Construction.93 2020-09-20by Antony Templier126 Views Written by Antony Templier Extension, 3 walls, no water network, little electricity. Project Data Place:Saint-Denis-de-l'Hôtel Completion:2003-09-30 Construction:Tunnel (GREB technique) with counterfacing mortar Visitable:No Press photos:No Living Area:85m2 U-Value (Wall):W/m2K U-Value (Roof):W/m2K Categories: Projects France, Extension, 3 walls, no water network, little electricity.