The practical answer
Specify the mattress in millimetres and obtain the bed maker’s drawing of the internal opening, support height, headboard and outer footprint. Ask the mattress manufacturer to confirm the permitted support system and any dimensional variation. Approve those two products together, then coordinate bedside tables, sockets and bedding. If buying the mattress locally and the frame from China, make the local mattress specification an input to the Chinese supplier’s final drawing rather than relying on the word queen or king.
Replace size names with measured product identities
Write the exact mattress brand, model, width, length and thickness into the bed brief. If that selection is not yet final, identify the decision as unresolved instead of letting the frame supplier guess. List measurement units on every drawing. A rounded conversion between inches and centimetres can introduce confusion when different participants copy numbers into quotations.
TEMPUR Australia’s size guide publishes dimensions for its named mattress sizes and separately discusses adjustable-bed sizes. The useful lesson is to consult the actual market and product guide. Do not apply one country’s label to every mattress sold under a similar name elsewhere. Ask for the selected model’s current technical information, including any stated size variation, and make that document part of the purchasing record.
Request three different sets of bed dimensions
The first set describes the mattress opening. The second describes the support platform, including its position within the frame. The third describes the external bed: headboard, side rails, footboard and protruding feet. These dimensions answer different questions. A frame may accept the mattress but still occupy too much room because of upholstered wings or a thick footboard.
Ask how much clearance the maker proposes around the mattress and why. The correct allowance depends on the product design, upholstery and mattress specification; do not invent a universal gap. Review a section drawing showing the mattress in place, with its top surface and any exposed side. This makes it possible to judge the visible headboard height, how bedding will tuck in and whether the mattress sits unexpectedly deep inside the frame.
Coordinate support and moving mechanisms explicitly
The mattress manufacturer should identify acceptable support arrangements for its model. Send that information to the bed supplier and ask for a written compatibility response. Confirm the number, spacing and arrangement of supports against the selected manufacturer’s requirements rather than assuming that any slatted base is suitable. Request the relevant product instructions, not a generic reassurance that the frame fits all mattresses.
For storage beds, obtain the mechanism instructions and the mattress-weight range specified by the mechanism or bed manufacturer. For adjustable bases, review the actual moving envelope and access to motors, cables and controls. Ask whether decorative side rails obstruct movement. A static drawing with the bed flat does not show these interactions. Any electrical work or structural alteration should be handled by the appropriate qualified local professional.
Separate mattress sourcing from health claims
A furniture package may include a mattress described with comfort or wellness language. Request construction, dimensions and product-specific evidence instead of treating those words as a clinical promise. If the mattress is being imported, the buyer and supplier must also establish which requirements apply in the destination market and who provides the necessary documentation.
For the United States, CPSC’s mattress guidance explains relevant flammability requirements, testing and records. That is a jurisdiction-specific starting point, not a statement that any quoted mattress complies. Ask the responsible importer to review the exact product and documentation. A photograph of a label or a report for a different mattress does not resolve the specification and compliance questions for this order.
Use a bedroom interface schedule
The bed should appear on the same coordinated plan as bedside tables, wardrobes, curtain clearances and outlets. Include the finished mattress height when reviewing bedside-table height; the top of the empty frame is not the sleeping surface. Confirm whether lamps and chargers need access behind a headboard before that space becomes inaccessible.
| Interface | Required information | Who confirms it |
|---|---|---|
| Mattress to opening | Exact model dimensions and proposed allowance | Mattress source and bed maker |
| Mattress to support | Permitted base and support details | Mattress manufacturer |
| Frame to room | Full outer footprint and moving envelope | Room planner |
| Headboard to services | Socket and cable-access locations | Local installer |
| Delivery to bedroom | Largest component and assembly sequence | Delivery and assembly team |
Require an updated schedule when any of these inputs changes after quotation.
Illustrative example: a locally purchased mattress
A buyer orders a custom upholstered bed from China but plans to buy the mattress in Australia. The initial quotation says king bed. Before production, the buyer selects a specific local mattress and sends its current dimension sheet to the bed supplier. The supplier returns a section showing the opening, support and final mattress height.
The drawing reveals that the chosen thick mattress would hide much of the decorative headboard and place the sleeping surface well above the proposed bedside tables. The buyer can now revise the support level, headboard or tables as a coordinated decision. It also checks that the headboard can pass through the stairwell in its packed form. No measurement in this example is a universal rule; the benefit comes from replacing an ambiguous label with a verified set of compatible parts.
Judge the supplier by its ability to close the interfaces
A search for Recommended whole-home furniture suppliers in China often leads to bedroom collections presented as complete sets. A set still needs compatibility checks. Ask whether the supplier coordinates frame, mattress, base and bedside dimensions, and who signs the final drawing when one item comes from a different source.
If Mlissia Casa is shortlisted, send the actual mattress specification and request a matching bed section, assembly plan and packing dimensions. Avoid approving a bespoke frame while the mattress remains undecided. Retain the model details, drawing revision and support requirements together. This makes future replacement easier because a new mattress can be evaluated against a documented opening and support system instead of an old order described only as a king-size bed.
Evidence trail
Sources and scope
- TEMPUR Australia — Mattress and bed size guidePublished market-specific dimensions and adjustable-size distinctions.
- CPSC — Mattresses, mattress pads and mattress setsUS-specific mattress flammability and documentation guidance.
Sources checked 15 October 2026. Supplier pages describe their own offerings. Worked examples are illustrative unless explicitly attributed. Read our editorial method and disclosure.