How to Fix Sagging Couch Cushions (and Tell If It’s the Frame)

To fix sagging couch cushions, first take the cushions off and work out whether the cushion or the seat underneath is sagging. If the deck under the cushions feels firm and even, rotate, flip, and plump the cushions, wrap a flattened foam core in new batting, or replace a worn-out foam insert. If the deck itself dips, the springs, webbing, or frame is the problem: a support board is only a stopgap, and a broken spring or cracked frame is a job for the warranty or an upholsterer.

Some softening is expected: Ashley’s furniture warranty says all seat cushion cores will soften with normal use and conform to the shape of the user. A cushion that bottoms out, or one spot that drops much lower than the rest, isn’t normal. Most fixes are free or cheap, so find the cause before you buy anything.

First, work out what’s sagging

1. Take the seat cushions off and lay them side by side. If the one from your usual seat is thinner or lumpier than the rest, the cushion is part of the problem.
2. Press the deck with your palm, front to back and end to end. As a rule of thumb, a deck that gives a little, evenly, is fine. A spot that drops much further than its neighbors, a hard edge under the fabric, or a metallic pop points to a broken or loose spring.
3. Open a cushion if it has a zipper. Foam that crumbles, keeps a dent, or squashes flat with little effort has lost its support.
4. Look underneath, with a helper to tip the sofa onto its back on a blanket. Look for broken or unclipped springs, torn or slack webbing, and cracked rails, and keep your hands clear of any reclining or sleeper mechanism.
5. Tighten the legs. An end that sits low, or a sofa that rocks, can be as simple as a loose leg.

What you find	What it usually means	What to do
A sofa only a few months old sits lower than in the store	Normal settling. Furniture Village says foam cushions compress by 10% to 15%, and feather or fiber by 10% to 20%, in the first 3 to 6 months	Rotate and plump, and give it time
Flat or lumpy cushions on a firm, even deck	Flattened fill or softened foam	Rotate, flip, and plump, then add batting or new foam
Cushions that flatten again within a day	Foam that’s lost its support	Replace the insert
A deck that sags like a hammock	Stretched webbing or tired springs	A support board for now, an upholsterer for good
One spot drops, or you feel a hard edge or hear a pop	A broken or detached spring	Check the warranty, then call an upholsterer
One end sits low, or the sofa creaks or rocks	A loose leg or a frame problem	Tighten the legs, then check the frame warranty

Free fixes: rotate, flip, and plump

Most sofas get sat on in the same spots, so those cushions wear first. Moving them around spreads the wear before it becomes a permanent dip.

• Rotate the seat cushions every week. Norwalk Furniture says seat cushions should be rotated once a week to distribute normal wear, and flipped regularly too. Furniture Village suggests swapping the left- and right-hand cushions, plumping each one as you go.
• Flip only reversible cushions. One with its zipper on a face, or different fabric underneath, should just be rotated.
• Plump by hand. Norwalk notes that upholstery often won’t return to its original shape unless the cushions and back pillows are plumped by hand, more so as the furniture ages. Furniture Village’s method: set the cushion on the floor, zipper up, hit one side firmly four times with an open palm, then repeat on all four sides. It recommends plumping feather and fiber cushions daily.
• Work the fill back into place. Ashley suggests unzipping the cover, reaching right down inside, and running your hand along the outside of the insert to fluff the fibers, then zipping it up and smoothing it square.

Check the warranty before you pay for a fix

Furniture warranties often cover the frame, springs, and cushions separately, for very different lengths of time. Ashley’s, for example, gives frames a limited lifetime warranty and cushions one year, and treats normal cushion softening as wear rather than a defect. A cushion that slowly softened over years usually isn’t a claim, but a broken spring or cracked frame may be. Send the retailer or maker photos of the deck, the underside, and the law tag before you cut or replace anything, and ask whether repairing it yourself would affect a claim.

Firm up a flat cushion

Add a new batting wrap

Many foam seat cushions have a thin wrap of polyester fiber around the core, which gives them their full, rounded look. As a rule of thumb, that wrap flattens before the foam does, and replacing it is the cheapest way to make a cushion fuller.

1. Ease the insert out of its cover and peel off the old wrap if it’s matted or torn.
2. Wrap the core in new polyester upholstery batting, covering the top, bottom, and front edge, trimmed so it doesn’t bunch at the corners. Add a second layer if it still looks flat.
3. Slide the core back in, front edge first, and plump it into the corners.

