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.
We've been a specialist mattress retailer since 2003, and more than 72,000 Trustpilot reviewers rate us 4.7 out of 5. Our double mattress range covers over 40 trusted brands, from Silentnight and Sealy to Hypnos and TEMPUR. A selection are Which? Best Buy or Good Housekeeping award winners. If you're not sure which is right for you, our Sleep Experts can help. Every mattress comes with a 100-Night Sleep Trial, so you can test your mattress, hassle-free.
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Size Double
Mattress Firmness
Support System
Comfort Layer
Mattress Type
Brand
Price
Mattress Depth
Romantica Serenade Ortho Mattress
Was £199
Silentnight Air Plus 800 Mirapocket Mattress
RRP £394.99
Komfi Unity Comfort Eco Foam Mattress
RRP £185
SleepSoul Heaven 1000 Pocket Gel Mattress
RRP £420
Sealy Posturepedic Elevate Blackwood Mattress
RRP £1,549
Sealy Mellbreak Ortho Plus Mattress
RRP £619
Bodyshape Classic Memory Foam Mattress
RRP £440
Emma Original Lite Mattress 2025
Romantica Bamboo Memory Mattress
Was £199
Rest Assured Adleborough 1400 Pocket Ortho Mattress
RRP £598
Hypnos Cawthorne Deluxe Mattress
RRP £857
Emma Original Elite Mattress
RRP £999
Aspire Pocket+ 1000 Memory Box Top Mattress
RRP £329
Rock Hard Mega Firm 1500 Pocket Mattress
RRP £479
Millbrook Wool Luxury 4000 Pocket Mattress
RRP £1,276
Sealy Winslow Geltex Enhance 2400 Pocket Pillow Top Mattress
RRP £1,499
Millbrook Wool Luxury Latex 4000 Pocket Mattress
RRP £1,816
Emma Original Lite Mattress
Was £315
Hypnos Marlow Ortho Deluxe Mattress
RRP £1,596
Silentnight Miracoil Memory Cushion Top Mattress
RRP £372.99
Rest Assured Knowlton 2000 Pocket Latex Pillow Top Mattress
RRP £851
Emma Helix Hybrid Deluxe Mattress
RRP £1,329
Silentnight Easyflex Gel 2000 Mirapocket Mattress
RRP £944.99
Millbrook Smooth Tech 5000 Pillow Top Mattress
RRP £1,470
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.
Why buy your double mattress from MattressOnline?
Buying a mattress online should be stress-free. Here's what you get with MattressOnline.
- 100 Nights to be sure: Sleep on your new double mattress for 100 nights. If it isn't right for you, our 100-Night Sleep Trial has you covered.
- Real expert help: Our Sleep Experts, led by our Head of Sleep Science, answer the questions a spec description can't.
- Awarded products, not just claims: We stock Which? Best Buy and Good Housekeeping award-winning mattresses from over 40 brands. We're also seven-time NBF Bed Retailer of the Year, so you can trust us with your sleep.
- Over 20 years, 72,000+ reviews: We've sold mattresses since 2003 and hold a 4.7 out of 5 Trustpilot rating.
- Delivered fast, hassle-free: Order by 4pm for free next day delivery to most of the UK. Add mattress recycling at checkout and we'll take your old one away. No stress.
Expert Tips: How firm should my double mattress be?
Our double mattresses come in every firmness level to suit your sleep style. Here’s what our Head of Sleep Science recommends:
- 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 100-Night Comfort Trial risk-free.
How much do double mattresses cost?
Double mattress prices vary based on brand and materials, but our Sleep Experts have selected 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
Our Sleep Experts 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 MattressOnline, 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
See what our customers say about us
Why buy from MattressOnline?
Free delivery to most locations
Free next working day delivery on most of our mattresses and beds, or upgrade to weekend delivery.
100-night mattress comfort trial
Test your mattress for 100 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: 09:30am - 5:30pm
Sunday: 10am - 4pm
Customer Service
Mon-Sat: 09:30am - 5:30pm
Sunday: Closed
customerservice@mattressonline.co.uk
