Dewi
Veteran
the planner 'suggested' today that the extension really should be matching i didnt realise i would need any. (The plans clearly showed it was to be rendered!!!)
Try and keep to render if you can as stone (it looks like ashlar stone not cladding) will cost much more. Depending where you are planning to extend will you be covering some of the existing stone? If so how about reusing a small amount to keep the planners sweet and rendering the rest?