Old is not the same as finished
Aluminium gutter does not really wear out. Left alone, and kept reasonably clear, a 5-inch aluminium run will outlast two or three of the fastening systems that have held it up and several of the roofs above it. What ends a gutter in Charlotte is almost never the age of the metal, which is inconvenient for anybody quoting by the foot.
The three conditions that genuinely end a run
We will quote a replacement without hesitation when one of these is present, and we will argue against it when none of them is.
One: the trough has corroded through. Not stained, not chalky, not oxidised on the outside, but actually perforated at the bottom of the channel. Aluminium takes a very long time to reach this and it usually gets there because a section has held standing water and silt continuously for years, often behind a guard nobody serviced or on a run pitched away from its outlet. The reason it ends the run rather than the section is that the metal either side has been sitting in the same conditions and is at the same stage; patching one hole buys you a season before the next one.
Two: the fascia has nothing left to fasten into. This is the common one, and it is really a carpentry judgement rather than a gutter one. A run that has been re-hung once is fine. A run that has been spiked, re-spiked and then re-hung on hangers has a board with a line of enlarged holes along it, and eventually there is no sound timber left within reach of a new fastener. At that point the fascia and the gutter come off together, because replacing the board means dropping the run anyway and re-using twenty-year-old metal is a false economy at that point in the job.
Three: the system is wrong for the roof, not just tired. A house where every symptom traces back to too few outlets, undersized downspouts or a gutter that was hung below the roof line to begin with is not going to be fixed by repairing it. Charlotte peaks at 7.27 inches of rain an hour over a five-minute burst, and a system that cannot clear that will overflow no matter how good the joints are. Replacing gives us the chance to set drop positions from the roof planes rather than inheriting the original mistakes, and that is a legitimate reason to replace metal that is otherwise sound.
Appearance is a fourth reason and it is a perfectly good one. Gutter and fascia are a continuous line across the whole front of a house and a chalky, dented, three-times-patched run is genuinely visible from the street. We will not dress that up as a technical necessity, and we will price it honestly as what it is.
What is not on this list: sagging, leaking at the mitres, standing water, a run that has come away at one end, spikes standing proud, or a gutter that overflows in heavy rain. Every one of those is a repair, they are all on the repair page with a price against them, and between them they account for most of what gets quoted as a replacement in this market.

Replacing at the same time as the roof
If a re-roof is coming, that is the moment, and the sequence is worth getting right.
Gutters come off before the roofers start, because they will otherwise be full of nails, shingle granules and offcuts, and because a ladder against a gutter for a week does it no favours. They go back on after the new roof edge exists, and that is the important part: the drip edge has to sit into the gutter, not behind it. Get that wrong and water leaving the roof runs down the back of the gutter and into the fascia, which is the fastest way there is to rot the board you have just hung new metal on.
Homeowners here regularly ask for one company that does both. We are not that company (gutters are all we do), and there is an argument that the split is better anyway, because the roofer's gutter subcontractor is generally the cheapest one available and the drip edge detail is exactly where that shows. What we do is book to the roofer's dates and take the gutters off and put them back, which costs less than it sounds because it is one crew making two short visits rather than a full installation.
Partial replacement is usually the honest answer
Houses do not fail evenly. The north elevation under the oak, the run behind the chimney and the section over the conservatory all live harder lives than the front of the house, and it is common to find one or two runs genuinely finished while the rest have another decade in them.
We quote by the run rather than by the house for exactly that reason. It means a replacement can be $700 rather than $3,000, and it means the conversation is about which elevations rather than whether to do it at all.
The one caveat is visible matching. New aluminium next to a run that has weathered for fifteen years will read slightly different for the first year or two, and on a front elevation that sometimes tips the decision to doing the whole face. We say that before the work rather than after you stand in the road and look at it.
What the job covers in Charlotte
What we cover
Full and partial gutter replacement across Charlotte and the surrounding counties, including re-roof sequencing.
Target outcome
New metal only on the runs that need it, with the fascia and drop positions corrected rather than reproduced.
Decision point
We publish the three conditions that genuinely end a run, so you can check them before anyone quotes you.