It levels the footprint, separates the structure from whatever surface is underneath, and gives the space beneath the pergola a finished floor from day one. On a sloped garden it removes the need to level ground before erecting the posts. On an existing patio it creates a defined platform that reads as a distinct outdoor room.

The posts need fixing — either bolt-down feet on hard surfaces or concreted in on soft ground. If a polycarbonate roof is being added, fixing is essential regardless of surface type. The decking base is supported on the post frame.

Yes, both are chosen at the point of order. Roof kits in clear, opal or bronze polycarbonate with white or brown glazing bars. Privacy screening in heavy-duty rebated redwood as one side, two sides, one back panel or combinations. When a roof is selected, a five degree pitch is built into the rafter positions.

The pressure treatment protects against rot and fungal attack for up to fifteen years. The surface stain — Rustic Brown or Light Green — benefits from refreshing every two to three years but fading does not affect the structural protection.

Two people with a drill, a level and spanners can build most sizes in a day. Posts are set first, then the decking frame and boards, then the top rails and rafters.