How much does it cost?

How much does it cost?

What does it cost to build an ADU?

One of the biggest questions we get is “How Much Does an ADU Cost”? We strive to keep costs down, while building a quality ADU.

There are several factors that go into pricing an ADU. This includes how it will be used, and whether the unit is detached or a conversion of space. Our job, is to go into your home, evaluate your space, give expertise and figure out the best way to convert the space into the perfect ADU for you.

What is the Construction Cost Price Per Square Foot?

The price per square foot for ADUs are higher than a single-family house, because we are compressing the most expensive parts of a home into a small space. Typically, the cost is around $150 per square foot. The price can fluctuate. Depending on the size and finishes of a project, can dictate the cost of your ADU. Our company has built ADUs as low as $50,000 and up to $200,000.

Can we talk about the design?

Although, ADUs are small, we always encourage you to meet with design professionals. A design professional, can help with maximizing your small space. We also recommend a survey or foundation survey. Your ADU might require a structural engineer to your design team. The cost of an Architect and Design professional depends on what type of ADU you are thinking of building, how many design professionals you need for your project, and other factors. This cost can be from $5,000 - $10,000 for your design professionals.

What about Permitting?

There is a cost to obtain building permits for ADUs. The cost for the City of Portland for a detached ADUs is approximately $4,000 - $5,500 for building permits. This is split into two payments

Are there other fees?

There are System Development Charges (SDC), which are city infrastructure fees for any construction for Water, Sewer and Parks fees. The City of Portland is currently waiving these fees for ADUs, which is a saving of around $10,000 - $12,000.

There is a permit fee for subcontractors. These permits are your plumbing, electrical, and mechanical permits that range in price, depending on the work around your project. These permits can cost $1,000 - $2,000, and can be accrued through the building permit process.

What about Value Engineering and Spec Choices?

We always make sure to evaluate each client´s project, to see if we can find them any savings. This happens during the design and construction process. We also help clients with their finish selection flooring, cabinets, tile, windows, and HVAC to help them achieve their final product, while using more cost-effective products or choices.

Why choose us as a company?

Our company is not only dedicated to our clients but also to our work. We put the time, effort and energy into each of our client´s projects and homes. We understand that every client and every home is different. We understand that this is your home, and a place that is important and meaningful to you. Not only do we do a great job with the construction process, but we sit down with our clients, we explain the process concisely and we are dedicated from start to finish. We meet each of our client´s individual needs. Let us help you build your next ADU.


  • Over 8 Years Of Experience

  • Great Coverage

  • Products Diversity

  • Highly Skilled Proffesionals

  • National Leadership

  • ​Green Builder Award Winner

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