I work for an Engineering Consultancy, and all of the jobs we are involved in are still running, albeit, mainly large scale and schools. The housing sector has pretty much ceased though. As you said, where it's safe, they are to continue, unless the Site Manager or Client deem otherwise. We are still expected to be doing site visits and snagging etc, though obviously in safe, minimal numbers, rather than the whole team rocking up at once. Using AR/camera fitted hard hats and similar technologies, some surveys are able to be conducted from home, with just one person on site with the tech, while others view and comment from home.