Intervention on any architectural property requires exhaustive prior documentation. Often this documentation comes from different sources, sometimes offering unconnected or contradictory data. In these cases, it becomes necessary a review, structuring and expansion of such documentation. The generation of 3D models, is a useful methodology for the geometric analysis of heritage elements, as well as for the validation of the existing documentation. This paper applies this methodology to the analysis of the Church of San Esteban (fourteenth century), located in the historic center of the city of Seville (Spain). The urban layout of the surrounding area makes the traditional survey of the church very difficult, so there are significant discrepancies between the existing planimetries. The study focuses on the specific case of the main façade of the temple; where a recent survey using photogrammetry has allowed the real vision of its dimensions and construction details, establishing a starting point for future actions. The results show differences between the current geometry and the one described in the historical plans of the building.