Architype was appointed by Natural Resources Wales to design an exemplar extension to the Coed-y-Brenin Visitor Centre. Set in Snowdonia National Park, the additional 400m2 provides a new bike shop and hire facility, a multi- functional meeting room/cafe overflow area and 24-hour access WC’s. The new building links to the original rotunda building by an overhead bridge where additional retail space forms new entrance feature for the Centre. This special project satisfies the clients’ ambition to showcase Welsh timber and is the first UK building to be constructed from homegrown Brettstapel. Originating in Germany, the Brettstapel process involves using short softwood lengths held together with hardwood dowels that swell and tighten with exchanging moisture content. The result is a solid timber panel, providing dual purpose as a load bearing wall or floor, and internal finish. The process reduces the need for intensive manufacturing methods, and eliminates the use of toxic glues or bonds. Brettstapel suitably uses fast growing low-grade softwoods that are generally disregarded for structural use, opening up an alternative market for timber construction. After rigorous testing and research with Napier University, Architype selected Douglas Fir and Sitka Spruce, readily available species from the surrounding Welsh woodland. The finished building achieves exceptional energy efficient standards. Robust detailing, a thick ‘duvet layer’ of insulation and precision in construction provides excellent airtightness (0.93a.c.h@50pa), natural light and ventilation.