Best Caravan Mattress Sizes For Island Bed Layouts: Exact Dimensions, Easy Measuring & Real-World Examples

Island beds are one of the most popular caravan layouts because you can walk around them and get in from both sides, but choosing the right mattress size is not always straightforward. Island bed mattresses in caravans are typically 140–150 cm wide and 190–200 cm long, yet manufacturers often tweak shapes and lengths to squeeze the most from limited space. In this guide we walk you through the best caravan mattress sizes for island bed layouts, how to measure accurately, and which style of mattress or topper suits each layout.

Key Takeaways

1. Understanding Caravan Island Bed Sizes: Why They Differ From Home Mattresses

Island beds look like domestic beds at first glance, but caravan dimensions work very differently. To keep walkways usable and doors opening properly, caravan mattresses are usually shorter and narrower than their home equivalents, and island layouts often include a tapered or curved foot section.

In UK caravans, island bed mattresses typically sit around 140–150 cm in width and 190–200 cm in length. That gives enough space for two adults while still allowing access on both sides. However, the corners and foot end can be angled, radiused, or softly curved, which is where custom shaping becomes important.

Many customers tell us they tried a standard domestic double or king-size first, only to find it blocked the wardrobe or stopped drawers opening. This is why we always start with the base footprint rather than the label on the old mattress. Once we have accurate measurements, we can match the size, thickness, and shape of your island bed precisely.

2. Typical Widths And Lengths For Island Bed Layouts

Although every caravan brand has its own variation, there are clear patterns in island bed sizes. Many island layouts fall within a relatively small range, which helps us recommend the right starting point even before you reach for a tape measure.

The table below summarises common island bed footprints used in touring caravans. These are approximate single-piece mattress sizes, not including infill cushions or slide-out sections.

These ranges show why a simple label like “double” or “king” is not enough in a caravan context. Two caravans both advertised with king-size island beds can differ by several centimetres in both length and width, not counting shaping at the foot end. That is why we always combine this size knowledge with a proper measuring process.

3. Measuring Your Island Bed: Getting The Size Right First Time

The best caravan mattress size for your island bed starts with accurate measurements of the base, not the old mattress. Frames are often slightly smaller than the existing mattress, which is why you may have struggled to change bedding or move around the bed comfortably.

We recommend following a point‑by‑point method, as set out in our island bed measuring resources, where you record the maximum width, the straight section lengths, and the depth of any curve or angle. This gives us a clear template for either a one-piece or two-piece island mattress.

• Measure maximum width across the bed at its widest point.
• Measure full length from headboard to the furthest point of the foot curve or angle.
• Note curve or angle depths by measuring straight sections and the distance from straight edge to the deepest part of the curve.
• Record thickness limits by checking cupboards, overhead lockers, and under‑bed storage clearances.

Once you have these dimensions, we can recommend the closest standard caravan size or confirm a fully custom island mattress. This process is particularly important if you want to change thickness, for example moving from a 10 cm budget mattress to a deeper and more supportive option.

4. One-Piece Vs Two-Piece Island Mattresses: Which Size Approach Works Best?

Many caravan owners assume an island bed must use a single, solid mattress, but that is not always the most practical choice. Two-piece island-bed configurations are very common, especially where the base slides in and out or where access through the caravan door is tight.

A two-piece design keeps each section manageable to carry, while still giving you the overall width and length you need when the bed is made up. Some layouts also use an infill cushion or fabric link between the two halves, which can be helpful if you want the option to fold part of the bed away during the day.

From a sizing perspective, we treat two-piece island mattresses as one footprint. We design both sections so they perfectly follow the island bed frame when pushed together. This avoids gaps and ridges and helps you get the most from the available width, whether that is closer to a compact double or a generous king-size layout.

5. Curved, Angled And Soft-Curve Island Beds: Matching Shape To Size

The biggest difference between caravan island mattresses is not just overall size, it is the shape at the foot end. Some caravans use a sharp diagonal cut, others a semi-circular curve, and some a gentle soft-curve that just rounds the corners.

Each of these shapes can be produced in a wide range of sizes, so we classify them by both footprint and corner type. If you tell us that your bed is, for example, around 140 x 190 cm with a strong diagonal at the foot, we know that an angled island design is likely to be the best match.

Tip: When measuring, sketch the bed shape and mark your measurements on the drawing. It helps us understand whether you need an angled, curved, or soft-curve island design in your exact size.

Soft-curve and crescent styles are particularly popular in premium caravans because they feel more like a domestic bed while still easing movement past the foot. In those layouts, a custom-cut mattress such as our Grand Crescent style can be specified in anything from a compact double footprint up to a very generous super-king size.

6. Island Mattress Toppers: When Size Is Right But Comfort Is Wrong

Quite often, the base island mattress in your caravan is the right size and shape, but it is too firm, too thin, or simply worn out on top. In those cases, a shaped mattress topper is an effective way to improve comfort while keeping your existing size and layout.

