GNSS is fast and effective across large open sites. A total station is precise and works where satellite signal can't reach. On most UK construction projects both are needed — this guide explains when to use each and how they work together.

Most variation claims don't arise because something genuinely unexpected happened — they arise because accurate existing condition data wasn't captured before works began. This guide makes the commercial case for 3D scanning: pre-construction surveys, as-built verification, and what the data protects on UK construction and infrastructure projects.