How often should you change your mattress?

Replacing your mattress at the right time is crucial for your health as an old mattress can harshly impact your quality of sleep. Having a lack of deep sleep can lead to a lot of issues both physically and mentally which is why replacing the mattress should be done promptly when it reaches the end of its life-span. With a new mattress you can receive an array of great benefits such as improved sleep, less allergic reactions and more.

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Here at Custom Size Beds, we provide high quality mattresses that provide a good night’s sleep for many years. We have endless options when it comes to sizing as we offer bespoke mattresses that fit your particular needs. Check out our Design a Mattress tool so you can finally get a mattress made just for you.

What is the lifespan of a mattress?

From day one, a mattress starts deteriorating. Every night slept on your new mattress subjects it to wear and tear. In turn this softens and compresses the fillings inside your mattress and with time they gradually lose their ‘bounce’ or support. Because the process is so slow, it’s often tricky to know exactly when your mattress has reached the end of its lifespan and is no longer working as well as it once did.

Usually, mattresses need replacing every 5 – 8 years. But there are a number of factors to consider such as body weight, the material of the mattress and so on which can increase or decrease its lifespan.

There are major benefits to changing your mattress, for example, you will suffer less from allergic reactions. Old mattresses can attract large amounts of dust and other particles which can be particularly irritating for people who have hay fever and dust allergies. Replacing your mattress can lead to decreased pain. For example, the material of your mattress can affect your natural spinal alignment which is why it’s best to opt for a memory foam that moulds around your body shape.

Check out our article “How Long Does A Mattress Last?” for a more in-depth look into why mattresses last as long as they do and what you can do to prolong their life span.

What are the signs your mattress needs to be replaced?

An old mattress can result in poorer sleep quality and it’s important to note that as you get older your body’s needs change so your mattress should reflect this.

Having an old mattress that needs replacing can be detrimental to your physical health. So, it’s best to know what the signs are when your mattress has reached the end of its lifespan. Signs can include:

  • Poor Sleep – lack of deep sleep can make people feel less well-rested even after a long time asleep.

  • Allergies – dust and hay fever sufferers could have more intense and frequent reactions if they sleep on an older mattress

  • Back pain – lack of support from your mattress can lead to back pain due to your spine not being naturally aligned while you sleep.

  • General wear and tear – this occurs overtime as you sleep on it every night

  • Aches / Feeling uncomfortable – if you wake up feeling sore and aching then it’s most likely you’re experiencing a lack of support caused by an old mattress

  • Bumps and dips in the mattress – even though mattresses will soften with gradual use, more extreme bumps and dips can severely affect your sleep quality

  • Bed bugs – bed bugs can be a serious hassle and if not dealt with properly could seriously damage your mattress

What to look for in a new mattress

So, what should you look for in a new mattress? It should be one that suits your personal needs. For a more detailed explanation, consider reading our article on how to choose a new mattress. Here’s a quick overview of what you should consider when looking for a new mattress:

  • The thickness of a mattress can affect the amount of support and comfort it can offer. Generally the thicker the mattress, the better

  • Since this is a big investment, your mattress should come from a reputable company that also offers a manufacturer’s warranty. Here at Custom Size Beds we offer a 5-year warranty with all our mattresses and have been serving happy customers since 2013! We’re confident we’ve perfected the art of satisfaction, but don’t just take our word for it, click here to read our reviews

  • Material is an important factor to consider as the type of foam you choose can make the mattress distribute your weight differently. Check out our foam options here at Custom Size Beds.

  • Personal preference is very important when selecting a new mattress as everyone has their own way of sleeping. Selecting a firmness option can be down to what you prefer, and a firmer mattress will always offer a lot more support, whilst a medium mattress will provide a lot more ‘give’

  • We recommend getting some expert advice. So contact us today to speak with one of our experts and get personalised information!

For a more in-depth explanation of what to look for in a new mattress, you can read our Knowledge Hub.


  • When do you replace your mattress?

    When the signs of wear tear are visible and negatively affect your sleep quality, which is usually every 5-8 years.

  • How do I know if my mattress is worn out?

    The most obvious signs of an old mattress are visible that cause back pain, a severe lack of support, bed bugs, and more.

  • What is the average lifespan of a mattress?

    Between 5-8 years.

  • What happens to a mattress after 10 years?

    The mattress deteriorates and could lead to bed bugs, dust, the material no longer functioning and a significant lack of support

  • How do I know if my mattress is causing me pain?

    If you wake up feeling sore and your back is aching, then your mattress most likely has a lack of support and is not holding your body shape correctly.


Knowing how often you should replace your mattress is very important so you can always get the best night’s sleep. If you are looking for a replacement mattress then we have you covered at Custom Size Beds. We have a wide range of mattresses that can be cut to any size you desire so you can place it anywhere you see fit. Design your own mattress today with Custom Size Beds!

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Start by selecting the shape that shows the closest match to your requirements – you’ll be able to customise this later. If you can’t find your shape or need something entirely different, get in touch and we’ll be more than happy to help.

Step 1) Select the shape you wish to customise
Basic shapes
Shaped mattresses
You’ll select which side the shape is cut later
Split mattresses
You’ll select the position of the split later