It is possible to build a conservatory entirely without walls, but tradition dictates the uses of a dwarf wall beneath the conservatory windows. This has the added benefit of adding some structural strength to the conservatory and the new structure will blend in beautifully with the existing house providing that the brickwork matches. The height of the conservatory dwarf wall can be varied. Conservatories are often designed from top to bottom. The position of the sills and upstairs windows can't be changed, it is often this height and the pitch of the conservatories roof that determine the size. Dwarf walls must be designed to a height measured in brick courses; each course (a brick plus a layer of mortar) is about 75mm. The dwarf wall must also have 2 "skins" together with a DPC layer. Typically the outer skin is made of brick with the internal skin made of 100mm block. It’s important to include a DPC positioned beneath the door sill and at least two courses above the ground level.

Brickwork
The quality of brickwork is very important (unless the outer side is to be rendered). Poor quality or non matching brickwork will always stand out. Mortar joints can also cause problems over time as the bricks will often suffer from efflorescence. The mortar joints between the bricks should be if equal thickness in every course and of equal width in the vertical joints.