How to Build Fitted Wardrobes

Built-in fitted wardrobes make efficient use of space, eliminate the visual clutter of freestanding furniture, and can significantly add to a room’s finished quality. The wide cost range, from a few hundred pounds of board materials to £10,000 or more for an installation by a national fitted wardrobe company, reflects genuinely different outcomes in terms of material quality, precision and longevity. This guide covers the full process from planning through to finishing, with honest guidance on where DIY is feasible and where professional involvement pays for itself.

Planning and Measuring

Careful planning before purchasing a single board prevents expensive mistakes. Fitted wardrobes, unlike freestanding furniture, are built to the precise dimensions of your space, and most UK rooms are neither square, plumb nor level.

Measure thoroughly. Take measurements at multiple heights and depths:

• Width: measure at floor level, mid-height, and just below the ceiling at each end of the run. Record the smallest dimension, that is your maximum width.
• Height: measure at multiple points across the width. Note any variation, including any slope in the ceiling.
• Depth: measure available depth including any obstructions (skirting boards project 12–20 mm; architraves project further).
• Check for plumb on the walls using a spirit level: walls in older UK properties can be noticeably out of plumb over a full ceiling height.
• Check for chimney breast projections, alcove returns, or boxing-in that interrupts the run.
• Measure the diagonal to check for square in the alcove.

Sketch the layout. Draw a front elevation and plan view. Decide on the internal configuration: single-hanging (full height for dresses and long coats), double-hanging (two rails, one above the other), shelf sections, drawer units. As a rule of thumb, allow 1,500–1,700 mm of hanging length for dresses and long coats on a single rail, or about 1,000 mm per level for double hanging. Shelf spacing of 300–400 mm suits most folded clothing.

Door decision first. Hinged doors require swing clearance (equal to the door’s width in front of the wardrobe) and cannot be used when the wardrobe faces a tight space or the foot of a bed. Sliding doors need no swing clearance, but the doors overlap and slide in front of each other, so only part of the interior (about half, with two doors) is open at any one time. Bi-fold doors are a middle ground, some swing space needed but much less than full-height hinged doors.

Materials

B&Q, for example, sells an 18 mm MDF sheet of 2440 × 1220 mm at £30.¹ The same sheet weighs 33.2 kg.¹

MDF is the standard choice for painted fitted wardrobes. It takes paint exceptionally well (with appropriate primer), can be routed to add moulding profiles, and is dimensionally stable. Edges must be sealed with edge-banding or painted filler primer before finishing. It is heavy, does not hold screws in its face as well as plywood, and is susceptible to moisture swelling if exposed in bathrooms or under leaking pipes.

Melamine-faced chipboard (MFC) provides a factory-finished surface that does not require painting. The white or wood-effect finish is the dominant aesthetic in flat-pack furniture and is practical for bedroom wardrobes. Exposed edges require iron-on edge banding in a matching finish. Screw-holding strength in the core is lower than plywood but adequate for shelves and carcasses if appropriate fixings (cam locks, confirmat screws) are used.

Plywood offers the best screw-holding strength, and a sheet is often a little lighter than MDF of the same thickness, though weights vary by grade and maker. It is the preferred choice in joiners’ workshops for carcass construction. The face veneer can be painted or finished to a high standard. Cost is higher than MDF or MFC.

Tools Required

• Circular saw with guide rail (track saw), or table saw for accurate sheet cuts
• Drill/driver and a good set of bits
• Countersink bit
• Spirit level (600 mm and 1.2 m)
• Tape measure and pencil
• Clamps (at least four F-clamps or similar)
• Router with edge-profile bit (if adding moulding detail to MDF)
• Orbital sander (for MDF before painting)
• Dust extraction on the saw and sander, and a suitable dust mask: machining or sanding MDF releases wood dust, which can cause asthma and other respiratory problems²
• Iron and edge-banding trimmer (for MFC)
• Handsaw or jigsaw (for scribing cuts and notching around skirting boards)
• Scribing block and compass
• Mitre saw (for cornice, pelmet and architrave trims)

Building a Carcass

Each wardrobe bay is essentially a box, top, bottom, two sides, a back, and any internal shelves or divisions. The sequence is:

Step 1, Cut all panels to size. Work from your cutting list. Mark faces clearly. Cut the largest panels first (sides and tops), then smaller components. Use a guide rail on the circular saw for straight, tear-free cuts. If using MFC, cut with the face side down to reduce tear-out.

Step 2, Cut notches for skirting boards. The base panel and side panels need to be notched to fit around the skirting board at the wall end and, depending on the design, at the front. Measure the skirting depth and height precisely, scribing over the skirting is the alternative for side panels, which creates a tighter finish but requires more skill.

Step 3, Assemble the carcass. Fix the sides to the top and bottom panels using confirmat screws (7×50 mm is the usual size for 18 mm board), pocket screws, or cam lock fixings.³ Drill pilot holes. For painted MDF, PVA glue at the joints before screwing gives a very strong bond. Confirm the carcass is square by checking both diagonals, they must be equal. If not, clamp across the longer diagonal until equal and then fix the back panel to hold it square.

Step 4, Fit the back panel. A 9 mm MDF or 6 mm plywood back panel keeps the carcass square and provides a surface against which the inside of the wardrobe reads cleanly. Fix with 30 mm screws at 200 mm centres into the back edges of the side, top and bottom panels.

Step 5, Add shelf supports. Drill rows of 5 mm holes for adjustable shelf pins, following the 32 mm system: holes at 32 mm centres, with the front row 37 mm from the front edge.⁴ Alternatively, fix fixed shelf supports (battens or shelf brackets) at predetermined heights.

