Crack repair is less expensive than replacement in the short term. Whether it delivers better long-term value depends on one question: will the repaired concrete last long enough to justify the cost?
The expected service life calculation
Replacement concrete on a properly prepared base typically lasts 25-30 years in Bay Area conditions. A crack repair that costs 20-30% of replacement cost is worth doing if it extends the remaining service life by at least 5-7 years.
When crack repair has a long expected life
A crack caused by a one-time event (a removed tree root, a ground disturbance now resolved) in an otherwise sound slab, repaired with the correct material and method, can perform well for many years.
When crack repair has a short expected life
A crack caused by ongoing settlement, active drainage issues, or sub-base failure will recur regardless of the repair method used. In these cases, crack repair buys months, not years.
Related: Concrete Repair · Repair vs. Replacement guide · Pricing · FAQ