sizeless

sizeless is an AI-powered documentation platform for civil engineering that turns a smartphone video of an open trench into the deliverables utilities and contractors are legally required to produce: a 3D model, CAD/BIM plans, and the quantities they bill from. It is built for network operators and construction teams working on civil engineering, district heating, and house connections who need precise 3D twins of open trenches and house connections delivered directly for GIS and CAD. The platform pairs a guided iPhone Pro capture app called SiteScan with processing that generates high-resolution 3D reconstructions, industry-standard as-built plans, and GIS-ready digital twins, so that a single scan produces every output a team already works with. The problem sizeless addresses is the gap between how fast underground infrastructure is built and how slowly it is documented. Producing compliant as-built documentation has traditionally taken months and required a surveyor, which means trenches must either stay open or be revisited, crews wait for separate surveying appointments, and the final record is assembled from manual sketches that end up in disconnected data silos. Because documentation lags behind construction, billing and cash flow slow down, and construction errors can go unnoticed until they are buried under backfill. sizeless moves documentation into the moment of excavation: the existing project team films the open trench themselves, and the required outputs are generated from that single capture, in hours rather than months. The workflow begins with trench capture. Using a standardized capture process on an iPhone Pro directly at the excavation, the existing project team records the open trench. No special hardware is required and no extra appointments have to be scheduled, which means documentation starts while the trench is still open rather than in a later, separate surveying visit. Because capture is carried out by the people already on site, the process does not depend on specialists being available, and technicians can document house connections independently via smartphone. The same guided approach is used by the SiteScan iPhone app to capture properties, trenches, and technical rooms in minutes. From that captured video, algorithms developed at ETH Zurich generate a high-resolution 3D point cloud of the open trench that is centimeter-accurate. The point cloud is the objective basis for earthwork volumes, dimensions, and audit trails, giving teams a measurable 3D reconstruction of the scanned space instead of a hand-drawn approximation. The reconstruction is interactive, so users can rotate and zoom through it to inspect the captured geometry. This continuous 3D evidence also covers third-party utilities and house entries, and it works without GPS in basement areas, which keeps documentation complete in places where positioning signals are unavailable. The capture then converts into a 2D CAD as-built plan in DWG/DXF, the industry-standard format for revision documentation. In these plans, couplings and pipes are quickly identified and measurement extraction is simplified, so the as-built record can be handed to the processes and tools that already consume CAD drawings. Alongside the 2D plan, sizeless produces a 3D model and digital twin of the pipe route including house entries, with seamless integration into GIS systems for future-proof planning and maintenance. Together these outputs mean one capture yields a 3D point cloud, 2D CAD, and BIM/GIS deliverables ready to drop into existing tools. sizeless describes its approach as a four-step AI-powered workflow. Step one is trench capture at the excavation by the existing project team. Step two is the generation of a centimeter-accurate 3D point cloud using algorithms developed at ETH Zurich. Step three is the production of 2D CAD as-built plans in DWG/DXF for revision documentation. Step four is the 3D model and GIS output that represents the pipe route as a digital twin, including house entries. The differentiating idea is that no surveyor and no special hardware are needed: the documentation is filmed by the crew themselves and turned into compliant deliverables from a single scan, which is why sizeless can produce documentation in hours where the traditional route takes months. The benefits follow directly from that workflow. Trenches can be backfilled immediately after the video, with no waiting for separate surveying appointments, and complete documentation is available weeks earlier, which enables faster billing and cash flow. Documentation is described as quality-assured and audit-proof, because the continuous 3D evidence eliminates manual sketches and data silos and allows construction errors to be identified before backfilling. Process autonomy is another stated outcome: technicians document house connections independently with a smartphone, and existing internal or external teams can handle a higher project volume through more efficient workflows, without specialists. The headline references include 72-hour documentation, DWG/DXF outputs, instant backfill, iPhone Pro capture, GIS-ready data, and higher throughput. Concrete use cases include documenting open trenches for civil engineering and district heating projects, capturing house connections and house entries, documenting third-party utilities encountered in the trench, and scanning properties and technical rooms with the SiteScan iPhone app. Because the outputs include as-built plans and quantities, the documentation also feeds revision documentation and the measurement quantities that contractors bill from. For network operators, the resulting digital twin of the pipe route integrates into GIS systems to support future planning and maintenance of underground infrastructure. The primary audience is network operators, utilities, and contractors active in civil engineering, district heating, and house connections, along with the existing field teams and technicians who carry out the work on site. Documentation is available through the web platform at sizeless.co, where users can book a demo, request an in-person demo, or see the workflow in action, and through SiteScan, the sizeless iPhone app available on the App Store. sizeless was founded by engineers from ETH Zurich and UC Berkeley and is backed by Y Combinator, ETH Zurich, UC Berkeley, Cambridge, and MIT. In summary, sizeless replaces months of surveying and manual sketching with an AI-powered, video-first documentation workflow for underground infrastructure. A single smartphone scan of an open trench becomes a centimeter-accurate 3D point cloud, DWG/DXF as-built plans, and a GIS-ready digital twin of the pipe route, giving utilities and contractors audit-proof documentation, faster backfill, faster billing, and greater process autonomy without special hardware or specialist surveyors.