How to Measure Your Bedroom for a Bed: UK Size & Fit Guide

Buying the right bed starts with knowing whether the complete frame will fit your bedroom and whether the room will still work once it is in place.

To measure your bedroom for a bed properly, check the usable floor space, the full external dimensions of the bed frame, the space needed for furniture and movement, and the complete delivery route into the room.

The key is not simply asking, “Will the mattress fit?” A mattress measurement tells you the sleeping area. Upholstered side rails, headboard wings, footboards, storage mechanisms and TV housings can make the actual bed wider or longer.

This guide takes you through the measurements worth checking before you order.

What Should You Measure Before Buying a Bed?

Before comparing bed sizes, take measurements in four areas:

• The bedroom itself: usable width, length and any restricted areas.
• The complete bed frame: not only the mattress.
• The space around the bed: furniture, doors and walking routes.
• The delivery route: doors, hallways, stairs, landings and lifts where relevant.

A bed can fit neatly on a floor plan yet still be impractical if a wardrobe cannot open, a radiator becomes blocked or a large headboard cannot turn around the staircase.

A tape measure, a simple room sketch and some masking tape are usually enough to spot these problems before ordering.

Step 1: Measure Your Usable Bedroom Space

Start by measuring the bedroom’s length and width at floor level.

Do not stop at the wall-to-wall measurements. Record anything that reduces the space you can actually use, including:

• Alcoves
• Chimney breasts
• Boxed-in pipes
• Fitted wardrobes
• Radiators
• Low window sills
• Sloping ceilings
• Door openings
• Permanent furniture

If the room is not perfectly square, measure it in more than one place. Older properties can have walls that narrow slightly from one end of the room to the other.

Sketch the room as a simple floor plan and write each measurement beside the relevant wall. Mark doors, windows, radiators and fitted furniture on the same drawing.

Measure Where the Bed Will Actually Sit

Next, measure the wall where you expect the headboard to go. A room may be wide overall but offer much less usable wall space once a radiator, door or fitted wardrobe is taken into account.

Also check the direction in which the bedroom door opens. The bed should not prevent the door from opening normally or create an awkward route into the room.

 

Step 2: Check the Mattress Size and the Full Bed Frame

One of the most important measurements in bed buying is also one of the easiest to misunderstand: mattress dimensions and bed-frame dimensions are not necessarily the same.

Standard UK mattress dimensions describe the sleeping surface. The complete bed can be larger because of its construction.

An upholstered frame may add space through:

• Padded side rails
• Upholstery thickness
• A substantial headboard
• Winged headboard sections
• A footboard
• Structural framing
• An ottoman base
• A TV lift housing

This matters most with upholstered and statement beds. A 150 × 200 cm king mattress, for example, can sit inside a frame that is wider and longer than those mattress figures.

Always use the external width, total length and headboard measurements shown on the individual Deeplay product page when deciding whether a specific bed will fit.

 

UK Bed Sizes: Quick Measurement Reference

Use these standard UK mattress dimensions as a starting point for room planning:

 

If you need to compare the full UK size range in more detail, use our Complete UK Bed Sizes Guide rather than relying on mattress measurements from international websites.

If you are working with a particularly compact room, the Small Double Bed Size Guide explains how a 4ft mattress differs from a standard double and where that smaller footprint can be useful.

Remember that the table above gives mattress dimensions only. External bed-frame dimensions vary by design.

Step 3: Leave Enough Space Around the Bed

A bed fitting between two walls does not necessarily mean the room has enough usable space for it.

You need to be able to get in and out of bed, make the bedding, reach nearby furniture and move through the room.

As a practical planning target, around 60 cm or more of clear space on frequently used sides can make movement easier where the room allows it. Treat this as guidance rather than a fixed rule. A compact room may work with less on one side if that side is rarely used.

Check the distance between the bed and:

• Bedside tables
• Wardrobes
• Chests of drawers
• Bedroom walls
• The bedroom door
• Furniture at the foot of the bed

Do not measure only the gap when furniture is closed. Measure how much space it needs when being used. A walkway can look acceptable on a floor plan but become useless if a wardrobe door opens into it.

Step 4: Check Your Wardrobes, Drawers and Other Furniture

One of the most common room-planning mistakes is checking whether the bed fits without checking whether everything else still works.

Wardrobes

Open the wardrobe fully and measure how far the doors project into the room. Sliding wardrobes need less opening space than hinged doors, but you still need enough room to stand in front of them.

Chests of Drawers

Measure the depth of the furniture and the additional space required when a drawer is fully open. A bed placed too close can make the lower drawers difficult or impossible to use.

