Double Mattresses
Double mattresses are our most popular size - perfect for couples, solo sleepers, and growing teens. Choose from hundreds of in-stock options, including memory foam, pocket sprung, or latex. Shop trusted UK brands like Silentnight and Simba - all with free next day delivery.
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SleepSoul Comfort 800 Pocket Mattress
RRP £329.99
Sealy Mellbreak Ortho Plus Mattress
RRP £619.00
Silentnight Essentials Mirapocket 1000 Mattress
RRP £447.00
Horizon Odyssey 800 Pocket Memory Mattress
RRP £700.00
SleepSoul Luna Posturezone 1000 Pocket Ortho Mattress
RRP £649.99
Relyon Cerrado 1000 Pocket Pillow Top Mattress
RRP £823.00
Sealy Alford Advantage Mattress
RRP £529.00
SleepSoul Heaven 1000 Pocket Gel Mattress
RRP £419.99
Romantica Serenade Ortho Mattress
Luna Memory 2500 Pocket Hybrid Mattress
RRP £870.00
Hypnos Hemsworth Luxury Mattress
RRP £1,110.00
Sealy Posturepedic Elevate Blackwood Mattress
RRP £1,549.00
Hypnos Marlow Ortho Deluxe Mattress
RRP £1,900.00
Millbrook Smooth Tech 4000 Pillow Top Mattress
RRP £1,302.00
Rock Hard Ultra Firm Mattress
RRP £550.00
Aspire Natural Cashmere 1000 Pocket Mattress
RRP £359.00
Mlily Bamboo+ Ortho Memory 800 Pocket Mattress
RRP £685.00
SleepSoul Space 2000 Pocket Memory Pillow Top Mattress
RRP £659.99
Romantica Bamboo Memory Mattress
Silentnight Sofia 1200 Mirapocket Mattress
RRP £638.00
What size is a UK double mattress?
All of our UK double mattresses measure 135cm x 190cm (4'6" x 6'3") - the ideal size for couples, guest rooms, or solo sleepers who want more space.
Will a double mattress fit my bed?
If your bed frame fits a 135cm x 190cm mattress, any double mattress from our range will fit perfectly.
Whether you're shopping for a mattress for a double bed or looking for a double-size mattress, we’ve got options in stock and ready to ship.
How deep should my double mattress be?
Most of our double mattresses range from 20cm to 30cm deep, giving you plenty of choice to suit your current bed frame and bedding. Whether you prefer a low-profile style or extra-deep luxury, we’ve got a double mattress to suit your needs.
How firm should my double mattress be?
Our double mattresses come in every firmness level to suit your sleep style:
- Soft-medium - gentle cushioning
- Medium - balanced support for most sleepers
- Medium-firm - ideal for couples with different comfort needs
- Firm - great for back sleepers
- Extra firm - our most supportive feel
Not sure what firmness is right for you? Try our 60-Night Comfort Trial risk-free.
How much do double mattresses cost?
Double mattress prices vary based on brand and materials, but we’ve got options for every budget:
- Budget: from £200 - affordable comfort you can rely on, every night
- Mid range: £300-£400 - enhanced support and added features for long-term comfort
- Premium: £600-£3000+ - luxury craftsmanship from the UK’s top mattress brands
We work directly with trusted names like Silentnight, Sealy, and Harrison Spinks to offer the best quality double mattresses at every price point.
You'll find our best price double mattresses in the latest double mattress sale - all with free next day delivery.
Can you take away my old double mattress?
Yes, when you order a double mattress from Mattress Online, we can take your old one away for just £35.
Our non-profit recycling service ensures every part of your old mattress is responsibly processed - giving you peace of mind with your purchase.
Advice and buying guides
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Why buy from Mattress Online?
Free delivery to most locations
Free next working day delivery on most of our mattresses and beds, or upgrade to weekend delivery.
Free 60-night mattress comfort trial
Test your mattress for 60 nights and if you don't like it, simply swap it.
Old mattress disposal
We can collect and recycle your mattress - saving it from landfill.
Sales Enquiries
Mon-Sat: 9:30am - 5:30pm
Sunday: 10am - 4pm
Customer Service
Mon-Sat: 9:30am - 5:30pm
Sunday: Closed
