The repair-vs.-replace question comes up for every concrete project where there is existing concrete to evaluate. This guide gives you a structured way to think through it.
Start with the root cause, not the symptom
The right decision depends on why the concrete is failing, not just what it looks like. Cracking caused by a removed tree root is different from cracking caused by an ongoing drainage problem. The symptom looks the same; the correct response is completely different.
Assess how much is affected
One cracked panel in a 10-panel walkway suggests isolated repair. Seven cracked or heaved panels suggests replacement. As the percentage of affected area increases, repair becomes less cost-effective.
The cumulative cost comparison
If you have spent money on repairs in the same area, compare those cumulative costs to replacement cost. New concrete typically has a 25-30 year service life on a proper base.
Scenarios where repair is right
Isolated panel damage with stable surrounding concrete, single section heaved by a now-removed tree root, spalling in a limited area with no base issues.
Scenarios where replacement is right
Widespread cracking, multiple heaved or settled sections, active drainage problem causing ongoing damage, same-location repair history, sub-base failure across a significant area.
Related: Problems with Concrete Repair guide · Concrete Replacement · Pricing · FAQ