12/06/2026
The copper roof at Erme House is only just being installed, yet it is already beginning its transformation.
One of the remarkable qualities of copper is that it continues to evolve throughout the life of a building. When first installed, it has a warm, reflective finish that highlights the craftsmanship of the installation and the clean geometry of the roof design. Even at this early stage, however, the surface is already reacting with oxygen and the elements.
Over time, exposure to air, moisture and trace atmospheric compounds causes the copper to oxidise, forming a thin, stable layer known as a patina. This is not a coating and it is certainly not a sign of deterioration. Instead, the patina acts as a natural protective barrier, shielding the copper beneath and increasing its resistance to corrosion.
As the process continues, the copper gradually darkens into rich brown tones before eventually developing the green and blue hues for which copper roofs are renowned. During this transition, the roof can appear beautifully varied, with different areas weathering at different rates depending on sunlight, rainfall and roof geometry.
Given Erme House's exposed coastal setting, salt carried in the sea air is likely to accelerate the process, allowing the roof to develop its distinctive character sooner than it would inland.
The evolving copper roof sits above the emerging stone plinths and expressive glulam timber structure, forming part of a material palette inspired by the rugged South Devon coastline. As the building settles into its landscape, the copper will continue to change, mature and tell the story of its environment for decades to come.
Read more on this coastal house www.vesp.uk/news-item/vesp-architects-achieve-planning-permission-for-striking-replacement-dwelling-on-south-devon-coastline