Bedside Tables

Decide whether you want one or two. If you move from a double to a king, the wider bed can push bedside furniture closer to the walls.

Radiators

Include radiators in the usable layout rather than treating the wall behind them as free space. Consider access and whether the bed or headboard would sit directly in front of one.

Windows

Check the height and position of the sill, especially if the headboard may sit beneath a window. Make sure curtains, blinds and opening windows can still be used normally.

Sockets and Switches

Mark plug sockets and switches on your floor plan so they do not end up hidden behind a large headboard or difficult to reach.

The better question is not “Can I squeeze the bed into the room?” but “Can I still use the bedroom normally once the bed is there?”

Step 5: Measure for the Headboard

The mattress is rarely the widest or tallest part of a statement bed.

This matters particularly with:

• Wingback beds
• High-headboard beds
• Oversized headboards
• Ambassador-style beds
• Heavily upholstered frames

A winged headboard may extend beyond the width of the mattress and side rails. A 150 cm king mattress therefore does not automatically need only 150 cm of wall width.

Check the headboard width listed for the actual product, then measure vertically as well.

A tall headboard can interact with:

• Sloping ceilings
• Low ceilings
• Windows
• Picture rails
• Dado rails
• Wall lights
• Switches
• Wall-mounted televisions
• Shelves

A large headboard can also make a room feel fuller even if the frame physically fits. Physical fit and visual scale are two different decisions.

 

Step 6: Measure for an Ottoman Bed

An ottoman bed needs to fit the room both closed and in use.

Before choosing from Ottoman Beds, check:

• The complete external width and length
• Where the bed will sit in the room
• How the ottoman opens
• Where you need to stand while opening it
• Whether nearby furniture restricts access
• Whether the storage remains practical once the bedroom is furnished

Do not assume every ottoman opens in the same direction. Opening methods vary by design, so check the individual product details before ordering.

The important distinction is between the bed fitting and the storage being convenient to use. If the frame technically opens but a bedside table, wall or other furniture makes access awkward, the layout may need changing.

Step 7: Measure for a TV Bed

TV beds need extra attention because the footboard contains the television housing and lift mechanism.

When comparing TV Beds, check:

• The total external frame length
• Footboard depth
• Walking space at the foot of the bed
• Nearby drawers or wardrobes
• Room circulation
• Socket position
• Viewing layout

Do not estimate a TV bed from the mattress size alone. The footboard can make the complete frame longer, and exact dimensions and TV compatibility vary by model.

Use the individual product page as your reference for the exact frame measurements before ordering.

Step 8: Measure Your Delivery Route

Do not stop measuring at the bedroom door. A bed that fits perfectly once assembled can still cause delivery problems if the largest components cannot reach the room.

Walk from the entrance of your home to the exact position where the bed will be installed. Check the narrowest and most awkward points along the route.

Front Door

Measure the clear opening width and height, not simply the outside dimensions of the frame.

Hallways

Measure the narrowest section and look for radiators, shelving or furniture that reduces turning space.

Staircases

Check stair width, handrails, low ceilings, changes in direction, half-landings and the space available to rotate a large component.

Landings

Think about the length and width of a large headboard as it turns. A landing can be wide enough to stand on but still too tight to manoeuvre a large component.

Lifts

If delivery involves a lift, measure the door opening plus the interior width, depth and height.

Bedroom Doorway

Measure the opening into the room and the turning space immediately outside and inside it.

Some beds use split or multi-part components, but this varies by design. Do not assume a particular bed arrives in a certain number of pieces unless the product information confirms it.

Will a Double, King or Super King Fit in My Bedroom?

Start with the mattress dimensions, then test the external measurements of the actual frame against your room.

A Double May Make More Sense If:

• The room has limited floor space
• Wardrobe access is already tight
• You need larger bedside tables
• A king would reduce your main walking route
• You are choosing a particularly wide statement headboard

A standard UK double mattress measures 135 × 190 cm. If that size gives you the best balance between sleeping space and room usability, compare the external measurements within Deeplay’s Double Beds collection.

A King May Make More Sense If:

• Two adults use the bed regularly
• The room can take the larger footprint comfortably
• The extra mattress length is useful
• Furniture and walking routes still work once the larger frame is marked out

A standard UK king mattress measures 150 × 200 cm.

If both sizes fit, our Double Bed vs King Size Bed guide explains the practical difference in sleeping space and room footprint before you compare King Size Beds.

