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My semi-detached house is undergoing refurbishment and extension and I am hoping to change the existing old and damaged original grey pebble-dash with a new modern one such as K-Render in a lighter colour which I will also apply to the new extension. I will ensure this is compliant with building control.

However, my planning approval has the following condition
"The materials to be used in the construction of the external surfaces of the extension hereby permitted shall match those used in the existing building"

Does this mean I will be restricted in what I can do? My house is not listed, not in a conservation area and several nearby houses of the same style/construction as mine had done the same - replaced pebble-dash with smooth render.

So can I just go ahead and do it or do I need to speak to the council planning department or submit an amendment or apply for new permission?

Any advice will be very helpful.

I suspect it is a standard paragraph pasted in the planning approval notice. However, best check with them first.

DWD

I'm with DWD but look at it this way - the clause is there so that the new extension approved isn't finished in smooth render painted sky blue pink when the rest of the house is dull beige pebble dash. It would stick out like a sore thumb.

But if you'd painted the pebble dash sky blue pink last year, then finished the extension the same, it wouldn't. That's what it's aiming at.

The LA isn't going to take any notice for the period the work's going on, so if you change the original building to the finish desired for the extension, at the end of the day you'll be compliant with the condition & they won't have a leg to stand on to object.