Standard Door Sizes UK – A Complete Guide by NexGlazing

When choosing new doors for your home with standard door size UK, whether it’s internal doors with glass, internal French doors, or solid white internal doors, understanding the correct door size is essential. From improving accessibility to ensuring a perfect fit, door sizing plays a key role in both functionality and aesthetics.

In this guide, NexGlazing breaks down everything you need to know about standard door sizes in the UK, including internal, external, and bespoke options.

Internal Door Options for Every Home

Before diving into sizes, it’s worth exploring the popular styles available in the UK:

Internal glass doors UK – Perfect for letting natural light flow between rooms
Wooden doors with glass – A classic blend of warmth and elegance
Cheap internal doors – Budget-friendly solutions without compromising on style
Folding internal doors – Ideal for saving space in smaller homes
Half glazed internal doors – A balance of privacy and brightness
Solid white internal doors – Minimalist and modern choice
Each of these door types can be manufactured in standard or bespoke sizes to suit your space.

Are There Standard Door Sizes in the UK?

There isn’t a single universal door size in the UK. However, there are commonly used standard sizes that most manufacturers follow.

Many homes—especially older properties—may require custom or made-to-measure doors, while new builds must comply with building regulations for accessibility.

Standard Internal Door Sizes UK

The most common internal door height in England and Wales is:

Common Internal Door Widths:

457mm (18”)
533mm (21”)
610mm (24”)
686mm (27”)
711mm (28”)
762mm (30”) – Most common
838mm (33”)
In Scotland, slightly different sizes are often used, particularly narrower widths like 726mm.

Standard External (Front) Door Sizes UK

For front doors, building regulations play a major role.

Door Size Conversion Chart (UK)

Imperial Size (HxW)	Metric Size (mm)
78” x 18”	1981 x 457 mm
78” x 21”	1981 x 533 mm
78” x 24”	1981 x 610 mm
78” x 27”	1981 x 686 mm
78” x 30”	1981 x 762 mm
78” x 33”	1981 x 838 mm
80” x 28.5”	2040 x 726 mm

Fire Door Standard Sizes

Standard Patio, Bifold & French Door Sizes

1-Sliding Patio Doors:

Width range: 1180mm to 4800mm

2-Bifold Doors:

• 2-panel: 1800mm wide
• Up to 7-panel: 6420mm wide
• Max panel width: 1200mm

3-Internal & External French Doors:

Standard widths:
• 1200mm
• 1500mm
• 1800mm

With sidelights: up to 3000mm wide
These options are ideal for creating open-plan living spaces or connecting indoor and outdoor areas.

How to Measure a Door Correctly?

To ensure the perfect fit, follow these key measuring tips:

Measure from inside the property
Measure width horizontally (brick to brick or reveal to reveal)
Measure height vertically from top (head) to bottom
Include the door cill if it is part of the frame
Exclude it if it’s separate

Accurate measurements are crucial, especially when ordering bespoke doors.

Do You Need a Bespoke Door Size?

Not all homes fit standard dimensions. Older properties, unique layouts, or modern design preferences may require made-to-measure doors.

At NexGlazing, we offer fully customised solutions for:

Final Thoughts

Choosing the right door size isn’t just about measurements—it’s about creating a seamless fit that enhances your home’s style, comfort, and functionality.

Whether you’re installing internal glass doors, upgrading to folding internal doors, or selecting cheap internal doors for a renovation, understanding UK standard sizes will help you make the right decision.

FAQ's

1. Are cheap internal doors available in standard sizes?

Yes, cheap internal doors are widely available in standard UK sizes, making them a great option for budget-friendly renovations.

2. How do I measure my door correctly?

Measure from the inside:

Width: side to side (reveal to reveal)
Height: top to bottom (including frame if needed)
Accurate measurements ensure the door fits perfectly.

3. What are half glazed internal doors?

Half glazed internal doors have a combination of solid material and glass panels, allowing light to pass through while maintaining some privacy.

4. Are solid white internal doors a good choice?

Yes, solid white internal doors are a popular choice for modern homes due to their clean, minimal look and versatility

5. How do I measure my door correctly?