I just stumbled onto this thread, I am late in posting - but the subject is interesting none the less.
Let me throw in this example, I have seen it as typical in southern California.
3,000 s.f. home, cost of construction is typically $150 s.f. so the home could cost $450,000. The contractor is normally be at about 20% profit after materials or $90,000 for his 5 months of part-time supervision. A good contractor can run 3 jobs at a time.
Now, the Architect/Designers charge various ways: Lets look at s.f.x $7 - which equals $21,000. Add engineering $1.50 s.f. mark-up and calc. ($4,500) and title-24 ($350). Plans done this way cost the client $25,850.
How does that look as a percentage? about 6%
I estimate the typical time spent to assemble plans for a 3,000 s.f. home (after design) is about 60 hrs. I would estimate the overall time spent with design included would be at the very most 120 hrs. Using these numbers that is $175 per hr. for architectural.
Now a home properly designed and in a location that is attractive will have a (lot) that could cost $500,000. The realtor sells that to the client and makes 1.5% on raw land which is $7,500. Then the realtor gets called upon to sell the project home since after construction the client realizes that he/she cannot afford the mortage/taxes. Since it was designed by a recognized architect, and the market is hot, it gets listed at $1.5 million.
This time the realtor will receive 3% and her/his pay is $45,000.
Summary:
Architect probably caves in to lower fee and only works for approx. $100 per hr, or 150 hrs. @ $100 or $15,000.
Contractor, during construction finds several insignificant errors in the plans and turns it into $30,000 worth of changes, increasing his profit to $96,000.
The realtor can cash in on a well designed, solid built home, in a hot market - sell it with only 40 hrs. invested toward that particular home and with $2,000 advertising. For an hourly wage of approx. $1,000 per hr.
Now you know why it is the realtors sitting on the beach with the fruity drinks.
(moral of story: try to receive 10% cost of construction which would be in keeping with the other trades, and send your significant other back to school to get a relators license)