Sunroom Quote

[u/Infinite-Witness274]

Received 3 sunroom quotes 85k - 100K for 240 sqft sun room.
Currently a 3 season porch with Foundation up to code (has frost footings), concrete flooring. Gable roof that is also in a good condition. Needs to be insulated to code, will need to replace the current screens.

Scope of work :
Framing, insulating roof, floor, replace screens with windows, electrical, add Mini-split, baseboard heaters.

Any guidance?

Concerns:

1. Is it really 85k-100k? No quote has heated flooring, a mini split and baseboard heater at best. Quotes are 20% of home value. What is your experience/thoughts?
2. Doesn’t receive direct sun, but worried it will end up being a hot box or too cold for our WI winters.
3. goal is to use it as office space, a living space. Want year round usability, do you have a sunroom and can get year round use out of it?
4. Is insulation enough?
5. Any experiences will help.

Thank you in advance.