---
title: "Extra Thick Seat Cushion: How Thick Can a Custom Cushion Go?"
url: "https://cushionguide.com/answers/extra-thick-cushion-maximum-thickness/"
section: "The Cutting Table"
author: "Nate Kowalski, The Pattern Engineer of Detroit"
author_url: "https://cushionguide.com/masters/nate/"
published: "2026-06-25"
updated: "2026-06-25"
keywords: "extra thick seat cushion, thick bench cushion 8 inch, 9¾ in (25 cm) thick cushion, maximum cushion thickness, thick window seat cushion"
---

# What's the thickest cushion you can make? Can I get 6¼ or 9¾ in (16 or 25 cm)?

*The dropdown ends at 5 or 6 in. The foam doesn't. Here's the thread, one follow-up at a time, partner.*

Also asked as: Is 4 inches your thickest option?; What's the thickest you provide?

> **The quick answer:** The thickest custom seat cushion the workshop states is about 15.7 in (40 cm), even though the standard menu tops out at about 5-6 in (12.5-15 cm). Cushions 5, 6 and 8 in thick are routine. For about 10 in (25 cm), add two 5 in (12.5 cm) cushions to the cart and note that you want one 9¾ in (25 cm) piece, or ask for a custom link.

![Aubergine velvet seat and back cushions on a dark corner banquette with a marble bistro table and brass sconces](https://cushionguide.com/media/banquette-cushions/aubergine-velvet-banquette-seat-back-cushion-bistro-1600.webp "Aubergine velvet seat and back cushions turn a dark wood banquette into a bistro corner at home.")

## Key facts

- The thickest standard menu option is about 5-6 in (12.5-15 cm), depending on the listing.
- 5 in, 6 in (15 cm) and 8 in (about 20 cm) cushions are routine.
- The stated maximum thickness is about 15.7 in (40 cm).
- For 10 in (25 cm), order two 5 in (12.5 cm) cushions and note one 9¾ in (25 cm) piece.
- Custom order links are available for extra-thick cushions.
- About 6 in (15 cm) already gives a deep, sofa-like feel.

## “Is 4 inches your thickest option?”

No. Four inches is where many menus stop, not where the foam stops. Thickness is fully customizable: 5 in, 6 in (15 cm) and 8 in (about 20 cm) are routine builds, and the stated ceiling is about 15.7 in (40 cm).

The standard metric menu tops out at 5 in (12.5 cm) on some listings and 6 in (15 cm) on others. Past that, you're in custom territory. That's a different form to fill in, not a no.

## “Fine. How do I get 9¾ in (25 cm) in one piece?”

1. **Add two 5 in (12.5 cm) cushions to the cart**: Same length and depth, each at the 5 in (12.5 cm) thickness. Two 5 in (12.5 cm) prices cover one 10 in (25 cm) cushion.
2. **Write the instruction in personalization**: Say it plainly: one cushion, 9¾ in (25 cm) thick, not two cushions. Repeat the exact length and depth.
3. **Or ask for a custom link**: If the cart arithmetic feels odd, ask the workshop for a custom order link at your exact thickness.

## “My old cushion was 6¼ in (16 cm). Do I need a custom build?”

Look hard at the 6 in (15 cm) option first. It's ½ in (1 cm) thinner than 6¼ in (16 cm), about 3/8 in, and it still gives a deep, sofa-like seat. Tolerance is kindness to your future self.

Whatever you pick, thickness moves your seat height and your knee clearance under the table. Run the numbers in the [seat height calculator](https://cushionguide.com/studio/seat-height-calculator/) and check the [banquette thickness Pattern](https://cushionguide.com/guides/banquette-cushion-thickness-table-height/) before a thick [banquette cushion](https://cushionguide.com/cushions/banquette-cushions/) lifts everyone's elbows above the tabletop.

## “Should the back be as thick as the seat?”

Usually not. Write each cushion's thickness in personalization, say a 4 in seat with a 2 or 3 in back. Keep a foam backrest at 2 in (5 cm) or more; thinner foam flattens against the back.

One more data point: 2, 3, 4 and 5 in cushions all use the same firm 32-density foam, so 4 and 5 in feel alike and the difference is mostly the look. The [foam firmness finder](https://cushionguide.com/studio/foam-firmness-finder/) helps if feel matters more than height. What does your seat measure from floor to cushion top today?

