Prefab dwellings seem like a great way to create ADUs — but they’re not as common as you might think. One Portland resident shows how it can work.
The author is quarantined in his own accessory dwelling unit, during the coronavirus pandemic.
ADU classes for Portland homeowners- postponed due to Coronavirus- Special offer for Portland Metro locals
Kol Peterson, one of the editors here, hosts a class called “Building An Accessory Dwelling Unit on your property,” on Please visit Kol’s site for more details.
I’m semi-retiring as a co-editor and numbers guy at accessorydwellings.org . But the site is alive and well.
It’s not intuitive, but prohibiting short-term rentals in ADUs won’t necessarily lead to a bigger supply of long-term residential housing. This post includes new data about the number of ADUs and short-term rentals in Portland, and the longevity of short-term rental listings.
Up for rent in Portland, February 2015: a tiny purple structure in someone’s backyard, apparently a converted garden shed. At 165 square feet, it had the same area of 5 … Continue reading
Collected research about accessory dwelling units (AKA granny flats, laneway houses, in-law units, etc) suggests they have many potential benefits, and two common arguments “against” are unsupported.
ADUs are especially promising as environmentally sensitive and affordable housing, and this potential should be investigated in detail.
Government rules strongly limit the development of ADUs, but they are not the only factor.
If the “grassroots” nature of their development is properly understood, ADUs have a lot of potential to address affordable housing needs.
Will building an ADU raise your property taxes? Very likely yes. Is that a good thing for the community?
Older persons are expected to benefit from ADUs. Is this happening now, and will it happen more in the future?
The single biggest and most specific fear mentioned by ADU opponents is loss of street parking. Is there any evidence on this?
New evidence shows that ADUs have serious potential as environmentally sensitive housing.
Opponents of ADUs frequently charge they will bring down property values for the whole neighborhood. What is the evidence?
Some survey results about ADU costs… and some thoughts about why ADU developers aren’t usually real estate “pros.”
It may seem odd to ask whether a housing form actually provides housing, but it’s a key premise in civic debates about accessory dwelling units.
ADUs are a really unusual form of development. This post goes over their special qualities, and explains why a lot of “debate” about ADUs is so repetitive.
Which hopes and fears about ADUs are most likely to be true? Explore claims and controversies with new evidence, in this 13-part series, beginning today.
Boy, you know it’s been a great day for the website when Carpet Carl tweet-checks it! A few days ago, a post about ADUs by Michael Andersen on bikeportland.org got … Continue reading
Imagine, in the abstract, the absentee landlord. I personally see him as a sort of Dickensian villain, say Sir Mulberry Hawk, coarse in intention despite his fine clothing and mustache, … Continue reading
In the past year or two, major builders have accomplished an interesting slight of hand. They have recognized the need for houses with ADUs, and started selling them for tidy … Continue reading
Today the Appraisal Journal publishes a research paper about residential properties with accessory dwelling units (ADUs). The paper describes an income-based method for appraising properties with ADUs, and concludes that … Continue reading
A quick note about language here. One reason people get so confused, and perhaps heated, about accessory dwellings is that language about them is confused. The different names conjure up … Continue reading
I’ve written here about how well my tiny house is working out — I converted my detached 1.5-car garage to a little “accessory dwelling unit” and have mostly rented it … Continue reading
I spent a lot of 2011 learning about Accessory Dwelling Units (also known as in-law units, granny flats, backyard cottages, etc). Beat that in terms of geekiness! (Okay, I bow … Continue reading
[update Nov. 2012: the paper, including updated results, is out in Appraisal Journal… click here] This year I’ve been working with appraiser Taylor Watkins of problem of appraising properties with … Continue reading
“Understanding and Appraising properties with Accessory Dwelling Units (ADUs)” – a free seminar December 16, 2011 in Portland
[EDITOR’S NOTE: this event has already occurred! For a synopsis of results, click here.] (for an emailable PDF of this invitation, click here) A presentation for real estate, building, and … Continue reading
(Update January 2013: please note that the research on which the following piece was based has now been published in Appraisal Journal. Please read the full text of that article … Continue reading
Accessory dwellings don’t often get a thorough discussion in the media these days, because most writers (and most Americans) are still getting used to the basic idea of them. We’re … Continue reading
I’m pretty much an obsessive planner when it comes to big projects. I researched and penciled out a lot of scenarios before I developed my garage into a little apartment, … Continue reading