GPR and EML detect different types of buried services — and neither is sufficient on its own for most UK construction sites. This guide explains what each method does, where each falls short, and why PAS 128 Type B specifies both in combination.

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.