The Complete Guide to Buying a King Size Bed Online

Buying a King Size Bed Online: The Short Answer

A king size bed in the UK measures 150cm wide by 200cm long, which is 5ft by 6ft 6in. To buy one online with confidence you need four numbers before anything else: the width of your room, the length of your room, the external footprint of the frame including any headboard depth, and the width of the narrowest doorway or stair turn the parts must travel through. Get those four right and the rest of the decision becomes a question of material, storage and style rather than risk.

Most returns and disappointments come from one of two things: a room that cannot take the frame comfortably once walking space is accounted for, or a frame that arrives in boxes larger than the hallway can handle. Both are avoidable in ten minutes with a tape measure. Once you have cleared those hurdles, buying online gives you a far wider choice of sizes, finishes and fabrics than most high street showrooms can hold at once.

Understand UK King Size Measurements Properly

UK bed sizes are standardised, but the frame around the mattress is not. Two king size beds can take exactly the same 150cm by 200cm mattress and still differ by 20cm in external width, because side rails, upholstery thickness and moulded timber all add bulk. Always read the external dimensions on the product page rather than assuming the mattress size tells you the footprint.

As a working rule, expect a king size frame to occupy somewhere between 158cm and 175cm across, and between 205cm and 225cm from the back of the headboard to the end of the footboard. Sleigh designs and winged upholstered designs sit at the larger end of that range. Slim platform frames sit at the smaller end.

Then add circulation space. You want at least 60cm to walk down each side you plan to use, and around 75cm at the foot if you need to pass in front of a wardrobe. If those margins leave you squeezed, a small double or standard double may serve the room better than forcing the larger size in.

Choose the Frame Material That Suits the Room

Material affects how heavy the bed feels visually, how it behaves over time and how much upkeep it needs.

Upholstered frames soften a room and absorb sound, which suits bedrooms with hard floors or high ceilings. Linen blends and chenille weaves look calm and hold their shape well. Velvet reads richer and reflects light, so it works in rooms where you want depth rather than airiness. Our range of modern king size fabric beds UK sale covers both quiet neutrals and deeper tones for anyone leaning towards colour.

Timber frames bring grain, warmth and a sense of permanence. Solid oak and acacia age gracefully, while engineered timber with a real wood veneer keeps weight and cost down. Timber also suits rooms that already carry a lot of fabric in curtains and rugs, because it stops the scheme feeling soft on every surface. If that direction appeals, browse the king size wooden beds UK and compare grain tones against your flooring before choosing.

Leather and faux leather sit somewhere between the two. They wipe clean easily, which matters in households with pets, and they give a sharper outline than fabric. Metal frames remain the lightest option visually and are worth considering in smaller rooms where a solid block of colour would dominate.

Slats, Support and Mattress Compatibility

Support is the part of a bed people research least and notice most. Sprung slats flex slightly under load and add a gentle cushioning effect. Solid or rigid slats give a firmer overall feel. Neither is better in the abstract: what matters is matching the base to the mattress.

Memory foam and hybrid mattresses generally need a ventilated base with gaps no wider than 7cm between slats, otherwise the foam can sag between supports and airflow suffers. Pocket sprung mattresses are more forgiving but still benefit from a centre rail and central legs on a king size, since 150cm is a long unsupported span.

Check the stated mattress depth allowance too. Upholstered frames with tall side rails can swallow a shallow mattress, leaving the sleeping surface sitting below the surround. A mattress depth of around 22cm to 28cm suits most king size frames. If you are replacing both at once, it is worth reading the frame specification first and then choosing from the mattresses UK sale selection to match.

Decide Whether You Need Storage

A king size footprint is a large amount of floor to leave empty. Drawer beds and ottoman lift bases turn that space into usable storage without adding a single centimetre to the room.

Side drawers need clear floor beside the bed to open fully, so measure the distance to the nearest wall or wardrobe. End drawers work better in rooms where one side sits tight against a wall. Ottoman bases need vertical clearance instead: check that a sloped ceiling or a low window sill will not block the lid as it rises.

