Answer: Mis padres estaban cocinando la cena cuando los invitados llegaron.
1. We have the architect that designs the layout and build of the house.
2. We have the contractor that contacts with the carpenters who usually are the ones building the house.
3. We have the carpenters who build the house.
4. We have the land surveyors that survey the land to make sure boundaries, and protocols are being followed.
There's some. You can also talk about interior designers that help finish the house on the inside regarding how you want your home to be.