What external door sizes are available? 

         
         
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Doors are generally produced in a range of popular and standard sizes. The actual range of standard sizes available will depend on the manufacturer and the style of door. If you need a door which isn't a standard size you will need to find out if your choice of door can be trimmed or made to custom sizes. There will be a limit to how much can be trimmed from any door, if any can at all, and custom made doors will be much more expensive.

 
         
  Door slabs or door sets are usually made in standard sizes  

External doors are often sold pre-hung as a complete door set , so they have an appropriate frame which matches the properties of the door slab itself. If you want to keep an existing frame you can also get door slabs without a frame. The standard sizes of door sets are the dimensions of the frame which will be installed in the rough opening. The rough opening will usually be 5-10 mm larger than the frame to allow for movement and straightening of the frame. This gap can then be filled with an insulating sealant. 

 
         
  Set for patio that has 6 doors with large glazed areas will bring plenty of light into your home  

The size of the door leaves you'll need for a double French door or a multi-leaf patio door will need to be worked out in relation to the dimensions of the opening and how many leaves the configuration will use. If you want sidelight or fanlight panels, you'll also need to consider their dimensions as they need to be included in the door frame's measurements. 

 
         
 

The standard heights and widths of external doors are often comparable to standard internal door sizes. The main difference is seen in the thickness of external doors. As external doors need to be more sturdy they are usually thicker, with 44mm (1 3/4") being the most common thickness in domestic settings. External doors that are 54mm (2 1/8"), or thicker, and 40 mm (1 2/3") are sometimes also available.

 
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Popular external door leaf sizes 

 
 

Popular external door leaf heights

 
 
 

Metric (mm)

Imperial (inches)

   
1981 mm 78"
   
2032 mm 80'"
   
2083 mm 82"
   
2134 mm 84"
   
 
 

Popular external door leaf widths 

 
 
 

Metric (mm)

Imperial (inches)

   
686 mm 27"
   
762 mm 30"
   
813 mm 32"
   
838 mm 33"
   
864 mm 34"
   
915 mm 36"
 
 
     
 

Popular external doorset sizes 

 
 

Popular external doorset heights 

 
    

Metric (mm)

Imperial (inches)

   
2067 mm 81" 
   
2118 mm 83" 
   
2168 mm 85" 
   
2220 mm 87" 
   
 
  Doorsets are squared and hung by manufacturer for a precision fit  
 

Popular external doorset widths

 
    

Metric (mm)

 Imperial (inches)

   
850 mm 33"
   
901 mm 35" 
   
926 mm 36" 
   
952 mm 37" 
   
1003 mm 39" 
 
         
      Wonkee Donkee says "An interior door should never be used for an exterior entrance. No amount of paint will prevent it warping and coming apart after a few years."  
         
      External door sets offer easier installation. Doorsets are squared and hung by manufacturer for precision  
         
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