It shares the sculpted rafters, pedestal panels and full notched build, and adds a double corner configuration with post section braces. That puts more timber into the joints where the beams meet the posts, which is exactly where a tall frame takes wind load. Choose it for an exposed garden, a larger footprint, or any build where a polycarbonate roof is going on top.

Five square sizes: 2.4m by 2.4m, 3m by 3m, 3.6m by 3.6m, 4.2m by 4.2m and 4.8m by 4.8m, each in Light Green or Rustic Brown. Prices start from £771.99 and rise with the footprint and the options you add, such as a roof kit or privacy panels. Bespoke sizes are made to order when none of the five standard footprints suits the space.

The wall plate fixes to a sound house wall in brick, block or rendered blockwork, and the outer posts stand on the decking base. All fixings for the structure itself are supplied, but the wall fixings are not, because the correct anchor depends entirely on what you are fixing into. If you are unsure what your wall is built from, check before ordering the fixings.

It is built into the product. The decking platform arrives with the frame, cut to the same footprint, so you are not laying a slab or building a deck before the pergola can go up. The ground underneath still needs to be firm and reasonably level, but there is no need for an existing patio for the posts to stand on.

Either works, and both are worth doing once a roof kit is fitted, because a roofed structure catches wind. Concreting the posts in gives the most permanent fixing and suits softer ground. Our bolt-down feet suit sites where you would rather not dig, or where the pergola stands on something solid. Without a roof, the weight of the frame and base does most of the work.