Josh (and all),
I (too) am an architect here in Seattle, with my own practice, and do all sorts of project types... ...remodels, additions (both outward & upward), and new construction. I am also a consistently prepared applicant with the city of Seattle (DPD), as well as other jurisdictions - meaning that I consistently submit "code-compliant" drawings that isn't a waste of their time, therefore gets through the process quicker.
No, this wasn't meant to be a marketing post.
My point, is that architects (like me) bring a lot to the table, and are a valuable asset to have on your team. Do you "need" an architect (for Single Family Residential here in Seattle)? No. "Stamped drawings" are not required. BUT, you will need a contractor who has the drafting abilities (on staff) and the code knowledge, or like someone else said, YOU figure that all out, then hire a drafter to draw things up.
It ALL comes down to how "involved" you're looking to be - as with everything. Pay an architect and have them coordinate everything, to eliminate code & construction issues down the line (i.e. pay the money up front), or hire a contractor & drafter to figure everything out "on the fly", with change orders, delays, re-inspections, etc. (i.e. paying MORE money later).
It's always better to "have a plan" before you start. Unless you're the type that thrives on "diving right in, and seeing how it goes" - then more power to you.
Regarding the main question of your post... ...fee... ...yes, that amount is COMPLETELY in line with the scope you describe. Architects can charge a variety of ways - fixed fee, percentage of construction cost, or hourly. Personally, I HATE the "percentage of construction cost" approach, because it's a moving target. I charge "fixed fee", so that you know EXACTLY how much to budget for, and won't hesitate to pick up the phone (if there are problems)... ...which is the issue with "hourly" architects, where you hesitate to reach out with design problems, because that clock starts ticking (like an attorney). The ONLY time I use hourly, is during the construction process, because I have no idea how picky/needy the homewoner or contractor is going to be. And regarding my fixed fee structure, I've done enough projects now that I know how much of my time will be needed. I structure it accordingly, back-check the fee a few different ways (yes, also using the 5-15% of construction cost as an analysis), and provide the proposal.
As with everything, "economy of scale" should factor in. Design fees on a bathroom are going to be near the 15% range, whereas a complete house design is going to be in the 5-10% range... ...unless you're having a high-end custom home built, then figure 15% (or more) for an architect.
Anyways, I hope this helped.
Brandon