How Much Does an ADU Cost in Portland Oregon

If you've been thinking about building an ADU on your Portland property the first question that comes up is always the same. How much is this actually going to cost me?

It's a fair question and one we get asked constantly. The honest answer is it depends on a few key factors but we can give you a realistic range based on what we see every day building ADUs throughout the Portland metro area.

The short answer

Most ADUs in Portland cost somewhere between $150,000 and $350,000 to build. That's a wide range and for good reason. A small studio garage conversion looks nothing like a fully detached two bedroom unit with a full kitchen and separate entrance. The size, the type, the finishes and the condition of your existing property all play a role in where your project lands within that range.

What type of ADU are you building

The type of ADU you build is the biggest factor in cost. There are three main types and each comes with a different price range.

• A garage conversion is typically the most affordable option. You're working with an existing structure which saves on foundation and framing costs. Most garage conversions in Portland run between $80,000 and $150,000 depending on the condition of the garage and the level of finish you're going for.
• An attached ADU shares a wall with your existing home. Because it connects to existing structure and utilities it tends to be more affordable than a fully detached unit. Expect to spend somewhere between $120,000 and $220,000 for an attached ADU in the Portland area.
• A detached ADU is its own separate structure on your property. It requires its own foundation, framing, electrical, plumbing and HVAC from scratch. This is the most expensive option but also the most flexible and typically the most valuable in terms of rental income potential. Detached ADUs in Portland generally run between $180,000 and $350,000 or more depending on size and finishes.

What drives the cost up

A few things consistently push ADU costs higher in Portland. Size is the obvious one. A 400 square foot studio costs significantly less than an 800 square foot two bedroom. Finishes matter too. High end tile, custom cabinets and premium appliances add up fast. Site conditions can also affect cost. If your lot has challenging terrain, limited access or requires significant utility work to connect to your existing systems you can expect those costs to be reflected in the final number.

What about permits

Portland has become significantly more ADU friendly over the last several years. The city actively encourages ADU construction as a way to address housing density and has reduced many of the barriers that used to make permitting a headache. That said permits are still required and the cost and timeline vary depending on your specific project and location. We assist all of our clients through the permitting process and help make sure everything is in order before construction begins.

Is an ADU worth the investment

For most Portland homeowners the answer is yes. Portland's rental market is strong and a well built ADU can generate meaningful rental income that offsets the construction cost over time. Beyond rental income an ADU adds significant equity to your property. Homes with permitted ADUs consistently sell for more than comparable homes without them in the Portland market.

Beyond the financial return many of our clients build ADUs for personal reasons. Housing a family member, creating a home office, adding a guest space. The financial upside is just a bonus.

How to get an accurate estimate

The only way to get a truly accurate number for your specific project is to have someone come look at your property and understand exactly what you're trying to build. Every lot is different. Every project is different.

At Elevate Construction we offer a free consultation where we'll walk through your property, talk through your goals and put together a realistic picture of what your ADU project would involve and what it would cost. No pressure and no obligation. Just honest information so you can make the right decision for your home and your family.

We've been building ADUs and home additions in the Portland metro area for over 25 years. We know this market, we know the permitting process and we know how to build something that lasts.

If you're ready to find out what an ADU could look like on your property give us a call at 503-944-9796 or fill out the form below to schedule your free consultation.