If you’re dealing with a small kids’ room, frequent sleepovers, or siblings sharing a space, a trundle bed might be the smartest furniture investment you make. It’s essentially two beds in the footprint of one, with a second mattress that rolls out from underneath the main bed when needed. But not all trundle beds are created equal, and choosing the wrong one can mean squeaky wheels, awkward mattress hunting, and frustrated kids trying to pull it out. Here’s what to look for.
The first decision is whether you want a standard rolling trundle or a pop-up trundle. Standard trundles roll out on casters and sit close to the floor—they’re simple, affordable (starting around $250 for basic models), and work well for younger kids who don’t mind sleeping low. Pop-up trundles, on the other hand, have a frame that lifts the second mattress to the same height as the main bed, creating what looks like a king-size sleeping surface. These cost more ($500 and up) but they’re much more comfortable for older kids, teens, or adult guests.
Pay attention to the rolling mechanism. Look for trundles with at least four wheels, preferably with some kind of locking mechanism to keep the bed stable once it’s extended. If you have thick carpet, make sure the wheels are large enough to roll smoothly—some budget models have tiny casters that catch on plush rugs.
Most trundle beds are designed for twin mattresses, which makes sense for kids’ rooms. The main bed takes a standard twin (38″ x 75″), while the trundle itself usually requires a thinner mattress—typically 6 to 8 inches thick compared to the standard 10 to 12 inches. This is non-negotiable; a regular-height mattress simply won’t fit under the bed frame.
Before you buy, measure the clearance height under the main bed. Some frames only allow for a 6-inch mattress, while others can accommodate up to 8 inches. This matters more than you’d think—those extra two inches make a real difference in comfort, especially if the trundle will get regular use. Also measure your room to ensure you have space to fully extend the trundle. You’ll need about 38 inches of clearance on the side where it pulls out, plus enough room to walk around it comfortably.
Trundle beds take more abuse than regular beds because kids are constantly pulling them in and out. Solid wood frames (oak, pine, or hardwood) are the most durable but also the priciest, typically ranging from $400 to $1,200 depending on finish and design. Metal frames are sturdy and modern-looking, usually falling in the $300 to $700 range. Engineered wood or composite frames are your budget option at $200 to $400, but check reviews carefully—some hold up fine, while others start wobbling or develop issues with the trundle mechanism after a year or two.
Look at the slat system that supports the mattresses. Both the main bed and the trundle need proper support, and closely-spaced wooden slats (no more than 3 inches apart) work best. Some cheaper models skimp on slats for the trundle, which can cause sagging or damage to the mattress over time.
Trundle beds have come a long way from the strictly utilitarian frames of the past. You’ll find them in styles ranging from minimalist platform designs to cottage-style frames with panel detailing. Daybeds with trundles are particularly versatile—they function as seating during the day and sleeping space at night, making them ideal for rooms that do double-duty as play spaces or guest rooms.
Consider whether you want the trundle to be visible or hidden. Some frames have open bases where you can see the trundle underneath, while others have side panels, drawers, or decorative fronts that conceal it completely. The hidden style looks cleaner when the trundle isn’t in use, but open frames are easier to access and usually cost less.
Color and finish matter too, especially since this bed will likely stay in the room for years. White and natural wood finishes are versatile as your child’s tastes change, while painted colors (navy, gray, sage) can anchor a room’s design but might feel limiting later on.
A trundle bed is one of those purchases that either makes your life easier or becomes a frustrating storage problem that never gets used. Focus on a smooth rolling mechanism, proper mattress fit, and a frame that can handle daily use. When you find the right one, you’ll wonder how you managed sleepovers without it—and you’ll actually have floor space back when guests aren’t over.
Once you’ve settled on a trundle, you might want to explore other bed styles like sleigh beds for different rooms in your home.
Most trundle beds use a standard twin mattress (38″ x 75″), though some accommodate twin XL sizes. The trundle mattress is typically thinner than a standard mattress, ranging from 6 to 8 inches thick to fit under the main bed frame.
Yes, adults can sleep on trundle beds, especially for occasional use during guest visits. Look for models with sturdy pop-up trundles that raise to the same height as the main bed, which provide better support and comfort for adult sleepers.
Modern trundle beds with casters or wheels are quite easy to pull out, even for children. The ease of use depends on the quality of the rolling mechanism and whether you have carpet or hardwood floors, with hardwood typically being smoother.
You need enough floor space to fully extend the trundle, which adds about 38 inches to one side of the bed when pulled out. Make sure there’s clearance between the bed and any walls, dressers, or other furniture to comfortably access the trundle.
Trundle beds require thinner mattresses than standard beds, usually 6 to 8 inches thick, so they can slide under the main bed frame. Most importantly, avoid thick pillow-top or memory foam mattresses that won’t fit in the limited clearance space.
