Window system (9; 109; 209; 309) for a mobile home, a recreational vehicle or a caravan comprising a vehicle wall (2; 4), a blind frame (10; 110; 210; 310) and a casement (11; 311) that is movable relative to the frame, - wherein the vehicle wall (4; 204; 404) comprises an outer layer (6; 206; 306), a middle layer (7; 207; 30); 407) and an inner layer (8; 208; 308), - wherein the vehicle wall (4; 204; 404) comprises a cutout (5; 205; 305) passing through all the layers (6; 206; 306, 7; 207; 307; 407, 8; 208; 308), wherein the cutout (5; 205; 305) is delimited by a delimiting, in particular completely surrounding, flange edge of the vehicle wall (4; 204; 404), characterized in that - the outer layer (6; 206; 306) of the vehicle wall (4; 204; 404) protrudes over and de limits, in particular completely surrounds, the middle layer (7; 207; 307; 407) and the inner layer (8; 208; 308) in the cutout (5; 205; 305), or the outer layer (6; 206; 306) and at least one of the sections of the middle layer (7; 207; 307) adjacent to the outer layer (6; 206; 306) protrudes over and delimits, in particular completely surrounds, the inner layer (8; 208; 308) in the cutout (5; 205; 305), - the blind frame (10; 110; 210; 310) with a first delimiting, in particular completely surrounding, extension (23; 223; 323) with the interposition of a sealing means (24; 224; 324) on a delimiting, in particular completely surrounding, end face (6b; 206b; 306b) and/or on a delimiting, in particular completely surrounding, underside, abuts the outer layer (6; 206; 306), and - the blind frame (10; 110; 210; 310) with an underside (30c; 230c) of a second delimiting, in particular completely surrounding, extension (30; 230), flatly abuts a visible side (8c; 208c) of the inner layer (8; 208). - wherein the vehicle wall (4; 204; 404) comprises an outer layer (6; 206; 306), a middle layer (7; 207; 30); 407) and an inner layer (8; 208; 308), - wherein the vehicle wall (4; 204; 404) comprises a cutout (5; 205; 305) passing through all the layers (6; 206; 306, 7; 207; 307; 407, 8; 208; 308), wherein the cutout (5; 205; 305) is delimited by a delimiting, in particular completely surrounding, flange edge of the vehicle wall (4; 204; 404), - the outer layer (6; 206; 306) of the vehicle wall (4; 204; 404) protrudes over and de limits, in particular completely surrounds, the middle layer (7; 207; 307; 407) and the inner layer (8; 208; 308) in the cutout (5; 205; 305), or the outer layer (6; 206; 306) and at least one of the sections of the middle layer (7; 207; 307) adjacent to the outer layer (6; 206; 306) protrudes over and delimits, in particular completely surrounds, the inner layer (8; 208; 308) in the cutout (5; 205; 305), - the blind frame (10; 110; 210; 310) with a first delimiting, in particular completely surrounding, extension (23; 223; 323) with the interposition of a sealing means (24; 224; 324) on a delimiting, in particular completely surrounding, end face (6b; 206b; 306b) and/or on a delimiting, in particular completely surrounding, underside, abuts the outer layer (6; 206; 306), and - the blind frame (10; 110; 210; 310) with an underside (30c; 230c) of a second delimiting, in particular completely surrounding, extension (30; 230), flatly abuts a visible side (8c; 208c) of the inner layer (8; 208).