What Is a Trundle Bed?

Ever found yourself scrambling for an extra bed when your child suddenly announces they’re having a sleepover - or when their friends decide to stay the night? You’re not alone. Many parents across the UK face the same space dilemma: how to comfortably accommodate extra sleepers without dedicating an entire room or bulky furniture to it.

That’s where a trundle bed might come in. At Wowcher, we know how important it is to find practical solutions that work for busy households. In this blog, we’ll walk you through exactly what a trundle bed is, the different sizes and styles available and the real pros and cons. Read on to discover all about trundle beds.

What Is a Trundle Bed?

A trundle bed is a smart, space-saving solution that consists of two beds in one. It looks like a standard single or day bed, but concealed beneath is a second mattress on a low platform with wheels. This second bed can be rolled out whenever you need an extra sleeping spot, then tucked neatly away when you're done. It's particularly popular in UK homes where space is tight but occasional guests, sleepovers or shared bedrooms are common.

Design and Structure

Trundle beds are typically built with a solid wooden or metal main frame that resembles a single bed or day bed. Underneath, the trundle section is housed in a slightly smaller frame that slides in and out on castor wheels or gliders. Some models are simple pull-out designs, while others are pop-up trundles that rise to match the height of the main bed—giving you the option to push them together as a makeshift double. Most are designed to accommodate UK standard single mattresses (90cm x 190cm), although some children's beds may use slightly smaller dimensions.

The compact design makes trundle beds ideal for box rooms, guest rooms, or even living rooms in smaller flats. Look out for designs with added storage drawers or solid side panels if you want a more finished look.

How It Works

Using a trundle bed is straightforward. The lower bed is mounted on castor wheels or sliding rails and can be pulled out easily using a built-in handle or finger-pull. Once extended, it sits flat on the floor or, in pop-up models, locks into place at full height. There’s no need for tools or heavy lifting - just pull it out, pop on some bedding, and it’s ready for guests.

When not in use, the trundle bed slides back under the main frame and stays out of sight, making it ideal for multi-use rooms where space comes at a premium. It’s a practical solution for UK homes where bedrooms often double up as study spaces or playrooms during the day.

Sizes and Configuration

Trundle beds are available in various sizes and formats, allowing you to find a style that suits your space and needs. Whether you're shopping for a child’s room, a guest bedroom, or a multifunctional living area, there’s more choice than ever on the UK market. While the pull-out trundle is almost always a standard single, the main bed can come in different dimensions depending on the frame design.

Single Over Single (Most Common in the UK)

The most traditional and widely available trundle bed configuration is a standard UK single bed with a pull-out single trundle beneath it. Both beds accommodate single mattresses, typically measuring 90cm x 190cm. These designs are especially popular in children's bedrooms, student accommodation, and compact guest rooms. The benefit here is the minimal footprint when the bed is not in use, as the trundle tucks neatly underneath the main frame. It's a simple and affordable way to provide occasional sleeping space without crowding the room.

Larger Bed Sizes with Trundles

For those who want more sleeping space on the main bed, some trundle frames are now available in small double, double, king, or even super king sizes. These options are ideal for teens, couples or anyone using the main bed as their everyday mattress. Here are some common UK dimensions you might come across:

• Small Double: Approximately L 213cm x W 120cm
• Double: Approximately L 213cm x W 140cm
• King: Approximately L 218cm x W 159cm
• Super King: Approximately L 218cm x W 190cm
• Trundle Mattress: Typically remains at a UK single size - around L 190cm x W 90cm

In these designs, the trundle bed remains lower in profile and slides under the larger bed frame. It's an excellent choice if you want to accommodate guests but don’t want the room to feel dominated by two full-sized beds.

Daybeds with Trundles

Daybeds are a stylish alternative that combine form and function. These designs resemble a sofa or lounger during the day, often featuring armrests and backrests. They’re great for dual-use rooms such as home offices or reading nooks. Most daybeds with trundles take a single mattress on top and house a pull-out single underneath, just like traditional trundle beds. However, their aesthetic makes them more suited to spaces where you want the bed to blend into the overall décor.

Some UK shoppers prefer daybeds for occasional guests or teenage bedrooms, where the room needs to serve multiple purposes without sacrificing comfort or appearance.

Trundle Beds with Drawers

Some trundle beds are cleverly designed to include built-in storage drawers alongside or instead of a traditional pull-out trundle. These hybrid frames may feature a single mattress on top, with storage space underneath divided into drawers and compartments, sometimes combined with a hidden trundle bed.

This is ideal for families short on cupboard space, as it offers somewhere to stash bedding, toys, books, or out-of-season clothing. In small UK bedrooms where under-bed storage is a must, this design adds practicality without compromising on style or comfort. When shopping, look for frames with smooth-glide drawer runners and solid base panels for better long-term durability.

Materials and Styles

Trundle beds are available in a variety of materials and design styles, giving you plenty of options to suit your home décor and practical needs. While all trundle beds follow a similar structure, the choice of frame, support type, and finish can make a significant difference in terms of durability, aesthetics, and day-to-day use.

