How to level furniture with plastic wedges
Updated: 23 October 2026
A table that taps the floor at one corner, a chair that knocks when you sit, or a cabinet that rocks when you close a door is often a sound piece on an uneven floor. How to level furniture with plastic wedges starts with that distinction. Pack the floor only after the furniture itself is tight, and stop when the job is an appliance foot, a soil pipe, or glass. The [Plastic wedges](/hub/diy-supplies/plastic-wedges) comparison is where the packs are ranked. Public UK guides and the amazon.co.uk reviews in this set were checked on 21 October 2026. A qualifying purchase can earn a commission at no extra cost to you.
A table that taps the floor at one corner, a chair that knocks when you sit, or a cabinet that rocks when you close a door is often a sound piece on an uneven floor.
A table that taps the floor at one corner, a chair that knocks when you sit, or a cabinet that rocks when you close a door is often a sound piece on an uneven floor. How to level furniture with plastic wedges starts with that distinction. Pack the floor only after the furniture itself is tight, and stop when the job is an appliance foot, a soil pipe, or glass. The Plastic wedges comparison is where the packs are ranked. Public UK guides and the amazon.co.uk reviews in this set were checked on 21 October 2026. A qualifying purchase can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Stated size | Surface in reviews | Stack notes | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  HongNuoEn HongNuoEn 50 mixed plastic wedges | 6 mm and 8 mm pieces | Decking in one review | Cut claimed; no stack bullet | 7.5 | about £6.99 | View offer |
 n/a 10 black furniture wedges, stated 6 mm | 30 × 50 × 6 mm | Table, wardrobe, washer | UK reviews stack them | 7.8 | about £4.59 | View offer | |
| Alternative |  CRCFSUK CRCFSUK 4 clear wedges, 10 mm | 48 × 30 × 10 mm | Hard floor; carpet failed | Two used together for height | 6.7 | about £4.19 | View offer |
On this page
Check the leg before the floor
A loose bolt or an open joint will tap even on a flat floor. A short leg on a sound chair taps because the floor is out. Saxton Blades' UK guide says to tighten screws or bolts before any wedge. A plastic taper fills a gap. It does not clamp a joint back together.
If a leg is split, repair that first. Glue is that site's tip, not a requirement of these packs. When the joints are tight, find the corner that lifts. Pack choice sits on the plastic wedges buying guide.
Find the corner that lifts
Press each corner in turn. The short leg drops, and the opposite corner often lifts. Measure that lift in millimetres. Wedges under all four feet at random usually start a new rock.
On a hard floor the gap is often only a few millimetres. If a feeler says 3 mm, push a short wedge in only part of the way. If it says 12 mm, one 6 mm piece will not finish the job. Use one wedge under the short leg, thin end first. Which pack scores as the top pick is on the best plastic wedges page.
Slide, stack, and look again
Push the thin end under the short foot until the rock disappears, then press the other corners again. Stop when a new corner lifts. UK reviews on B0DMNL71PB describe a stack under a wardrobe. A review on B0GKNQ26TH says two together were used for height. Neither is a tested limit, and the files give no push-force.
On carpet those clear wedges were ineffective, because the pile lets the taper sink. Do not keep stacking into a soft carpet. Do not leave a taper where a bare foot will catch it.
Where a furniture wedge is the wrong first step
A washing machine that shakes is a foot-and-lock-nut job first. Beko tells you to empty the machine, tilt it with a second person, adjust the feet, and tighten the lock nuts. Samsung UK and Bosch UK give the same order. LG says not to insert wood under the feet. One UK review on B0DMNL71PB put wedges under an integrated machine. That is a user report. If a small gap remains, re-test on a spin.
The UK Plumbers Forum accepts plastic shims under a pan only if the soil joint is sound, held with silicone. If the joint leaks, or the pan is cracked, call a plumber. Do not cover a glazing drain. Call a joiner when the leg is broken, the cabinet is racking, or the floor has failed.
Common questions
Do you tighten the leg before you add a wedge?
Yes. Tighten screws and bolts, and look for a cracked leg or an open joint, before you pack the floor. A wedge fills a gap under a sound foot. It does not pull a loose rail back together. Saxton Blades' UK table guide uses that order, and it fits these packs. If the piece still rocks after the fixings are tight, then you measure the corner that lifts.
How do you find the leg that is short?
Press each corner in turn. The short leg drops, and another corner often rises. Measure that lift in millimetres rather than guessing from the rock. Put one wedge under the short foot, thin end first. Four wedges placed at random usually create a second rock. On a hard floor the gap is often only a few millimetres, which is the range a stated 6 mm furniture wedge is sold for.
Can you stack two wedges?
You can add a second piece while the furniture still rocks, then press the corners again and stop when a new corner lifts. UK reviews in this set mention a stack under a wardrobe and two pieces used together for height. Those are user reports, not a tested limit. There is no stack height and no push-force in the files. If the gap is far beyond the thick end, measure it and reconsider the pack rather than building a tall, loose pile.
What if the wedge slips on carpet?
A UK review on B0GKNQ26TH found clear wedges ineffective on carpet. The pile lets the taper sink or creep, so the rock returns when you sit. Ridges that held on a hard floor, including under a tight door in another comment, do not grip a soft carpet in the same way. Try a firmer contact under the foot, and do not keep adding smooth pieces into the pile. If the furniture is damaged rather than short, go back to the joint.
Should a washing machine get a wedge or a foot adjustment?
Adjust the feet and tighten the lock nuts first. Beko, Samsung, and Bosch UK guides all start that way: empty the drum, tilt with a second person, then set the feet. LG says not to insert wood under the feet. One UK review in this set put wedges under an integrated machine. Treat that as one user's report. It is not approval to skip the feet. Only if a small gap remains after the lock nuts are tight should you consider a wedge, and then re-check on a spin.
Should you glue the wedge to the leg?
These listings do not require glue. Saxton Blades suggests glue as that site's own tip for a wobbly table. Leave the wedge dry so you can pull it if the floor moves or you need to reset the stack. Glue also makes a trip hazard harder to remove if the taper still sticks out. On a hard floor, push the thin end in until the rock stops and the piece sits fully under the foot.
Related pages
Sources
Public UK sources and the amazon.co.uk listings compared on this page. Listings captured 21 October 2026. Updated 23 October 2026.
- GGF installation guide, section 3.12 (retrieved 21 October 2026)
- BS 8213-4:2016 windows and doorsets (retrieved 21 October 2026)
- BS 6262:1982 glazing code (retrieved 21 October 2026)
- General Product Safety Regulations 2005 (retrieved 21 October 2026)
- Consumer Rights Act 2015, section 11 (retrieved 21 October 2026)
- Fix Direct: how glazing packers are used (retrieved 21 October 2026)
- Homebuilding: stop fence panels rattling (retrieved 21 October 2026)
- Beko UK: how to level a washing machine (retrieved 21 October 2026)