Choosing a new mattress is an investment in your health, but before you dive into the world of pocket springs and memory foam, there is one crucial hurdle to clear: size.
At Oliver & Sons, we understand that a mattress isn't just a sleeping surface; it's the centerpiece of your sanctuary. Get the size wrong, and you risk a cramped night's sleep or a bedroom that feels cluttered and claustrophobic. In the UK, mattress sizes are standardised, yet many shoppers find themselves confused between a "Small Double" and a "Standard Double," or wondering if a "Super King" will actually fit through the bedroom door.
1. Why Size Matters: More Than Just Millimetres
The size of your mattress dictates the "sleep architecture" of your room. Too small, and you'll be disturbed by your partner's every move; too large, and you'll struggle to open your wardrobe doors.
Key considerations include:
- Your Height: Your mattress should be at least 10cm longer than the tallest person sleeping in it.
- The "Partner Gap": You should be able to lie side-by-side with your hands behind your head without your elbows touching.
- The Golden Ratio: Ideally, your bed should occupy no more than 1/3 of your bedroom's total floor space to maintain a sense of calm.
2. Standard UK Mattress Sizes: The Breakdown
At Oliver & Sons, our handcrafted frames are built to accommodate standard UK mattress sizes. Here is a detailed look at each one:
Small Single (2'6" x 6'3" / 75 x 190cm)
The most compact of the range, the Small Single is designed for very tight spaces.
Best for: Toddlers transitioning to their first "big bed," box rooms, or narrow guest rooms.
Oliver & Sons Tip: Pair this with a light-coloured fabric to make a small guest room feel less crowded.
Standard Single (3'0" x 6'3" / 90 x 190cm)
The UK's most popular choice for children and solo sleepers.
Best for: Kids, teenagers, and guest rooms.
Space Tip: A single bed allows plenty of room for a desk or wardrobe in a standard 3m x 3m bedroom.
Small Double (4'0" x 6'3" / 120 x 190cm)
Also known as a "Queen" or "Three-Quarter" bed, this size has seen a massive surge in popularity.
Best for: Solo sleepers who want extra room to stretch, or couples with a very small master bedroom.
The "Teenager's Dream": This is the ideal upgrade for an older child who has outgrown a single but doesn't have the space for a full double.
Standard Double (4'6" x 6'3" / 135 x 190cm)
The hallmark of British bedrooms. While it is the standard for couples, many find it a bit "cosy" once you factor in pillows and duvets.
Best for: Average-sized couples and standard UK master bedrooms.
Note: You only get 67.5cm of space each—that's less than a baby has in a cot!
King Size (5'0" x 6'6" / 150 x 200cm)
This is where true luxury begins. A King Size mattress is not only wider than a double but also longer.
Best for: Couples where one or both partners are over 5'9" (175cm).
Why it's better: The extra length prevents your feet from dangling off the edge, and the extra width significantly reduces motion transfer (being woken up by your partner).
Super King (6'0" x 6'6" / 180 x 200cm)
The ultimate statement in sleep luxury. The Super King is essentially two single mattresses pushed together.
Best for: Families who enjoy "Sunday morning huddles" with kids and pets, or couples who value maximum personal space.
The Hotel Feel: If you want your bedroom to mimic a five-star suite, the Super King is the only way to go.
3. How to Measure Your Room Like a Professional
Before ordering your bespoke Oliver & Sons bed, you must ensure it fits. Remember: The mattress size is the internal measurement; the bed frame will be larger.
- Map it out: Use masking tape on your floor to mark the dimensions of the bed frame (not just the mattress).
- Check the "Walkways": Ensure you have at least 60cm (24 inches) of clearance around the sides and foot of the bed.
- The "Drawer Test": If you are buying a storage bed or have bedside tables, ensure there is room for drawers to open fully.
- Path to the Room: Don't forget the stairs! Measure your hallway width and ceiling height at the turn of the stairs. For Super King beds, we often recommend "Zip & Link" mattresses to make delivery easier.
4. Special Sizes: Zip & Link Mattresses
For those with narrow staircases or homes with difficult access, Oliver & Sons offers Zip & Link options. These consist of two independent mattresses that can be zipped together to create a King or Super King.
- Versatility: Ideal for guest houses where you may need to swap between two singles or one large bed.
- Zero Motion Transfer: Because the bases are separate, you won't feel your partner turning over at night.
5. Choosing the Right Size for Life Stages
- For the First-Time Buyer: If you're moving into a flat, a Standard Double is your safest bet for balancing comfort and floor space.
- For Growing Families: If your kids tend to crawl into bed with you at 2 a.m., a King or Super King is an investment in your sanity and sleep quality.
- For the "Empty Nesters": Now is the time to reclaim your bedroom. If the kids have moved out, treat yourself to the Super King you've always wanted.
6. Mattress Thickness & Headboards
When considering size, don't forget height. A premium handcrafted mattress from Oliver & Sons can be 25cm to 35cm deep.
- Total Height: Consider the height of the base + the mattress. If you have mobility issues, you want a height that allows you to sit on the edge with your feet flat on the floor.
- Headboard Proportions: A Super King mattress needs a tall, commanding headboard to look balanced. Our floor-standing headboards are designed to provide that "grand" aesthetic regardless of mattress width.
7. The Oliver & Sons Bespoke Difference
Unlike mass-market retailers, our beds are made to order in the UK. This means we can ensure your frame is perfectly upholstered to sit flush with your chosen mattress size, eliminating the unsightly gaps often found in cheap imports.
Whether you choose a sleek Ottoman for a Small Double or a majestic Chesterfield Super King, our frames are engineered to support the specific weight and dimensions of your mattress.
8. Summary Table: UK Mattress Dimensions
| Size Name | Metric (cm) | Imperial (ft/in) | Best For |
|---|---|---|---|
| Small Single | 75 x 190 cm | 2'6" x 6'3" | Toddlers & box rooms |
| Standard Single | 90 x 190 cm | 3'0" x 6'3" | Children & solo sleepers |
| Small Double | 120 x 190 cm | 4'0" x 6'3" | Teenagers & guest rooms |
| Standard Double | 135 x 190 cm | 4'6" x 6'3" | Average couples |
| King Size | 150 x 200 cm | 5'0" x 6'6" | Tall sleepers & master suites |
| Super King | 180 x 200 cm | 6'0" x 6'6" | Total luxury & families |
Conclusion: Don't Compromise on Your Comfort
A mattress that is too small will eventually lead to poor sleep, while one that is too large will make your bedroom feel like a storage unit. By measuring accurately and considering your long-term needs, you can choose a size that brings harmony to your home.
At Oliver & Sons, we believe every sleeper deserves a bed that fits their life perfectly. From compact singles to sprawling super kings, our British-made beds are the ultimate foundation for your chosen mattress.
Ready to find your perfect fit?
Explore our Bespoke Bed Frame Collection to see how our sizes look in different styles, or Contact Our Experts if you need advice on measuring your space.
