I have had planning approved for a side extension to my property but am considering a conservatory instead(cost, time etc..). I was advised to check with the planning office whether or not i need to adjust the drawings to suit. The conservatory will be slightly smaller than what the extension would be but the roofline at the highest point will be roughly 4.1m from external floor level.Can anyone advise whether or not the planning office need to be notified of these changes.Thanks