Kevin McCloud reveals what he’s learned about good design in 25 years of hosting Grand Designs

In the first century BC, a Roman architect and engineer named Vitruvius came up with three simple principles of architecture: firmitas, utility and venustas.

In the 17th century, English diplomat Sir Henry Wotton translated these precepts as “firmness, commodity and delight”.

Today, we take them to describe the qualities of durability, utility and beauty in design.