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Chair Seat Sagging with Broken Springs Underneath

A dining chair that sinks when you sit has broken springs or failed webbing under the cushion. Flip it over, assess what gave way, and decide whether to repair or replace.

Category:Furniture
Difficulty:Moderate
Time:30-45 min
Success:50%
Updated:May 22, 2026

quick_referenceQuick Answer

For Chair Seat Sagging with Broken Springs Underneath, start with "Flip the chair over and remove the dust cover": Turn the chair upside down on a padded surface. The bottom is likely covered with a thin black fabric called cambric or dust cover. Pull the staples with a flathead screwdriver and needle-nose pliers, or carefully cut it away. What you find underneath tells you everything: broken coil springs, snapped twine, stretched rubber webbing, or sinuous springs that have popped off their mounting clips. Stop DIY if the chair frame rails are cracked or splitting where the springs attach — a broken frame makes spring repair pointless. This is listed as a moderate recovery and usually takes about 30-45 min.

verifiedGuide Snapshot

Repair areaFurniture
Estimated time30-45 min
DifficultyModerate
Stop conditions3

Last updated May 22, 2026. Review the stop conditions before continuing.

account_treeRecovery State

DeviceChair
Current stateSeat Sagging
Specific stateBroken Springs Or Webbing
Failed stepChair Seat Support
Likely failure typeWorn Part
DIY boundaryDIY recovery first
paymentsCost decision

help1. Understand the Problem

Chair seats sag when the support structure underneath gives out. On older chairs with coil spring seats, individual springs snap or the twine that ties them together breaks. On modern chairs, it's usually the Pirelli webbing or sinuous springs that have stretched out or pulled free from the frame staples. You sit down, the cushion drops an extra inch, and your knees end up higher than they should be. It's uncomfortable, and over time it'll damage the cushion foam too.

build_circle2. Try This First

Best First Step

Flip the chair over and remove the dust cover

Turn the chair upside down on a padded surface. The bottom is likely covered with a thin black fabric called cambric or dust cover. Pull the staples with a flathead screwdriver and needle-nose pliers, or carefully cut it away. What you find underneath tells you everything: broken coil springs, snapped twine, stretched rubber webbing, or sinuous springs that have popped off their mounting clips.

visibility3. Visual Guidance

See what's happening and how to try the first recovery step.

1
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Replace individual broken coil springsIf one or two coil springs are broken, you can replace just those. Measure the height and diameter of a good spring. Clip the old twine holding the broken spring, work it free, and install a matching replacement. Retie the spring to its neighbors with upholstery twine using a clove hitch knot, then finish with a half hitch. The springs should all sit at the same height when you're done.
2
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Fix sagging elastic webbingIf your chair uses Pirelli webbing (the black rubber strips woven in a grid), stretched webbing is the culprit. Remove the old webbing by pulling the staples at each end. Cut new webbing strips 2 inches shorter than the frame opening between mounting points. Use a webbing stretcher tool or a block of wood as a lever to pull each strip tight, then staple it 3-4 times. The webbing should feel like a drum when you tap it.
3
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Reattach popped sinuous springsSinuous springs are the zigzag wires running across the seat frame, each end hooked into a metal clip. If a spring popped off its clip, use a spring hook tool or needle-nose pliers to stretch the spring back into the clip. If the clip itself has torn out of the wood, relocate it a half inch over with new screws or replace with a press-in clip that doesn't need screws.

autorenew4. If That Doesn't Work

Try the next recovery options.

carpenter
Drop in a plywood seat boardFor chairs that get heavy use and keep breaking springs, skip the springs entirely. Cut a piece of 1/2-inch plywood to fit inside the seat frame, screw it to the frame, and place the cushion on top. It won't have the same give, but it'll never sag again.
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Replace the entire seat assemblyIf three or more springs are broken and the frame is splitting, buy a pre-made replacement seat frame or look for a matching chair at thrift stores to cannibalize for parts.
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Frequently Asked Questions

Can I fix a sagging chair seat without removing the upholstery?expand_more
No, you need access to the springs or webbing from underneath. Flip the chair and remove the dust cover on the bottom. You can do all the spring repair from the underside without touching the top upholstery or cushion.
How much does it cost to re-spring a chair?expand_more
Doing it yourself: $5-15 per coil spring, $3-5 per foot of webbing. A full re-springing by an upholsterer runs $100-250 depending on size and spring type. If the chair has sentimental value, the DIY route saves hundreds.
Can I replace coil springs with webbing?expand_more
You can, but it changes the feel completely. Coil springs give a softer, more traditional sit. Webbing is firmer and more uniform. If you're converting, you'll need to remove all the springs and the twine foundation, then staple webbing across the frame in a woven pattern.

warning5. Stop DIY If

Don't continue if any of these apply.

reportThe chair frame rails are cracked or splitting where the springs attach — a broken frame makes spring repair pointless.
reportMore than half the coil springs are broken or the twine has rotted throughout — this requires a full re-springing by an upholsterer.
reportThe chair is an antique or heirloom with hand-tied springs — these require specialized upholstery skills to maintain value.
Still stuck?Get personalized help with AI Recovery.

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This page provides general DIY guidance.
If you're unsure, it's always best to consult a professional.