Cast iron stack replacement cost averages about $6,500 nationally, within a $3,000–$9,000 range, and runs $6,000 to $15,000+ in high-cost urban markets like New York, according to HomeAdvisor. In NYC the price also depends on height: PVC is allowed only in residential buildings of five stories or fewer, and pipe lining is banned.
NYC Repipe & Repair publishes these figures with named sources so every number can be checked before you call anyone, including us.
The cast iron stack is the vertical drain that carries every toilet, tub and sink in the building down to the house sewer, with its vent continuing up through the roof. In a prewar NYC house or walk-up, it’s often original. Cast iron lasts a long time, but it rusts from the inside, cracks at the hubs and fails first at the base, where the stack turns horizontal under the cellar floor.
Cast iron stack replacement prices
There’s no published NYC-specific price for a full stack, so the table pairs national data with the closest NYC figure.
| Scope | Typical price | Source |
|---|---|---|
| Stack replacement, national range | $3,000–$9,000 (average about $6,500) | HomeAdvisor |
| Stack replacement, high-cost urban markets | $6,000–$15,000+ | HomeAdvisor |
| Small leak or crack repair | $300–$1,200 | HomeAdvisor |
| Single drain branch in NYC, including cast iron to PVC | $2,500–$6,000 | Handyman NYC price guide |
Material is a small part of the bill. HomeAdvisor prices 250 feet of cast iron pipe at $2,500–$5,000 against $125–$250 for PVC, and the rest is labor, access and restoration. For a combined figure with a supply repipe, use the repipe cost estimator.
NYC code rules that set the price
Two sections of chapter 7 of the 2022 NYC Plumbing Code decide what you can buy:
- PC 701.9, plastic only up to five stories. Plastic drain, waste and vent pipe may be used only in residential buildings of five stories or fewer. A Brooklyn brownstone or a Queens two-family can go to PVC. A six-story Bronx walk-up or a Manhattan co-op can’t, so the stack goes back in cast iron, which is heavier, slower to handle and costs more per foot.
- PC 701.10, no pipe lining. Cured-in-place pipe and epoxy spray lining “shall not be used”. The lining quotes national companies market as a cheap alternative aren’t an option here. See pipe lining vs repiping.
Noise is the other factor. Cast iron is quieter than PVC inside a bedroom wall, so some owners in buildings where PVC is allowed still choose cast iron for the stack and PVC only for short branches.
What moves a stack price
- Height and fixture count. Every floor adds stack, a branch connection and a wall opening. A four-story brownstone has twice the stack of a two-story house.
- Where the stack runs. A stack in a closet chase or an unfinished cellar is cheaper to reach than one behind tile or plaster. National guides put drywall repair alone at $50–$75 per square foot (Bob Vila).
- The base and house sewer. If the failure is under the cellar slab, breaking and patching concrete is added. That’s the townhouse owner’s question about “digging up the floor in the finished basement” in this NYC thread. A slab job overlaps with slab leak repair.
- Supply work at the same time. Opening the wall once for the stack and the whole house repiping of the supply lines is cheaper than two separate jobs.
- Attached neighbors. In a rowhouse, the roof vent and the shared party wall can complicate access.
Permit and DOB fees
Replacing a stack goes beyond the 10-foot ordinary plumbing work limit, so a Licensed Master Plumber files it in DOB NOW. A 1–3 family house pays $130 up to $5,000 of work, then $2.60 per $1,000; other buildings pay $195 up to $3,000, then $10.30 per $1,000 (DOB fee charts). DOB witnesses the test on altered systems. The repiping permit guide covers the process, and how long repiping takes covers the schedule.
Signs it’s time
Sewer odor in a wall, recurring clogs at the same branch, rust weeping at hubs, and a stain spreading down a wall or across a ceiling below a bathroom all point at the stack. A leak that has already soaked a ceiling may be partly an insurance question; see is repiping covered by insurance. Brownstone owners in Brooklyn and Bedford-Stuyvesant see this most, along with rowhouses in Ridgewood.
Bottom line
Budget toward HomeAdvisor’s high-cost urban range of $6,000–$15,000+ for a full cast iron stack replacement in NYC, less for a single section or a partial pipe replacement, and more where the code requires cast iron over PVC. The cast iron stack replacement page shows how the work is done floor by floor. Call (929) 659-6658 for a free on-site estimate with a written, itemized price.