A kit (200) for producing an installation niche (100), in particular for sanitary rooms, comprising - A coherent material blank (15; 35) for producing a niche insert (20) which is open on one side and which comprises a rear wall (10) and at least three side walls (11) and - A flange frame (12) which can be placed on a free edge (13) of the side walls (11), characterized in that the material blank (15; 35) comprises at least one wear layer (18) which in the assembled state of the installation niche (100 ) forms a finished inner surface (17) which is visible in the installed state.
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