Repiping isn't one job. It's five — and quoting the wrong one is how flippers blow the plumbing budget. The rest of this guide is how to tell which scope your house actually needs.
The catch: you don't always get to pick. Galvanized lines, polybutylene piping, or a pre-1986 home with one open joint can force a partial job into a full one once the inspector walks through — the cost trap most online estimates skip. Plug your house through the plumbing repipe cost calculator before calling a plumber.
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How pros budget a repipe — the five scope modes
The single most important thing to get right before pulling a quote is which scope category your property falls into. Cost ranges, code implications, and inspection requirements all change. A flipper quoting “repipe” without specifying scope is going to eat the difference when the inspector tells them which scope they actually need.
| Scope mode | What's touched | Typical band (1,500-2,500 sqft) | When to pick |
|---|---|---|---|
| Full-house repipe | Every supply line, manifold-to-fixture; major shutoffs + PRV | $7,000-$15,000 | Galvanized or polybutylene present anywhere; pinhole history on copper; whole-system age > 50 years |
| Partial branch | One zone or bath cluster; existing supply elsewhere left in place | $2,000-$4,500 | Bathroom reno; basement finish — and only when galvanized / polybutylene are NOT in scope |
| Main line replacement | Primary supply: street-to-meter (utility/ROW) OR meter-to-manifold (homeowner) | $2,500-$8,000+ | Pressure issues upstream of the manifold; lead service line; utility-side leak on a stop-and-waste |
| Galvanized → PEX | Material-driven full-house conversion; old steel replaced with PEX A/B home-run | $6,500-$13,000 | Galvanized confirmed; insurance non-renewal pressure; pre-flip required disclosure |
| Repair only / leak section | Localized repair: section replacement, push-fit transition, or single leak | $400-$1,500 | Single point-of-failure on otherwise healthy system; no systemic-material flags |
Cost bands above are SiteworkMath planning ranges, not contractor bids — pricing anchors come from manufacturer install guides (Uponor PEX A, SharkBite PEX B, Apollo PEX, copper Type L/M), MCAA labor benchmarks where citable, and regional Chicago-metro permit fee schedules. SiteworkMath combines those into the per-scope band you see here. Verify against a local plumber quote before signing a contract.
The inspector reality — what forces a partial into a full
Two systemic-material conditions reliably force-promote a smaller scope into a full-house repipe when the plumber walks through. The trap is that the flipper has already quoted partial-scope dollars to the buyer, and eats the difference when reality lands. The calc and the engine handle this with explicit scope-promotion logic; this section is the editorial version.
If this is your own house and you're not flipping, the same warnings still apply — use them to decide whether you can honestly repair one branch this year or whether you need to budget the whole system. Insurance non-renewal letters land the same way on owner-occupants as they do on flippers.
- Galvanized supply lines (pre-1960 stock). Galvanized steel corrodes from the inside out. The failure mode is systemic — fixing one branch doesn't stop the same failure from showing up in the next branch over the next 6-24 months. Most plumbing inspectors in the Chicago metro will not sign off on a partial repipe that leaves galvanized in any of the remaining branches. Insurance carriers are the second pressure point: they routinely flag galvanized post-walkthrough and give 30-90 days to remediate or non-renew the policy. Default rule: galvanized present anywhere = full-house repipe scope.
- Polybutylene (PB) piping (1978-1995 stock). Polybutylene was installed widely in residential supply lines during the 1980s and early 1990s — and was the subject of the $1.1B Cox v. Shell Oil Co. class-action settlement1over chlorine-induced degradation. Modern insurance carriers treat PB the same way they treat galvanized: non-renewal pressure on the homeowner's policy until it comes out. The class-action settlement window closed in 2009; replacement is now the only path. Mixed PB + copper systems are unmaintainable because every PB-to-copper transition fitting is a leak point waiting for the chlorine clock to run out. Default rule: PB present anywhere = full-house repipe.
- Pre-1986 lead-solder remediation2. This is the trap most flippers miss. Pre-1986 copper joints used lead-based solder until the Safe Drinking Water Act 1986 lead ban took effect. Opening any pre-1986 joint during a partial repipe triggers lead-free-solder remediation under the SDWA amendments and the EPA Lead and Copper Rule (LCRR) — if a disturbed joint isn't re-jointed with lead-free solder, the inspector requires remediation of every disturbed joint and sometimes the broader branch. Partial scopes on pre-1986 homes routinely scope-creep into “at-minimum partial branch” even when the original request was repair-only. (Note: IPC 312 covers system pressure testing, not lead chemistry — the lead-free-solder rule is EPA / SDWA territory.)
