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Accessory Dwelling Units (aka “granny flats”)
The following information was presented to the Arlington Redevelopment Board in October, 2020 by Barbara Thornton, TMM, Precinct 16
This Article proposes to allow Accessory Dwelling Units, “as of right”, in each of the 8 residential zoning districts in Arlington.
Why is this zoning legislation important?
Arlington is increasingly losing the diversity it once had. It has become increasingly difficult for residents who have grown up and grown old in the town to remain here. This will only become more difficult as the effects of tax increases to support the new schools, including the high school, roll into the tax bills for lower income residents and senior citizens on a fixed income. For young adults raised in Arlington, the price of a home to buy or to rent is increasingly out of reach.
Who benefits from ADUs?
What authority and established policy is this built on?
Arlington’s Master Plan is the foundational document establishing the validity and mission for pursuing the zoning change that will allow Accessory Dwelling Units.
Under Introduction in Part 5, Housing and Residential Development, the Master Plan states: Arlington’s Master Plan provides a framework for addressing key issues such as affordability, transit-oriented residential development, and aging in place.
The Master Plan states that the American Community Survey (ACS) reports that Arlington’s housing units are slightly larger than those in other inner-suburbs and small cities. In Arlington, the median number of rooms per unit is 5.7. There is a great deal of difference in density and housing size among the different Arlington neighborhoods. The generally larger size of homes makes it easier to contemplate a successful move to encourage ADUs.
What do other municipalities do?
According to a study (https://equitable-arlington.org/2020/02/16/accessory-dwelling-units-policies/), by 2017 65 out of 101 municipalities in the greater Boston (MAPC) region allowed Accessory Dwelling Units by right or by special permit. The average number of ADU’s added per year was only about 3. But by 2017, Lexington had 75 ADUs and Newton had 73. Both of these communities were among about 10 “as of right” municipalities in the MAPC region. This finding suggests that communities with more restrictions are less likely to see any significant affordable housing benefits.
Even in the midst of a housing crisis in this region, according to Amy Dain, housing expert, (https://equitable-arlington.org/2020/02/18/zoning-for-accessory-dwelling-units/) most municipalities still have zoning laws that restrict single family home owners from creating more affordable housing.
And this is despite the fact that, as according to Banker & Tradesman, March 10, 2020: https://www.bankerandtradesman.com/63-percent-in-greater-boston-back-adus/, 63% of people in the region approve of ADUs. California has recently passed strong pro-ADU legislation. A study by Zillow further corroborated this strong interest in communities across the US, including our region. https://equitable-arlington.org/2020/03/10/adu-popularity/.
Learn more about Accessory Dwelling Units/ “Granny Flats” here: https://planning.org/knowledgebase/accessorydwellings/
This timely report on the question of affordable housing vs. density comes from the California Dept. of Housing & Community Development and mirrors the situation in the region surrounding Arlington MA.
Housing production has not kept up with job and household growth. The location and type of new housing does not meet the needs of many new house- holds. As a result, only one in five households can afford a typical home, overcrowding doubled in the 1990’s, and too many households pay more than they can afford for their housing.
Myth #1
High-density housing is affordable housing; affordable
housing is high-density housing.
Fact #1
Not all high density housing is affordable to low-income families.
Myth #2
High-density and affordable housing will cause too much traffic.
Fact #2
People who live in affordable housing own fewer cars and
drive less.
Myth #3
High-density development strains public services and
infrastructure.
Fact #3
Compact development offers greater efficiency in use of
public services and infrastructure.
Myth #4
People who live in high-density and affordable housing
won’t fit into my neighborhood.
Fact #4
People who need affordable housing already live and work
in your community.
Myth #5
Affordable housing reduces property values.
Fact #5
No study in California has ever shown that affordable
housing developments reduce property values.
Myth #6
Residents of affordable housing move too often to be stable
community members.
Fact #6
When rents are guaranteed to remain stable, tenants
move less often.
Myth #7
High-density and affordable housing undermine community
character.
Fact #7
New affordable and high-density housing can always be
designed to fit into existing communities.
Myth #8
High-density and affordable housing increase crime.
Fact #8
The design and use of public spaces has a far more
significant affect on crime than density or income levels.
See an example of a “case study” of two affordable housing developments in Irvine CA, San Marcos at 64 units per acre.
San Paulo at 25 units per acre.
Both are designed to blend with nearby homes.
