When tank-only replacement is possible
For two-piece toilets where the tank is cracked but the bowl is intact, manufacturers offer same-model tank-only replacements. The new tank bolts onto the existing bowl using the same gasket pattern. This is only possible if:
- Your toilet is from a major brand (Kohler, TOTO, American Standard, Mansfield) that still sells tank-only SKUs
- The exact model is still in production OR was discontinued less than ~10 years ago (parts still available)
- The bowl is undamaged (no cracks, hairline cracks, or chips at the tank-bolt area)
- The exact model number is identifiable from the stamp inside the bowl rim or under the tank lid
For one-piece toilets (where tank and bowl are fused), tank-only replacement is impossible — the entire toilet must be replaced.
Cost breakdown
| Scenario | Tank cost | Labor | Total |
|---|---|---|---|
| Standard tank (Kohler, AmStd, TOTO) | $80-180 | $100-200 | $180-380 |
| Premium model tank | $200-400 | $150-250 | $350-650 |
| Discontinued model tank (special order) | $200-500+ | $150-250 | $350-750 |
| Full toilet replacement (often cheaper) | $175-700 | $200-400 | $375-1,100 |
For toilets 15+ years old, full replacement is usually more cost-effective than tank-only — the bowl is also approaching its lifespan, and tank-only is more expensive per dollar of remaining useful life.
What the service includes
Locating the correct OEM tank, shutting off water, draining and removing the old tank, inspecting the bowl-side mounting surface and the tank-to-bowl bolts, installing the new tank with new spud gasket and new bolts, reconnecting supply line, leak-testing 3 flushes, and disposing of the old tank.
When to choose full replacement instead
Three factors push toward replacing the whole toilet:
1. Age (toilet 15+ years old). Bowl glazing is degraded; flush is undersized vs modern WaterSense. New toilet is more efficient long-term.
2. Model has been discontinued. Future part availability is uncertain. Replacing now with a current model means parts will be available for the next 20 years.
3. Total cost is close. If tank-only is $350 and a new comparable toilet is $400 installed, the new toilet is the better value.
Insurance considerations
If your tank cracked and caused water damage to the floor, drywall, or ceiling below, your homeowners insurance may cover both the water damage AND the toilet replacement under "sudden and accidental discharge." Document the failure with photos before any repair, and call your insurance before paying for the replacement.