A Super King May Make More Sense If:

• The room has generous usable width
• The bed will not restrict wardrobes or other furniture
• There is enough circulation space around the frame
• The delivery route can accommodate the larger components

A standard UK super king mattress measures 180 × 200 cm.

If your measurements leave enough practical space, compare the actual frame dimensions in Deeplay’s Super King Beds collection.

Do not choose the largest bed simply because its mattress dimensions fit between the walls. Choose the largest bed that still allows the whole bedroom to function well.

Common Bed Measuring Mistakes to Avoid

Measuring Only the Mattress

The frame may be wider and longer because of the upholstery, side rails, headboard or footboard.

Assuming Every Bed of the Same Size Has the Same Footprint

Two king beds can both take a 150 × 200 cm mattress while having different external dimensions. Compare the specific models.

Forgetting the Headboard Width

A wingback or oversized headboard may need much more wall space than the mattress.

Ignoring the Footboard

A substantial upholstered footboard or TV housing can add length to the bed.

Measuring Wall to Wall Instead of Usable Space

Radiators, fitted wardrobes and doors may make part of the room unsuitable for the bed.

Forgetting Wardrobe and Drawer Openings

Measure furniture when it is open, not only when closed.

Ignoring the Bedroom Door

Make sure the door can open properly after the new bed is installed.

Forgetting Ottoman Operation

An ottoman may fit neatly while closed but be awkward to use if surrounding furniture is too close.

Ignoring Delivery Access

Measure the route through the property, including stairs and turns, before delivery day.

Buying From the Size Name Alone

Double, king and super king identify the mattress size. They do not guarantee identical external frame dimensions across different designs.

Bedroom Measuring Checklist Before You Order

Before placing your order, check that you have measured:

• Room length and width
• Usable wall width
• Bed-frame width
• Complete bed-frame length
• Headboard width and height
• Footboard projection
• Space beside the bed
• Space at the foot of the bed
• Bedside-table positions
• Wardrobe-door opening
• Drawer-opening space
• Bedroom-door swing
• Radiators
• Windows
• Sockets and switches
• Sloping ceilings or alcoves
• Ottoman opening and access, where applicable
• TV-bed footboard space, where applicable
• Front-door opening
• Hallway width
• Staircase width and turns
• Landing space
• Lift dimensions, where applicable
• Bedroom-door opening

Then compare those measurements with the exact dimensions listed on the individual Deeplay product page.

If you have not yet decided which mattress size is suitable, the Complete UK Bed Size Guide is the best place to compare standard UK mattress dimensions before returning to your room plan.

Before checkout, also review the current terms of Deeplay’s 30-day trial and 2-year warranty so you know what applies to your chosen bed.

Frequently Asked Questions

Should I measure the mattress or the full bed frame?

Measure the full external bed frame when deciding whether a bed will fit your bedroom. Mattress dimensions tell you the sleeping area, while the headboard, side rails, upholstery and footboard can make the complete frame wider or longer.

How much room should I leave around my bed?

Around 60 cm or more on frequently used sides is a useful planning target where space allows, but it is not a fixed rule. The main test is whether you can walk around the bed and use nearby wardrobes, drawers and doors comfortably.

Can a king size bed fit in a small bedroom?

Possibly. A UK king mattress measures 150 × 200 cm, but the complete frame will usually need more space. Mark the actual frame footprint on the floor and check what remains for furniture and movement.

How do I measure for a wingback bed?

Measure the external width and height of the full headboard as well as the frame length. Wingback headboards can extend beyond the mattress width, so check the wall space, nearby switches, windows and furniture.

Does an ottoman bed need extra clearance?

An ottoman bed needs enough space for you to operate the lift and access the storage comfortably. Exact requirements vary by opening design, so check the specific bed rather than relying on one universal clearance figure.

What measurements should I take for bed delivery?

Measure the front door, hallways, staircase, tight turns, landings, lift if applicable, bedroom doorway and any low ceiling points on the route. Pay particular attention to places where a large headboard or long component needs to turn.

How can I check whether a super king bed will fit?

A UK super king mattress measures 180 × 200 cm, but you should plan with the external dimensions of the chosen frame. Tape that footprint onto the floor and test wardrobes, drawers, doors and walking routes before deciding.

How much bigger is a bed frame than the mattress?

There is no standard allowance. The difference depends on the design. A slim frame may add little, while a padded upholstered frame, winged headboard or large TV footboard can add substantially more width or length.

How do I know what bed size my bedroom can take?

Measure the usable room first, then compare it with the external dimensions of specific bed frames. The right size is the largest option that still lets you use your doors, storage furniture, bedside area and normal walking routes comfortably.