How many steps before a handrail is required UK?
Also question is, how many steps can you have before you need a handrail?
To get to your question - the code doesn't refer to the exterior in steps but states from finished floor or platform to finished grade in excess of 30" requires a guard rail. It's with interior they mention any stairway with more than 3 risers (2 steps) will require a handrail.
Also to know, do you legally have to have a handrail on stairs?
If your home has three or fewer steps, there's no need to install a handrail. However, homes having four or more stairs must have a rail mounted on at least one side if the stairway is less than 44 inches wide. If one edge of the stairwell is open, that's where the handrail must be.
The BCA Codes 2014 state that, for a residential building, a handrail needs to be continuous on each flight of stairs. However, it does not need to be continuous on the landing between flights. A continuous handrail is required on a winder, except in cases where there is a newel post installed to provide a handhold.