This dataset accompanies the paper “geof3D: SPARQL Geometrical Functions for Co-Designing Buildings” and contains all resources required to reproduce the experiments, evaluations, and use cases presented in the work. It includes the full set of SPARQL extension functions used for 3D geometric operations, a collection of 3D geometries in Well-Known Text format used as input data, the SPARQL queries applied in the Low-Carbon Residential Lighthouse co-design use case, and the evaluation results generated from performance and correctness testing. Together, these components provide complete support for reproducing the workflows, validation steps, and analytical results described in the publication, enabling further research in semantic spatial computation and multi-disciplinary co-design.