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Standard Door Sizes and Dimensions in the UK
In the UK, standard door sizes for both exterior and internal doors are typically based on imperial measurements (feet and inches), with metric equivalents often provided.
These sizes are standardised to ensure compatibility with common door frames, hinges, and fittings. Standard UK door sizes must comply with specific building regulations to ensure accessibility and safety.
Door jambs, the vertical portions of the door frame, support the door and must be sized to accommodate the door leaf and clearances. However, when it comes to external front doors, which are often made to measure due to variations in property designs, it’s critical to get a proper survey done before purchasing.
At Green Central, we offer a free survey with every order to measure up accurately for all installations, ensuring your external door fits perfectly.
Below is a detailed breakdown of standard dimensions.
Standard Front Door Sizes in the UK
Front doors are more robust, secure, and weatherproof, making them taller, wider, and thicker than internal doors. Since external doors are often made to measure to suit specific property requirements, it’s essential to have a professional survey conducted before buying as the cost of a new front door isn’t cheap if you get it wrong.
Accurate measurements are crucial when purchasing or installing a new door, especially if you are considering expanding entry door sizes during major renovations.
Common Front Door Sizes
| Width | Height: 6’6” (1981 mm) | Height: 6’8” (2032 mm) |
|---|---|---|
| 2’6” (762 mm) | 6’6” (1981 mm) | 6’8” (2032 mm) |
| 2’9” (838 mm) | 6’6” (1981 mm) | 6’8” (2032 mm) |
| 2’10” (864 mm) * | 6’6” (1981 mm) | 6’8” (2032 mm) |
| 3’0” (914 mm) | 6’6” (1981 mm) | 6’8” (2032 mm) |
*Note: 2’10” (864 mm) is the most common width. Thickness is typically 1.75” (44 mm).
Front Door Jambs
- Depth: Matches external wall thickness, typically 4.5 to 6 inches (115–150 mm).
- Width: Adds about 1–1.5 inches (25–38 mm) total clearance to the door width.
- Height: Matches door height plus clearance, typically 6 feet 7 inches (2010 mm) or 6 feet 9 inches (2060 mm).
Most external doors typically range from 44mm to 54mm in thickness, but can vary significantly based on the door type.
Common Front Door Jambs Sizing
| Width | Jamb Height: 6’7” (2010 mm) | Jamb Height: 6’9” (2060 mm) | Jamb Width (with clearance) | Jamb Depth |
|---|---|---|---|---|
| 2’6” (762 mm) | 6’7” (2010 mm) | 6’9” (2060 mm) | 787–800 mm | 115–150 mm |
| 2’9” (838 mm) | 6’7” (2010 mm) | 6’9” (2060 mm) | 863–876 mm | 115–150 mm |
| 2’10” (864 mm) * | 6’7” (2010 mm) | 6’9” (2060 mm) | 889–902 mm | 115–150 mm |
| 3’0” (914 mm) | 6’7” (2010 mm) | 6’9” (2060 mm) | 939–952 mm | 115–150 mm |
*Note: 2’10” (864 mm) is the most common width.
Notes:
- The 864 mm x 1981 mm (2’10” x 6’6”) size is common for front doors, but a survey is recommended due to made-to-measure requirements.
- Metric sizes like 900 mm x 2100 mm may appear in newer builds.
- Larger sizes (e.g., 914 mm wide) are for grand entrances or accessibility. Contact Green Central for a free survey to get it right.
Why it’s Best to Let the Pros Measure Up You Door
Fitting an external door correctly is crucial for maximising energy efficiency in your home. While our door size guide is helpful, a poorly installed door can lead to draughts, heat loss, and increased energy bills, undermining the insulation properties that modern doors are designed to provide.
Proper alignment with the frame, secure sealing around the jambs, and the use of weatherproofing strips ensure an airtight fit, preventing cold air from entering and warm air from escaping. This is especially important given UK Building Regulations like Part L, which emphasise the importance of having an energy-efficient front door.
At Green Central, our free survey with every order ensures precise measurements and installation, helping you achieve optimal thermal performance and reduce your environmental footprint while keeping your home comfortable year-round.
Need help with bigger openings? Check out our standard bifold door size charts for more information and help.
Standard Internal Door Sizes in the UK
Internal doors are generally smaller and lighter than exterior doors, as they don’t require the same level of security or weather resistance.
Door widths can vary between regions such as England, Wales, and Scotland, with standard measurements differing based on geographic location.
Common Internal Door Sizes
| Width | Height: 6’6” (1981 mm) |
|---|---|
| 2’0” (610 mm) | 6’6” (1981 mm) |
| 2’3” (686 mm) | 6’6” (1981 mm) |
| 2’6” (762 mm) * | 6’6” (1981 mm) |
| 2’9” (838 mm) | 6’6” (1981 mm) |
| 3’0” (914 mm) | 6’6” (1981 mm) |
*Note: 2’6” (762 mm) is the most common width. Thickness is typically 1.38” (35 mm).
Additional Note: The clear opening of the door must meet certain standards for wheelchair access, distinct from just the width of the door itself. This ensures that internal doors in visitable dwellings are accessible.
Internal Door Jambs
- Depth: Matches wall thickness, typically 4 to 5 inches (100–125 mm).
- Width: Adds about 1 inch (25 mm) total clearance to the door width.
- Height: Matches door height plus clearance, typically 6 feet 7 inches (2010 mm).
Interior door thicknesses are important for ensuring proper fit and functionality, with specific types such as FD60-rated fire doors requiring particular attention.
Table 2: Internal Door Jambs
| Width | Jamb Height: 6’7” (2010 mm) | Jamb Width (with clearance) | Jamb Depth |
|---|---|---|---|
| 2’0” (610 mm) | 6’7” (2010 mm) | 635 mm | 100–125 mm |
| 2’3” (686 mm) | 6’7” (2010 mm) | 711 mm | 100–125 mm |
| 2’6” (762 mm) * | 6’7” (2010 mm) | 787 mm | 100–125 mm |
| 2’9” (838 mm) | 6’7” (2010 mm) | 863 mm | 100–125 mm |
| 3’0” (914 mm) | 6’7” (2010 mm) | 939 mm | 100–125 mm |
*Note: 2’6” (762 mm) is the most common width.
Notes:
- The 762 mm x 1981 mm (2’6” x 6’6”) size is the most widely used.
- Smaller sizes (e.g., 610 mm) are often for cupboards; larger widths (e.g., 914 mm) for accessibility.
Additional Considerations
- Frame Sizes: The dimensions above refer to the door leaf. The full frame (including jambs) adds roughly 2–3 inches (50–75 mm) to the overall width and height.
- Jamb Construction:
- Internal jambs: Typically softwood or MDF, painted or stained.
- Exterior jambs: Often hardwood or treated softwood with weather seals.
- Regulations:
- Exterior Doors: Must comply with Part M (accessibility) and Part L (energy efficiency), potentially requiring minimum widths (e.g., 850 mm clear opening). A proper survey ensures compliance.
- Internal Doors: Fire doors must meet standards like BS 476, often requiring 40 mm thickness and reinforced jambs.
- Non-Standard Sizes: Older homes or custom builds may require bespoke options and jambs. Smaller doors or oversized doors cal all be managed but Green Central’s free survey can identify these needs.
- Double Doors: Double exterior doors typically use 762 mm or 838 mm leaves, with adjusted jambs—another reason to get a survey done.
If you’re planning a specific project, especially for external doors where precision is key, let us at Green Central help. We provide a free survey with every order to measure up accurately for all installations. Contact us for tailored advice and a perfect fit!
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