"All trades" is not my preferred translation for this term as a rule, but given that you give it as a title only (probably difficult to give fuller context), it is my suggestion here (as a title, it should be "touS corps d'état", presumably).

A "corps d'état" is a building trade: painting, plumbing, electricity, heating, ventilation and air conditioning, lifts, joinery, floor coverings, etc.

It may also be possible to translate it as "complete fitout", meaning everything above and beyond the "shell" or "carcase" of a building (concrete, steel, timber, or masonry walls, floors and roof).

It is often used in expressions such as "construction tous corps d'état" to mean "complete construction and fitout", i.e. a building project from go to whoa.