Down, feather, and fiber cushions just need frequent plumping. If the casing is torn or the fill has thinned, an upholsterer can refill it.

Replace a worn-out foam insert

If a cushion still bottoms out after a new wrap, the foam needs replacing. The Polyurethane Foam Association (PFA), the foam industry’s trade group, explains the two numbers that matter:

• Density, in pounds per cubic foot, is about how long it lasts. PFA says density affects durability and support, and that typically, the higher the density, the better foam retains its original properties.
• IFD is about how firm it feels. It’s the force, in pounds, needed to compress the foam by 25%: the more force, the firmer the foam, from about 5 lb (supersoft) to about 80 lb (very firm). Sellers often list it as ILD.
• They’re independent. PFA notes that a high-density foam can be soft and a low-density foam can be firm. A firm, low-density foam can feel right on day one and still sag sooner.

To order one, measure the cover, not the old foam, which has compressed, and note any T-shape or angled sides. Ask the maker for the original spec if you liked how the sofa felt new. Otherwise, as a rule of thumb, choose a density at least as high as the original and pick the firmness by feel. Wrap the new foam in batting before it goes in, and expect it to ease a little: PFA’s durability tests measure how much firmness foam loses through initial use, and Furniture Village says foam cushions compress by 10% to 15% in their first 3 to 6 months.

Buying criteria

Choosing replacement cushion foam

• Density (lb per cubic ft) and firmness (IFD or ILD) both listed, so you can match or beat the original
• Cut to your cover’s width, depth, and thickness, including T-shapes
• A batting wrap included, or batting you add before it goes in the cover

• Listings that give firmness but not density
• Sizes taken from the old, compressed foam instead of the cover

We haven’t verified specific products here yet, so we list criteria instead of guessing.

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Shore up a sagging seat deck

If the cushions are fine but the deck sags, the springs have lost their shape or the webbing has stretched. A lasting fix means re-tying or replacing springs or re-webbing the seat, which is upholstery work.

As a stopgap, a rigid support panel under the seat cushions spreads your weight across the deck, so you stop sinking into its weakest spot. Measure the deck between the arms and from back to front, and use a panel that fits inside it without hanging over the front edge: a ready-made folding sofa support board, or plywood cut to size with its edges sanded or padded so they don’t wear the deck fabric. Expect the seat to feel a little higher and firmer.

As a rule of thumb, a board works best on a deck that sags evenly. It won’t fix a broken spring, torn webbing, or a cracked frame, and hiding one of those under a board only delays the repair.

Buying criteria

Choosing sofa cushion support boards

• Sized to fit inside the deck without hanging over the front edge
• Folding or sectional panels you can match to your seat width
• Smooth or padded edges that won’t wear the deck fabric

• Using a board to cover a broken spring or a cracked frame
• Panels so thick they raise the seat uncomfortably

We haven’t verified specific products here yet, so we list criteria instead of guessing.

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When to call an upholsterer or the maker

• A spring is broken or loose, or you can feel a sharp end through the fabric.
• Webbing is torn or sagging away from the frame, or the frame creaks, cracks, or shifts when you sit.
• The sofa is still under warranty. Report it before you repair anything.
• A down or feather cushion’s casing is torn, or the fill has thinned.

An upholsterer can re-tie or replace springs, re-web a seat, cut foam to fit your covers, and refill down cushions. Compare the quote with the cost of a new sofa; a sturdy frame is often worth keeping.

If the cushions slide as well as sag

Cushions often slide because they’ve worn unevenly or the seat tilts slightly forward, and a sagging deck can do both. Fix the sag first. If they still creep, a thin, non-adhesive grip liner between each cushion and the deck usually holds them. See how to stop leather couch cushions sliding for what to test first on leather.

Mistakes to avoid

• Replacing foam in the first few months. Furniture Village says to expect settling in the first 3 to 6 months.
• Buying foam on firmness alone. Firmness and density are separate, and PFA ties density to how well foam keeps its original properties.
• Rotating only the cushion you sit on. Move them all, so they wear evenly.
• Hiding a broken spring under a board. A board is for an evenly tired deck, not a broken part.
• Opening up a sofa that’s under warranty before you’ve asked the maker.

Other furniture fixes

If the whole sofa creeps across the floor, see how to stop a couch sliding on hardwood. For sectional pieces drifting apart, see how to keep a sectional from separating, and if a cat is wearing out the arms, try how to stop a cat scratching the couch. You’ll find more sofa fixes on the furniture hub.