Defence Construction Service (), short just "FBT", is a Level.I authority, directly under the Danish Ministry of Defence. It is the authority that handles all construction and building projects for all other authorities under the Danish Ministry of Defence. It does not actually do the building itself, but rather is the project manager and works out all the plans on how it should be done and who should do it. The Service is split into several divisions and is housed in Viborg and Copenhagen. FBT also does projects for civilian companies and other ministries in the Danish government.