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Cast Iron Drain Pipe Failing? Orlando Repipe Guide

Updated 2026-11-02 · Sources verified 2026-07-20

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Replacing corroded drain pipe is permit work, and the code says so in the same sentence as the exemption. Permit in Orange County: permit required. Replacing or rearranging any water supply, drain, waste, vent, or sewer piping requires a plumbing permit (FBC 105.1). The full rule and its official source are below, with the code requirements and mistakes that trip up Orlando homeowners.

Key facts before you start

Replacing corroded drain pipe is permit work, and the code says so in the same sentence as the exemption. FBC 105.2 exempts "the clearing of stoppages or the repairing of leaks in pipes, valves or fixtures and the removal and reinstallation of water closets, provided such repairs do not involve or require the replacement or rearrangement of valves, pipes or fixtures" — then adds that when a concealed drain, soil, waste or vent pipe becomes defective and has to be removed and replaced, that IS permit work. Snaking a clog is exempt; replacing the pipe the clog keeps happening in is not.
The tip that saves five figures: in Florida you may NOT line a pipe that has already failed. FBC-Plumbing 717.5 says where the pre-installation video "reveals that piping systems are not installed correctly or defects exist, relining shall not be permitted," and "the defective portions of piping shall be exposed and repaired." The defects it names are the classic cast-iron failures word for word — backgrade or insufficient slope, and complete pipe wall deterioration. If a bid offers to line a pipe the camera shows has already failed, it is offering something the code prohibits.
The camera survey is code, not an upsell. For relining, FBC-Plumbing 717.3 requires the pipe be descaled, cleaned and flushed and then "inspected internally by a recorded video camera survey," and 717.3.1 requires that video to verify the project address and note cleanout and fitting locations, approximate depth, and the length of piping at intervals no greater than 25 feet. Under 717.4 the code official reviews that video BEFORE the permit is issued — so ask for the recording, because the county is going to.
Do not let sewer-and-drain grade PVC go under your slab. FBC-Plumbing Table 702.2 governs underground drainage inside the building footprint and allows PVC only in IPS diameters — Schedule 40, DR 22 (PS 200) or DR 24 (PS 140) to ASTM D2665/F891. The cheaper thin-wall SDR 35 / ASTM D3034 sewer-and-drain pipe appears only in Table 702.3, which is the building sewer OUTSIDE the building. Cast iron remains legal in both (ASTM A74, A888, CISPI 301), so a like-for-like cast-iron replacement is lawful — it is the pipe spec on the quote you check, not the brand.
Under-slab drain replacement is not a DIY project, and the statute draws the line precisely. FS 489.105(3)(m) puts "sanitary drainage or storm drainage facilities" and "storm and sanitary sewer lines" inside the plumbing contractor's scope, and carves out exactly one thing — a plumbing contractor "may perform drain cleaning and clearing," and "a mandatory licensing requirement is not established for the performance of these specific services." You may pull an owner-builder permit on your own home (FS 489.103(7): owner "acting as their own contractor," for "the occupancy or use of such owners and not offered for sale or lease," and the owner "may not delegate the owner's responsibility to directly supervise all work to any other person" unless that person is registered or certified), so an unlicensed crew cannot do it for you. Orange County lists re-pipe among its plumbing inspections.
Age is what carriers now ask about, so get the paperwork before the concrete goes back down. InterNACHI's Estimated Life Expectancy Chart for Florida Homes puts cast-iron waste pipe at 50-60 years below ground and 40 above, against 50-80 for ABS and PVC — so original cast iron in a 1950s-70s Orlando house is at or past the end of that window. Citizens' 4-Point form (updated 3/20/25) now asks the age of the drain piping system — "Original to home," "Completely re-piped" or "Partially re-piped" — so a documented, permitted replacement is worth keeping with the closing papers.
Know which failure you have before you price the fix, because they are not the same job. A camera survey distinguishes scale build-up (still round, just narrowed), channelling (the pipe bottom eaten away so the invert is gone), bellying (a low spot holding water, which is a slope problem not a pipe problem), and complete wall deterioration. Only the first is a cleaning job; bellying is a re-slope and the last two are replacement — and per 717.5 the last two also disqualify lining.

The permit answer

Permit required. Replacing or rearranging any water supply, drain, waste, vent, or sewer piping requires a plumbing permit (FBC 105.1). Leak repair, drain clearing, and toilet remove-and-reinstall (wax ring) are exempt.
Source: https://www.orangecountyfl.net/PermitsLicenses/Permits/PlumbingPermit.aspx

Orange County and the City of Orlando run separate permit offices with separate portals — and your mailing address alone doesn't tell you which one covers your home. Check which permit office covers your address →

Cast Iron Drain Pipe & Repipe: what it looks like

cast iron drain stack inside opened bathroom wall

fresh concrete patch around PVC drain in slab

What it costs

DIY: n/a — not a DIY job; cast iron pipe material alone runs $5–$12 per linear foot (labor not included)
Hiring it out: $150–$250 per linear foot for drain pipe replacement ($100–$800 for minor drain pipe repairs); repiping an entire home runs $2,000–$15,000
Repiping an entire home runs $2,000–$15,000 (HomeGuide's whole-house plumbing survey)
Published national figures (HomeGuide, checked Aug 2026): https://homeguide.com/costs/cost-to-replace-or-repair-a-drain-pipe. Prices move — the free planner pulls current retail prices for your exact repair.

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Frequently asked questions

Do I need a permit for a cast iron drain pipe & repipe repair in Orange County, FL?

Permit required. Replacing or rearranging any water supply, drain, waste, vent, or sewer piping requires a plumbing permit (FBC 105.1). Leak repair, drain clearing, and toilet remove-and-reinstall (wax ring) are exempt.

Are there specific building-code requirements for a cast iron drain pipe & repipe repair?

Replacing corroded drain pipe is permit work, and the code says so in the same sentence as the exemption.

What does a cast iron drain pipe & repipe repair cost?

DIY: n/a — not a DIY job; cast iron pipe material alone runs $5–$12 per linear foot (labor not included) Hiring it out: $150–$250 per linear foot for drain pipe replacement ($100–$800 for minor drain pipe repairs); repiping an entire home runs $2,000–$15,000 Repiping an entire home runs $2,000–$15,000 (HomeGuide's whole-house plumbing survey) Published national figures (HomeGuide, checked Aug 2026) — local prices vary, and the free DIYrr planner pulls current retail prices for your exact repair.

Looking for a different repair?

Sources

https://codes.iccsafe.org/s/FLBC2023P1/chapter-1-scope-and-administration/FLBC2023P1-Ch01-SubCh02-Sec105.2
https://up.codes/viewer/florida/fl-plumbing-code-2023/chapter/7/sanitary-drainage
https://www.flsenate.gov/Laws/Statutes/2025/489.105
https://www.flsenate.gov/Laws/Statutes/2024/489.103
https://www.nachi.org/florida-life-expectancy.htm
https://www.citizensfla.com/-/20250320-roof-and-4-point-inspection-form-updates
https://up.codes/viewer/florida/fl-building-code-2023/chapter/1/scope-and-administration
https://www.orangecountyfl.net/PermitsLicenses/DoINeedaPermit.aspx
https://www.orangecountyfl.net/PermitsLicenses/DivisionOfBuildingSafety.aspx

This guide is general informational content, not professional or legal advice. Codes and county rules change — confirm permit requirements with your local building department, and use a licensed professional for electrical, gas, structural, or main-line plumbing work.