How a real Chicago-metro repipe actually went
The 2018 rehab on a Chicago-area bank-owned single-family was a 1,420 sqft pre-1955 single-story with a galvanized supply system and a copper drain rough that turned out to be cast iron below grade. The walkthrough budget was a partial bathroom repipe — one hall bath, fixture replacement, and a transition fitting to leave the rest of the galvanized in place. $2,800 was the line on the spreadsheet. Reasonable on paper.
The rough-in inspection caught galvanized in the basement ceiling feeding the kitchen, and one of the joints we opened to install the transition fitting was pre-1986 lead-soldered copper at the old water heater connection. Inspector promoted the scope: full galvanized-to-PEX conversion, plus lead-free-solder remediation on three adjacent joints (per the SDWA 1986 lead ban + EPA LCRR), plus a 2-day delay for the inspector return. The $2,800 partial budget became $9,400 actual — full-house PEX A home-run, manifold install, three slab cuts to reach the master bath supply that had been buried under the original 1955 pour, and the remediation labor. The deal penciled because we'd budgeted 15% contingency on the rehab; without that we'd have eaten the delta.
The discipline I'd wire into any pre-1965 budget now: assume full-house repipe on any home with confirmed or suspected galvanized; assume partial-branch-minimum on any pre-1986 home where the scope touches an existing joint; only quote repair-only-scope on homes where you've confirmed copper Type L or PEX is end-to-end visible. If the home has a separate main water line issue upstream of the manifold, that's a different scope with its own cost band and a utility-side coordination overhead. The cost of being wrong on the partial scope is much higher than the cost of being wrong on the full scope.
What drives the cost — line by line
The headline repipe number is the sum of seven lines. Each line moves on different inputs, which is why the “$4-7 per linear foot” cost-guide approximation runs aground on real properties. The calc engine sums these explicitly; here's the editorial walkthrough.
- Supply piping. PEX A/B: $0.50-1.20 per linear foot in material; copper Type L runs 3-4× that. Labor: $4-8 per linear foot for PEX home-run install, $8-15 for copper sweat joints. The single biggest variable here is run-length — measured house-to-fixture, not square footage.
- Fittings + manifold. PEX manifold $200-500 depending on port count + brand (Viega, Uponor, Sioux Chief). Brass push-fit fittings $5-20 each; copper soldered fittings $8-15 each. A typical 2-bath 2,000 sqft home pulls 40-80 fittings on a full repipe.
- Fixture rough-ins.$150-400 per fixture rough-in for supply + waste connection. Bath count and kitchen count drive this directly. Fixture-grade choices (chrome stops, quarter-turn vs multi-turn) are normalized in the calc — the spec creep here is comparable to electrical's fixture allowance.
- Drain piping (only on full-house scopes OR when cast-iron-drain flag is set). Cast iron $40-80/lf material + $12-20/lf labor; PVC schedule 40 alternative $3-8/lf material. Most residential repipes leave drain side alone unless the cast iron is visibly failing.
- Main line replacement (only on main-line and full-house scopes). $80-150/lf for main supply line, PEX or copper, depending on whether the run is street-to-meter (utility/ROW territory) or meter-to-manifold (homeowner territory). The utility side typically requires a separate quote, separate permit, and street-cut bond — $1,500-$5,000 typical Chicago-metro additional.
- Permit + inspection. $50-200 in fast jurisdictions, $100-400 typical, $300-1,200 in strict jurisdictions with separate water-department review. Chicago municipal vs Cook-County-suburban vs Lake-County jurisdictions move significantly on this line.
- Slab cut + repair (only when slab-foundation flag is set + scope is partial-branch or larger). $40-80 per square foot of slab opening; usually 2-4 sqft per access point. A typical slab-foundation full-house repipe needs 4-8 access cuts.
Where this number breaks down
The traps that put the budget on the wrong side of reality:
- Wall repair lives outside the repipe line. When a plumber fishes through finished drywall, the resulting patch + paint work is its own scope and runs roughly $1.50-3 per square foot of affected wall area. On a finished-walls repipe, the wall-repair line can be 25-40% of the plumbing line itself. Cost-guide aggregators reliably exclude this.
- Water heater connections aren't a separate line. The flexible supply + shutoff at the water heater is folded into fixture rough-ins above. But if the water heater itself is end-of-life and you're opening the supply lines anyway, the marginal cost of replacing the heater during the same labor visit is much lower than scheduling it separately. Worth pricing as a combined scope.
