A method for controlling building of tyres for vehicle wheels, comprising: building a carcass structure on a forming drum (13a-13c); assembling the carcass structure to a crown structure; wherein building of the carcass structure comprises: building one intermediate portion of the carcass structure at a time on a respective forming drum (13a-13c) within an intermediate forming line; making available the forming drum with the intermediate portion of the carcass structure at a first transfer location; completing the intermediate portion of the carcass structure transferring the respective forming drum between the first transfer location, n completion locations (20, 21) with n≥1, and a second transfer location, in which the carcass structure is made available for subsequent assembling with the crown structure by unloading from the respective forming drum; transferring the forming drum clear of the carcass structure from the second transfer location to the first transfer location from which the forming drum proceeds along the intermediate forming line for building a subsequent intermediate portion of the carcass structure; wherein at an operating moment at which the first transfer location is occupied by a forming drum coming from the intermediate forming line or intended for the intermediate forming line, there are one to n locations selected from the n completion locations (20, 21) and the second transfer location that are occupied by respective forming drums. building a carcass structure on a forming drum (13a-13c); assembling the carcass structure to a crown structure; wherein building of the carcass structure comprises: building one intermediate portion of the carcass structure at a time on a respective forming drum (13a-13c) within an intermediate forming line; making available the forming drum with the intermediate portion of the carcass structure at a first transfer location; completing the intermediate portion of the carcass structure transferring the respective forming drum between the first transfer location, n completion locations (20, 21) with n≥1, and a second transfer location, in which the carcass structure is made available for subsequent assembling with the crown structure by unloading from the respective forming drum; transferring the forming drum clear of the carcass structure from the second transfer location to the first transfer location from which the forming drum proceeds along the intermediate forming line for building a subsequent intermediate portion of the carcass structure; wherein at an operating moment at which the first transfer location is occupied by a forming drum coming from the intermediate forming line or intended for the intermediate forming line, there are one to n locations selected from the n completion locations (20, 21) and the second transfer location that are occupied by respective forming drums. building one intermediate portion of the carcass structure at a time on a respective forming drum (13a-13c) within an intermediate forming line; making available the forming drum with the intermediate portion of the carcass structure at a first transfer location; completing the intermediate portion of the carcass structure transferring the respective forming drum between the first transfer location, n completion locations (20, 21) with n≥1, and a second transfer location, in which the carcass structure is made available for subsequent assembling with the crown structure by unloading from the respective forming drum; transferring the forming drum clear of the carcass structure from the second transfer location to the first transfer location from which the forming drum proceeds along the intermediate forming line for building a subsequent intermediate portion of the carcass structure; wherein at an operating moment at which the first transfer location is occupied by a forming drum coming from the intermediate forming line or intended for the intermediate forming line, there are one to n locations selected from the n completion locations (20, 21) and the second transfer location that are occupied by respective forming drums.