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cs@factoryfast.com.auDouble and Single Mattress Buyer Guide: Which Size Suits Your Room and Sleeper?
Choosing between a double and single mattress is not simply a question of buying the largest option that fits through the door. The right choice depends on who will use the bed, how much usable floor space the room provides, whether the mattress matches the bed frame and which construction delivers the desired balance of comfort and support.
A single mattress usually makes sense when conserving space is the priority. A double gives one sleeper more freedom to change position and can accommodate two people when room dimensions are limited, although it may feel compact for long-term sharing. This guide works through those trade-offs so you can choose a mattress that fits both the sleeper and the room.
Double vs single mattress: the quick decision
Start with the sleeper rather than the product description.
Choose a single mattress when the bed is for one child, teenager, compact guest room or adult who does not need much lateral sleeping space. It leaves more room for a desk, drawers, wardrobe access or a wider walkway.
Choose a double mattress when one adult wants more room to stretch, the bed will regularly accommodate an overnight guest or two people need to share in a bedroom that cannot comfortably take a larger size. A double is also useful when a child’s room is being furnished with longer-term use in mind, provided the larger footprint does not compromise the rest of the layout.
The less obvious question is whether extra mattress width will improve the room or simply make it harder to use. A bed that blocks drawers, narrows the path to the wardrobe or forces a bedside table against a doorway can make the bedroom feel cramped every day.
Compare the actual mattress dimensions
Factory Fast product pages show approximately 92 x 187 cm for current single models and approximately 137 x 187 cm for a current double model. These product-level dimensions are more useful than relying on a size name alone.
That difference gives a double mattress about 45 cm of additional width while retaining a similar length. For one sleeper, the extra width can make turning and changing position easier. For two sleepers, however, that width must be shared.
Why the size label is only the first check
Mattress and frame dimensions can vary slightly between designs. A product listed as “single” should not automatically be assumed to fit every single frame already in the home. The same caution applies to double products.
Measure the internal mattress area of the frame, not its outside edges. The external dimensions include side rails, upholstery, posts or other structural elements that do not support the mattress. Compare the internal width and length with the dimensions on the exact mattress page.
Also check whether the frame has a recessed platform. A mattress that is slightly too wide may bow against the rails, while one that is too narrow can shift and leave uncomfortable gaps.
Account for the complete bed footprint
The mattress is only part of the floor-space calculation. A double bed frame may extend beyond the mattress on every side, particularly when it includes an upholstered headboard, footboard or wide rails.
Measure the selected frame as well as the mattress. Then allow space for doors, drawers, wardrobes and normal movement around the bed. If the room only accommodates a double when every other item is squeezed against a wall, a single may produce the more functional bedroom.
Decide how the bed will be used
The best size changes according to how often the mattress will be occupied and how long the sleeper is expected to use it.
Children’s rooms
A single mattress is often the practical choice for a child because it preserves play space and leaves room for other furniture. It also makes bedding easier to handle and can suit compact bed bases, bunks or daybeds when the exact dimensions match.
A double can be worth considering when the room is generous and the bed is intended to remain suitable as the child grows. The trade-off is that a larger mattress uses floor space that might otherwise accommodate study or storage furniture.
Teenagers and individual adults
A single can still work well for a sleeper who remains mostly in one position and values bedroom space over bed width. Taller shoppers should pay close attention to mattress length, however. Moving to a double generally adds width rather than extra length.
For an individual adult who turns frequently or dislikes sleeping close to the edge, a double can offer a noticeable comfort advantage. Browse current double mattresses by construction and thickness after confirming the room can accept the larger frame.
Guest bedrooms
The expected guests should guide the choice. A single is efficient for occasional solo visitors and allows a small room to retain another purpose between stays. Current single mattresses include foam, spring and hybrid options for different comfort preferences.
A double makes the guest room more flexible for couples or individual visitors who prefer extra width. Before upsizing, check whether guests will still have somewhere to place luggage and move around the bed.
Regularly shared beds
A double can accommodate two people, but it provides considerably less individual width than each person receives in separate single beds. It is most suitable when room size prevents a larger option or when both sleepers are comfortable with close sleeping.
Movement transfer, edge use and temperature preferences become more important when two people share. Construction may therefore matter as much as size. A wider mattress will not resolve discomfort if its feel or response does not suit either sleeper.
Choose the mattress construction
Once the size is settled, compare how the mattress is built. Foam, spring and hybrid designs respond differently to pressure, movement and heat.
Memory foam
Memory foam compresses around the body and produces a more contoured feel. This can suit sleepers who prefer less surface bounce or who want movement on one side of the bed to feel less noticeable on the other.
Foam density, layer depth and the support core all affect how the mattress performs. A thin comfort layer over a substantial support base will feel different from a design with several deep contouring layers.
The currently available single gel memory foam mattress demonstrates this layered approach. It measures approximately 92 x 187 cm and 25 cm high, with a 4.3 cm ventilated gel memory foam layer above a 21 cm high-density foam base. Its listed medium-firm feel may suit shoppers wanting surface contouring without an especially soft overall response.
Spring mattresses
Spring mattresses provide a more responsive surface. They can suit sleepers who prefer easier movement, a familiar bed feel and airflow through the support structure.
Spring type and the comfort materials above it matter. A basic connected spring system responds across a broader area, while individually encased springs can react more independently. The amount of foam or quilting over the springs determines whether the sleeper feels a firmer response or a cushioned top.
A current double spring mattress measures approximately 137 x 187 cm. Its spring support system is paired with comfort foam and a quilted knitted cover, making it a useful example for shoppers who want a responsive double rather than a deeply conforming all-foam design.
