Because they form one system at the edge of the roof, and once water has ruined one it has usually reached the others. Replacing the gutter while leaving rotten fascia behind it is fixing the visible half of the problem. When the fascia and soffit have gone, doing all three at once is the repair that actually lasts.
Gutter Answers connects you with licensed local companies. We are not a contractor and do not perform the work ourselves.

The three come apart and go back in a set order.
For how the eave fits into the whole installation, see how gutters are installed.
The combined job is priced as carpentry plus gutter, so it sits above a plain gutter swap.
| Element | Typical basis |
|---|---|
| Fascia board | $6 to $20 per linear foot |
| Soffit | $6 to $20 per linear foot |
| New gutter | $6 to $13 per foot in aluminum |
Access and the extent of the rot move the total more than the materials do.
Only if the fascia and soffit are genuinely sound. If they are soft, new gutter hung on failing board will sag and leak again, so the saving is false.
For what the gutter portion alone costs, see how gutter pricing works.
If they are rotten, yes. New gutter hung on soft fascia sags and leaks again, so sound board behind the run is what makes the job last.
Fascia and soffit run roughly 6 to 20 dollars a linear foot each, plus the gutter, with access and the extent of rot driving the total.
The gutter comes down, the fascia is replaced, the soffit is renewed with its venting, and new gutter is hung on the sound board.
Rarely well, since the gutter is fixed to it. Sound replacement means taking the gutter down, renewing the board and rehanging.
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