Building a fitted wardrobe with sliding doors is one of the most effective ways to maximise storage space in any bedroom. Unlike hinged doors that swing outward and require floor clearance, sliding doors glide along tracks mounted at the top and bottom, allowing you to place furniture or storage units directly in front of the wardrobe without obstructing access. This makes them an ideal choice for smaller rooms where every square metre counts. Fitted wardrobes also eliminate the unsightly gaps that occur between freestanding units and uneven walls, giving your room a seamless, custom-built appearance. Whether you are looking to convert an alcove or construct a full-wall storage solution, understanding the principles behind door fixtures and fastening systems will help you achieve professional results.
Planning and Measuring the Wardrobe Space
The first and most critical step in any fitted wardrobe project is accurate measurement. You will need to measure the width, height, and depth of the alcove or wall space where the wardrobe will sit. Take measurements at multiple points because walls and floors are rarely perfectly level. For the width, measure at the top, middle, and bottom of the space. For the height, measure at the left, centre, and right. Use the smallest measurement in each case to ensure your frame fits without force. A discrepancy of even 5mm can cause binding issues with sliding doors later on.
Once you have your base measurements, calculate the material quantities you will need. For a standard single-bedroom alcove approximately 1800mm wide and 2400mm high, you will typically need the following:
| Material | Quantity | Purpose |
|---|---|---|
| 50x50mm timber | 4 lengths | Top and bottom rails |
| 50x75mm timber | 2 lengths | Front and back rails |
| 18mm MDF | 2 sheets | Sliding doors (cut to size) |
| 18mm MDF | 1 sheet | Side panel |
| Sliding door track kit | 1 set | Top and bottom tracks with rollers |
| 75mm wood screws | 1 box | Frame assembly |
| 50mm wood screws | 1 box | Track fixing |
| 30mm wood screws | 1 box | Side panel fixing |
Do not forget to account for the thickness of the MDF doors when calculating the track length. The top and bottom tracks should span the full width of the opening plus any overlap required for the doors to cover the frame. For more advice on different door types and their installation requirements, refer to our dedicated resource on residential door construction.
Building the Top and Bottom Rails
The top and bottom rails form the horizontal framework that supports the entire wardrobe structure and carries the sliding door tracks. Start by cutting four pieces of 50x50mm timber to the exact width of your alcove. For the front and back rails, use thicker 50x75mm timber to provide additional rigidity. The assembly sequence is straightforward but requires careful alignment:
- Cut two lengths of 50x75mm timber to the alcove width for the front and back rails.
- Cut two lengths of 50x50mm timber to the alcove width for the top internal supports.
- Screw the front and back rails together using 75mm wood screws driven through the front rail into the back rail, creating a box-section assembly.
- Fix the assembly into the alcove using masonry anchors at the sides and into the ceiling joists at the top.
- Repeat the entire process for the bottom rail assembly, fixing it securely to the floor.
Ensure the front rail is set back slightly from the front edge of the alcove so that the sliding doors sit flush with the surrounding wall once installed. Use a spirit level constantly during installation to verify that both the top and bottom assemblies are perfectly horizontal. Any deviation will cause the doors to drift or bind when sliding. If you are working in a room where the floor is uneven, you may need to pack the bottom rail with timber shims before final fixing. Understanding how closets and built-in storage systems are designed can provide additional insight into getting the framing stage right.
Installing the Sliding Door Track System
With the top and bottom rails fixed securely in place, the next task is to install the sliding door track system. Sliding door kits typically include a top track with a channel for the hanging rollers and a bottom track with a guide groove for the floor wheels. The top track carries the full weight of each door through the top rollers, while the bottom track simply prevents the doors from swinging laterally.
Begin by cutting the top track to the full width of the front rail using a hacksaw or angle grinder with a metal cutting disc. Deburr the cut ends with a metal file to ensure the rollers move freely. Position the track flush with the front edge of the top rail and screw it down using the fixings supplied with the kit. The bottom track should be positioned directly below the top track, aligned using a plumb line dropped from the top track centreline. Screw the bottom track into the bottom rail, again ensuring it is dead straight along its entire length.
