Regulations for the routing and access of construction site vehicles

why shouldn't 3.5m be enough? Sure, it gets tight, especially when transporting prefab house parts that can sometimes cause overwidth/height. But they won't have more than 3.5m on the road either (otherwise, they wouldn’t be allowed to drive or it would be extremely expensive! So coordinate the situation with the GU/BU and ask. A crane space usually has 6x6m, but the (foldable) crane itself is only about 2.5m in the unassembled state. I wouldn’t worry about something that hasn’t happened yet ...

The 3.5 m is of course sufficient. But the driveway is too narrow. They can't get around there. I was already on site with the construction manager.

An alternative is to place the crane on the property and lift the prefabricated parts over the house in front. This would have to be done twice, as the basement and the prefab house are not from the same supplier. It is questionable whether trucks can drive away with soil or concrete mixers can access the site. I am expecting additional costs of more than 20,000 euros with this solution.

and to lift the prefabricated parts over the front house.

... with securing and evacuating the front house :)

I am expecting additional costs greater than 20,000 euros with this solution

then make the driveway wider and restore the original condition afterwards, a gate is planned, right?

our driveway was about 6m wide for maneuvering into a 3m construction road

3.5 m is of course sufficient. But the driveway is too narrow. They can’t get around there. I was already on site with the site manager.

An alternative is to place the crane on the property and lift the prefabricated parts over the house in front. The whole process twice, because the basement and the prefabricated house don’t come from the same source. It is questionable whether trucks can drive away with soil or whether concrete mixers can drive up. I expect additional costs of over 20,000 euros with this solution.

In my opinion, the owner of the house can refuse the shifting of loads over their property. Add that to your to-do list.

Strange why one has to build a prefabricated house in such an access situation. 3.5 m is no problem for normal construction vehicles. Traffic just stops while the truck reverses into the driveway. That’s quite normal here.