Hybrid mattresses
Hybrid designs combine a spring support system with substantial foam comfort layers. They are worth considering when a shopper wants the response of springs with more contouring at the surface.
Do not assume every mattress marketed as a hybrid feels the same. Compare the height and type of each comfort layer, the coil construction and the stated firmness. A hybrid with a shallow quilted layer may feel closer to a traditional spring model, while deeper memory foam can create a more enveloping surface.
Match firmness to the sleeper
Firmness describes the initial feel of the mattress, but it does not tell the complete story. Body weight, sleeping position and layer construction affect how deeply a person settles into the surface.
Side sleepers
Side sleepers generally place more concentrated pressure through the shoulder and hip. They often prefer enough surface cushioning to accommodate these areas without feeling as though the body is resting directly on the support core.
A mattress can still feel supportive while providing this cushioning. Look at the comfort-layer depth and material rather than choosing solely from a soft, medium or firm label.
Back sleepers
Back sleepers often prefer a balanced surface that supports the middle of the body without allowing the hips to settle much farther than the upper torso. Medium and medium-firm options can provide a useful starting point, but personal feel remains important.
A responsive spring or hybrid may suit someone who changes position during the night. A foam design may appeal to a sleeper who prefers a steadier, more contoured surface.
Front sleepers
Front sleepers commonly look for a more supportive feel that limits excessive sinking through the centre of the body. Deep, very soft comfort layers may feel less stable for this use.
Mattress thickness should not be confused with firmness. A 30 cm product is not automatically firmer than a 20 cm product; the materials and arrangement of its layers determine how it responds.
Couples with different preferences
A double mattress has one shared sleep surface, so large differences in firmness preference can be difficult to reconcile. Focus on a broadly comfortable middle ground and consider how much each sleeper moves.
When one person prefers contouring and the other values easier movement, a balanced hybrid or cushioned spring design may be worth comparing. Read the construction details rather than relying on broad comfort language.
Check mattress height and bed-frame compatibility
Width and length determine whether the mattress fits inside the frame. Height affects how the completed bed functions.
A deeper mattress raises the sitting and sleeping surface. This can make getting into bed easier for some adults, but it may cover more of a decorative headboard or make a compact bed visually dominant. On a tall frame, a thick mattress can create a much higher overall bed than expected.
Inspect the support surface
Check whether the base uses timber slats, steel slats or a solid platform. Review the mattress and frame instructions for any stated support requirements.
Slats should be secure, level and capable of supporting the selected mattress. A damaged or sagging base can change how a new mattress feels. Replacing the mattress without inspecting the frame may therefore leave the original problem unresolved.
Consider edge position
A mattress sitting inside raised side rails may be harder to rotate or fit with sheets if the recess is deep. Conversely, a very tall mattress placed on shallow rails can sit well above the frame and reduce the visual impact of the headboard.
For children’s furniture or any frame with surrounding rails, compare mattress depth with the specific frame design before ordering. Do not assume that a thicker mattress is automatically the better match.
Confirm wall-bed and adjustable-frame limits separately
Specialised frames may specify maximum mattress depth, dimensions or weight. A mattress can match the nominal bed size yet still be unsuitable for the mechanism.
Treat these limits as part of the fit calculation. Check the exact mattress weight and depth against the exact frame page rather than generalising from another model of the same size.
Measure the bedroom before choosing a size
A simple floor plan can prevent an expensive sizing mistake. Measure the room at floor level and record fixed features such as doors, built-in wardrobes, windows and power points.
Mark the external bed-frame dimensions on the floor with removable tape. Open the room door and every nearby drawer or wardrobe door. Walk the route from the entrance to both sides of the bed.
Test the double-bed footprint
A double is a better purchase when the taped outline leaves practical access to storage and enough room to change the bedding. It is a poorer fit when the extra width blocks furniture or creates a narrow passage that will be frustrating every day.
Pay particular attention to bedside furniture. A double may technically fit but leave no usable space for a lamp, phone or glass of water.
Test the single-bed layout
A single often creates more layout options. It may allow the bed to sit beside rather than beneath a window, preserve space for a study area or provide better access to drawers.
Use that reclaimed floor area intentionally. If the smaller bed only creates unused space, the wider sleeping surface of a double may deliver more value to the sleeper.
Compare delivery and setup requirements
Mattresses are bulky even when supplied compressed. Measure the route from the property entrance to the bedroom, including stairs, corners and narrow doorways.
Check the product page to see how the mattress is packaged. A compressed mattress may be easier to move before opening, but it can become difficult to reposition once it starts expanding. Move it into the correct room first and follow the supplied expansion guidance.
Larger mattresses are also harder for one person to rotate or move. If the bed will be rearranged frequently, handling weight and room access should be included in the decision.
Avoid the most common buying mistakes
The first mistake is choosing by size name without comparing exact measurements. Record the mattress dimensions, internal frame dimensions and external bed footprint separately.
The second is assuming that a double is automatically suitable for every couple. Consider individual width, movement and long-term use rather than whether two people can simply fit.
The third is treating thickness as a measure of quality or firmness. Study the layer structure and support system to understand what the extra depth actually provides.
The fourth is replacing an uncomfortable mattress without checking the base. Loose, uneven or unsuitable support can affect the performance of the new product.
The fifth is overlooking the complete room layout. Test doors, drawers, walking paths and bedding access before committing to the larger option.
Finally, compare the finished bed with the bedding already in the home. Mattress depth affects fitted-sheet sizing, the visible height of the headboard and the position of bedside furniture. Checking those three details immediately before checkout can prevent a technically compatible mattress from becoming an awkward everyday setup.
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