Common Frame Materials

When it comes to the construction of trundle beds, most options fall into one of two categories: wood or metal. Both have their benefits, depending on the look you prefer and how the bed will be used.

• Wood Frames: Wooden trundle beds are often made from pine, oak, or MDF, and tend to suit traditional, rustic, or Scandi-inspired interiors. Solid wood frames are usually more durable and stable, making them ideal for everyday use in children’s rooms or guest spaces.
• Metal Frames: Metal frames are lightweight and often more affordable. They work well in contemporary or minimalist bedrooms and are commonly found in black, white, or silver powder-coated finishes. Metal trundle beds are generally easier to move and can be a great choice for occasional use or smaller flats.

Mattress Support Types

Underneath the mattress, trundle beds typically use one of two support systems: slats or platform bases. Both are built to support a mattress directly - without the need for additional components.

• Wooden Slats: Most trundle beds feature wooden slats - horizontal boards that span the bed frame. These offer good airflow for the mattress and a bit of natural give for comfort. Look for beds with solid or sprung slats if the bed will be used regularly.
• Platform Bases: Some metal trundle beds use a flat, mesh-style platform instead of slats. These bases are sturdy and low-maintenance but may offer less airflow and flexibility than wooden slats.

No Box Spring Required

Unlike some traditional bed frames, trundle beds are designed for use without a box spring. The mattress rests directly on the slats or platform base, which keeps the bed height low and ensures the trundle can fit neatly underneath. This also simplifies setup and helps save on costs and materials.

Style Options to Match Your Home

Whether you prefer classic charm or a more modern look, there’s a trundle bed style to suit your interior.

• Traditional Styles: These often include turned wood legs, decorative side rails, or panelled headboards. Ideal for cosy guest rooms or family homes with a classic design theme.
• Modern and Minimalist Designs: Clean lines, neutral colours, and slim profiles make these beds well-suited for urban flats and smaller bedrooms where space is limited.
• Daybed-Inspired Looks: Many trundle beds double as daybeds, especially in metal or mixed-material frames. These styles are ideal for multi-use rooms where you want the bed to look more like furniture during the day.

Comparison to Other Beds

Trundle beds aren’t the only space-saving sleep solution out there - but they do offer some unique advantages over more common alternatives. Here’s how they compare to other popular multi-purpose beds found in UK homes.

Bunk Beds

Bunk beds are a familiar choice for siblings sharing a room, but they’re not always the most practical solution for every household.

• Lower and Safer: Trundle beds sit close to the ground, making them a safer option for younger children or households with limited ceiling height.
• Maintain Room Flexibility: Bunk beds are fixed in place, while trundle beds can be rolled out only when needed - making them a better fit for rooms that serve multiple purposes throughout the day.
• Easier to Assemble: Most trundle beds are easier to set up and move compared to bunk beds, which can be heavy, tall, and awkward to position.

Sofa Beds

Sofa beds are another space-saving staple, but they’re often bulkier and can compromise on comfort.

• More Comfortable for Sleeping: Trundle beds use proper mattresses on both levels, offering a better night’s sleep compared to the thinner fold-out cushions found in many sofa beds.
• Less Effort to Set Up: Pulling out a trundle is usually quicker and requires less rearranging than unfolding a sofa bed, especially in tight spaces.
• Discreet Design: Trundle beds maintain the look of a standard bed and slide out of sight when not in use, making them more discreet than a large sofa bed dominating the room.
• Better for Bedrooms: While sofa beds are great in living rooms, trundle beds are better suited to bedrooms or multipurpose spaces where the room is primarily for sleeping.

Futons

Futons offer a low-cost alternative to guest beds but are often best for occasional or very short-term use.

• Retain Mattress Shape: Trundle beds maintain the shape and support of a mattress over time, unlike futons which can sag or compress with frequent use.
• More Versatile Option: Trundle beds are more versatile than futons as they provide two separate sleeping surfaces, can be used in a wider range of rooms, and offer more comfort and structure overall.
• More Appealing in Shared Rooms: Futons can appear more casual or makeshift, while trundle beds maintain the look of a standard single or day bed, fitting in more naturally with the rest of your furniture.

Benefits of a Trundle Bed

Trundle beds are a practical and space-conscious solution for households that need flexible sleeping arrangements. Whether you live in a compact city flat or want to make the most of a small bedroom, a trundle bed offers convenience without compromising on comfort. It’s one of the few furniture pieces that can double your sleeping capacity without demanding more square footage.

Here are some of the key benefits of choosing a trundle bed:

• Space-Saving Design: A trundle bed offers two beds in the space of one. The second bed remains hidden under the main frame until needed, making it ideal for smaller rooms where floor space is limited.
• Great for Sleepovers: Whether it’s your child’s friends staying the night or an unexpected guest dropping by, trundle beds provide a comfortable extra bed without the fuss of inflatables or folding camp beds.
• Multi-Purpose Room Friendly: In homes where rooms serve more than one function - such as a home office doubling up as a guest room - a trundle bed provides sleeping space without permanently occupying the area.
• No Need for Extra Furniture: With a trundle bed, you don’t need to invest in bulky guest beds or keep a spare mattress tucked in a cupboard. Everything stays neatly in place until it’s needed.
• Easy to Use: Most trundle beds come with smooth-glide wheels or runners, so the lower bed can be pulled out and set up in seconds. No tools or heavy lifting required.
• Cost-Effective Option: Purchasing a trundle bed can often be more affordable than buying two separate beds, especially when factoring in the savings on space and extra furniture.

