Mattress guide
Mattress buying checklist
Updated 13 September 2026 · 12 min read
A good decision is less about finding a universally ‘best’ mattress and more about gathering the right facts in a repeatable order. Use this checklist before a showroom visit or online purchase.
Quick answer
What you need to know
Write down your required size, usual sleep position, body-weight considerations, preferred feel and current mattress problems before looking at products. Compare construction and firmness separately, verify compatibility with your base, and calculate the total cost including delivery, collection, protector and any replacement base. Then read the trial, return and guarantee terms before paying—not afterwards. Test the mattress in your usual position and keep evidence of every material claim or retailer promise that matters to your decision. A discount should narrow the price, never override fit, access or return checks.
- Start with needs, not brands or discounts
- Compare the same size and specification
- Read trial and guarantee exclusions
- Calculate delivery, collection and bedding costs
1–5: define what the mattress must do
- 1
Confirm the exact size
Measure the frame internally and use the UK size guide.
- 2
Name your normal positions
Side, back, front or combination affects cushioning and support needs.
- 3
Record each sleeper’s needs
Include body weight guidance, preferred feel, movement sensitivity and temperature.
- 4
List current problems
Heat, sagging, pressure, edge collapse, noise and partner disturbance require different solutions.
- 5
Set a complete budget
Include base, protector, sheets, delivery, removal and possible return collection.
Do this before reading product pages. It prevents attractive labels from quietly changing the problem you are trying to solve. Separate essential requirements from preferences, and decide which trade-offs are acceptable.
6–10: interrogate the product specification
- 1
Identify the real construction
Read layer materials and depths; our type guide explains the trade-offs.
- 2
Interpret firmness cautiously
Manufacturer scales differ. Compare the original description with a normalised category where available.
- 3
Check depth, weight and handles
These affect bed height, access and safe rotation; handles may be for positioning only.
- 4
Read user-weight guidance
Check per-person and total limits, especially for shared or adjustable beds.
- 5
Verify base compatibility
Follow product-specific requirements; there is no universal slat-gap rule.
| Marketing phrase | What to ask instead |
|---|---|
| Orthopaedic | What construction or test supports the claim? |
| Cooling | Which layer or cover provides this, and how? |
| Natural | Which materials, in what proportion, and with what certification? |
| High spring count | Which spring layers are counted, and what are the upholstery layers? |
| Hotel quality | What measurable specification and guarantee does that describe? |
11–15: check the retailer terms
- 1
Read the home-trial conditions
Note start date, minimum nights, protector rules, exclusions, fees and refund versus exchange.
- 2
Read the returns policy
Online cancellation rights and a comfort trial are not the same thing, particularly once packaging is opened.
- 3
Understand the guarantee
Check duration, body-impression threshold, base requirements, proof needed and whether cover reduces over time.
- 4
Confirm delivery access and service
Room-of-choice, doorstep, assembly and packaging removal are different services.
- 5
Confirm old-mattress removal
Check charge, collection timing and hygiene requirements; do not assume the delivery crew will take it.
16–20: compare like for like and test
- 1
Match identifiers
Use brand, model, size, GTIN or MPN where available; retailer-exclusive names may hide similar constructions.
- 2
Strip out bundles
Value the mattress, base, pillows and protector separately rather than accepting the advertised bundle saving.
- 3
Compare delivered cost
Use the same size and include mandatory charges. Do not compare a Single headline price with your required King.
- 4
Test realistically
Lie in normal positions, turn, use the edge and test with your partner. A hand press is not a sleep test.
- 5
Pause before paying
Recheck your essentials, terms and measurements. A countdown should not make the decision for you.
The comparison tool helps align catalogue specifications. Demo prices remain clearly labelled and are not verified live prices, so confirm any final offer and terms with the retailer before buying.
Buying online versus in a showroom
A showroom gives you immediate access to several constructions and lets both sleepers test movement and edge support. Its weakness is time: a few minutes under bright lights is not a full night. Wear comfortable clothing, remove heavy outerwear, lie in your usual positions and revisit the leading option after trying others. Ask the adviser for the written specification and terms rather than relying on verbal descriptions.
Online buying can provide a wider range and a longer home trial, but read what ‘trial’ means. Some schemes require a minimum number of nights, an approved protector or an exchange rather than a refund. Collection may be charged, remote areas may be excluded and damaged or marked products may not qualify. Screenshot the terms and product specification on the order date.
| Route | Useful advantage | Main limitation | Good discipline |
|---|---|---|---|
| Showroom | Compare physical feels quickly | Short test and sales pressure | Retest the shortlist in normal positions |
| Online | Home trial and broad choice | Cannot feel before delivery | Read collection and refund terms first |
| Marketplace | May expose additional sellers | Matching and seller quality vary | Verify condition, identity, delivery and returns |
On delivery and during the trial
- Inspect packaging and the mattress promptly; photograph transit damage before use.
- Check the label matches the ordered model and size.
- Follow unrolling and ventilation instructions; allow the stated expansion time.
- Use the required protector without removing permanent labels.
- Keep a dated comfort diary and calendar reminder before the return deadline.
- Follow rotation and base instructions from day one.
Common questions
Frequently asked questions
Do I need to test a mattress in a shop?
A shop test can reject obvious mismatches, but a well-explained home trial offers more realistic evidence. Ideally use both where practical.
Is a longer guarantee proof of better quality?
Not by itself. Read what is covered, exclusions, measurement thresholds and whether the remedy or value changes over time.
Can I return an opened mattress?
It depends on the retailer’s terms and applicable consumer rights. A comfort trial is separate from statutory cancellation rights, so read the specific conditions before opening.
Should I buy a new base too?
Only when the current base is worn, incompatible or the manufacturer requires a particular system. Inspect it and obtain the compatibility requirement in writing.
Are customer reviews useful?
They can reveal recurring delivery or durability issues, but comfort is personal. Look for verified detail and patterns rather than star averages alone.
Sources and further reading
- Bed buyers’ guide — Bed Advice UK
- Shopping for a new bed — Bed Advice UK
What to do next
Put the checklist into practice
Compare the same mattresses side by side, then verify the final price and terms with the retailer.
Open comparison