On Fri, 12 Jan 2018 20:01:18 +0000, Tim Lamb wrote:

Existing pine string with plywood risers and plasterboard back to hide
the wedges. Brown wood stain so lots of work to improve.

Budget enquiry for a replacement in Oak with semi open risers starts at
£1800!

Anyone found a cheaper way?

Could you keep the stringers and strip out the backing, risers and treads
and just replace the treads and bannisters/rails with oak?

The stringers could be painted to match wall colours which would 'hide'
them and emphasise the oak used elsewhere.