Sunroom or solarium kits will cost $2,000 to $5,000 with a lot options around the $3,000 price point. Custom built sunrooms will cost between $10,000 to $70,000 depending on the size and construction materials chosen.
Another big factor in the cost will be labor and whether or not you have a existing concrete slab. As of 2021, it costs between $8-10 per square foot to lay a concrete slab. (source) This means a 10’x10′ concrete slab will be between $800 and $1000 as an example. This would be in addition to any of the other sunroom costs above.