im an architectural technician....same diff...
post a few pics or details and i'll have a better idea. architects have a 'scale of fees' that they have to abide by...depending on the level of service you require. ie. if you just require a sets of plans passed and approved by planners and building control, then that will be less expensive that if you require the architect to put the job out to tender, carry out tender analysis etc, carry out site inspections, write stage payment certificates etc.
im off work today, so i could find out more tomorrow for u if u stick some more info up....or pm me.