Red, microcline rich granites occur in the Åmål and western Pregothian tectonic mega-units in south-western Sweden. The Sandsjön granite is the northernmost known occurrence of these rocks in the ‘Western Pregothian’ of Sweden. The Rb-Sr whole-rock dating of the Sandsjön granite fails to give any conclusive age, hypothetically due to either a metamorphic disturbance or to an inhomogeneous distribution of the initial87Sr/86Sr ratio. The zircon age is 1210+16−14Ma (1σ) and is interpreted to correspond to the crystallization of the Sandsjön granite. The emplacement of this granite is thus contemporaneous with previously dated similar granites in the Åmål and ‘Western Pregothian’ mega-units.