A common mistake at this stage is to assume that the tracks are straight simply because the rails are level. Even a slight twist in the timber can throw the tracks out of alignment. Run a straightedge along the full length of both tracks after fixing and check for gaps. Adjust as necessary before proceeding. For those new to framing and partition construction, the same principles of accurate alignment apply when building any structural framework.
Cutting and Preparing the Sliding Doors
With the tracks installed, you can now take precise measurements for the sliding doors. Measure the height from the top of the bottom track to the underside of the top track, then subtract 20mm to allow for the roller mechanism clearance. For the door width, divide the total opening width by the number of doors you plan to install. If you are fitting two doors, add an overlap of approximately 25mm per door so they cover the full opening when closed.
Cut the MDF sheets to size using a circular saw with a fine-tooth blade or have them cut at the timber yard. MDF produces significant dust when cut, so always wear a dust mask and work in a well-ventilated area. After cutting, round off the top edges of each door using a router with a 6mm rounding-over bit. This creates a smooth edge that slides easily past the track guides without catching.
- Measure door height as track height minus 20mm for roller clearance.
- Divide opening width by number of doors plus 25mm overlap per door.
- Cut MDF with a fine-tooth circular saw blade to minimise chipping.
- Route the top edges with a 6mm rounding-over bit for smooth sliding.
- Sand all cut edges with 120-grit sandpaper before finishing.
If you plan to add decorative panels or routing details to the door faces, now is the time to do it before the rollers are fitted. A simple recessed panel effect can be achieved by routing a 10mm deep groove around the perimeter of each door face. For more detailed guidance on MDF preparation and cabinet-grade finishing techniques, review our cabinetry construction guide.
Fitting Rollers and Hanging the Doors
Each sliding door requires two top rollers and two bottom guide wheels. The top rollers are the load-bearing components that run inside the top track channel, while the bottom wheels sit in the groove of the bottom track to prevent lateral movement. Mark the roller positions on the top edge of each door by dividing the door width into thirds. For a 610mm wide door, this means positioning the rollers at approximately 203mm and 406mm from the left edge.
Drill 2mm pilot holes at each marked position to prevent the MDF from splitting, then screw the roller hangers in place. The distance between the base of the wheel and the top of the door should be approximately 11mm. This standard setting works well for most installations, provided the floor and ceiling are reasonably level. Repeat the process for the bottom guide wheels, ensuring they align vertically with the top rollers.
Hanging the doors is a two-person job. Lift the first door into position, tilting it slightly to engage the top rollers into the top track channel, then lower the bottom wheels into the bottom track groove. Slide the door gently left and right across the full width to check for binding. If the door sticks at any point, the roller height likely needs adjustment. Most sliding door kits allow you to raise or lower each roller by turning an adjustment screw. Make fine adjustments of one quarter turn at a time until the door glides smoothly. For tips on achieving precise alignment, see our guide on typical closet dimensions and door clearance standards.
Side Panels and Finishing Touches
Once all doors are hanging correctly, the final structural job is to install the side panel that closes off the open end of the wardrobe. This panel hides the track mechanism and gives the wardrobe a finished, furniture-like appearance. Measure the height from floor to ceiling at the side of the wardrobe, then measure the depth from the back wall to the front edge of the front rail. Add 10mm to the width so the panel can be rounded off on the router.
Cut the side panel from 18mm MDF and route both outside edges to match the rounded profile of the doors. Drill and countersink four fixing holes across the top and bottom of the panel, and eight holes down the back edge. Use 30mm wood screws to fix the panel securely to the frame. Fill all visible screw heads with a decent wood filler and sand smooth once dry. Run a bead of decorators caulk around the edges where the panel meets the wall and ceiling for a seamless finish. If you are interested in design principles for custom built-in storage, our architecture section covers a wide range of millwork techniques.
The internal fit-out is entirely up to you. A simple hanging rail made from 25mm round steel tube fixed across the width works well for most wardrobes. If you prefer a combination of hanging space, shelving, and drawers, these can be purchased as flat-pack organisers or built from MDF offcuts. Paint the doors and panels to match your room decor using a solvent-based primer and two coats of water-based satin or eggshell paint. With careful planning and accurate execution, a well-fitted wardrobe with sliding doors will serve you for decades and add real value to your home.