Storage bases do add weight and complexity to assembly, and they cost more than an open frame. If your wardrobes already cope and you simply want a clean line under the bed, a slim frame is the calmer choice.

Read the Delivery and Assembly Detail Before Ordering

Large furniture arrives flat packed in several cartons. Before you order, look for three pieces of information: the number of cartons, the largest carton dimension and whether assembly is required. The largest carton is usually the headboard, and on a winged or tall buttoned design it can be close to 170cm across. That is the piece that struggles on tight stair turns.

Measure your hallway width, the narrowest doorway, and the diagonal clearance on any staircase half landing. If access is genuinely tight, look for frames that ship with a split headboard or a knock down construction rather than a single rigid panel.

We offer free delivery to most UK mainland postcodes, and Returns are available up to 30 days, which gives you room to check the parts on arrival. Inspect cartons before the driver leaves and open each one on the day it lands rather than storing it unopened for a fortnight.

Assembly on a king size frame is usually a two person job. Allow around an hour for a simple platform frame and closer to two for an upholstered design with a storage base. Lay the fixings out by stage, keep the Allen key close and only fully tighten once every bolt is started.

Judge Fabric, Colour and Finish Without Seeing It

Screens shift colour, so treat product photography as a guide to tone rather than an exact match. Look for images shot in daylight and in more than one setting, and read the written fabric description for weave type and pile direction, which tells you more than a single photograph.

Neutrals are the safe long term choice because the rest of the room can change around them. Charcoal, stone, oatmeal and taupe all work with timber, brass and black metal. If you want a stronger tone, anchor it: pick a bed colour that already appears somewhere in the room, in curtains, art or a rug, so it reads as deliberate.

Also think about what sits beside the bed. A tall upholstered headboard next to low slim cabinets creates a nice contrast in height. Matching the timber tone of your modern bedside cabinets UK to the frame is not essential, but keeping the undertone consistent, warm with warm or cool with cool, stops the scheme feeling accidental.

Buy the Bed First, Then the Rest

The bed sets the scale and the palette for everything else in a bedroom, so buy it first and let the other pieces follow. Once the frame is chosen, wardrobes, drawers and mirrors are easier to select because you already know the dominant material and tone. If you are furnishing from scratch, coordinated modern bedroom furniture sets UK sale take some of that guesswork away.

Our full collection sits online at Furniture in Fashion, where filters for size, material and storage let you narrow a long list down to a handful of realistic options quickly.

A Short Checklist Before You Order

Confirm room width and length, and mark the frame footprint on the floor with masking tape. Note the external frame dimensions rather than the mattress size. Check slat type against your mattress. Decide on storage now rather than later. Measure hallway, doorway and stair access. Read the carton count. Confirm whether a centre support is included. Check the mattress depth the frame is designed for.

Run through those eight points and buying a king size bed online becomes a straightforward decision rather than a gamble.

Frequently Asked Questions

What size is a UK king size bed?

A UK king size mattress measures 150cm by 200cm, or 5ft by 6ft 6in. The frame around it is larger, typically 158cm to 175cm wide depending on the style and upholstery.

What is the smallest room a king size bed will fit in?

As a practical minimum, a room around 3m by 3.4m will take a king size frame with walking space on both sides. Anything tighter and you should consider a double or place the bed against one wall.

Do I need a centre support on a king size bed?

Yes. At 150cm wide the slat span is long enough to flex under load, so a centre rail with legs is important for both mattress life and frame stability. Most quality king size frames include one.

Can I use my existing double mattress on a king size frame?

No. A double mattress is 135cm wide and would leave a 15cm gap on a king size frame. The mattress needs to match the frame size exactly for support and safety.

How long does a king size bed take to assemble?

Allow around an hour for a simple frame and up to two hours for an upholstered or storage design. It is much easier with two people, particularly when lifting the headboard into position.