Which garden outdoor works are possible before moving in?

And even if they stick to it, in the next X years everything will look different anyway than in the final size ;)

Sure! We are already digging up and thinning out ;) Lupines have taproots that loosen the soil where the excavators have compacted everything. Later we plowed, the plant then remains lying there and fertilizes the soil. Especially now, when the sun also leaches the soil, a good mulch alternative. If everything is already level at your place in the back, then you can already outline your beds 1:1 with stones.