Do you mean the design guidelines like colour schemes, fence ext... Or the thing like double storey only
Like double storey and roof type?
I'm in stage 1 and for us the double storey was a 88B restriction.
The roofs and other things i don't remember if it was in 88b but developer would have to approve your plans including external colours before it goes to council.
Not sure whats in 88B for other stages your solicitor is the person to answer all of it.