how to install a handrail for a staircase? To supprt elderly people climbing up the stairs in a two storey house?

Burf7 years ago
Its much too involved to explain here but here is an excellent link to a complete tutorial, suitable for the home handyman:
Before you start, do double-check with  your local building inspectors to find out whether there are specific code requirements in your area, since otherwise you may have to redo the job before you can sell the place. (Good advice for anything that's potentially safety-related.)