Double Bed – Complete Guide to Sizes and Buying Tips

A double bed is one of the most common choices for couples and single sleepers who want extra space, but understanding the exact dimensions and practical implications is essential before making a purchase. The standard UK double mattress measures 135 × 190 cm (4 ft 6 in × 6 ft 3 in), a size that balances floor-space efficiency with sleeping comfort. However, many buyers are surprised to learn that the bed frame itself is significantly larger than the mattress, a factor that becomes critical when planning a bedroom layout.

Understanding the true size of a double bed

When retailers refer to a “double bed,” they are typically describing the mattress size. The standard double mattress in the United Kingdom is 135 cm wide and 190 cm long. This is consistent across major retailers and industry guides from Bensons for Beds, Dreams, Argos, and IKEA. The Which? consumer organisation also confirms this dimension as the standard for UK double mattresses.

A double mattress provides 135 cm of width for two sleepers. While this is widely considered a cosy fit for a couple rather than a spacious one, it remains a popular solution for smaller bedrooms where a king-size (150 cm) or super-king (180 cm) would not fit comfortably. At 190 cm in length, the standard size may be restrictive for taller individuals; those over 6 ft may benefit from a longer alternative, such as a long double or a king-size mattress.

The frame is always bigger than the mattress

A common mistake when buying a double bed is to assume the overall footprint matches the mattress dimensions. In reality, the bed frame adds several centimetres on each side. Headboards, side rails, and footboards all contribute to the total floor space required. Retail bed guides consistently stress that measuring the assembled footprint is vital, particularly for storage beds that include drawers, ottoman lift mechanisms, or divan bases.

The main storage styles available in the UK market include:

• Ottoman storage beds: The mattress lifts up to reveal a large under-bed compartment, ideal for bulky items.
• Drawer storage beds: One or more drawers are built into the base, offering easy access to stored items.
• Divan storage beds: A base that incorporates drawers, often purchased as a complete set with a mattress.
• Platform/storage frames: Fixed storage space beneath the sleeping surface, accessible by lifting the slatted base.

Because these storage mechanisms require clearance for opening drawers or lifting the mattress platform, you should always measure the entire assembled bed before committing to a purchase. This is especially true for ottoman styles, which need extra space at the foot or side of the bed to allow the gas-lift mechanism to operate fully.

Suitability for couples and tall sleepers

Industry experts and retailers such as Argos and Dreams describe a double bed as a good option for two adults, but they are quick to note that it is a cosy arrangement. Each sleeper has roughly the same width as a cot mattress, so couples who value personal space during the night may find the double restrictive. For those who are tall, the standard 190 cm length may leave feet overhanging the edge of the mattress, which can be uncomfortable and disrupt sleep quality.

The Victoria Linen guide to double beds advises tall individuals to consider a long double mattress or to look at king-size options if the room allows. Long doubles typically offer the same 135 cm width but with an additional 5–10 cm in length, providing a better fit without increasing the bed’s width.

Essential buying tips for a double bed

Before you make a purchase, there are several practical checks that can save you time, money, and the hassle of returns. The following recommendations are drawn from consumer guides and retailer advice:

• Measure the assembled footprint, not just the mattress area. This is particularly important for storage beds, which occupy more floor space than a standard frame.
• If you are tall, consider a long double or another longer size. Standard double mattresses may not provide enough legroom for people over 6 ft.
• Check bedding compatibility before purchase. Fitted sheets must match the actual mattress length. Buying the wrong size is a common and avoidable mistake.
• Test the storage mechanism if possible. Ottoman lifts and drawers differ significantly in ease of use and the amount of clearance they need. Visiting a showroom can prevent post-purchase disappointment.

Retailers like Bensons for Beds and Dream also recommend leaving at least 60 cm of walking space around the bed to ensure the room feels comfortable and functional. Drawer and ottoman mechanisms require even more clearance, so always check the manufacturer’s specifications for the minimum space needed.

Consider the long-term value

Reliable 2025 price data for double beds varies across the market depending on frame material, storage configuration, and mattress quality. A simple metal or wooden frame is typically the most affordable option, whereas an ottoman or divan bed with integrated storage will command a higher price due to the added mechanisms and assembly costs. Mattress quality also plays a major role in the overall cost, with pocket-sprung, memory foam, and hybrid models occupying different price brackets.

Investing in a well-constructed frame and a supportive mattress is important because a double bed is often a long-term purchase. Cheap frames may wobble or squeak after a few years, and a low-quality mattress can lead to poor sleep and back pain. Reading independent reviews and comparing specifications across retailers can help you find a product that balances cost with durability and comfort.

Final checklist before buying

Before you add a double bed to your basket, run through this final checklist to ensure you have covered all the key points:

• Measure your room’s dimensions, including doorways and any sloping ceilings or radiators.
• Decide whether you need storage and, if so, which mechanism best suits your space and access requirements.
• Choose a mattress that fits your sleeping position and comfort preferences, and verify that fitted sheets are available in the correct size.
• Compare total prices, including delivery, assembly, and any old bed removal fees.
• Read the returns policy in case the bed does not fit or does not meet your expectations.

A double bed offers a practical balance for many households, but careful planning is essential. By measuring your room accurately, understanding the difference between mattress and frame dimensions, and choosing a storage mechanism that works for your lifestyle, you can find a double bed that serves you well for years to come.

Frequently asked questions about double beds