Opportunity Knocks: A Workshop for ADUs and Living Space Conversions

Brian Libby • Sep 25, 2019

Like nearly every large American city, Portland possesses a large stock of historic homes dating to the early 20th century and in some cases even the late 19th century. These homes were built largely in neighborhoods that were conceived before automobiles became prevalent. Here in Portland, these relatively close-in neighborhoods are often called “streetcar suburbs,” because of how a vast network of streetcars and trolleys once served residents who lacked their own cars. That means these neighborhoods also tend to be relatively compact and pedestrian-friendly.

The style of these historic houses can vary greatly. There are remnants of the Victorian era, with ornament and stained glass. There are countless Arts and Crafts and Craftsman-style homes, simple yet showing off their handmade workmanship. There are many Foursquare houses and bungalows, perhaps the epitome of the white-picket-fence American Dream.

Unlike later eras of homes, these older residences tended to have basements. These spaces, as well as backyards and detached garages, can take on new life today as living-space conversions. These spaces can also take advantage of the city’s latest trend: Accessory Dwelling Units.

Before embarking on a remodel of old space or the creation of new space, there are plenty of factors to consider. That’s why ARCIFORM is hosting on November 21 st a special workshop on ADUs and living-space conversions. The workshop will be held at firm owners Anne and Richard De Wolf’s beautifully remodeled historic mansion, in which they have installed three short-term rental units (via Airbnb) with a unique and easy design for guests. 

Be it space for yourself or a rental unit, designing for flexibility is key, as is being mindful of the code. Living rooms and bedrooms must be at least 70 square feet, for example. It’s also important to be aware of the distance to neighboring properties, and to plan for fire egress. To convert a space into living quarters, there are also permits that must be procured for mechanical, electrical, and plumbing, as well as attendant fees based on the overall value of the property.

Accessory Dwelling Units, or ADUs, come with a number of additional restrictions: a limit of only one per lot in most cases, for example, as well as size and design restrictions in relation to the original house. When generating income from an ADU, one is not allowed to use the home as a place of work. But renting out an ADU creates the potential for profits that can pay for the bulk of your mortgage.

There are a few different types of ADUs: a basement, attic or garage conversion; an internal conversion utilizing rooms on the main floor of one’s home, an addition built onto a home, or detached new construction in the back yard of a home. Each can be turned into rentable space. In some cases, instead of renting out an ADU, homeowners have flipped the script: moving into the ADU themselves and renting out their home.


Since an ADU tends to be a smaller amount of square footage, space planning becomes particularly important. Combining the kitchen, dining, and living areasinto one space helps economize. But because ADUs have a smaller building footprint, therefore they can be very energy efficient.



In a sense, Portland has come full-circle. In an ongoing effort to promote density, our historic neighborhoods have become a new frontier, where the traditional single-family home can now be merely the anchor of a multi-residence property. That means not just density but opportunity for homeowners and renters alike — once one learns how to navigate this exciting opportunity.