(DRAFT – 7/11/2019)
Arlington Planning Department officials report on options for the Town to mitigate the effects of housing demolitions and housing replacements in neighborhoods.
Evidence suggests that lack of appropriate regulatory policies have led to incidences of “mcmansions” and other issues that concern neighborhood residents. This study looks at the data, the policy and regulatory options for Arlington. It also looks at how comparable nearby communities have managed similar circumstances.
This 42 page report covers a great deal of data and analysis of homes by zoning district, gaps in the effectiveness of the current regulatory structure, affects on affordability in Arlington by zoning district, information on housing prices and sales, etc.
“Best practices” include descriptions of demolition delay, expansion of local historic districts, neighborhood conservation districts, design review standards and guidelines and possible revisions to the regulatory framework in Arlington. The report also includes interesting case examples of how comparable communities near Arlington handle these issues.
This report was presented to the Arlington Select Board on July 22.
Read the complete report and see the available data and tables.
Jennifer Susse authored this letter on January 20, 2020. Ms. Susse is a member of the Arlington School Committee and a Town Meeting Member. She closely follows the costs and demographic trends of school enrollment and of Town finances.
I write in support of efforts to increase housing in Arlington, both as a resident and as a member of the School Committee. I support these efforts not in spite of their potential effects on our schools, but because of their potential effects on both schools and town.
I have often spoken to the community about our rapid enrollment growth — over 2,000 students added in the last 25 years, 60 percent of those in the last 10 years. Because of these large enrollment increases the Arlington Public Schools have had to add capacity, which the town has generously supported. So how can I be in favor of adding more housing to Arlington, and thus potentially adding even more students to our already stressed school facilities?
Losing diversity
I will get to the capacity issue in a bit, but first I want to point out that in the last 30 years Arlington has lost both economic and generational diversity. The story about the loss of economic diversity is well known; the loss of generational diversity less so.
Between 1990 and 2010, the percentage of residents between 20 and 34 dropped from 28 percent to 17 percent. During that same period, the population over 65 dropped from 18 percent to 16 percent. What replaced these demographic groups were primarily residents between the ages of 35 and 54 and 0 and 14. In other words, mostly families with school-aged children. The loss of both types of diversity weakens the fabric of our community. However, the loss of generational diversity also weakens the town’s finances.
The average cost to the town of an additional student is about $8,500, a number that includes what’s known as the Enrollment Growth Factor (the amount that the town gives to the schools for each additional student in the system, currently at 50 percent of the per pupil cost of the preceding year, or $7,297), as well as the average cost of the benefits that the town pays for new hires.
What this means is that during the time a household has children in the school system, it is likely receiving more in benefits than it pays in taxes. For the town’s finances to work, we also need people who do not have children to live and pay taxes in Arlington, including young adults and older adults for whom Arlington is becoming less affordable because of condo conversions, teardowns, etc.
Overcrowded classrooms
But what about our overcrowded classrooms? The answer is that given the type of housing likely to be created on the main corridors, and the timing of that housing construction, I am not worried about further stresses to our school facilities.
By the time new housing is built, our elementary-aged population will likely be in modest decline. Five to 10 years out we expect to see enrollment stabilize at the middle and high school levels as well. That does not mean that we will have tons of extra space; just that we will no longer be in danger of taking over art, music, and literacy rooms for general classroom use.
Enrollment projections made by Dr. Jerome McKibbin in 2015 have so far been fairly accurate. His revised projections show that, without additional housing, we are expected to have 350 fewer elementary-aged students in the Arlington Public Schools 12 years from now than we have today.
The discussion about housing in Arlington reminds me of the discussion a few years ago over the Affordable Care Act. At that time, there was a lot of anxiety about potential changes to the health-care system, but insufficient appreciation (in my opinion) of the then current trends.
Zoning changes
Any discussion of zoning changes in Arlington must take an honest look at where we are now, and the direction we are headed in if there were no zoning changes. Our current trends have us losing natural affordability and economic and demographic diversity because of teardowns, condo conversions and sharp price increases. We don’t have the option to freeze Arlington as we know it today (or 10 years ago) in place.
In closing, I would like to say that I am proud of our excellent schools and strongly believe that families who have recently moved to Arlington have strengthened our community, but I do not want Arlington to become a place where people move in with toddlers and move out soon as their children graduate from high school. The current trends have us losing both economic and generational diversity, which threatens not only our community and civic life, but our financial health as well. Adding more and diverse housing can help.