Ideal Use Cases in UK Homes

Trundle beds are particularly useful in certain living situations, especially in the UK where space can be tight and homes often need to serve multiple purposes. Here are some ideal scenarios where a trundle bed truly shines:

• Children’s or Teen Bedrooms: Perfect for hosting friends without needing to squeeze two full beds into one room. It’s also useful for shared bedrooms, where the trundle can stay tucked away during the day.
• Studio Flats or City Apartments: In compact spaces, a trundle bed can function as a daybed or sofa, while the pull-out section accommodates guests as needed - without overwhelming the room.
• Guest Rooms or Multipurpose Spaces: A home office or snug can easily double up as a guest room when fitted with a trundle bed. It keeps the space functional by day and guest-ready by night.

Whether you’re preparing for regular visitors or just want to be ready for the occasional overnight guest, a trundle bed provides a thoughtful balance of comfort, function, and practicality.

Drawbacks

While trundle beds are practical for many UK households, they may not be the right solution for everyone. Here are some potential drawbacks to keep in mind before making a purchase:

• Thinner Mattress for the Trundle: To fit beneath the main bed, the trundle mattress usually needs to be no thicker than 15 - 18cm. This can mean less cushioning and support, particularly for adults or long stays.
• Limited Weight Capacity: Many trundle bed frames are designed with children or occasional use in mind. The lower bed may not support the same weight as a regular frame, making it less suitable for heavier adults.
• Manual Setup Required Each Time: Although quick and easy, you’ll still need to pull out the trundle and dress it with bedding before use. This might feel inconvenient if you’re hosting guests frequently.
• No Extra Storage Space: Because the space under the main bed is taken up by the trundle, there’s no room for storing boxes, drawers, or other under-bed items - unless you opt for a hybrid design with integrated storage.
• Less Suitable for Everyday Sleeping: The lower bed is often closer to the floor and may not be comfortable enough for regular use. It’s better for short-term stays rather than as a permanent sleeping solution.

Maintenance and Care Tips

To keep your trundle bed in good condition and functioning smoothly, a bit of regular maintenance goes a long way. Whether it’s used daily or just pulled out for the occasional guest, these simple care habits will help prolong its lifespan and maintain comfort for anyone sleeping on it.

1. Keep the Under-Bed Area Clean

Because the trundle bed sits close to the floor, it naturally collects more dust and debris than higher frames. This can lead to allergens building up around the mattress or wheels.

• Vacuum or sweep underneath the main bed regularly, especially if the trundle isn’t used often.
• Use a low-profile bed skirt or valance to help reduce the amount of dust collecting under the frame.

2. Check the Wheels or Sliding Mechanism

Trundle beds rely on castor wheels or sliding rails to glide in and out smoothly. Over time, these components can become stiff, misaligned, or worn.

• Inspect the wheels or sliders every few months to make sure they’re moving freely and haven’t gathered hair, dust, or dirt.
• Apply a small amount of silicone-based lubricant to metal runners or joints if they start to squeak or stick-avoid oil-based products that can stain carpet or flooring.

3. Choose the Right Mattress Type

Trundle beds require thinner mattresses than standard beds to ensure they slide in and out without obstruction. Using the wrong size can damage the bed or make it difficult to store.

• Stick to mattresses no thicker than 15-18cm, depending on your frame’s clearance height.
• Choose a flexible mattress type, such as memory foam or low-profile hybrid designs, which bend slightly if needed and fit snugly under the main bed.
• Avoid rigid spring mattresses, which may be too tall or too firm to tuck away easily.

4. Protect the Mattress When Not in Use

If the trundle bed is only used occasionally, the mattress can gather dust or become musty when stored for long periods.

• Use a breathable mattress cover or protector to keep it clean while stored.
• Lift the trundle out to air the mattress every few weeks, especially in humid weather, to prevent moisture build-up or mildew.

5. Avoid Overloading the Trundle Bed

Each trundle bed will have its own weight limits - especially on the pull-out section, which may be less robust than the main frame.

• Check the manufacturer’s weight capacity, especially if adults will be using the lower bed.
• Avoid children jumping on the trundle, as the lower frame may not be designed to take excessive force.

By following these maintenance tips, you’ll keep your trundle bed comfortable, clean, and easy to use - making it a dependable piece of furniture for years to come.

Now that you know all about trundle beds - how they work, where they fit best, and what to watch out for - they’re clearly a smart option for making the most of your space. Whether you're furnishing a child’s room, a spare bedroom, or a multifunctional home office, a trundle bed offers flexibility and comfort without clutter. With the right style and regular care, it can serve as a practical addition for years to come.

To explore all our beds, mattresses, and bedding range, check out the links below and find the right fit for your home.