NP but it sounds like construction hasn't started yet which means the price is not real. |
Right. The final total is always a lot higher. Usually by 100% or so. |
$280/sq ft for a small addition (remember, economy in scale) with a bathroom is unrealistic. Particularly since it must not be a fixed price contract if PP is talking about 'expected' totals. |
| 100-150 at a minimum. |
Maybe piers on footers. Though I've seen it described as posts, as in post and beam. I have a 1950 Cape Cod built on pier and beam foundation with open crawl space. I think code allowed 1.5 stories built on these foundations, though I could be remembering that incorrectly. |
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For all of those - 3 season, 4 season, screened in - you'll need a foundation, roof, and some electrical work. There are 5 categories of sunrooms, according to (I think) the IRC, with categories 4 and 5 being closer to regular rooms. Costs will vary with the type of windows and doors you buy, roof type, extent of electrical work, access to site, siding type, and interior finishes. So, you'll probably pay a minimum amount for the work to be done, no matter screened in or sunroom.
I had a sunroom rebuilt from an existing closed in porch (had slider windows and siding and a storm door). Roof was already in place. I had to rebuild the footers and piers to code. I replaced rotted beams and joists, and added more to strengthen the floor and walls. I went with inexpensive vinyl windows and fiberglass doors, wood siding. I'll add a mini split. All in, not including sweat equity, I'm looking at about $25k. If I had the extra money, I probably would've paid someone to do all of the work. I don't have an expensive house with expensive trim, so my costs were on the lower end anyway. I'd get detailed quotes and compare material costs. Those should be comparable across all quotes. The difference will be the labor, project management, and schedule. If you know what you want for windows, doors, siding, and roof materials, you could price those out yourself to get some idea of costs. |
Code no longer allows any wood below ground. You can do piers, but you the pier has to be concrete to the surface. You then can have a treated wood post sitting on top of the concrete pier. Since the post isn't continuous, you have to have bracing to keep it from hinging at the point it attaches to the concrete if there is any horizontal force. It's all doable, but it becomes more expensive, to the point where you might find it easier just to dig trench and lay concrete block. |
Thanks for describing the difference. |
Four season sunroom has HVAC and is designed to be usable year-round. Yours sounds like a "three season room" (which, yes, is often not actually comfortable for three full seasons.) |