It comes down to what's actually wrong with the wall. A few cracked or spalled units, minor mortar loss, or a drainage problem caught before it causes real movement can often be repaired in place, but a wall that's visibly bulging, leaning, or shifted out of plumb has already failed structurally and needs to come down and get rebuilt correctly.
The key distinction is between cosmetic or localized damage and structural movement. A cracked cap stone, some mortar loss between joints, or an isolated spalled block usually doesn't mean the wall's ability to hold back the soil is compromised, and that kind of damage can typically be repaired without touching the whole structure. A wall that's bulged, leaning, or has sections shifted out of line is a different situation, that movement means the wall has already lost the fight against the load behind it.
Patching a structurally failed wall without addressing the cause rarely works for long. If the real problem is failed drainage, a footing that was never adequate, or missing reinforcement, that cause is still sitting behind the wall after a cosmetic patch, and the same failure tends to come back, often worse, because the underlying pressure never went away.
When we look at a wall that's showing damage, we're checking whether the movement is active or old and stable, and whether drainage and the footing are doing their job, before recommending anything. A wall only gets a rebuild recommendation when a repair genuinely won't hold, not as a default.
More on this from Chelo's Brick & Stone.
Chelo's Brick & Stone serves Hillsville, Galax, Wytheville, Fancy Gap, and Independence, VA. Call for a straight answer and a free on-site estimate.