- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 29 Jan 2018
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
How to ensure UK transport infrastructure copes with severe winter weather.
Location shortlist for controversial new footbridge revealed.
Under the Party Wall Act a property owner has the legal right to do works that might otherwise constitute trespass or nuisance.
BSRIA examine the 'unpredictable' 2018 global air conditioning market.
ICE publish new report calling for new sector-wide body to help avert structural failures.
The rainbow JCB will be making a welcome return to the London Build Expo on 23 and 24 October at Olympia.
An introductory article to external works - all activities carried out to the external environment of a building project.
With the clock ticking, RIBA say that a 'no deal Brexit' will be "disastrous" for the architecture profession.
The focus is generally on the lime binder, but the aggregate is actually the most significant element.
The importance of communication, collaboration and simplicity when planning construction projects.