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Under-Bed Trundle for Bed or Storage

A rolling plywood platform that lives under a bed — a pull-out second mattress or a giant drawer, on six casters so the middle never sags.

Cut list

Part	Qty	T × W × L	Material	✓
Bottom platform Cut to your under-bed footprint — width = C, length = bed length minus ~1-1/2". Example shown.	1	3/4" × 38 1/2" × 70 1/2"	3/4" plywood	☐
Long sides 1x10 (9.25" wide) if you have more clearance.	2	3/4" × 7 1/4" × 70 1/2"	1x8	☐
End sides	2	3/4" × 7 1/4" × 38 1/2"	1x8	☐

Item	Qty	✓
3/4" plywood or MDF, 4x8 sheet The bottom platform.	1 each	☐
1x8 or 1x10 board, 8 ft (Pine) Sides — 1x8 for 8" clearance, 1x10 if you have more room.	3 each	☐
Caster wheels, 2-1/2"+ overall Four corners plus two in the center to stop the middle sagging.	6 each	☐
Wood screws, 2"	40 each	☐
Wood glue	4 oz	☐
Wood putty	4 oz	☐
Finish	12 oz	☐

Overall cost: $$. Lumber varies by region, species, and season, so we give a band rather than a figure.