Improve what is working

If the site is technically healthy and the structure still fits the business, better copy and stronger proof may be enough. The contact path can often be shortened too.

Rebuild when the current setup keeps causing problems

A rebuild makes sense when every change is expensive, mobile use is poor, the structure no longer matches the business or security problems keep returning.

Decide from evidence

Look at customer questions, enquiry quality, page speed and the work required to maintain the site. Those signals matter more than whether the design feels old.