench cushion builder](https://cushionguide.com/studio/bench-cushion-builder/) is quicker.

So, partner: standing in front of your bench, which end meets the stairs, left or right?

## Eight stair seats, drawn to scale

### 01. An understairs seat angled only where it meets the stairs

![Blue-gray tonal striped box cushion on a cream paneled built-in bench beside white stairs, with ochre and leaf-print pillows](https://cushionguide.com/media/bench-cushions/blue-gray-stripe-alcove-bench-cushion-beside-stairs-1600.webp "A soft blue-gray stripe keeps an all-cream stair-side alcove calm, with two warm pillows at one end.")

A buyer got in touch needing a 57 x 27 in (145 x 69 cm) seat pad for an understairs bench, angled only on the side that meets the stairs. The workshop asked for the bench sizes, then sent beige and cream velvet options. The only open question was which end carried the angle.

**The takeaway:** On the sketch, write which end is angled and how much shorter the back edge is than the front.

> **Tailor's margin:** An understairs bench cushion is a rectangle with one angled end: mark which end, and by how many inches.

### 02. A 34 x 6 in cushion for a narrow staircase ledge

![Pale cream basketweave box cushion with tonal piping on an oak bench on a stair landing beside oak balusters](https://cushionguide.com/media/bench-cushions/pale-cream-weave-bench-cushion-oak-stair-landing-1600.webp "A pale cream cushion on an oak landing bench, next to a matching oak staircase. Tonal piping gives the soft weave a neat edge.")

A buyer wrote in for a 34 x 6 x 4 in (86 x 15 x 10 cm) cushion in black linen with matching piping, for a small staircase ledge. Proportions like that are rare, so the workshop asked before quoting: 34 or 36 in (91 cm), and where would it sit? Later the cushion sat unopened in its vacuum pack for a good while.

**The takeaway:** Open a vacuum-packed cushion the day it arrives; the longer it waits, the longer it takes to recover.

> **Tailor's margin:** A stair ledge cushion 6 in deep and 4 in thick is rare enough that the maker confirms every number.

### 03. A foyer nook that follows a curved stair railing

![Cherry burgundy basket-weave hallway bench cushion with oatmeal piping, stepped around a chimney breast below an oak peg rail](https://cushionguide.com/media/bench-cushions/burgundy-hallway-bench-cushion-chimney-step-1600.webp "One burgundy cushion runs the full length of a hallway bench, getting deeper where the wall steps back.")

A buyer in the US wanted a floor cushion for a foyer nook about 74 x 24 in (188 x 61 cm), one long side curving along the stair railing. A quarter-round corner cushion came up first, but the space was not a corner. The workshop asked for a paper drawing, the two straight dimensions, and a wide photo of the whole foyer before quoting.

**The takeaway:** For a curve, measure the two straight sides and photograph the whole area from far back.

> **Tailor's margin:** A curved foyer cushion starts with two straight measurements and one wide photo, not a guess at the arc.

### 04. A dog bed under the stairs, matched to the dining bench

![Charcoal textured box cushion on an oak bench with low back against terracotta walls, cream bouclé and rust velvet pillows](https://cushionguide.com/media/bench-cushions/charcoal-bench-cushion-oak-terracotta-walls-1600.webp "A charcoal seat cools a terracotta room, while the kilim and brass arc lamp keep it warm.")

A family wrote to the workshop about a corner dining bench with deep French-mattress seats. Under the stairs beside it the dog had a nook, so a 31.5 x 39.4 x 4 in (80 x 100 x 10 cm) dog bed went on the same order, in a linen picked to match the dining chairs.

**The takeaway:** When a pet bed sits beside a bench, order the two together and name the same fabric for both.

> **Tailor's margin:** A 31.5 x 39.4 in dog bed under the stairs looks built in when it shares the dining bench fabric.

### 05. Three straight edges and one angled side, 29 x 53 in

![Oatmeal linen-look bay bench cushion with burgundy piping on oak drawers, rattan tray and mug by a garden window](https://cushionguide.com/media/trapezoid-cushions/oatmeal-linen-bay-bench-cushion-burgundy-piping-1600.webp "The seat angles in at the far corner of the bay and the cushion follows it. Burgundy piping gives a pale fabric a crisp outline against honey oak.")

A buyer in the US sent photos and a drawing of a nook with three straight edges and one angled side. The workshop called it easy: select depth 29 in (74 cm) and length 53 in (135 cm), the longest edge. The buyer kept the standard 4 in (10 cm) thickness, with piping in the same fabric.

**The takeaway:** Enter the longest edge as the length and the deepest point as the depth; the drawing carries the angle.

> **Tailor's margin:** Most understairs cushions have three straight edges and one angled side: order by the longest edge, cut by the drawing.

### 06. A closet floor cushion that ends in a sharp point

![Blue and mustard madras plaid cushion on a white paneled nook bench beside a bookcase, heron print above](https://cushionguide.com/media/bench-cushions/blue-madras-plaid-reading-nook-bench-cushion-greige-1600.webp "A cool blue plaid gives a quiet greige reading nook some structure, with a heron print and pampas softening the corner.")

