An apparatus for mounting first and second panels (26, 28) to a façade, the first and second panels (26,28) each possessing a face, and an opposite undersurface, the apparatus comprising: a base, said base comprising a plate and first and second flanges (16, 18) extending outwardly from said plate, said first and second flanges (16, 18) forming an open channel therebetween, each of said first and second flanges (16,18) comprising a resilient leg (30,32) extending inwardly toward said channel; a fixing element for holding said base to the facade; a fastener, said fastener comprising a basal portion and first and second arms (40, 42)projecting from said basal portion; characterised by a first extension element connected to said first panel by a first connector and a second extension element being connected to said second panel by a second connector, said first and second extension elements (54,62) possessing first and second platforms (64,88), respectively, and being supported by said plate of said base, said first and second platforms (64,88) being positioned apart from each other and adjacent the faces of the first and second panels (26, 28); said basal portion further comprising a first inclined surface and a second inclined surface, each of said first and second inclined surfaces (38,39) being angled relative to a plane passed through said plate, said first and second arms (40,42) including first and second contact surfaces (44,46), respectively, for being positioned directly on said first and second platforms (64,88) of said first and second extension elements (54, 62), respectively, said first inclined surface of said basal portion being dimensioned to slide on said resilient leg of said first flange and said second inclined surface of said basal portion being dimensioned to slide on said resilient leg of said second flange upon rotation of said basal portion in said channel of said base, said rotation of basal portion forcing said basal portion into said channel of said base. a base, said base comprising a plate and first and second flanges (16, 18) extending outwardly from said plate, said first and second flanges (16, 18) forming an open channel therebetween, each of said first and second flanges (16,18) comprising a resilient leg (30,32) extending inwardly toward said channel; a fixing element for holding said base to the facade; a fastener, said fastener comprising a basal portion and first and second arms (40, 42)projecting from said basal portion; characterised by a first extension element connected to said first panel by a first connector and a second extension element being connected to said second panel by a second connector, said first and second extension elements (54,62) possessing first and second platforms (64,88), respectively, and being supported by said plate of said base, said first and second platforms (64,88) being positioned apart from each other and adjacent the faces of the first and second panels (26, 28); said basal portion further comprising a first inclined surface and a second inclined surface, each of said first and second inclined surfaces (38,39) being angled relative to a plane passed through said plate, said first and second arms (40,42) including first and second contact surfaces (44,46), respectively, for being positioned directly on said first and second platforms (64,88) of said first and second extension elements (54, 62), respectively, said first inclined surface of said basal portion being dimensioned to slide on said resilient leg of said first flange and said second inclined surface of said basal portion being dimensioned to slide on said resilient leg of said second flange upon rotation of said basal portion in said channel of said base, said rotation of basal portion forcing said basal portion into said channel of said base. a first extension element connected to said first panel by a first connector and a second extension element being connected to said second panel by a second connector, said first and second extension elements (54,62) possessing first and second platforms (64,88), respectively, and being supported by said plate of said base, said first and second platforms (64,88) being positioned apart from each other and adjacent the faces of the first and second panels (26, 28); said basal portion further comprising a first inclined surface and a second inclined surface, each of said first and second inclined surfaces (38,39) being angled relative to a plane passed through said plate, said first and second arms (40,42) including first and second contact surfaces (44,46), respectively, for being positioned directly on said first and second platforms (64,88) of said first and second extension elements (54, 62), respectively, said first inclined surface of said basal portion being dimensioned to slide on said resilient leg of said first flange and said second inclined surface of said basal portion being dimensioned to slide on said resilient leg of said second flange upon rotation of said basal portion in said channel of said base, said rotation of basal portion forcing said basal portion into said channel of said base.