Replacement Cushion Foam for Popular Sofas: Pottery Barn, IKEA, West Elm & More
You bought a sofa from a brand you trusted. It looked beautiful in the showroom. The cushions felt supportive. But after a few years of daily use, the foam has gone flat and the cushions sag like hammocks. Now you are searching for your specific sofa model trying to figure out how to fix it.
Here is the pattern: nearly every major furniture brand ships sofas with foam that is significantly lower quality than what is available aftermarket. Brands that charge $1,500 to $5,000 for a sofa routinely use 1.5 to 2.0 lb/ft³ foam that degrades within three to five years. When you replace that factory foam with 2.8 lb/ft³ high-resiliency foam, you end up with a sofa that feels better than it did on day one — because you are using better material than the manufacturer did.
This guide covers the most popular sofa brands in America, what foam they use, and exactly how to replace it with a professional-grade upgrade.
The Universal Truth About Furniture Brand Foam
Before we dive into specific brands, understand this: the foam inside your sofa is one of the biggest margin items for furniture manufacturers. A sofa that retails for $2,500 might contain $40 to $80 worth of foam. Using premium 2.8 lb foam instead of budget 1.5 lb foam would add $60 to $120 to the manufacturing cost — which the manufacturer avoids to protect margins.
This is not a criticism of these brands. Their sofas have quality frames, good construction, and attractive design. But foam is where they cut corners, and it is why even expensive sofas sag within a few years.
The good news: this is the one component you can upgrade yourself for a fraction of what a new sofa costs. For the full cost breakdown, see our sofa cushion foam replacement cost guide.
Pottery Barn
What Pottery Barn Uses
Pottery Barn sofas typically use 1.8 to 2.0 lb/ft³ high-density polyurethane foam for seat cushions, often wrapped in a polyester fiber layer or a combination of foam and down blend depending on the model. Their most popular lines — the York, Buchanan, Cameron, and Big Sur — all use variations of this spec.
The down-blend models (like the Turner and some Pearce configurations) use a foam core surrounded by a feather-down envelope. In these cases, the foam core still degrades over time and is the primary cause of sagging.
How to Upgrade
Replace the foam core with 2.8 lb HR foam from our configurator. For down-blend cushions, you can reuse the existing down envelope if it is still in good condition — simply insert the new foam core and place it back inside the down wrap before putting it in the cover.
Measuring tip: Pottery Barn cushions tend to use standard shapes. Most are rectangular or T-shaped. Remove the cover, measure seam-to-seam following our measuring guide, and add half an inch to width and depth.
Typical Cushion Dimensions
| Pottery Barn Model | Approximate Seat Cushion Size | Shape |
|---|---|---|
| York Slope Arm | 24 × 24 × 5 inches | Rectangle |
| Buchanan | 25 × 23 × 5 inches | Rectangle |
| Cameron | 24 × 22 × 5 inches | T-shape |
| Turner (leather) | 26 × 24 × 5 inches | Rectangle |
| Big Sur | 27 × 25 × 6 inches | Rectangle |
Dimensions are approximate — always measure your specific covers.
IKEA
What IKEA Uses
IKEA is transparent about foam specs in their product documentation, and the numbers confirm what you suspect: most IKEA sofas use 1.5 to 1.8 lb/ft³ foam. Popular models like the Ektorp, Kivik, Friheten, and Landskrona ship with foam that feels comfortable in the store but compresses noticeably within the first year of regular use.
IKEA cushion covers are designed to be removable and washable, which makes foam replacement particularly straightforward.
How to Upgrade
IKEA cushions are some of the easiest to replace because the covers are designed for removal. Simply unzip, remove old foam, insert new 2.8 lb HR foam, and zip closed.
IKEA-specific tip: IKEA cushion covers are manufactured to tight tolerances in standardized dimensions. This means your cover measurements will be very precise. Measure seam-to-seam and add the standard half-inch buffer for a perfect fit.
Typical Cushion Dimensions
| IKEA Model | Approximate Seat Cushion Size | Shape |
|---|---|---|
| Ektorp (3-seat) | 22 × 22 × 5 inches | Rectangle |
| Kivik (3-seat) | 28 × 22 × 5 inches | Rectangle |
| Landskrona | 22 × 24 × 5 inches | Rectangle |
| Friheten (sleeper) | 24 × 22 × 4 inches | Rectangle |
| Söderhamn | 26 × 38 × 5 inches | Rectangle (deep seat) |
West Elm
What West Elm Uses
West Elm positions itself as a modern, design-forward brand and charges premium prices — yet their foam specs are middling. Most West Elm sofas use 1.8 to 2.0 lb/ft³ foam. Models like the Harmony, Haven, and Andes are frequent subjects of customer complaints about premature sagging, particularly the deeper-seated models where the foam covers a large surface area.
How to Upgrade
West Elm cushion construction is typically straightforward — zippered covers over foam inserts, sometimes with Dacron batting. Remove the cover, measure, and order replacement foam.
For the deep-seat models like the Harmony (which has seat depths exceeding 24 inches), medium-firm HR foam is critical. Deeper seats put more leverage on the foam, and low-density material fails faster in this configuration. The 2.8 lb HR foam from our custom sofa cushions page handles deep-seat applications without issue.
Typical Cushion Dimensions
| West Elm Model | Approximate Seat Cushion Size | Shape |
|---|---|---|
| Harmony | 28 × 24 × 5 inches (deep seat) | Rectangle |
| Haven | 26 × 22 × 5 inches | Rectangle |
| Andes | 24 × 22 × 5 inches | Rectangle |
| Hamilton | 24 × 24 × 5 inches | T-shape |
| Shelter | 24 × 20 × 5 inches | Rectangle |
Restoration Hardware (RH)
What RH Uses
Restoration Hardware sells some of the most expensive sofas on the market — $3,000 to $10,000+ — and their foam is better than budget brands but still not professional grade. RH typically uses 2.0 to 2.2 lb/ft³ foam in their seat cushions, often in combination with down-blend wraps for their signature cloud-like feel (particularly in the Cloud and Maxwell lines).
