We put in our semi kit purchased from Lord & Burnham for a ridiculous amount ( comparatively ) of money.
Aluminum extrusion frame, Glass glazing. 9'x29' Attached to house. NOT the way to do it on the cheep. The results are wonderful and well worth the cost, but the cost is not trivial. I think that the kit (frame only) was around 2K, then there was glass, and foundation, building permits, etc.
However it went through the Northridge earthquake (4mi from epicenter) with minor damage (couple of cracked pains). It was worth it.
I say semi Kit because a contractor laid the slab.
The only problem is I need a bigger one and that means moving.