Construction remains the sector with the highest number of workplace deaths in Great Britain, and falls from height account for around half of them. The Construction (Design and Management) Regulations 2015 are the framework: the client, principal designer and principal contractor carry named duties, every project needs a construction phase plan, and larger projects are notified to the HSE on an F10.
On site the risks are well known and still kill people: work at height, excavations and temporary works, moving plant and vehicles, structural collapse during demolition and refurbishment, silica dust, asbestos in pre-2000 buildings and manual handling. The controls are known too, which is why HSE inspectors treat a fall from an unprotected edge as a failure of management, not luck.
Housing development adds its own pattern: many small sites or one large one built in phases, a long tail of subcontractors, plots handed over while others are still being built, and the public living next to the work. What separates a well-run site from a lucky one is the paperwork being real: RAMS that describe the actual task, inductions and toolbox talks that reach the people doing it, inspections at the intervals the regulations set, and a principal contractor who knows what every subcontractor is doing that day.