Hello, Maj. You do not mention the climate you live in. I know nothing about pre-fab 4-seasons rooms, but from the info you provided, I can make a few comments. You said the prices were too high but this one at $5,500 seems to be affordable to you, so I think you answered your own question about the price. That sounds like a decent unit (from the specs). I built a sun room 8 x 14 and it costs a WHOLE LOT more than $5,500 (in Canada, where things cost more). I wish I had made it larger (although that was not feasible). Adding a sun room does not bring more light in. What brings the light in is removing the wall where it connects to the house. I am not sure exactly what else you really want to know. Knowing your zone or State will make it easier for anyone to know what you will be up against. I had to spend a LOT of money on proper footings because of frost and because of a lot of water and a lot of clay, all right where the footings sit. The deck (off of the sun room) and the sun room footings have been repaired and/or removed and/or adjusted 3 times in 8 years. This year, the whole mess will be dug up (with the sun room temporarily supported). The deck is already removed (it heaved nearly a foot this past winter). So be prepared to spend whatever it costs to do the foundation and footings well (based on where you live: climate, soil, water).

We were mulling over the same question a few years ago. We started out thinking screened porch but then realized how much we needed a 4-season gathering space when we entertained. Friends who had gone the 3-season route told us they were essentially 'no season' rooms because they were too hot in the summer and too cold in the winter (you know Minnesota extremes). So we decided to ante up for a 4-season room and we are so glad we did! We went 16'x24', put in 2 sliding glass patio doors to the deck, plus 8 good-sized windows, and a double French door to the dining room. It is a room of light all year round! We followed our furnace guy's recommendation to put in a gas fireplace for heat and a ductless minisplit for air conditioning. They both work splendidly and we can just turn them off and shut the door to the rest of the house when we're not using the room. We love the room in all seasons. With the help and advice of some very skilled siblings, we did almost all the work ourselves and it cost around $40,000.

Yes; with a floor like that it should be a 3 season room. Get some screens in there for the warmer months.

I’d like to paint the top trim of sunroom black because the current light-colored trim looks dirty all of the time. Or, paint the trim and the railing on upper deck black?