A client sent this picture as an idea for a roof over their patio. The wanted a clear roofing material. Below is my response via email. It is just the beginning of the relationship, so I will touch base again and update as the project evolves.
I like the form and the overall idea of that structure as it seems to fit the house style. I don’t like it being so high up though because it doesn’t scale properly to the house and it will feel awkward being so high up when you are in the space. Also, rain will easily blow into the space underneath. At first glance, there are several other option worth considering.
The structure will need ceiling joists to support the clear material roof (we have used a product called Polygal and like it. It comes in many colors and shades. Using a totally clear material results in a very hard to clean dirty surface after a season of leaves dropping.
The project will require permits. Adding a solid roof structure to a house requires engineering calculations, review and seal. If you only submit a pergola and put the roof on after the fact, the permits and the engineering is much less extensive and costly.
At first glance I would budget at least 20k-25k for the project. That includes the permit drawing and application process, digging footers for the columns, making the house attachments with ledger boards, flashing and restorations as needed, building the framing, installing the roofing, cleanup and site restoration. Materials choices and construction techniques need to be resolved in order to give a clearer idea of price. The project could get into the 25k-30k range with the use of composite materials, architectural columns and higher end details. Using a rough timber framing material approach, the project could stay in the 20k range.