A sunroom is mostly a set of junctions between things that move at different rates. Every one of those junctions is decided by a person with a pair of tin snips.
You Cannot AI-Zap A Flashing Detail

“We know that AI can’t fix your roof, it can’t fix your door, the electrician can’t you can’t AI zap something for it to fix your electricity or your plumbing.”
— Benjamin Behrooz, Branding Los Angeles
The sunroom version of that sentence is the head flashing. Where the new roof meets the existing wall, somebody has to decide how far up the wall the upstand goes, how it laps the existing cladding, how it terminates at each end, and what happens where it meets a corner.
Get it right and the room is dry for thirty years. Get it wrong and no amount of sealant fixes it, because sealant is a consumable and flashing is a system.
Where Craft Actually Shows Up In A Sunroom
Four places, in our experience. The head flashing above. The sill pan and threshold, where water that gets past the door has to be given somewhere to go. The transition where the new floor meets the old, which is where an addition either disappears or announces itself. And the point where the new structure bears on ground that has been settling for decades.
None of these appear in a brochure. All of them are decided on site by whoever is standing there.
Why Local Beats A Franchise Kit

A kit assumes a flat, square, plumb wall of a standard construction. Very few Upper Cumberland houses provide one.
A site-built room starts by measuring what is actually there and adapting to it. That is slower and it is why the quotes differ. It is also why one of them needs a packer behind every fixing and the other does not.
Behrooz’s warning about an “inundated market” is relevant here too: a lot of what is being sold locally is a national product with a local phone number.
Questions That Reveal Real Experience
Ask how they will flash the roof-to-wall junction, and listen for whether the answer involves a detail or a product name. Ask what they do when the existing wall is out of plumb. Ask to see the threshold detail on a room they built five years ago. Ask who will actually be on site.
A builder who enjoys those questions is the one you want. A builder who redirects to finance options is answering a different question.
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