Portland's Architecture
By Anne De Wolf 15 Sep, 2023
Since the easiest way to know the different styles is to understand the art, fashion, science, and industry of the times when they were built, you’ll also understand how Portland’s diverse architecture has told, and continues to tell, our collective story. History deepens experience. You’ll never see Portland through the same eyes again!
The Walter
By Marty Hegg 01 Sep, 2023
The next time you’re in the Mt Tabor neighborhood, hiking in the park , picking up plants at Portland Nursery , or ordering take out from Ya Hala , make a detour and drive up SE Belmont Street between 55 th Avenue and 58 th . Better yet, park the car and take a stroll. In the middle of the long block proudly sits the Jacob H. and Etna M. Cook House , built in 1892-93 and looking as handsome as ever. This historic home has journeyed through thick and thin, and current owner Lyrin Murphy is the reason it’s so beautiful today. Originally built as a Victorian in 1892 for Alexander and Maria Warner, it was one of several Victorians with small farms and orchards at the base of Mt. Tabor. They sold the home in 1904 to Jacob H. Cook, a local businessman and lumberman, and his wife, Etna. In 1909, the Cooks completed a major renovation of the home, transforming it into the Neoclassical style we see today. This was a trend amongst socially elite Portlanders, drawn to less-fussy, more open Colonial Revival, Neoclassical, and Craftsman designs, perhaps inspired by travels and exhibits at the 1905 World’s Fair in Portland . They often entertained in their home, hosting dance parties, luncheons, club events, and out-of-town guests. Their large-scale remodel helped push the area into upper-class status in Portland. Some prominent exterior changes were adding the main façade’s massive portico with Tuscan columns, a full-width porch and 2 nd floor balcony, and a smaller balcony at the 3 rd floor.
The Harlow Hotel
By Marty Hegg and Peter Herring 05 May, 2023
The Italianate brick building – NW Portland’s second oldest remaining commercial structure – has had its share of ups and downs. Captain John Harlow, a Maine sea captain and co-founder of the City of Troutdale, built it as the Grand Hotel in 1882, hoping to cash in on the coming transcontinental railroad station, just blocks away. High hopes were soon lowered, as Grand Central Station (now Union Station) was delayed for fourteen years.
Show More
Portland's Architecture
By Anne De Wolf 15 Sep, 2023
Since the easiest way to know the different styles is to understand the art, fashion, science, and industry of the times when they were built, you’ll also understand how Portland’s diverse architecture has told, and continues to tell, our collective story. History deepens experience. You’ll never see Portland through the same eyes again!
The Walter
By Marty Hegg 01 Sep, 2023
The next time you’re in the Mt Tabor neighborhood, hiking in the park , picking up plants at Portland Nursery , or ordering take out from Ya Hala , make a detour and drive up SE Belmont Street between 55 th Avenue and 58 th . Better yet, park the car and take a stroll. In the middle of the long block proudly sits the Jacob H. and Etna M. Cook House , built in 1892-93 and looking as handsome as ever. This historic home has journeyed through thick and thin, and current owner Lyrin Murphy is the reason it’s so beautiful today. Originally built as a Victorian in 1892 for Alexander and Maria Warner, it was one of several Victorians with small farms and orchards at the base of Mt. Tabor. They sold the home in 1904 to Jacob H. Cook, a local businessman and lumberman, and his wife, Etna. In 1909, the Cooks completed a major renovation of the home, transforming it into the Neoclassical style we see today. This was a trend amongst socially elite Portlanders, drawn to less-fussy, more open Colonial Revival, Neoclassical, and Craftsman designs, perhaps inspired by travels and exhibits at the 1905 World’s Fair in Portland . They often entertained in their home, hosting dance parties, luncheons, club events, and out-of-town guests. Their large-scale remodel helped push the area into upper-class status in Portland. Some prominent exterior changes were adding the main façade’s massive portico with Tuscan columns, a full-width porch and 2 nd floor balcony, and a smaller balcony at the 3 rd floor.
The Harlow Hotel
By Marty Hegg and Peter Herring 05 May, 2023
The Italianate brick building – NW Portland’s second oldest remaining commercial structure – has had its share of ups and downs. Captain John Harlow, a Maine sea captain and co-founder of the City of Troutdale, built it as the Grand Hotel in 1882, hoping to cash in on the coming transcontinental railroad station, just blocks away. High hopes were soon lowered, as Grand Central Station (now Union Station) was delayed for fourteen years.
By Sarah Crouse 03 May, 2023
Measuring a home is more than sizing and locating walls, windows, and doors. There are many more complex parts of a home that need to be captured in order to set our design team up for success during the design process. With remodeling comes moving openings, walls and fixtures, which inevitably means moving systems. Mechanical, electrical, and plumbing systems are typically hidden within walls and between floors, requiring a bit of know-how and experience to properly document, which is crucial for helping our design team to determine the feasibility and cost implications of our choices. Mechanical Systems:
By Sarah Crouse 04 Oct, 2022
Remodeling is an art that requires many talents – of course craftsmanship and technical knowledge – but also creativity AND organizational skills. No other step in the process taps into all of those trades quite like as-built documentation. When we pull out a tape measure, we do not only document distances, but how pieces are put together. Knowing why a post is in a particular location, or noting that a duct bisects a space helps the team document the as-built properly and makes communication during all phases of construction clearer and more concise. While measuring a house might sound simple and straightforward, it takes a seasoned crew to be efficient! Our team has a well-vetted checklist of things to measure and note, in addition to an order of operations that helps ensure nothing is missed and our client’s time is well-spent. Here is a peek into how we go about collecting this data: HOT TIP: Make sure to take breaks and have plenty of snacks and drinks on hand. Making mistakes during site measures can waste a lot of time, so making sure everyone is energized is key!
By Snow Blackwood 09 Jul, 2022
As I walk to the door of Gretchen Newmark and Jim Gerber’s 1910 Craftsman Bungalow, painted in a pale yellow with cream and periwinkle trim, I notice I’m feeling a little nervous, but I’m not sure why. Jim is a nutritionist who spent 40 years as a professor, teaching nutrition and supervising interns. Gretchen was a dietitian in private practice, collaborating with other health professionals to help people recover from eating disorders. Now she focuses on her passion—spiritual direction. They’ve spent many years helping people find healthy paths in life. I decide my nervousness is just an artifact of this long pandemic as I notice their garden, full of vivid blooms that settle my nerves. My photographer Christine and I mask up as I knock on their door. When Gretchen opens the door, she immediately puts us at ease. “No masks, unless you prefer; we’re fully vaccinated,” she says. We are, too, so we gratefully remove the cloths. I remark on the lovely garden, and how nicely it complements their home.
By Marty Hegg & Sarah Crouse 09 Jul, 2022
Quiz time: which ARCIFORM employee was raised in Detroit, Michigan, has held jobs as a fine woodworker, a stay-at-home-Dad and sailing instructor before his current job at ARCIFORM?  The one and only dependable, often-goofy and incredibly patient Joe Hoffman! As one of two Joes and one of two Hoffmans at ARCIFORM, Joe definitely knows how to set himself apart and make a lasting impression on staff and clients alike.
By ARCIFORM 09 Jul, 2022
Building Trusting Relationships by Design Arciform has been a premier design-build renovation and remodeling company for older buildings and homes in the greater Portland Metro area since 1997. From the very beginning, we set out to be the designers and craftspeople you could trust to achieve your vision. We aim to create a smooth, transparent process that involves you from start to end, and to deliver zero surprises – except the delighted surprise you feel when you see your finished project. For decades we’ve partnered with hundreds of people in the Pacific Northwest to bring their dreams to life. We believe that it is the relationships we build in the process of designing for you that are the real foundation of our success. Over time we’ve found that our relationships with our clients are similar to successful relationships we have with partners, good friends and family. They rest on trust engendered by the integrity of open communication, doing what you say, following up, and quickly making good if anything goes awry. So we thought we’d write a little about the ingredients that we think go into creating great relationships that, like our designs and work, endure. 
Fried Durkheimer House
By Holly Cullom 09 Jul, 2022
The ARCIFORM team has been hard at work restoring the historic Fried-Durkheimer House , also known locally as the first Morris Marks House, and the extensive renovations are nearing completion. Recently, we were able to take a look at the progress and talk to project manager Joe McAlester and the ARCIFORM crew about this impressive Italianate structure.
More Posts
Share by: