Firstly, and it may seem obvious, but you should accept in the process of completing your conservatory building work, the area where the conservatory is to be constructed is going to be a mini-building site for a while.
It’s not just the immediate vicinity that can be affected as the builder will require a working area around the new conservatory. That’s why it’s a good idea to incorporate some paving around the new structure into your design, to hide any damage to your lawn.
Your builder will need to excavate the ground and remove spoil possibly into a skip on your driveway but the surface of the driveway should be protected. Also, concrete for the foundations and floor will be moved, normally by wheelbarrow from the front to the rear.
A good builder will always tidy up after himself but as the saying goes, ‘you can’t make an omelette without breaking a few eggs’. The conservatory building work site should be left in a safe condition overnight and at weekends when your builder is not there, for good health and safety practice.