Design of the new Volunteers Head office, located in San Prospero (IT). The building has a plan with an “L” shape, it is entirely prefabricated and develops on two floors with a total height of 9,8 m. The main features of the building are the roof and a cantilever. The roof has different slopes and it’s realized with multibox panels made of spruce. The cantilever is located at an end of the building and its length is greater than 2 m. The multifunctionality of the different parts of the building, which is thought to have some rooms suitable for residential other spaces intended to be garages for ambulances, asked us to pay attention to the fire resistance requirements (R60 for the garages). Nevertheless this aspect didn’t stop us from building the Head Office completely in wood and this was possible using 5 layers CLT panels of different thicknesses, 100-120-160mm.