A buyer got in touch about a floor cushion for a closet nook, square at one end and a sharp triangle at the other: a long side of about 79 in (201 cm), a short side of 59 in (150 cm), 24 in (61 cm) deep. The workshop asked for a top-down drawing with every side measured, and priced it only once the sketch arrived.

**The takeaway:** A top-down sketch with a number on every edge is what turns an odd shape into a quote.

> **Tailor's margin:** A closet floor cushion with one pointed end is quoted from a top-down sketch with a number on every edge.

### 07. A 115 in bench and a thickness note meant for the old cushion

![Long light gray linen-weave bench cushion with steel blue piping along the top and bottom box seams](https://cushionguide.com/media/bench-cushions/long-gray-bench-cushion-steel-blue-piping-1600.webp "The length of this cushion shows how contrast piping draws a clean line along a whole bench.")

From a buyer's sketch in the US, the workshop drew a trapezoid 115 in (292 cm) along the bottom, 82 in (208 cm) along the top and 20 in (51 cm) deep, with angled sides of about 26 in (66 cm). The sketch also said 2 to 3 in thick. That described the old cushion, so the order went ahead at the listed 4 in (10 cm).

**The takeaway:** Write the new thickness on its own line; a number beside an old cushion reads like an order.

> **Tailor's margin:** On a 20 in deep trapezoid bench, each angled side measured about 26 in: always longer than the depth.

### 08. How buyers describe the shape before they draw it

![Four stacked textured bench cushions in charcoal, blue, taupe and cream with cream, self and caramel piping on an oak bench](https://cushionguide.com/media/bench-cushions/four-textured-bench-cushions-piping-options-stack-1600.webp "The same textured fabric with three piping treatments, stacked beside a tape measure.")

The same phrases come back again and again: narrower at the back than the front; one end a rectangle, the other a sharp triangle. Every one describes a trapezoid, and the reply from the cutting table is always the same: a drawing, please, with a number on every edge.

**The takeaway:** If describing your seat takes the words narrower, angled or point, you are ordering a custom shape, not a rectangle.

> **Tailor's margin:** If a bench cushion's front and back differ in length, it is a trapezoid and needs a drawing.

## What each stair shape needs on paper

The [trapezoid measuring Pattern](https://cushionguide.com/guides/trapezoid-cushion-measurements/) walks each edge, and [drawing a custom shape](https://cushionguide.com/guides/custom-shape-cushion-drawing/) shows how to label the sketch. Fabric comes last: [linen or cotton-linen](https://cushionguide.com/fabrics/linen-and-cotton-linen/) for the bench, a [performance weave](https://cushionguide.com/fabrics/performance-and-pet-friendly/) if the dog gets the nook.

| Shape | Measure | Mark on the sketch | Order as |
|---|---|---|---|
| Understairs bench, one angled end | Front, back, square end, angled end, straight depth | Which end is angled, seen from the front | Custom shape with a drawing |
| Stair landing ledge | Length, depth, thickness | Where it sits; confirm any odd proportion | Rectangle, if all four corners are square |
| Foyer nook with a curve | The two straight sides | Which side curves, plus a wide photo | Custom shape with drawing and photo |
| Closet floor with a pointed end | Every edge, plus the depth | The square end and the pointed end | Custom shape with a drawing |
| Long trapezoid bench | Both long edges, both angled sides, depth | Thickness of the new cushion only | Custom shape; ask about two pieces past about 79 in (2 m) |
| Dog bed in the understairs nook | Length, width, thickness | Fabric to match the bench beside it | Rectangle |

## Before the drawing leaves your hands

- ✓ Measure the depth straight out from the wall at 90 degrees. An angled side is always longer than the depth; if yours measures shorter, one of the two numbers is wrong.
- ✓ Measure each angled side on its own, corner to corner. On one bay seat in the US the left side ran 33.75 in (86 cm) and the right 33 in (84 cm).
- ✓ Check that the numbers close: steps plus the short edge must equal the long edge. In an older house, add both diagonals as a check on square.
- ✓ If front and back lengths differ, or there is a notch or a curve, order a custom shape and upload the drawing. If checkout never asks for one, you are on the rectangle route.
- ✓ Approve the maker's scale drawing before anything is cut. Every cushion is measured again after sewing; ask for photos that show the tape.

> **Tailor's margin:** Write space or cushion beside every understairs number. On one 115 in bench, a 2 to 3 in note described the old cushion, not the new one.

> An understairs bench cushion is a trapezoid: three straight edges, one angled side, and that angled side always measures longer than the straight depth.
>
> — Nate

## Stair and nook questions

**A common question:** The cushion I need isn't a rectangle; one end is angled. How do I order it?

**The workshop's answer:** Through the separate custom-shape (trapezoid) option, not the rectangle one. Pick the size range by the longest length and the deepest depth; that only sets the price bracket. At checkout, upload a drawing with a measurement on every edge, plus a photo of the seat if you have one, and put the thickness and fabric code in the personalization box. The cushion is cut to the drawing, not to the totals. A plain paper sketch is fine; if it is hard to read, you will be asked to redraw it larger with each edge labeled.

