A traditional period Orangery is very different in design and construction to that of a classical Conservatory. The main difference is in the entire roof structure, an Orangery has a glazed lantern which has a smaller footprint than the structure itself. Because of this, the pitch of the roof can be much lower, with an angle of 22.5 degrees, rarely more than 25 degrees, and the amount of glass is significantly less too. This creates a softer interior ambiance and a roof profile that is more sympathetic to a wide variety of architectural backcloths.
The Orangery roof structure also differs to that of a Conservatory. The Orangery has a traditional wide hidden box-gutter to the perimeter of the lantern, which drains water through chutes into traditional hoppers and downpipes.
The next key difference is in the side-wall design; an Orangery is much more substantial in appearance compared to a typical Conservatory. A classic Orangery will always incorporate columns that flank each window and door-set. These columns will incorporate period base & capital detailing and the columns will be mirrored on the interior elevations with identically profiled pilasters. A key signature of an Orangery is the bold colonnade effect created by these window and door flanking columns, an Orangery without this element is simply a glazed structure without architectural merit or identity.
A well designed Orangery should always follow the 'Classical Orders of Architecture', which determines the scale and proportion of the individual elements - such as entablature depth, column widths and heights, fenestration, and glazing detail....all in relation to one other. This is very difficult to achieve, and only individually designed and truly bespoke manufactured Orangeries can reflect this detailing with high degrees of architectural empathy and accuracy.