Re: height of stair handrail not according to code
First let me welcome you to the wonderful world of fly-by-nights masquerading as contractors and emphasizing the importances of checking references and credentials of those you hire. You have my sympathy.
If you can post some pictures of what you have we may be able to make some recommendations. There are far to many variations of design to to make a general recommendation for your situations.
Be sure you live your life, because you are a long time dead.-Scottish Proverb