Sarah Buchner, who grew up in a carpenter’s household in Austria and worked in construction herself, transformed her frontline experience into an AI startup that navigates the massive, fragmented data landscape of the construction industry. Her company, Trunk Tools, leverages advanced AI to streamline complex workflows and enhance safety on job sites across the U.S.
- Trunk Tools uses AI to manage 3-4 million pages of construction documents per project
- Founder Buchner combined construction experience with Ph.D. research in data science
- AI agents assist with contract review, safety incidents, and project cost impact analysis
What happened
Sarah Buchner grew up in a low-income family in Austria, learning carpentry from her father and working on construction sites from a young age. Her background as a blue-collar worker and later general contractor gave her firsthand insight into the complexities and safety risks inherent in the construction sector. After a fatal workplace accident on a site she managed, Buchner shifted her focus seriously toward improving safety by developing software solutions. This path eventually led her to pursue advanced data science and AI research centered on construction data challenges.
In 2019, Buchner moved to California to attend Stanford Graduate School of Business, founding Trunk Tools in 2021 during her studies. The startup initially struggled to find product-market fit but gained traction in 2023 by harnessing breakthroughs in large language models. Trunk Tools now builds AI agents that integrate across multiple data systems on construction sites, analyzing millions of pages of fragmented documentation to assist with workflows, contract reviews, inspections, and safety management.
Why it matters
Construction projects generate massive amounts of unstructured data dispersed across many platforms, making it difficult to aggregate and analyze using traditional methods. Trunk Tools addresses this by creating a unified AI-powered layer that interprets and connects information from contracts, drawings, submittals, and more. This capability helps contractors detect inconsistencies, evaluate change impacts, and enhance decision-making accuracy.
The AI’s ability to quickly surface critical information has real-world safety and financial implications. For instance, the system can calculate costly secondary effects of project changes, preventing unintended budget overruns—such as a nearly $4 million impact on a $100 million project. It also provides prompt guidance during on-site emergencies, exemplified when AI agents delivered immediate instructions after a chemical exposure incident, underscoring the life-saving potential of such technology.
What to watch next
As Trunk Tools expands its customer base in the U.S., primarily targeting general contractors and subcontractors, its AI platform’s integration with varied construction management systems will be critical to scaling impact. The company’s ability to further automate cross-functional workflows and safety protocols could drive widespread adoption, solving key inefficiencies and risks faced by the industry.
Investors and industry observers should monitor how advances in large language models continue to broaden Trunk Tools’ functionality and accuracy. Additionally, the startup’s expansion into partnerships with project owners and construction stakeholders beyond contractors could reshape project management by enabling more transparent, data-driven collaboration across the entire construction ecosystem.