Sliding doors are made to measure, but most are between 1.5 m and 6 m wide and 2.1 m high, with two panels up to about 3 m wide and three or four panels above that. There is no single standard size, because each door is built to fit its structural opening, a little under the brick-to-brick width and height.
This guide covers common widths and panel layouts, standard and taller heights, how large a single panel can be, and how the door size relates to the hole in the wall.
What are the common sliding door widths?
The most common overall widths are 1.5 m, 1.8 m, 2.1 m, 2.4 m, 3 m, 3.6 m, 4 m, 4.8 m and 6 m. Widths up to about 2.4 m are typical replacements for older patio doors. Widths from 3 m to 6 m are typical of rear extensions and new openings, and corner doors can reach 8 m across both elevations.
These are reference points, not fixed sizes. A door can be made to any width within the limits of the system, so 2,650 mm is no harder to make than 2,400 mm. In our range, uPVC sliding doors go up to 3.6 m wide and aluminium up to 6 m.
How many panels will my sliding door have?
Panel count depends on the width and the system. The table shows typical layouts; your surveyor confirms the layout that suits your opening and the way you want it to open.
| Overall width | Typical panels | Typical systems |
|---|---|---|
| 1,500–2,100 mm | 2 | uPVC, aluminium, timber, tilt and slide |
| 2,400 mm | 2 | uPVC, aluminium, slimline, lift and slide |
| 3,000 mm | 2, or 3 on a three-track frame | Aluminium, uPVC, slimline, lift and slide, multi-track |
| 3,600 mm | 2 or 3 | 2 on slimline and lift and slide, 3 on standard aluminium and uPVC |
| 4,000 mm | 2 or 3 | Aluminium, slimline, lift and slide, multi-track |
| 4,800 mm | 3 or 4 | Aluminium, slimline, lift and slide, multi-track |
| 6,000 mm | 3 or 4 | Aluminium, slimline, lift and slide, multi-track |
Fewer, wider panels give a cleaner view, but each panel is heavier and needs a stronger system. More panels on more tracks let more of the width open.
How much of the width actually opens?
- Two panels, one sliding: about half the width
- Three panels on two tracks: about a third
- Three panels on three tracks: about two thirds
- Four panels opening from the centre: about half, in the middle
- External pocket door: the full width, as the panels slide into the wall
If opening width matters most, a multi-track sliding door opens more of the wall than a standard two-track frame of the same size.
How tall is a standard sliding door?
The standard height is 2.1 m, which matches most existing patio door openings and is the height our guide prices are based on. Taller doors at 2.4 m, 2.7 m and 3 m are available in many systems, usually where an extension has a higher ceiling or a new opening is being formed to take a taller door.
Taller panels need more glass, stiffer frames and often a deeper beam above, so they cost more. Our large sliding doors are built with 2.7 m high panels for floor-to-ceiling glass; as a guide price, a 3.6 m large door is £10,295–£12,595, fitted, inc VAT, at that 2.7 m height.
How big can a single sliding panel be?
Standard aluminium panels can be up to roughly 2.5–3 m wide and 2.5–3 m high, depending on the system. Lift and slide panels can be larger and much heavier, often several hundred kilograms, which is why they move on a lifting handle mechanism rather than ordinary rollers. uPVC panels are generally smaller, because the profile is less stiff.
Big panels have practical limits beyond the system itself. The glass has to be delivered, carried to the back of the house and lifted into place, so the surveyor checks gates, side passages and doorways. Very large panes may need lifting equipment, which is planned before delivery day.
How does the door size relate to the structural opening?
The structural opening is the hole in the wall, measured brick to brick and from the underside of the lintel to the floor. The door frame is made slightly smaller so it can be packed level and square, fixed and sealed, typically around 10 mm less in width and height, depending on the system and how true the opening is.
Floor levels matter too. The threshold has to sit at the right height relative to the finished floor inside and the patio outside, and low thresholds are typically 15–25 mm high. Our guide on how to measure for sliding doors explains how to take the measurements yourself.
What if my opening is the wrong size?
If the opening is narrower than the door you want, it can be widened, which is structural work. It needs structural calculations, usually a steel beam or lintel, and a Building Regulations application in England or a building warrant in Scotland. As a guide price inc VAT, widening to 3.6 m is £4,095 for the building work, with structural calculations from £450.
If the opening is slightly too wide or too tall, the door is simply made to suit it. Small gaps are packed and sealed, and larger differences can be built in or trimmed out as part of making good. Either way, the surveyor confirms the finished size before anything is ordered.
What sizes do corner and pocket doors come in?
Corner sliding doors are measured as the two elevations added together, so a door 2 m along each side counts as 4 m. In our range they run from 3 m to 8 m combined, typically with four panels up to 4.8 m and six above that. Taking out the corner post means the structure above needs engineered support, which the survey and the structural calculations cover.
External pocket doors need wall space as well as the opening itself, because each pocket must be at least as long as the panels that slide into it, plus room for the frame. In our range they run from 1.8 m to 6 m wide, with one panel at the smaller widths and two or three above that, and their guide prices include forming the pocket.
Common questions
What is the standard size of a sliding patio door?
There is no single standard, because sliding doors are made to measure. The most common replacement sizes are around 1.8 m and 2.4 m wide at 2.1 m high, with two panels. Extensions more often take doors 3–6 m wide with two to four panels. The door is made slightly smaller than the structural opening so it can be fitted level and sealed.
What is the widest sliding door you can get?
In our range, standard aluminium, slimline and lift and slide doors go up to 6 m wide, and corner, multi-track and large floor-to-ceiling doors up to 8 m. Wider doors use more panels or larger, heavier ones, so the structure above the opening and the access route for delivery are checked carefully at survey.
Can I have a sliding door taller than 2.1 m?
Yes. Many systems are available at 2.4 m, 2.7 m or 3 m high, and our large sliding doors use 2.7 m high panels. Taller doors cost more, because they need more glass and stiffer frames, and the opening may need a deeper beam. Our guide prices are based on the standard 2.1 m height unless stated, and your quote prices the actual height.
Do I give the structural opening or the door size?
Give the structural opening, meaning the brick-to-brick width and the height from the underside of the lintel to the floor, and say clearly that is what it is. The supplier then applies the right fitting allowance for the system. For fitted doors we measure at the free survey, so rough sizes are enough to get a guide price.