A method for providing at least a part of a building, comprising the steps of: (a) prefabricating a module by: (i) assembling four walls extending between a floor and a roof to form a rectangular cuboid shape, said module being constructed as a load-bearing structure having said four walls provided with a planar wooden core element adjacent to at least one insulation layer, (ii) providing at least one compartment within said cuboid shape, (iii) creating a wet area within said module by providing waterproof layers on the interior sides of the walls and the floor of said compartment, (iv) arranging technical installations (16, S) within said cuboid shape, (v) providing interior equipment (150, 152) within said cuboid shape, (vi) providing the prefabricated module with pre-mounted engagement means for later engagement with prefabricated panels or slabs or other prefabricated modules by means of connecting devices, and (vii) providing a service space on top of or at the bottom of the module by assembling said four walls extending between said floor and said roof such that the upper edges of said four walls extend beyond the outer surface of the roof, or such that the lower edges of said four walls extend beyond the outer surface of the floor, said service space providing access to a coupling means end of at least one technical installation; (b) prefabricating a plurality of panels (4, 6) and slabs, each of which being constructed as a load-bearing structure provided with a wooden core element adjacent to at least one insulation layer, (i) providing each prefabricated panel (4, 6) and slab with pre-mounted engagement means for later engagement with a prefabricated module or another panel or slab by means of connecting devices; and (c) connecting said plurality of panels (4, 6) and slabs to a lateral side of said module - by means of said engagement means and connecting devices - for providing said part of a building such that said lateral side of said module together with said plurality of prefabricated panels (4, 6) and slabs form a further rectangular cuboid shape. (a) prefabricating a module by: (i) assembling four walls extending between a floor and a roof to form a rectangular cuboid shape, said module being constructed as a load-bearing structure having said four walls provided with a planar wooden core element adjacent to at least one insulation layer, (ii) providing at least one compartment within said cuboid shape, (iii) creating a wet area within said module by providing waterproof layers on the interior sides of the walls and the floor of said compartment, (iv) arranging technical installations (16, S) within said cuboid shape, (v) providing interior equipment (150, 152) within said cuboid shape, (vi) providing the prefabricated module with pre-mounted engagement means for later engagement with prefabricated panels or slabs or other prefabricated modules by means of connecting devices, and (vii) providing a service space on top of or at the bottom of the module by assembling said four walls extending between said floor and said roof such that the upper edges of said four walls extend beyond the outer surface of the roof, or such that the lower edges of said four walls extend beyond the outer surface of the floor, said service space providing access to a coupling means end of at least one technical installation; (i) assembling four walls extending between a floor and a roof to form a rectangular cuboid shape, said module being constructed as a load-bearing structure having said four walls provided with a planar wooden core element adjacent to at least one insulation layer, (ii) providing at least one compartment within said cuboid shape, (iii) creating a wet area within said module by providing waterproof layers on the interior sides of the walls and the floor of said compartment, (iv) arranging technical installations (16, S) within said cuboid shape, (v) providing interior equipment (150, 152) within said cuboid shape, (vi) providing the prefabricated module with pre-mounted engagement means for later engagement with prefabricated panels or slabs or other prefabricated modules by means of connecting devices, and (vii) providing a service space on top of or at the bottom of the module by assembling said four walls extending between said floor and said roof such that the upper edges of said four walls extend beyond the outer surface of the roof, or such that the lower edges of said four walls extend beyond the outer surface of the floor, said service space providing access to a coupling means end of at least one technical installation; (b) prefabricating a plurality of panels (4, 6) and slabs, each of which being constructed as a load-bearing structure provided with a wooden core element adjacent to at least one insulation layer, (i) providing each prefabricated panel (4, 6) and slab with pre-mounted engagement means for later engagement with a prefabricated module or another panel or slab by means of connecting devices; and (i) providing each prefabricated panel (4, 6) and slab with pre-mounted engagement means for later engagement with a prefabricated module or another panel or slab by means of connecting devices; and (c) connecting said plurality of panels (4, 6) and slabs to a lateral side of said module - by means of said engagement means and connecting devices - for providing said part of a building such that said lateral side of said module together with said plurality of prefabricated panels (4, 6) and slabs form a further rectangular cuboid shape.