Fitting into an Alcove or Wall-to-Wall

Alcove fitting is the most common configuration. The walls of the alcove form three sides and you are building the front face of the wardrobe. Sequence:

1. Fix a horizontal batten to the back wall and one or both side walls as a shelf or top-panel bearer, this anchors the structure to the walls without needing freestanding feet.
2. Build the carcass fractionally undersize in width (2–3 mm) and slide into the alcove.
3. Scribe the side panels to the walls using a compass set to the widest gap, run the compass along the wall, transferring any irregularities to the panel, then plane or cut to the scribed line.
4. Secure to wall studs or masonry through the back or through a batten at the top.

Wall-to-wall fitting follows the same principle but requires careful measurement of the exact width at ceiling, mid-point and floor level, and often a scribing panel at each end.

Ceilings: Where the ceiling is not flat (sloping rooms, loft conversions), the top rail or pelmet must be scribed to the ceiling profile. Use a flexible scribing block or create a cardboard template of the ceiling slope and transfer it to the panel.

Chimney breast projections: If the wardrobe run crosses a chimney breast projection, either box around it (creating a shallower bay on that section) or design the wardrobe to stop either side, with the chimney breast acting as a natural division between two wardrobe bays.

Internal Fittings

Hanging rails: 25 mm diameter chrome or steel hanging rails are common. Fix end brackets into the carcass side panels at 1,600–1,800 mm from floor for single hanging, or at about 1,000 mm and 2,000 mm for double hanging. Rails longer than about 900 mm benefit from a centre support.

Shelves: Adjustable shelves on shelf pins allow flexibility. An 18 mm shelf is generally adequate for spans up to about 800 mm; use 25 mm or add a front lip (lipping) for longer spans to prevent sagging under load.

Drawers: Drawer boxes are most efficiently bought as pre-made units (melamine-coated or solid timber drawer boxes) fitted to undermount or side-mount drawer runners. Undermount runners are the current standard for quality installations, they are concealed beneath the drawer box and allow soft-close operation. Choose the runner length to suit the internal carcass depth: runner makers specify a minimum inside depth for each runner length, and the drawer box is sized to the runner.

Doors

Hinged doors on tall wardrobes need at least three hinges each, and heavy full-height doors often need more. The number of hinges depends on the door’s weight and height, so follow the hinge maker’s chart.⁵ Concealed cup hinges (Euro hinges), commonly with a 110° opening, allow adjustment in three axes.⁵ Frameless carcasses use full-overlay hinges; face-framed designs use half-overlay or inset. Soft-close dampers are standard practice.

Sliding doors use a top-hung or bottom-rolling track. Top-hung systems are simpler, cleaner and better suited to heavy doors. The track is fixed to a pelmet board at the ceiling or top of the wardrobe opening. The kit maker’s instructions give the deduction from the opening height to the door height. Sliding doors require a mirror, panel or glazed frame system, most are bought as complete kits rather than made individually.

Building Regulations: Part B Fire Doors

Approved Document B (Fire Safety) says that an attached or integral garage should be separated from the rest of the house by fire-resisting construction (minimum REI 30).⁶ Any door between the house and the garage should be a fire-resisting door rated at least E 30 Sa (FD 30 S).⁶ It should also be fitted with a self-closing device.⁶ The wardrobe is not part of that separation, which in practice means:

If you are building fitted wardrobes in a bedroom or hallway that has a door (or which could have a door) leading to an integral garage, the wardrobe door itself does not automatically require fire resistance, but the door between the room and the garage does, and it must be self-closing. If you are fitting a wardrobe into a hallway that forms the primary circulation route adjacent to a garage, check whether the wardrobe doors could impede access to the fire door. Do not hide the garage door behind wardrobe doors: the fire door needs to stay visible and usable. If the wardrobe is built against the wall between the house and the garage, do not chase cables into it or cut openings through it, because that wall is part of the fire separation.

If in doubt, consult your local authority building control before finishing the installation.

Cost Comparison

Common Mistakes

• Not checking walls and ceilings are plumb and level. Assuming a room is square leads to carcasses that lean, doors that do not hang straight, and gaps that cannot be disguised.
• Underspecifying shelf thickness. An 18 mm MDF shelf spanning 1,200 mm under a load of folded bedding is likely to sag visibly over time. Use 25 mm, add a front lipping, or insert a centre division.
• Painting MDF without primer. Raw MDF edges absorb primer and paint like a sponge, apply two coats of MDF primer to edges, lightly sand, then apply finish coats.
• Fitting sliding doors to an out-of-plumb alcove. Sliding door tracks require a level installation surface. If the floor or ceiling is out, a level sub-frame must be built first.
• Ignoring cable management. If the wardrobe will contain a safe, a TV, or LED lighting, plan the cable routes before the back panel goes on.

Pro Tips

• Paint MDF carcasses before assembly, it is far easier to apply finish coats to flat panels than to manoeuvre a brush in corners. Leave unpainted any surfaces that will be glued.
• Fit the back panel last, after checking for square. This is the point of no return, the back locks the carcass geometry permanently.
• Buy drawer boxes as components. Making drawer boxes from scratch is time-consuming; buying pre-made melamine boxes and fitting them to quality undermount runners gives a professional result in a fraction of the time.
• Sloping ceilings: Rather than scribing the top panel to the ceiling profile, fit a triangular infill piece and a cornice/pelmet that hides the gap, this is faster and gives a cleaner result on irregular plasterwork.

The rules in this note are those that apply in England. Scotland, Wales and Northern Ireland have their own building standards and permitted development rights.