Domakihub How to Fit Bifold Doors: A Step-by-Step Installation Guide
Measure right, hang level, and adjust the hardware — here is exactly how to do it.
Reviewed by Domakihub home & decor pros · 2026-06-23 · 5 min read
Bifold doors are one of the most space-efficient choices for wardrobes, utility rooms, and internal openings in Greek homes, holiday rentals, and boutique hotels — they swing outward barely at all, so they work even in tight corridors and compact rooms. The video above from Ask This Old House walks through a real residential install; the steps below translate that process into a clear sequence you can follow or use to brief a carpenter. No structural work, building permit, or licensed trade is required for a standard internal bifold — the job is hardware, measurement, and alignment.
Bifold Doors vs. Other Door Types
A bifold door consists of two (or more) panels hinged together. When opened, the panels fold against each other and slide along a top track, clearing the opening while using only a fraction of the swing space that a conventional hinged door needs. This makes them ideal for built-in wardrobes, airing cupboards, laundry alcoves, and room dividers in apartments or villas where every square metre counts.
Interior bifolds are almost always a DIY or carpenter job with no permits required. The situation changes if you are cutting a new opening through a load-bearing wall — that requires a structural engineer and a building permit in Greece. Bifold doors that open onto an exterior terrace or garden (sometimes called aluminium bifold or multi-fold sliding systems) are a larger, specialised installation and are best handled by a certified window/door fabricator.
What You Need Before You Start
Measure the rough opening width and height carefully — measure at three points across the width (top, middle, bottom) and use the smallest figure. Bifold kits are sold by opening size; a door set slightly narrower than the opening is normal because the track and pivot hardware take up space. Most internal kits come with a top track, a bottom pivot pin, a top pivot bracket, a top guide roller, and the door panels pre-hinged in pairs.
Tools required: tape measure, pencil, spirit level (or laser level), drill, screwdriver, hacksaw or track cutter, wood chisel, and a stepladder. For timber frames you may also need a hammer and panel pins. Have a helper available — holding door panels while aligning pivot pins solo is frustrating.
How to Fit Bifold Doors: The 5 Key Steps
- 1
Prepare the opening and cut the track to length
Check that the door frame is square using a spirit level on both the vertical jambs and the head. Any twist greater than 5 mm needs to be shimmed or packed before you proceed — bifold hardware is unforgiving of out-of-square frames. Cut the top track to the exact width of the opening using a hacksaw. Most tracks have a pre-drilled hole pattern; if yours does not, mark and drill pilot holes every 300–400 mm to prevent the aluminium from splitting when you fix it.
- 2
Fix the top track to the head of the frame
Hold the track against the head (top of the opening) and use a spirit level to confirm it is perfectly horizontal — even a few millimetres of slope will cause the door to drift open or closed on its own. Fix it with the supplied screws. On a concrete or block lintel (common in Greek construction), use a hammer drill, appropriate raw plugs, and wood screws rather than the lightweight self-tappers supplied in most kits, which are designed for timber.
- 3
Install the bottom pivot and top pivot bracket
The bottom pivot pin sits on the floor and locates the leading edge of the door stack at the hinge side of the opening. Position it directly below the corresponding point on the top track, then fix it to the floor. On tiled floors — ubiquitous in Greek homes — use a tile drill bit and suitable anchors; do not crack the grout line by over-tightening. The top pivot bracket screws into the inside face of the frame jamb at the hinge side, at the height specified in your kit instructions (usually flush with or just below the track).
- 4
Hang the door panels
With a helper, tilt the door panels into position. Engage the top roller guide into the track slot first, then lower the bottom pivot pin into the floor socket. Engage the top pivot into its bracket. The door should now stand in the opening. Open and close it gently — the panels should fold smoothly and the leading edge should sit roughly central in the opening when closed. At this stage, minor misalignment is normal and expected; do not force anything.
- 5
Adjust and fit the bottom guide and door knob
Most kits include a bottom guide channel or a floor-mounted guide bracket that keeps the door panels from swinging out at the base. Slide this onto the bottom edge of the door (or fix it to the floor at the correct position) according to your kit instructions. Then use the adjustment screws on the pivot bracket and top pivot to fine-tune the vertical alignment and the gap between the door edge and the frame — aim for an even 2–3 mm reveal all around. Finally, fit the knob or flush pull to the door face and test the full open-close cycle several times.
Rather have a pro handle it?
Get a vetted renovation pro in your city — one number, booked in EN/EL/DE.
FAQ
- Do I need a building permit to fit bifold doors in Greece?
- For a standard internal bifold door replacing an existing door or covering a wardrobe opening, no permit is required. A permit is needed if you are cutting a new structural opening in a load-bearing wall, or installing a large exterior aluminium bifold system that changes the building envelope. When in doubt, consult a licensed civil engineer (politikos michanikos) before any structural work.
- My bifold door drags on the floor. How do I fix it?
- Dragging is almost always caused by the top pivot bracket being set too low, or the top track sagging at the centre. First, check that the track is level across its full length. Then raise the top pivot bracket by a millimetre at a time until the bottom of the door clears the floor by 5–8 mm — enough to avoid catching tiles or rugs without leaving an ugly gap.
- Can bifold doors be fitted to a concrete or block frame without timber?
- Yes. Use a hammer drill to make pilot holes in the concrete or block, insert appropriate plastic or metal raw plugs rated for the load, and fix with steel screws rather than the thin self-tappers in the kit. For the bottom pivot on a tiled floor, use a diamond-tipped tile drill bit at slow speed with water cooling to avoid cracking the tile, then plug and fix as normal.