Table of contents


The spark that started Double Union was AdaCamp San Francisco, a feminist unconference in June 2013. At that event, a group of women came together to talk about starting feminist makerspaces where women’s needs are prioritized. Among them was Leigh Honeywell, who had just co-founded Seattle Attic, a feminist makerspace in Seattle, who freely shared her experience and tips for starting a new makerspace. Several women, including Double Union co-founders Amelia Greenhall, Valerie Aurora, and Liz Henry, were inspired to start a similar space in San Francisco. Our inspiration: “What if we had a space that felt like AdaCamp all year round?” They decided to create a space with the primary mission of being a comfortable and welcoming place for women to work on their projects.

After AdaCamp, about 10 women started meeting weekly at each other’s homes to brainstorm. Throughout the summer, they created and documented their shared values, raised money amongst themselves and people they knew, incorporated as a 501(c)(3) non-profit, adopted bylaws (largely based on those of The Ada Initiative), selected a board, got a bank account, and set up various kinds of online infrastructure. In October 2013 the board signed a lease on a space in the Fog Building, at 333 Valencia St in the Mission. After ripping out the carpets, building shelves and workbenches, and taking out the ceiling tiles to reveal hidden skylights, Double Union began accepting new members. In October 2015, we moved to a new space in Potrero Hill at 1250 Missouri St. #111.

Double Union began with the membership gender criteria of people who "identify as a woman in a way significant to them". In January 2018, we expanded this to "identify as a woman or non-binary person in a way significant to them".

Double Union calls itself a hacker / maker space, because our mission is to create a space where women and non-binary people can feel equally comfortable knitting, coding, drawing, or using power tools and no one feels pressure to prove they belong here. We’re creating a culture where we don’t just make awesome stuff - we also ask questions, feel confused sometimes, and break things.

Another value we hold at Double Union is the idea that clearly defined structures and boundaries help create safer spaces. We have a shared anti-harassment policy and a list of base assumptions for members.

Double Union’s decision-making structure is heavily influenced by Jo Freeman’s The Tyranny of Structurelessness and has evolved over time as the organization has grown. At first, the people meeting informally made a lot of the founding decisions. After a couple of months, three people volunteered to incorporate Double Union and became the board of directors, responsible for making legal, financial, and high-level decisions. We also created the position of voting member, to decide on new member applications and take on higher-level responsibilities within the organization. A few weeks later, we created committees to make decisions about specific areas like screen printing and electronics. After about a year, we created committees to formalize and document all of our official and de-facto decision-making policies. We also paid multiculturalism and inclusion consultants about 15% of our annual budget to advise us on making Double Union more welcoming to a wider variety of women and non-binary people.

Decisionmaking at Double Union

We have a members-only mailing list and internal chat system where we propose and discuss things, and we have members meetings about once a month. This usually results in decisions without a formal process being necessary. Groups of 2+ members interested in a topic form committees, to run events or be in charge of some aspect of the space's operation.

Our committees can be about a topic, such as bicycles or zinemaking. We also have several committees related to running Double Union together, such as developing our web applications, membership coordination, and updating our social media.

If something is hard to decide, controversial, or otherwise needs a final decision, our small board makes the decision. We don't want to get stuck in endless discussions; having a board avoids that problem. The board also does the legal and financial decision making involved in being a non-profit.



Carmen Jackson, Board Member, Secretary

Carmen is fascinated by the relationships people have with their computers. When not working as a software engineer, she rides horses, lifts weights, organizes events, reads, and hikes. She has previously served on the Board of Directors of Bay Area Derby, and joined Double Union’s board after volunteering for a year as a Membership Coordinator.

Dani arias

Daniela (Dani) Arias, Board Member, Treasurer

Dani is a Certified Public Accountant by day and loves playing with spreadsheets and mentoring women in business. She spends her free time biking, hiking, working on sewing projects, and enjoying the sounds of high hats, beeps, boops, and clickety-doops.


Below are some of the tools and activities you can find at Double Union!


Sewing and Fiber Arts





Silk screening

Silk Screening Tools

3d printer and cnc

3D Printer and CNC

Hand tools

Hand Tools

Button maker

Button Maker




Tea, Coffee, and Mugs