The irony is acute: a $6,000 RH Cloud sofa uses foam that costs the manufacturer under $100 and degrades within four to six years.
How to Upgrade
RH cushions, particularly the down-blend models, have a specific construction: a foam core inserted into a down or feather-down envelope, then placed inside the outer fabric cover. When replacing foam, you work with the inner foam core only.
Remove the outer cover, then remove the foam core from the down envelope. Measure the foam core's dimensions (or better, measure the down envelope's interior — the foam core may have already compressed from its original size). Order replacement foam to match the down envelope's interior dimensions.
RH models tend to use thicker cushions (5 to 7 inches) and generous dimensions. Budget accordingly — larger cushions cost more, but the per-cushion investment is still a fraction of a new RH sofa.
La-Z-Boy
What La-Z-Boy Uses
La-Z-Boy uses a range of foam qualities depending on the model tier. Their entry-level pieces use standard 1.5 to 1.8 lb/ft³ HD foam. Their mid-range and premium lines use 1.8 to 2.0 lb/ft³ foam, sometimes with a softer comfort layer on top of a firmer base.
La-Z-Boy recliners present a unique challenge: the seat cushion, footrest pad, and sometimes the back cushion are separate foam pieces within the same chair. You can replace individual sections.
How to Upgrade
La-Z-Boy recliner seat cushions are typically accessed from the bottom. Flip the chair over (in the closed position), and you will find either a fabric panel secured with staples or a zipper access point. Remove the old foam, measure the cavity or the old foam's uncompressed dimensions (if not too degraded), and order replacement foam.
For La-Z-Boy sofas (non-reclining), the process is identical to any other sofa — unzip covers, measure, order, and install.
La-Z-Boy tip: Medium-firm to firm HR foam works best in recliners because the seat bears your full body weight in the reclined position. Soft foam in a recliner creates a bowl shape that is difficult to get out of.
Crate & Barrel
What Crate & Barrel Uses
Crate & Barrel uses 1.8 to 2.2 lb/ft³ foam across their sofa lines. Models like the Lounge, Axis, and Gather use standard foam-plus-fiber construction. Their polyester fiber wrap creates a pleasant initial softness, but the underlying foam still determines long-term support and shape retention.
How to Upgrade
Standard zippered cover construction. Remove, measure, replace. If the existing Dacron or fiber wrap is still fluffy and intact, reuse it by wrapping it around the new foam with spray adhesive. If the wrap has flattened, replace it along with the foam.
Article, Burrow, and Other DTC Brands
What DTC Brands Use
Direct-to-consumer sofa brands that sell online (Article, Burrow, Joybird, Albany Park, Inside Weather) typically use 1.8 to 2.2 lb/ft³ foam. Some brands market their foam density prominently, while others are vague. The DTC model compresses margins further, which means foam quality is often the first casualty.
How to Upgrade
DTC sofas are uniformly easy to replace foam in — they are designed for modular shipping, which means cushions are removable by design. Measure and order through our configurator like any other sofa.
The Universal Replacement Process
Regardless of which brand you own, the foam replacement process is the same:
- Remove the cushion cover (unzip or open the seam).
- Measure the cover from seam to seam — not the old foam. Follow our detailed measuring guide.
- Order 2.8 lb HR foam from our configurator in the correct shape and dimensions.
- Install the new foam — fold it to insert, position in corners, zip closed.
- Enjoy a sofa that feels better than the day you bought it.
For the complete step-by-step walkthrough with pro tips for every stage, see our couch cushion foam replacement guide.
Frequently Asked Questions
Will aftermarket foam fit my branded sofa exactly?
Yes. Custom-cut foam is made to your exact measurements, not to brand-specific templates. Regardless of which brand made your sofa, if you measure the cushion cover correctly, the replacement foam will fit. We cut to quarter-inch precision.
Should I replace all cushions at once?
We strongly recommend it. Mixing new firm foam with old compressed foam creates an uneven seating surface that feels awkward and looks lopsided. Replacing all seat cushions simultaneously ensures uniform comfort and appearance.
What about sofas with attached cushions?
Some brands (particularly older model years) have cushions sewn to the frame without zipper access. A local upholsterer can open a seam, insert new foam, and re-stitch it for $20 to $40 per cushion. See our FAQ page for more guidance.
Can I use your foam as a mattress replacement for a sofa bed?
Yes. For sofa bed mattresses (pull-out sleepers), order a single foam slab to match the bed dimensions. Four to five inches of 2.8 lb HR foam makes a significantly more comfortable sleeping surface than the thin, stiff mattress that came with the sofa bed.
My sofa is from a brand not listed here. Can I still replace the foam?
Absolutely. The brand does not matter — the process is universal. Measure your cover, choose your foam, and order. If you have questions about your specific sofa, contact us and we are happy to help.
The Bottom Line
Every major sofa brand — from budget to luxury — uses foam that is lower quality than what you can order yourself. A $100 to $250 foam replacement gives you professional-grade 2.8 lb HR foam in a sofa that shipped with 1.5 to 2.0 lb material. Your sofa's frame, fabric, and design are worth keeping. The foam just needs an upgrade.
Ready to bring your sofa back to life? Build your custom cushion foam →
Explore our custom sofa cushion options for more details, or visit our How It Works page to see the full process from measuring to delivery.
