Home Extention Design - Architect

Require an Architect to draft,draw plans and submit them for approval to local couincil for house extension. Extension is for a room in the attic, with bathroonm and toilet as well as making a through lounge for ground floor reception rooms.
Location, near Harrow, London
Intention
Create extension draft plans for new room and amenities in the attic, and a through lounge
Submit and gain approval with council
Find a builder following approval to do the job Architect may help/advise a builder if known and experienced.
Further extension possibilities to be discussed with the architect.
Architects to provide quotes/details on drafting plans and submission.
House is a semi-detached property.