To make a basic bed frame you build a rectangular outer box from timber sized to your mattress, add a central support rail with legs down the middle, fit cross slats at regular intervals, then attach legs at each corner and a headboard if you want one. For a double bed at 135cm by 190cm, that comes down to accurate cutting, square corners and enough support beneath the mattress.
A simple platform frame is genuinely achievable with basic tools and a weekend. What determines whether it lasts is not complexity but accuracy: square corners and properly spaced slats matter far more than joinery flourishes.
Start with the mattress, not the timber. Measure the mattress you already own, or the one you intend to buy, and build the internal dimensions of the frame to match it with only a few millimetres of tolerance. A UK double mattress is 135cm by 190cm, a king size is 150cm by 200cm.
For the outer rails, planed softwood at around 45mm by 145mm is the usual choice: strong enough to carry the load, light enough to handle alone, and widely available. Hardwood looks better and lasts longer but costs more and is heavier to work. For the central support and legs, 70mm by 70mm timber gives ample strength.
Slats should be around 20mm thick and 70mm to 90mm wide. Thinner slats flex and eventually crack. Buy a little more timber than you calculate, because a knot or a warp in one length will otherwise stop the whole build.
Working to a 135cm by 190cm mattress with rails 45mm thick, cut two side rails at 190cm and two end rails at 144cm, which allows the end rails to sit between the side rails to give an internal width of 135cm. Adjust these figures if your timber thickness differs.
Cut one central support rail at 190cm to run head to foot down the middle, and three legs for it at your chosen height. Cut four corner legs to the same height. Then cut slats at 135cm each, allowing around thirteen to fifteen for a double.
Measure twice and cut once is not a cliché here. A side rail 5mm out of true throws the whole rectangle out of square, and the error compounds when you fit the slats.
Lay the four rails out on a flat floor and check the diagonals. In a true rectangle, both diagonal measurements are identical. Adjust until they match before fixing anything.
Join the corners with wood glue and long structural screws driven through the side rails into the end grain of the end rails, three per corner. For a stronger joint, add a corner block of offcut timber glued and screwed into the inside angle. Bolts through the rails with captive nuts allow future disassembly, which is worth considering if you ever expect to move the bed through a narrow doorway.
Check the diagonals again after fixing. Correcting a racked frame at this stage is easy. Correcting it after the slats are on is not.
The central rail is the component most home builds skip and most home builds regret. A double mattress carrying two adults puts significant load on the middle of the frame, and without a centre rail the slats sag and eventually snap.
Fit the central rail flush with the underside of the slat bearing height, running from the head rail to the foot rail down the centre line. Support it with at least three legs reaching the floor: one at each end and one in the middle.
Corner legs should sit inside the frame corners, glued and screwed through both adjoining rails so each leg is fixed on two axes. That double fixing is what stops the frame racking sideways over time. Finished height of 30cm to 40cm for the frame gives a comfortable surface height of 55cm to 65cm once a typical mattress is added.
Slats need a bearing surface. Screw a batten of around 25mm by 45mm along the inside of each side rail at the height you want the mattress base to sit, then lay the slats across from batten to batten, resting on the central rail in the middle.
Space slats no more than 7cm apart. Wider gaps allow foam mattresses to bulge through and void many mattress guarantees. Fix each slat with a single screw at each end so it cannot shift, or use slat holders if you prefer some give.
Padding the slat ends with adhesive felt before fixing prevents the friction that causes squeaking later. It takes a few minutes and saves a job further down the line.
A headboard can be as simple as a panel of 18mm plywood or MDF cut to the width of the frame and bolted to the head rail with two brackets. Padding it with foam and stapling fabric over the back gives an upholstered finish without specialist skills.
Sand every edge and corner properly, particularly anywhere a shin might meet the frame. Finish with a hardwearing wax, oil or water based varnish. Water based finishes have less odour and dry faster, which matters in a bedroom.
Let any finish cure fully before putting bedding on the frame. A day or two of ventilation is sensible.
Building makes sense if you need a non standard size, want a specific timber, or enjoy the work. It makes less sense if you want storage, an upholstered finish or an adjustable base, because those involve gas struts, upholstery frames and mechanisms that are difficult to replicate safely at home.
Storage in particular is hard to match. An ottoman base uses engineered lifting mechanisms rated for the weight of a mattress, and the capacity across the modern ottoman beds UK sale range is difficult to achieve with a home built frame. Similarly, the joinery on many of the modern wooden beds UK sale range uses machine cut joints that stay tight far longer than screwed butt joints.
Whichever route you take, the mattress deserves as much thought as the base. A well built frame with an unsuitable mattress still sleeps badly, and the modern mattresses UK range covers the pocket sprung and foam constructions that suit slatted bases best. If you would rather skip the build entirely, Furniture in Fashion carries frames in every standard UK size with full measurements listed.
The list is shorter than most guides suggest. A cordless drill with a driver bit, a set of spade or forstner bits for bolt holes, a tape measure, a combination square, a spirit level and a saw will complete the job.
A pocket hole jig is the single most useful optional addition, because it produces strong hidden joints without cutting joinery by hand. Clamps matter more than people expect: two long sash clamps hold the box square while you drill, which is the difference between a frame that sits flat and one that rocks.
Have the timber cut to length at the merchant if you do not own a suitable saw. Accurate machine cuts at the yard remove the largest source of error in the whole project, since a frame that is out of square by a few millimetres will never sit properly on the floor.
Squareness is the quality that determines whether the finished bed is silent or noisy. Measure both diagonals of the assembled rectangle: when the two measurements match, the frame is square. Clamp it in that position before any fixings go in permanently.
Level matters separately. Set the frame on the floor where it will live and check across both the width and the length. Older properties rarely have flat floors, and a small adjustable foot or a hardwood shim under one leg removes the rock that would otherwise develop into a squeak.
Central support is not optional at double width or above. A single central rail carried on its own legs prevents the slats sagging in the middle, which is the most common failure in home built frames and the main cause of a mattress developing a dip along its centre line.
Sand every surface that will be touched, particularly the top edges of the rails and any exposed corners. Working up to a fine grit before finishing produces a surface that feels bought rather than built.
Hardwax oil is the most forgiving finish for a bed frame. It penetrates rather than sitting on the surface, so knocks can be spot repaired without stripping the whole piece. Water based varnish gives a harder surface but shows chips more obviously.
Once the bed is in use, plan to retighten every bolt after the first month and then once or twice a year. Timber moves slightly as it settles into the humidity of a heated bedroom, and that brief maintenance pass keeps a home built frame as quiet in its fifth year as in its first.
Planed softwood at around 45mm by 145mm is the practical choice for rails, with 70mm by 70mm for legs and the central support. Hardwood lasts longer and looks better but costs more and is heavier to work.
No more than 7cm. Wider gaps let foam mattresses bulge through, reduce support and can invalidate a mattress guarantee.
Yes. Without a central rail and legs, the slats sag under the weight of two adults and will eventually crack. It is the single most important structural component after the outer box.
A frame of 30cm to 40cm gives a finished surface height of 55cm to 65cm with a typical mattress, which suits most adults sitting on the edge with feet flat on the floor.
Glue as well as screw every joint, fix the slats rather than leaving them loose, and pad the slat ends with felt before fitting. Recheck the fixings after the first few months of use.
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