- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 04 Sep 2020
Door clear opening width
According to the approved document, the effective clear width of a door ‘…is the width of the opening measured at right angles to the wall in which the door is situated from the outside of the door stop on the door closing side to any obstruction on the hinge side, whether this be projecting door opening furniture, a weather board, the door or the door stop’
The minimum allowable clear opening widths for dwellings are set out below:
|Doorway clear opening width (mm)||Corridor clear passageway width (mm)|
|750 or wider||900 (when approached head on)|
|750||1200 (when approach is not head-on)|
|775||1050 (when approach is not head-on)|
|800||900 (when approach is not head on)|
|Direction and width of approach||New buildings (mm)||Existing buildings (mm)|
|At right angles to an access route at least 1,500 mm wide||800||750|
|At right angles to an access route at least 1,200 mm wide||825||775|
|External doors to buildings used by the general public.||1000||775|
The clear opening width can be calculated as:
- The width of the door leaf.
- Plus the gap between the leading edge of the door and the frame when the door is closed.
- Minus the width of the door stop at the leading edge of the door.
- Minus the thickness of the door leaf (or the door stop if that is wider).
- Minus the width of any obstructing door furniture (such as the door handle) that projects into the opening when the door is open. If the door opens to more than 90°, door furniture may not obstruct the clear opening width.
 Find out more
 Related articles on Designing Buildings Wiki
Featured articles and news
Guidance offered on COVID-19 green recovery, building safety and more.
Providing strength and support above the joists.
Enforcer will test and investigate product safety.
Underfloor air conditioning comes to 24 St James's Square.
Consultation on public right to buy unused public property.
IHBC resource offers improved consistency.
New laws to ‘retain and explain’ historic statues.
The principles and art of the possible. Book review.
From horse and cart to hypermarket.
How elements and processes work together in a systems approach.
CIOB offers digital guide to proactive methods of working.
Tech will drive professional development in fields tied to infrastructure.