Most people keep a mattress far longer than they should, simply because there's no obvious single moment that signals it's time to replace it. Here are the signs actually worth paying attention to.
Visible Sagging or Body Impressions
A permanent dip where you sleep, visible even when the mattress is unoccupied, means the internal support structure has broken down and cushioning alone won't fix it. This is one of the clearest, most objective signs it's time for a replacement.
Waking Up With New Aches
If you're waking up with back, hip, or shoulder discomfort that wasn't there before — and it eases once you're up and moving — your mattress may no longer be providing the support it once did, even if it looks fine on the surface.
Sleeping Better Away From Home
Consistently sleeping better in a hotel or at a friend's house than in your own bed is a strong, if easy to overlook, signal that your current mattress isn't doing its job anymore.
General Age Guidance
As a rough guide, most mattresses are worth reassessing after 7–8 years of regular use, though this varies significantly by construction quality and how much wear the mattress has actually seen. A mattress in a rarely-used guest room will last considerably longer than one used every night.
Increased Allergy Symptoms
Older mattresses accumulate dust mites and allergens over years of use, which can contribute to worsening allergy or asthma symptoms even with regular cleaning — worth considering if symptoms have crept up without an obvious other cause.
What to Do Once You've Decided
Rather than replacing like-for-like, use the opportunity to reassess whether your current construction and firmness still suit how you sleep now — see our guides on memory foam vs pocket sprung and firmness by sleep position.
Browse our full Mattresses range across all standard UK sizes.