- Assembly of technical work packages and architectural work packages in a building constituted by at least one zone constituting the space in which the interior layout is modifiable, said architectural work packages comprising architectural items constituting means for limiting the physical spaces, said architectural items comprising removable partitions (202.1) which constitute cell separation means, said assembly comprising a circulation space constituting a main distribution means common to all the networks of goods and persons, referred to as passive, constituted by the spaces defined by the architectural items, and said assembly comprises a fixing system comprising a set of fixing means, wherein said fixing system is a fixing system whose fixing means consist of fixing lines distributed substantially parallel and at regular intervals in said zone, said lines constituting supports for repositionable fixing means between said shared fixing lines and removable partitions (202.1), characterised in that: the main distribution means constituted by the circulation space is characterised by a median distribution line of the passive network of goods and persons, referred to as the axis, and is also common to all the technical networks, referred to as active, constituted by technical items included in the technical work packages, said main distribution means comprising a main distribution means for the active networks, consisting of all the source network lines required for the technical operation of the various spaces constituting the interior of said zone and of each of the smallest physical spaces of standardised size defined by said architectural items constituting a cell, said network lines being arranged in an in-line topology with branch connections; each of the technical items of the active networks coming from one of the lines of the source network of a main distribution means for the active networks corresponds with a single cell and/or passing through a secondary distribution means, corresponds with at least two cells of a single group of cells, each cell or each group of cells being separated from the contiguous cells or groups of cells by physical boundaries which cannot be crossed by any network terminal distribution item of the contiguous cells, except with the cell that constitutes the circulation space, the boundary of which can be crossed by the network terminal distribution items connecting the technical items specific to each cell to the network lines necessary for said cell; and said fixing system is a shared fixing system and the fixing lines are shared fixing lines, said lines constituting the supports for repositionable fixing means between said shared fixing lines and each of the architectural items and each of the constituent technical items of the active networks required for the interior layout, said repositionable fixing means making it possible to hold in space any of the architectural items and said constituent technical items of the active networks and other technical items either directly or with complementary fasteners specific to said architectural items and technical items. the main distribution means constituted by the circulation space is characterised by a median distribution line of the passive network of goods and persons, referred to as the axis, and is also common to all the technical networks, referred to as active, constituted by technical items included in the technical work packages, said main distribution means comprising a main distribution means for the active networks, consisting of all the source network lines required for the technical operation of the various spaces constituting the interior of said zone and of each of the smallest physical spaces of standardised size defined by said architectural items constituting a cell, said network lines being arranged in an in-line topology with branch connections; each of the technical items of the active networks coming from one of the lines of the source network of a main distribution means for the active networks corresponds with a single cell and/or passing through a secondary distribution means, corresponds with at least two cells of a single group of cells, each cell or each group of cells being separated from the contiguous cells or groups of cells by physical boundaries which cannot be crossed by any network terminal distribution item of the contiguous cells, except with the cell that constitutes the circulation space, the boundary of which can be crossed by the network terminal distribution items connecting the technical items specific to each cell to the network lines necessary for said cell; and said fixing system is a shared fixing system and the fixing lines are shared fixing lines, said lines constituting the supports for repositionable fixing means between said shared fixing lines and each of the architectural items and each of the constituent technical items of the active networks required for the interior layout, said repositionable fixing means making it possible to hold in space any of the architectural items and said constituent technical items of the active networks and other technical items either directly or with complementary fasteners specific to said architectural items and technical items.