Atmos
DefunctYC S20San Francisco, US Β· Founded 2019 Β· 30 employees Β· 8 known investors
Atmos provides an online platform for managing the complete homebuilding workflow from start to finish.
Also known as Atmos (buildatmos.com)
Founders & leadershipΒ· Y Combinator alumni (S20)
Atmos was founded in 2019 by Nicholas Donahue, Trent Hedge, Matthew Rastovac, and Austin Kahn.
Investors Β· 8
Valuation Β· disclosed
Disclosed eventsSource: SEC prospectus filings, and round valuations the company or its investors disclosed β follow each entry's link for the claim.
Company profile
researched Aug 2026Atmos was a San Francisco-based housing and proptech company that offered the custom homebuilding process through an online platform. It was founded in 2019 and participated in Y Combinator's Summer 2020 batch, where it was categorized under housing and proptech and had a team size of 30. Aaron Epstein was listed as its primary Y Combinator partner.
The company's founding team consisted of Austin Kahn, Nicholas Donahue, Trent Hedge and Matthew Rastovac, the latter listed as Head of Engineering at Atmos. Y Combinator's directory lists these individuals as former founders and records the company's status as inactive.
Business model
Atmos operated an online platform covering the homebuilding process end to end.
Traction
Y Combinator lists a team size of 30 for the company.
βΈFull profile β market position, go-to-market, geography, history
Market position
Atmos was categorized by Y Combinator within the housing and proptech sectors and was backed by Y Combinator and Khosla Ventures.
Go-to-market
Individuals seeking to design and build custom homes.
Geography
Headquartered in San Francisco, California.
History
Atmos was founded in 2019 and went through Y Combinator's Summer 2020 batch. Press coverage of the company began in June 2020, when TechCrunch described its aim to make building a house a one-click effort. In October 2020, Forbes reported that the startup raised funds at a $25 million valuation, and TechCrunch reported an additional $4 million raise from Khosla Ventures, real estate strategic investors and TikTok creator Josh Richards. In September 2021, a founder was recognized on the Forbes 30 Under 30 2021 list as its youngest honoree. In November 2022, TechCrunch reported a $12.5 million raise for the YC- and Khosla-backed company to design custom homes. Y Combinator subsequently listed the company as inactive.
Compiled by commissioned research from 6 cited public sources β announcements, filings, and press listed under research sources below.
Key figures
latest reportedCompany-reported or press-reported figures, each dated to when it was claimed β not independently audited.
Founder mafia
3 people who came through Atmos went on to found or lead other companies.
Timeline Β· 4
launches, deals, and filingsTechCrunch reported that the Y Combinator- and Khosla-backed company landed $12.5 million.
$12.5M source β
Listed by Y Combinator as news coverage: Forbes 30 Under 30 2021: Youngest.
TechCrunch reported that the one-click housing startup raised another $4 million; separate Forbes coverage on October 20, 2020 reported the funding was raised at a $25 million valuation.
$4M source β
Atmos was part of Y Combinator's Summer 2020 batch, with Aaron Epstein as primary partner.
Dated company events from announcements, filings, and press; legal rows summarize public dockets and regulator releases.
In the news
Atmos Energy (ATO) Could Be 5% Undervalued Ahead Of Its Next Earnings Report - Simply Wall St Newssimplywall.st Β· Jul 2026βΈResearch sources Β· 6
primary sources listed
- Atmos Space Cargo raises $30 million for reentry missions - SpaceNewsspacenews.com Β· web
6 public sources were cited for this profile; the first-party ones are listed here.
Frequently asked questions
- What does Atmos do?
- Atmos was a San Francisco proptech startup that moved the custom homebuilding process online.
- Who founded Atmos?
- Atmos was founded by Nicholas Donahue, Trent Hedge, Matthew Rastovac, Austin Kahn in 2019.
- Who are Atmos's investors?
- Atmos's investors include Duke Capital Partners, Fjor Founders, Silicon Ventures, Vibe Capital, Wayfinder Ventures, Y Combinator, JLL Spark, Starship Ventures.
- Where is Atmos headquartered?
- Atmos is headquartered in San Francisco, US.