other thing to consider is building regulations and whether compliance sign off will be needed
"usually cheaper than people might think"
I'm not too sure about the above statement, it usually works out at 10% of building costs + vat. Also, I'm not sure if the Architects drawings would include all the detail that an engineers drawings would, eg, steel specs, etc.
Still nowhere close to 10%. Again, if the architect insists on getting percentage based payment go somewhere else.Good for you. However, read my post again and you'll see it said "building costs".