Although it goes against the grain to not DIY what’s probably a simple installation, it might pay to have this done professionally. Whilst the installation might be easy, the requirement isn’t. It’s a safety feature that has to satisfy an insurance company, who will probably be happy if the work was done to local Building Regs, as hopper says.
In addition to them having done this sort of work before and knowing the rules, the advantage of having the job done commercially is that it transfers responsibility to them. Jimmie, acting as an ordinary member of the public not required to understand technical details of any sort, meets his obligation to protect visitors by having a handrail installed professionally. In the event they botch the job and someone suffers hideously expensive life-changing injuries, it’s not Jimmies problem. His insurer might refuse to pay, but that doesn’t mean Jimmie picks up the bill.
Round my home I’m generally prepared to do anything that doesn’t involve safety, legal obligations, or insurance. It’s because being competent to do the work doesn’t solve the big problem in these cases, which is who pays and takes responsibility if it goes wrong. If the bill might exceed a few thousands or result in a prosecution, I don’t want to be on the hook for it.
Dave
In early 2022 I built a steel handrail for my mother to use our outside, and quite steep, cellar steps. I spent some time looking at commercially fitted installations for similar requirements, and my lightweight construction is cheaper(almost £40, and I still have most of the fixings for other jobs), stiffer, comfortably sized and more securely fitted at a usable height. Well it was, because now Dad’s the user it could do with coming up a bit.
I didn’t get around to building a rail for the 3 front steps, because I couldn’t find any satisfactory way of bracing it without blocking access to the letterbox. My initial research as above showed that many rails for open steps are too weak to be of much actual use.