Where are coach houses in Chicago

Published on Mar. 4, 2019 by Steven Vance


Over 1,225 people have signed the petition to re-legalize coach houses, rear houses, and other accessory dwelling units. Several aldermanic candidates who said they support it won, or will be in a runoff. I am still trying to contact those who haven’t yet said they support the re-legalization. I have heard that Mayor Emanuel will introduced draft legislation to City Council this month, and I’m excited to see what policy the planning department proposes.

And City Open Workshop has adopted a single project for its sixth season: educating people and community groups about ADUs. Last month we hosted a simulated community meeting (read the recap) to generate ideas on how people might respond to proposals for new ADUs in their neighborhoods, and I presented my coach house counting method.

Anjulie Rao, an architecture writer and editor of Chicago Architect magazine, acted as the architect of a proposed coach house in Avondale. The designs on the screen behind her were created by Wheeler Kearns.

The final goal of the workshop is to produce a community clinic for neighborhood-based organizations to hear about ADU policy, the benefits of allowing ADUs in a neighborhood, and learn and discuss ways to address affordability, noise, vacation rental, and other concerns. There are some exciting ways that jurisdictions and organizations around the country (look at what LA Más is doing in Los Angeles) are trying to ensure that ADUs are affordable.

My ideal ADU policy in Chicago is that two ADUs are allowed in every R-zoned lot, with no parking requirement, and the ADUs can be in an existing building or in a new building (a 2-flat rear house or a 1-unit coach house + basement unit in the front house, to give two examples). This would legalize existing basement, attic, and illegally built coach houses. New buildings couldn’t be taller than existing buildings, but they could be larger and even in the front of the lot if it doesn’t have a front house (like this one in East Garfield Park).

The city policy would be combined with a multi-lingual building permit and “homeowner advocate” program at the Department of Buildings; there could be pre-permitted prototype designs for off-the-shelf new construction, designed by local architects who would be paid with a willing foundation’s grant money and sustained with a small licensing fee that the homeowner would pay — to reduce construction and permitting costs.


Now, where are they?

Last August I developed a simple but imperfect method to count the number of existing coach & rear houses in Chicago: Using the City’s building footprints map, augmented by newer data on OpenStreetMap, I could count the number of buildings that had the same address as a second building. In other words, the coach/rear house had the same address as its front building.

I reviewed 27 randomly selected pairs of buildings and found half were coach or rear houses. Others were buildings part of the same church, and two were stadium bleachers at Hanson Park. Some buildings were hard to identify — is this a tent or a structure in between a house and a garage in Humboldt Park?

Since then, Jimm Dispensa has reviewed all of the approximately 3,138 building pairs this method identified and found that about 77 percent of them are coach or rear houses. One major caveat: This method can’t count other ADUs in Chicago, like basement and attic apartments.

That means we have about 2,416 coach & rear houses in Chicago, given the available data and validation method.

Where are they distributed?

As long as you remember that the number of counted coach & rear houses isn’t accurate, I can share with you this list of the top 11 community areas:

The data can be improved by anyone by removing addresses from non-coach houses in OpenStreetMap or by adding addresses to buildings that can be correctly identified as coach or rear houses.


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More reasons to support re-legalizing coach houses & ADUs in Chicago
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What a local architecture firm thinks Chicago coach houses could look like

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