**A common question:** What exactly should I measure on an angled seat?

**The workshop's answer:** Every edge: the front, the back against the wall, both angled sides and any small clipped corners, plus the depth and the thickness. Take the depth straight from the highest point down to the base line, and measure each angled side separately, corner to corner, instead of repeating one number, because an angled side is not the depth. Mark cut-outs such as a window handle, label the drawing A, B, C, D, and send a photo of the space. Any missing side is asked for before the quote.

**A common question:** One side of our entry nook follows a curved railing. Can you make a cushion for that?

**The workshop's answer:** Yes. Send the shape and measurements before ordering, with a few photos of the room taken from a distance and a sketch if you have one, so everything is agreed first. For a curved space the workshop needs the two straight sides to calculate the curve. It tells you up front whether a customization fee applies, which depends on size, and matching back pillows can be added.

**A common question:** The bench under our stairs is long. Should the cushion be one piece or two?

**The workshop's answer:** For seats of about 98 to 118 in (2.5 to 3 m) and longer, the workshop suggests equal pieces for fit, durability and easier handling: 92 in (234 cm) as two 46 in (117 cm) cushions, for example, and a 197 in (500 cm) nook in three. Each piece is ordered at its own size. It stays your choice; one-piece seats have been made on request, and a photo with measurements gets you advice.

## Questions buyers ask next

### Is an understairs bench cushion a trapezoid?

Usually, yes. Most have three straight edges and one side cut to the angle of the stairs, which makes them a trapezoid in the maker's terms. If the front and back edges differ in length, or there is a notch or a curve, the cushion needs a drawing, not a rectangle order.

### Why does my angled side measure longer than the depth?

Because it runs on a slant. Depth is taken straight out at 90 degrees, so any slanted edge between the same two lines has to be longer. On one 20 in (51 cm) deep bench the angled sides came out near 26 in (66 cm). If your slant measures shorter than the depth, measure again.

### How thick should a stair landing or understairs cushion be?

The projects here ran 4 in (10 cm), the standard thickness, including a 34 x 6 in (86 x 15 cm) ledge cushion. A custom 4.5 in (11 cm) was offered on one angled bench, and thicker builds of 6 to 8 in (15 to 20 cm) are made on request at extra cost.

### Can I see the finished cushion's size before it ships?

Yes. Every cushion is measured after sewing and every order is photographed before it ships. For a custom shape you can ask for photos that show the measurements, which is the easiest way to confirm the angled end came out as drawn.

## Related at the atelier

- [How to draw a custom-shaped cushion so it isn't made mirror-image](https://cushionguide.com/guides/custom-shape-cushion-drawing/): A good custom shape cushion drawing shows the seat from above as you stand in the room, with a letter and a typed measurement on every edge, short returns included, the wall and front edges marked…
- [How to measure a trapezoid cushion so the numbers close](https://cushionguide.com/guides/trapezoid-cushion-measurements/): Trapezoid cushion measurements are the front edge, the back edge and the straight depth taken at 90 degrees, plus both slanted sides as a check.
- [Trapezoid Bench Cushion in Indigo: Contrast Piping in a Bay](https://cushionguide.com/readings/indigo-trapezoid-cushion-kitchen-breakfast-bay/): On a trapezoid bench cushion, contrast piping is worth it when the shape itself is the point.
- [Angled Window Seat Cushion in Sage for a Kids' Reading Nook](https://cushionguide.com/readings/sage-angled-window-seat-cushion-kids-reading-corner/): An angled window seat cushion should be cut to the bay's real angle, not stopped square, so no wedge-shaped gap opens against the side window.
- [Trapezoid Bench Cushion in Gray Tweed with Rust Piping](https://cushionguide.com/readings/gray-tweed-trapezoid-window-seat-cushion-rust-piping/): A trapezoid bench cushion in cool gray stays warm-looking when its piping takes its color from the floor or brickwork, not from the fabric.
- [I ordered my trapezoid cushion on the rectangle listing. What do I do now?](https://cushionguide.com/answers/custom-shape-cushion-wrong-listing/): If a trapezoid cushion went through the rectangle listing, reorder on the custom-shape listing and the workshop cancels the first order with a full refund.
- [Bullnose and waterfall-front cushions, explained by the edge](https://cushionguide.com/guides/bullnose-cushion-rounded-front-edge/)
- [Cushions for lift-up storage benches: where to split and how to hold them](https://cushionguide.com/guides/storage-bench-cushion-hinged-lid/)

*± 1/4 in — Nate*

---

Written by Nate Kowalski (https://cushionguide.com/masters/nate/) 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/concepts/understairs-and-stair-landing-bench-cushions/