Sliding Door Size Guide: Standard Sizes, Configurations & How to Measure

The standard sliding door size in the UK is around 2,090mm to 2,100mm tall, with widths ranging from 1,500mm for a compact two-panel unit up to 6m or more for wider multi-panel configurations. The most common size installed in UK homes sits around 2,400mm to 3,000mm wide. This guide covers standard sizes by panel count, how to work out what configuration fits your opening, how to measure correctly, and how sizing changes by material.

What is the standard sliding door size?

Standard sliding doors are typically 2,090mm to 2,100mm tall, with total widths determined by the number of panels — each panel usually measures 900mm to 1,200mm, so a two-panel door is typically 1,500mm to 2,400mm wide, and wider configurations scale up from there. Always confirm the exact figures against your chosen manufacturer, since sliding door systems vary more than standard hinged doors do.

What heights do sliding doors come in?

Millimetres

Feet & inches (approx)

2,000mm

6ft 6.75in

2,090mm

6ft 10in

2,100mm

6ft 10.5in

2,400mm

7ft 10.5in

2,500mm

8ft 2.5in


What widths do sliding doors come in, by panel count?

Panel count

Typical total width

Notes

2-panel

1,500mm–2,400mm

One fixed panel, one sliding panel — the most common configuration for small-to-medium openings

3-panel

2,700mm–3,600mm

Two fixed panels with one sliding, or other combinations depending on the system

4-panel

3,600mm–4,800mm

Popular for a "wall of glass" look across a wide rear elevation

5+ panel (bespoke)

4,800mm–6,000mm+

Large open-plan spaces, often on a multi-track system

 

What is the average sliding door size?

The average sliding door installed in UK homes is around 2,400mm to 3,000mm wide and 2,090mm to 2,100mm tall — typically a two- or three-panel configuration fitted to a standard rear-elevation opening. This is different from the full standard size range above: "standard" covers everything manufacturers offer, from compact two-panel units to large bespoke multi-track systems, while "average" reflects what most homeowners actually choose for a typical extension or patio opening. If you're planning a fairly standard-sized rear extension, this is the range to use as your starting point before checking your specific opening.

What size sliding door do you need for your opening?

Match your opening width to a panel configuration using the table below — narrower openings suit a two-panel door, while openings over 3.6m generally call for four or more panels.

Opening width

Typical configuration

1,500mm–2,400mm

2-panel

2,400mm–3,000mm

2-panel (wider leaves) or 3-panel

3,000mm–3,600mm

3-panel

3,600mm–4,800mm

4-panel

4,800mm–6,000mm+

4-panel or bespoke multi-track system

Fewer, wider panels give a cleaner sightline with less visible frame when the door is closed, but each panel is heavier and costs more to run smoothly. More panels spread the weight and cost across more individual leaves but add extra frame lines to the view. If you're not sure which balance suits your opening, ask your supplier for options at both ends of the range so you can compare the look before deciding.

How do you measure for a sliding door?

Measure the opening's width and height in three places each, use the smallest figure from each set, and add an allowance above the door height for the track and header before finalising your size.

Steps to measure correctly

  1. Measure the width three times at the top, middle, and bottom of the opening — and use the smallest figure.
  2. Measure the height three times on the left, in the centre, and on the right — and use the smallest figure.
  3. Check the opening is square by measuring both diagonals corner to corner. If they're within 2mm of each other, the opening is square.
  4. Allow extra height for the track and header. Sliding doors need housing above the door leaves for the track mechanism typically 50mm to 70mm on top of the door height itself which a standard hinged door doesn't require. This is one of the most common oversights when planning a sliding door opening.
  5. Confirm your fitting tolerance with the supplier before ordering, since this varies by system.

Do sliding door sizes vary by material?

Yes, aluminium-framed sliding doors can span the widest openings per panel because the frame is slimmer and structurally stronger, while uPVC and timber systems generally have lower practical limits per panel.

Material

Typical max panel width

Notes

Aluminium

1,200mm–1,500mm+

Slimmest sightlines; supports the widest spans, with bespoke systems reaching 4m or more per configuration

uPVC

900mm–1,000mm

Good thermal performance; more limited span per panel due to the weight and flex of wider uPVC sashes

Timber

800mm–900mm

Traditional look; generally the most limited span of the three due to weight

If you're planning a wide opening with fewer, larger panels, material choice becomes a genuine constraint rather than just a style preference; aluminium is usually the deciding factor once you move beyond a standard two- or three-panel configuration.

Find Your Perfect Sliding Door Size

Find Your Perfect Sliding Door Size

We know that the right door can completely change the appearance of a home.

We know that the right door can completely change the appearance of a home.

Now that you understand internal door sizes in the UK, you can confidently choose the right door for your home.

At Online Door Store UK, you can explore a wide selection of internal doors in popular UK sizes, including modern, traditional, glazed and oak designs.

Whether you are updating one room or renovating your entire home, choosing the correct size is the first step towards a perfect fit.

Browse our collection of internal doors and find the style that suits your home.

Frequently Asked Questions

What is the standard sliding door size?

Standard sliding doors are typically 2,090mm to 2,100mm tall. Width depends on the number of panels, a two-panel door is usually 1,500mm to 2,400mm wide, with wider multi-panel configurations available up to 6m or more.

What is the average sliding door size?

Most UK homeowners install a sliding door around 2,400mm to 3,000mm wide and 2,090mm to 2,100mm tall, typically as a two- or three-panel configuration for a standard rear extension or patio opening.

What is the smallest sliding door size available?

Compact two-panel sliding doors start at around 1,500mm wide, making them suitable for smaller openings such as a utility room or a narrow side-return extension.

How wide can a sliding door be?

Standard catalogue sizes go up to around 6m wide across multiple panels. Bespoke aluminium systems can go wider still, with some manufacturers offering configurations up to around 4m per panel run, though the practical maximum depends on structural opening size, glazing weight, and track capacity.

Do sliding doors need a bigger opening than hinged doors?

Not necessarily wider, but sliding doors do need extra height allowance above the door leaves for the track and header, typically 50mm to 70mm more than the door height itself — which isn't a factor with a standard hinged door.

Can sliding doors be made to a custom size?

Yes. Bespoke sizing is available for openings outside standard catalogue ranges, though it takes longer to manufacture and costs more than a standard configuration. Always confirm structural requirements for a bespoke size before finalising the opening.