Double Mattresses

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 100-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.