So, you're thinking about building an ADU in Portland. You've probably heard the permitting process can be a real beast, right? It's true, there are a lot of hoops to jump through, and those hoops definitely come with price tags. But what are we *really* talking about when it comes to permitting costs? Let's dig in.
What Makes ADU Permitting Costs Go Up or Down in Portland?
Permitting isn't just one flat fee; it's actually a whole bunch of fees based on a few key things. You've got the city's basic fees, of course, but then other stuff can really swing the total.
- How Big Your ADU Is and What It Includes: A small, detached 400 sq ft ADU will have different fees than an 800 sq ft unit with a full kitchen and two bedrooms. Generally, bigger projects mean more complex reviews and, yep, higher fees.
- Where in Portland You're Building: While the basic fees are the same city-wide, some projects might need extra reviews. This depends on things like zoning, environmental overlays, or if you're in a historic district. For example, building in a neighborhood like Ladd's Addition could mean extra design review steps, even for just an ADU.
- Utility Connections: This is a huge one. Are you hooking into existing sewer and water lines, or do you need brand new taps? New connections, especially for sewer, can add a lot to the cost — often tens of thousands. These aren't part of the permit itself, but the permit makes you get them.
- Challenges on Your Specific Site: Steep slopes, poor soil (which we see a lot in parts of Southwest Portland), or being close to sensitive environmental areas can mean you need extra studies or engineering. That means more review time and, you guessed it, more fees.
- What Kind of ADU You're Building: Converting an old garage or basement often has lower permit fees than building a brand new detached structure. Why? Because you're reusing an existing footprint and usually some utilities, too.
Typical Permitting Cost Ranges for Portland ADUs
Okay, let's talk numbers. I know you don't want to hear ---