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Double Flat Sheets
From easy-care 200 TC to luxury 1500 TC and Mulberry Silk, from Single to Super King—discover a wide choice of high-quality flat sheets crafted with comfort and practicality in mind. Plain or Embroidered, select your preferred design and colour and outfit your bed in style.
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Finding the right bed sheet
The type of sheet you need depends on your bed, your mattress depth, and how you prefer your bedding to feel. Fitted sheets sit over the mattress and are held in place by elasticated corners - Belledorm fitted sheets are available in three depths: standard 30cm for mattresses up to 22cm, extra deep 38cm for mattresses up to 30cm including those with a topper, and ultra deep 46cm for the deepest mattresses and adjustable beds. Flat sheets sit between you and the duvet and are the traditional choice for a layered, hotel-style bed.
Fabric makes the biggest difference to how a sheet feels. 200 thread count polycotton is lightweight, crease-resistant, and quick to dry - ideal for everyday use and children's beds. Egyptian cotton uses longer-staple fibres that produce a smoother, more consistent surface, and is available from 200 to 1200 thread count. For cooler sleep, bamboo has natural moisture-wicking properties. In winter, brushed cotton flannelette traps warmth with its soft, napped finish.
All Belledorm sheet fabrics are available in matching duvet covers and pillowcases, so you can coordinate your whole bed in one thread count and colourway.
Got Double Flat Sheet Questions? We've Got Answers
A fitted sheet wraps around the mattress and is held in place by elasticated corners. It stays put overnight and is the standard base layer for most beds. A flat sheet is a single, unhemmed piece of fabric that sits between you and the duvet. It adds a layer of temperature regulation, protects the duvet cover from body oils and perspiration, and gives the bed a traditional, hotel-style finish. Many people use both together; some prefer just a fitted sheet and duvet.
The most common reason a fitted sheet pulls free is that the depth is wrong for the mattress. Measure the total depth of your mattress including any topper and choose a sheet with a box depth that matches - a 30cm sheet on a 28cm mattress will have very little fabric to tuck under and will slip off. Belledorm fitted sheets have fully elasticated edges (not just corner elastic), which keeps the sheet anchored more securely around all four sides of the mattress.
UK double bed bedding from Belledorm follows the standard dimensions used across the British bedding industry, with fitted sheet depth varying depending on your mattress.
| Product | Standard UK Size |
|---|---|
| Fitted sheet | 135cm x 190cm (4ft 6in x 6ft 3in) |
| Flat sheet | 230cm x 275cm |
| Duvet cover | 200cm x 200cm |
Fitted sheets are available in three depths: standard 30cm (12 inches) for mattresses up to 22cm deep, extra deep 38cm (15 inches) for mattresses up to 30cm including those with toppers, and ultra deep 46cm (18 inches) for the deepest luxury and adjustable mattresses. Always measure your total mattress depth, including any topper or protector, before selecting a fitted sheet depth.
A standard Belledorm double fitted sheet (135cm x 190cm) fits a UK double mattress measuring 135cm wide by 190cm long, the most common shared bed size in the UK, found in the majority of couples' beds, guest rooms, and rental properties.
The fitted sheet's length and width dimensions are fixed to the mattress size. What varies is the depth, the box measurement that wraps under the mattress edge. Belledorm offers double fitted sheets in 30cm (standard), 38cm (extra deep), and 46cm (ultra deep) depths to accommodate mattresses from basic 15cm models through to 35cm+ pocket sprung mattresses with toppers. If you are buying for a small double mattress (120cm wide), a standard double sheet will not fit correctly, check the small double 4ft range instead.
A UK double bed measures 135cm x 190cm (4ft 6in x 6ft 3in). A king size measures 150cm x 200cm (5ft x 6ft 6in), 15cm wider and 10cm longer. The two sizes use different fitted sheets, flat sheets, and duvet covers, none of which are interchangeable.
The additional 15cm width of a king size makes a meaningful practical difference for two adults sharing, each person gains approximately 7.5cm more sleeping space. The 10cm extra length is also significant for taller adults over 6ft. A double fitted sheet will not stretch to fit a king size mattress and will pull free from the corners. If you are unsure which size your mattress is, measure the width: 135cm is double, 150cm is king size, 180cm is super king.
A double bed (135cm x 190cm) accommodates two adults and remains the most common shared bed size in UK homes. Each person has approximately 67.5cm of sleeping width, comfortable for couples who sleep close together, though noticeably less spacious than a king size (75cm per person).
Double beds work well in smaller bedrooms and rental properties where floor space is limited, and are a practical choice for guest rooms. For couples who prefer more room to move independently, or for adults over 6ft where the 190cm length may feel restrictive, a king size (150cm x 200cm) is a more comfortable long-term alternative. Belledorm's double sheet range covers 121 products across all fabrics and depths, from Basics Polycotton from £10.50 through to 1200TC Cotton Sateen.
To fully dress a double bed, you need a fitted sheet, a duvet cover, and at least two pillowcases. A flat sheet is optional but recommended for a layered or hotel-style setup.
The complete double bed bedding list:
- Fitted sheet (135cm x 190cm) - in your chosen depth: 30cm, 38cm, or 46cm
- Duvet cover (200cm x 200cm) - sized for a double duvet
- Pillowcases - standard UK pillow is 48cm x 74cm; two for a double bed
- Flat sheet (230cm x 275cm) - optional, used between the fitted sheet and duvet
- Mattress protector (135cm x 190cm) - recommended to extend mattress life and add a hygiene layer
- Valance sheet - optional, used to conceal the bed base and divan legs for a neater finish
All items are available in matching fabrics and colours across Belledorm's double range, making it straightforward to build a fully coordinated set.
Yes, UK double bed sheet dimensions are standardised: fitted sheets are 135cm x 190cm, flat sheets are 230cm x 275cm, and duvet covers are 200cm x 200cm. Belledorm's double range follows these standard UK dimensions throughout.
The one variable is fitted sheet depth, this is not standardised and varies by product and brand. Always check the box depth (30cm, 38cm, or 46cm) against your mattress measurement before purchasing. One common point of confusion is the duvet cover: a double duvet cover (200cm x 200cm) is square, not rectangular, this is correct and standard across the UK industry. If you are buying bedding as a gift or for a property you cannot measure, standard UK double dimensions apply to the overwhelming majority of double beds manufactured since 2000.