What flange replacement involves
The closet flange is the ring fitting that connects your toilet base to the waste pipe. It holds the wax-ring seal and the closet bolts. When it cracks, breaks at a bolt slot, or rusts (cast iron), the toilet has nothing to seal against — and you get leaks, rocking, and sewer gas escape. Replacement requires pulling the toilet, removing the old flange, installing a new one, and resetting the toilet on a new wax ring.
Typical cost breakdown
| Flange type | Parts | Labor | Total |
|---|---|---|---|
| PVC repair (existing pipe intact) | $15-25 | $120-180 | $135-205 |
| PVC replacement (cut and reglue) | $20-35 | $180-280 | $200-315 |
| Cast iron repair ring (drop-in) | $25-45 | $150-220 | $175-265 |
| Cast iron full replacement | $60-100 | $300-500 | $360-600 |
| Concrete-embedded flange (slab) | $30-60 | $280-500 | $310-560 |
Add $20-30 for a new wax ring, supply line, and closet bolts (included in any flange replacement). Emergency or after-hours service typically adds $100-200.
When to call a pro vs DIY
Call a pro if: the flange is cast iron and needs full replacement, the existing pipe shows damage above the flange, the subfloor under the toilet is soft or rotted, you can\'t reach the shut-off valve, or you don\'t have plumbing tools and confidence.
DIY is reasonable if: the flange is PVC, you have basic plumbing experience, the subfloor is sound, and you have 2-3 hours uninterrupted.
How long it takes
A simple PVC flange repair takes a pro about 60-90 minutes including toilet pull-and-reset. Cast iron replacement is 2-3 hours. Slab-embedded or rotted subfloor adds 1-3 hours depending on extent.
What\'s included in a typical quote
- New flange (PVC, cast iron repair ring, or full replacement)
- New wax ring with horn
- New closet bolts and caps
- New supply line (often included)
- Toilet pull, reset, and leak test
- Disposal of old materials
Not included: subfloor repair (typically $200-600 if rot is found), new toilet (if pulling the old one cracks the base — rare but possible), or any drain-line work below the flange.