Bodyshape™ Memory Foam Island Toppers (Angled, Curved & Soft-Curve)

Our Bodyshape™ toppers follow the same island sizes and shapes as full mattresses, so you can choose an angled bolster, curved bolster, or soft-curve bolster to suit your layout. Because they match the existing bed footprint, you retain the correct walkway space while gaining better pressure relief.

The Single Memory Foam Island Angled Bolster Topper uses Vasco™50 pressure-relieving foam and a breathable TENCEL® cover. For caravans with a fully curved foot end, the Single Memory Foam Island Curved Bolster Topper and the Single Memory Foam Island Soft Curve Bolster Topper follow the same dimensions, but with a different curve profile.

Because these are cut for single island halves, they are ideal if your island mattress is split. Each piece follows the exact shape of its half, which means you do not lose the benefit of a shaped island bed when you add extra comfort on top.

7. Coolplus™ ReVo™ Gel Island Mattresses: Best Sizes For Warm-Sleeping Tourers

If you find your island bed too warm, especially on summer tours, a cooling mattress sized specifically for your layout can make a real difference. Our Coolplus™ range uses ReVo™ gel-infused foam for around 30 times the breathability of standard memory foam, while still being cut to exact island dimensions.

Coolplus™ Single Island Angled And Curved Sizes

The Coolplus Single Island Angled Mattress is designed for layouts with an angled foot end. It combines a Laytec™ comfort layer with the ReVo™ cooling layer and a supportive base foam, and is available in different depths to suit your under‑bed storage height and headroom.

For curved island beds, the Coolplus Single Island Curved Mattress uses the same triple-layer construction, but follows a fully radiused foot end. That means you can enjoy a cooler, more breathable sleep without sacrificing any of the access benefits of a rounded island bed.

Both variations are made to size for your specific caravan. That means if your island bed is closer to a compact double or a generous king, we simply adjust the footprint while keeping the same cooling performance and island shape.

8. Matching Mattress Thickness To Your Island Bed Size

Mattress thickness is just as important as width and length, especially on island beds where overall height affects how easily you can sit up or access under‑bed storage. Typical caravan mattress depths are around 10 cm, 15 cm, or 20 cm, each suiting different layouts and body weights.

On a shorter island bed, a slimmer mattress can help taller sleepers gain a little extra effective length, since their feet are less likely to meet a thick, rigid border at the end. On larger island beds, many customers prefer a 15–20 cm depth for a more home-like feel, as long as it does not interfere with wardrobes, lockers, or windowsills.

• 10 cm depth: suits lighter users, low headboards, or where the island bed sits under a window.
• 15 cm depth: a good all‑round choice for most island beds and sleeping preferences.
• 20 cm depth: ideal on larger island beds or premium pocket-spring builds, where storage and headroom allow.

We always match thickness to your bed base and personal preferences, not just the label on the old mattress. If you tell us your current depth and whether you want the bed to feel higher, lower, firmer or softer, we can steer you towards the most suitable construction at the right size.

9. Pocket-Spring Vs Foam: Best Constructions For Different Island Bed Sizes

Once your island mattress size is agreed, the next decision is internal construction. Larger beds, such as king or super king island layouts, benefit from more advanced support systems because weight is spread over a bigger surface and two sleepers usually share the bed.

Pocket-spring options like our Imperial Elite™ 2000 and Grand Crescent™ formats use thousands of individually wrapped springs, which adapt to each sleeper and limit partner disturbance. Foam-based designs such as Bodyshape™ and Coolplus™ use carefully layered foams to give consistent support from edge to edge, an advantage on smaller island beds where you use the full width.

Whichever build you choose, the key point is that we tailor the support system to your exact island size, rather than forcing you into a limited set of domestic double or king dimensions.

10. How To Choose The Best Size For Your Specific Island Bed Layout

Putting everything together, the best caravan mattress size for your island bed layout comes down to four simple checks. If you work through these in order, you will quickly narrow down the right size, shape, and thickness for your caravan.

1. Confirm maximum footprint: Measure the bed base length and width and note any taper, curve, or angle.
2. Check movement space: Make sure your preferred size still allows you to walk around the bed and open doors and drawers.
3. Decide on one-piece or two-piece: Consider access through the caravan door, weight, and whether the base slides.
4. Match construction and depth: Choose pocket-spring or foam and a thickness that suits your comfort and storage needs.

If you are unsure midway through, send us your measurements and a quick photo of the bed. With over 40 years of combined experience, we can usually recognise the layout, suggest the most suitable island bed size category, and advise on whether you would benefit from a shaped mattress, a split design, or simply a well-fitted topper.

Conclusion

Island bed layouts give you the convenience of a walk‑around bed and the comfort of a proper double, queen, or king-size sleeping surface, but only if the mattress size and shape are correct. Because caravan island mattresses are typically 140–150 cm wide and 190–200 cm long, with unique curves and angles, standard domestic sizes rarely fit well.

By accurately measuring your island bed base, deciding whether you prefer a one-piece or two-piece setup, and matching construction and depth to your layout, you can achieve home‑level comfort without wasting valuable space. Whether you need a shaped replacement mattress or a made-to-measure topper, we are here to help you find the best size and design for your specific island bed layout so you can sleep like home, wherever you roam.