> **Tailor's margin:** A 10 in (25 cm) seat cushion is ordered as two 5 in (12.5 cm) cushions in the cart, with a note asking for one piece.

> Custom seat cushions go as thick as about 15.7 in (40 cm); 5, 6 and 8 in builds are routine, whatever the dropdown says.
>
> — Nate

## Buyer questions

**A common question:** Is 4 in the thickest you make, or can I get 5, 6 or 8 in?

**The workshop's answer:** Thickness is fully customizable. The shop has made 5 in, 6 in (15 cm) and 8 in (about 20 cm) cushions and says it can go up to about 15.7 in (40 cm).

**A common question:** Can you make an extra-thick window bench cushion, around 6¼ in (16 cm)?

**The workshop's answer:** The thickest standard option is about 6 in (15 cm). That's only ½ in (1 cm) less than 6¼ in (16 cm) and still gives a deep, sofa-like feel.

**A common question:** Can you make a cushion 9¾ in (25 cm) thick?

**The workshop's answer:** Yes. Add two 5 in (12.5 cm) thickness cushions to the cart and write in personalization that you want one 9¾ in (25 cm) cushion, or ask for a custom order link.

**A common question:** And the other end: what's the thinnest cushion you make?

**The workshop's answer:** 2 in (5 cm) is the thinnest standard option and the recommended minimum for seating. Thinner pads can be custom made: piping works down to about 1.2 in (3 cm), and 1 in (2 cm) pads are made without piping.

## Questions buyers ask next

### Does a thicker cushion feel softer?

Not necessarily. The 2, 3, 4 and 5 in cushions all use the same firm 32-density foam, so 4 and 5 in feel alike. Extra thickness changes the look and the seat height more than the firmness.

### Will an extra-thick cushion change my seat height?

Yes, roughly inch for inch. Every inch of cushion raises the seat top by about an inch, so check the finished height against your table, window sill or knees before ordering; the seat height calculator does the arithmetic.

### Is an 8 in cushion a special request?

It's routine. An 8 in (about 20 cm) cushion is no problem, but it sits past the standard menu, so it goes through a custom link or the two-cushion cart method with a clear note in personalization.

## Related at the atelier

- [Does a thicker cushion cost more, and is a thinner one cheaper?](https://cushionguide.com/answers/does-thicker-cushion-cost-more/): Within the standard range, a thicker cushion costs the same: 2, 3, 4 and 5 in (5 to 13 cm) are one price, so thinner is not cheaper.
- [Is a 3 or 4 inch cushion thick enough on a hard wooden bench?](https://cushionguide.com/answers/cushion-thickness-for-hard-wood-bench/): Yes, a 3 inch (7.5 cm) cushion is thick enough over a plywood kitchen nook bench, and 4 in (10 cm) is the recommendation for sitting and napping on a hard wooden or wicker base.
- [Can you make any curved shape, or are some too hard to make?](https://cushionguide.com/answers/curved-cushion-shapes-declined-limits/): Yes, curved cushions can be made when the curve is mild, but only after the craftsmen review a measured drawing and photos.
- [Making a paper template a cushion workshop can actually use](https://cushionguide.com/guides/paper-template-for-custom-cushion/): A cushion template is a full-size paper tracing of the seat, marked top side up, with the wall edge, two measured reference lines and every edge length written on it.
- [Banquette Cushion Lessons from a Charcoal Café Window Seat](https://cushionguide.com/readings/charcoal-banquette-cushion-japandi-cafe-window/): A long banquette cushion works best in two or more lengths, so each piece lifts out and the joint falls where nobody sits.
- [Pinstripe Banquette Cushion: Mixing Stripes, Plains and Texture](https://cushionguide.com/readings/multicolour-pinstripe-banquette-cushion-dining-nook/): A striped banquette cushion mixes well with other patterns when at least two of its stripe colors already appear in the room and every other seat stays plain.
- [Banquette cushion thickness: getting table height and knee room right](https://cushionguide.com/guides/banquette-cushion-thickness-table-height/)

*± 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/answers/extra-thick-cushion-maximum-thickness/