Metric Data 05 Approach Entrance and Horizontal Circulation

Metric Data 05: Approach, Entrance and Horizontal Circulation

In Visitable Dwellings


In Metric Data 05 we look at the approach to dwellings, entrance and circulation. This includes details such as requirements for ramps, steps, corridors and sanitary facilities plus much more. These dimensions are useful when planning spaces and developing designs.

The Building regulations will be met when a new dwelling makes reasonable provision for most people, including wheelchair users, to approach and enter the dwelling and is able to access sanitary facilities and habitable rooms on the ground floor or entrance storey. The following data is in accordance with the building regulations Part M for dwellings, category 1, visitable dwellings. Note there are different criteria for accessible dwellings and for wheelchair user dwellings.


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Approach to a dwelling

  • Route should be level, gently sloping or ramped
  • Approach route minimum of 900mm wide with max cross fall of 1 in 40 
  • Where a driveway is the approach, a minimum of 900mm should be available for a wheelchair user to pass a parked car
01 Approach to dwelling02 Approach to dwelling with driveway


Individual flights of ramp

  • 1:15 no more than 5m long
  • 1:12 not more than 2m long


  • Every ramp has minimum clear width of 900mm
  • Every ramp flight has a top and bottom landing, with intermediate landing where required
  • Every landing is minimum of 1200mm long clear of any swing of door or gate


03 Ramp lengths04 Ramp landings

Stepped access (where ramped approach is not possible)

  • Steps have a uniform rise of 75-150mm, and minimum going of 280mm
  • No individual flight has a rise of more than 1800mm between landings
  • Every flight has a minimum of 900mm clear width
  • All landings, top, bottom and intermediate have a minimum length of 900mm
  • Every flight with three or more risers has a handrail on one side. Handrail must be 850-1000 above the pitch line of the flight and extend a minimum of 300mm beyond the top and bottom nosings

05 Stepped access

Private entrances and space within the dwelling

  • Entrance door has a minimum clear opening width of 775mm, 850mm preferable
  • Any threshold is an accessible threshold

06 Entrance door width07 Level threshold detail


Circulation and hallways

  • Every door to a habitable room and a room containing the WC has a minimum clear opening width according to table 
  • Any obstruction, such as a radiator, does not occur opposite a doorway, and is no longer than 2m in length
  • The corridor is not reduced to below a minimum of 750mm by an obstruction

widths of corridors and doorways

Sanitary facilities

  • Enable easy access to a WC, on the entrance storey.
  • Clear space must be provided to access the WC 
  • Any basin is positioned so that it remains accessible
  • Door to the WC opens outwards and has a clear opening width

12 WC dimensions13 WC Dimensions

Make sure you download the pdf guide that goes with this post by filling out your details below. And get your copy of the cad files too by heading over to the FIA shop.

If there is something specific you would like to see in this Metric Data series, please let us know and we can get it sorted. 

Information based on UK Building Regulations Approved Documents

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Metric Data 02 People sitting FI

Metric Data 03 Wheelchair user dims FI

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