This work covers pulling out old or failing windows and doors and setting new ones in true and square, sealed against water and air. That means impact rated windows, standard window replacements, and exterior doors, including the flashing, shimming, and caulking that make the difference between a window that lasts and one that leaks. A good install is mostly about the opening and the water sealing, not just the unit you pick out of a catalog.
Down here the weather does the testing for you. Wind driven rain in a summer storm will find any gap around a window before you ever notice it inside, and our humidity keeps wood trim and door frames damp long enough to rot and to feed termites, so old wood windows and sills are often soft before anybody looks closely. Hurricane season is the honest reason people ask about impact glass in Lafayette, Broussard, and Youngsville, and impact units also need to be installed to their rating with the right fasteners and flashing or the rating means nothing. Clay soil that swells and shrinks with the wet and dry seasons shifts a house enough that doors start sticking and window frames go out of square, which is why a door that closed fine last year may drag today.
A handy homeowner can reasonably swap a simple exterior door slab in an existing frame, replace weatherstripping, or install an insert window in a sound opening if they are careful and patient. Where you should stop is anything involving impact rated units, cutting or changing an opening, or an opening with rot or termite damage, because those need framing work, correct flashing, and fasteners installed to spec, and a mistake there leaks or fails in the next storm. Impact products in particular have to be installed to their rating to actually protect you and to count for insurance or code, so that is not a place to guess.
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You do not have to have them, but they are the reason many people here replace windows at all. They hold up to wind driven debris in a storm without needing you to put up plywood, and they can help with insurance in some cases. If budget is tight you can also do standard windows now and add storm protection separately, so it is worth weighing both.
Sometimes. If only the seal failed and the frame is sound, a glass or sash replacement may be enough. But if the frame is rotted, out of square, or leaking around the edges, replacing the glass alone leaves the real problem in place.
Not necessarily. Our clay soil moves with the seasons and can shift a house enough to throw a door out of square, and humidity swells wood doors. Sometimes it is an adjustment or a new door slab in a good frame, but if the frame itself is rotted or the wall has moved, that is a bigger fix worth having someone look at.
You often cannot fully know until the old unit comes out, which is why it is worth asking up front how a company handles it. Soft or spongy wood at the sill, bubbling paint, and a musty smell are early signs you can check yourself. Expect that a window or door that has been leaking for a while may have damage hiding behind the trim.
Gerry is an A.I. assistant. He can point you at a trade and take your details, and a person handles the work.