Series 1 is the model family behind Ground, Site, and Dwell. It's the part of Lestrade that reads a planning document, a certification, or a sales ledger the way someone who has spent twenty years in construction would read it, and it is now running on live projects across the country.
One engine, three products
For most of its life, software built for construction has been a database with a nicer interface: somewhere to log a certificate, store a drawing, or track a plot status. It has been very good at holding information and not very good at understanding it, which is why so much of the real decision-making in this industry still happens off-system, in someone's head or in a spreadsheet nobody else can read. Series 1 is Lestrade's attempt to close that gap. It is a single underlying model family, trained on the documents, workflows, and vocabulary of the built environment, that three different products draw on for three different jobs.
Ground uses Series 1 to read a site before anyone has visited it, pulling planning constraints, access routes, and comparable sites into a single score a committee can actually act on. Site uses the same underlying model to track who is qualified to be on a job, cross-referencing certifications against real work happening in real time, instead of a spreadsheet someone updates once a quarter. Dwell uses it to carry a plot from reservation through to the customer living in it, flagging the small things, a missed snag, a certificate about to lapse, before they become a complaint. Different screens, different users, same engine underneath.
Built to be easy to integrate
A model trained on construction data is only useful if the people who build construction software can actually get it into their own systems, which is why Series 1 was built API-first rather than as a walled-off product. It sits behind a small number of well-documented endpoints: send it a document, a certificate, or a site record, and it returns a structured, plain-English answer, not a black box score with no explanation attached. Teams that already run their own site management tools, CRMs, or ERPs are integrating Series 1 directly into those systems rather than replacing them, usually inside a sprint or two rather than a quarter-long rollout. That was the brief from the start: AI that's easy to integrate, simple to use, and improves how people already work, rather than asking them to change how they work to fit the software.
That also shapes how the model explains itself. Every output carries the reasoning behind it, which site record or clause it drew from, so a land director or a site manager can check Series 1's working the same way they'd check a colleague's, rather than being asked to trust a number with nothing underneath it. In an industry where a wrong call can mean a missed safety issue or a site bought on bad information, that explanation is not a nice-to-have. It is the feature that makes the rest of it usable.
Already on site
Series 1 is not a lab demo. It is processing bid documents for land teams deciding whether a site is worth pursuing, checking workforce qualifications on active construction sites before a trade is let through the gate, and carrying plot records from reservation to handover on live developments. Developers at housebuilders and contractors around the country are building against the same API, each solving a slightly different problem. One team wired it into an existing bid pipeline so appraisals surface automatically when a new site lands. Another used it to replace a manual qualification check that used to take a site manager half a morning with something that now takes seconds at the gate. None of that required Lestrade to build a new interface for them. It required the model to be good enough, and open enough, to sit inside the tools they already had.
What ties those deployments together is scale that would have been impractical to reach by hand. A regional contractor running Site across a handful of live sites is checking thousands of qualifications a week without adding headcount to do it. A housebuilder running Ground across its land pipeline is scoring every opportunity that lands on its desk, not just the ones a junior analyst had time to get to before Friday. That is the actual promise of Series 1: not a cleverer interface, but the built environment finally getting the kind of coverage that other industries have had for years.
What's next
Series 1 is a starting point, not a finished product. Every certificate it reads, every score a committee agrees or overrides, and every plot it tracks through to completion feeds back into the next version, which is why the name has a number on it. The three products it powers today, Ground, Site, and Dwell, are the first applications of it, not the limit of it. If you're building something in or around construction and want to see what plugging into it looks like, the team behind it is a message away.