- Pressure-reducing valve (PRV) replacement.PRVs fail predictably at 7-12 years. If you're opening the supply system on a home over 10 years old, replacing the PRV during the same labor visit is $50-150 marginal cost; a separate visit later is $300-500. Budget the PRV at scope-bid time, not at warranty-expiration time.
- Backflow preventer requirements3. IPC 605 requires backflow prevention on certain residential connections — irrigation tees, hose bibs in select jurisdictions, water-heater recirculation pumps. Inspectors increasingly require backflow preventers on full-house repipes even when the existing system didn't have them. $50-200 in materials + $100-200 install; it's a cost-guide-aggregator omission.
- Strict-jurisdiction permits double the calendar window. A repipe in a clean jurisdiction is 1-2 weeks of permit-and-inspection calendar time on top of the labor days. A repipe in a strict jurisdiction with a separate water-department reviewer is 4-6 weeks. Calendar time is a real holding-cost line on a flip; budget the strict-permit flag on properties in stricter Chicago-metro suburbs.
Frequently asked
How much does it cost to repipe a house in 2026?
A full-house repipe runs roughly $4,500-$15,000 with most 1,500-2,500 sqft homes landing in the $7,000-$12,000 band — material choice (PEX A/B vs copper Type L), fixture count, slab-vs-basement access, and whether the drain side gets touched in the same scope all move the number. Per-linear-foot crosses-check around $4-12/lf for supply runs on PEX, $12-25/lf on copper, anchored on Uponor / SharkBite / Apollo manufacturer install guides and MCAA (Mechanical Contractors Association) labor benchmarks. The single biggest variable isn't square footage — it's which scope category your property falls into.
What's the difference between a full-house repipe and a partial repipe?
Full-house replaces every supply line from the manifold (or main shutoff) out to every fixture, plus typically the manifold itself and major shutoffs. Partial branch repipes touch a specific zone — usually one bathroom cluster, a basement reno, or a single problem branch — and leave the rest of the existing piping in place. Cost gap is roughly 3-4× ($2,000-$4,000 partial branch vs $7,000-$12,000 full on a typical 1,800 sqft home), but the trap is that galvanized or polybutylene anywhere in the system force-promotes you to full-house: an inspector won't sign off on a partial repipe that leaves systemically-failing material behind un-touched walls.
When does a house actually need repiping?
Three triggers in rough order of inspection-grade urgency: galvanized supply lines (pre-1960 stock; corrosion is internal so pressure drops before leaks visible), polybutylene piping (1978-1995 — class-action settlement history, insurance carriers flag), and copper with pinhole-leak history (sign of acidic water + aged Type M; whole-system replacement is usually cheaper than chasing pinholes). Lead-soldered copper joints on pre-1986 homes don't automatically need repipe, but any time you open a joint during partial work the Safe Drinking Water Act 1986 lead ban + EPA Lead and Copper Rule (LCRR) trigger remediation requirements — if disturbed, scope creeps fast.
How long does a repipe actually take?
Rough rule: 3-7 working days for a full-house repipe on a 1,500-2,500 sqft home with normal access (basement, crawl space, or open framing). Stretches to 2-3 weeks when fishing through slab foundations or finished walls — every slab cut adds 1-2 days for cutting + repair, and lath-and-plaster pre-1950 walls turn every supply run into a labor event. Permit + inspection windows add 1-2 weeks in clean Chicago-metro jurisdictions; strict jurisdictions with separate water department review push to 4-6 weeks. The water shutoff itself is 4-8 hours mid-project; plan accordingly.
PEX vs copper for repipe — which is right?
PEX A (Uponor cross-linked) and PEX B (SharkBite, Apollo) dominate residential repipe in 2026 — material cost is 60-70% lower than copper Type L, install labor is faster (manifold + home-run is one tool + one fitting style), and freeze resistance is genuinely better. Copper Type L still wins on: exposed runs where UV matters, very high-pressure systems (rare residential), and resale optics on luxury-tier homes where buyers expect copper. The honest answer: PEX A is the default for full-house repipe; copper Type L only when there's a specific reason. CPVC sits in the middle and rarely earns the labor.
Can I repipe my house myself?
Most jurisdictions let owner-occupants pull their own residential plumbing permit on a primary residence. The permit is the easy part. Passing the rough-in inspection — pipe slope, supply-line sizing per UPC 604, water heater connections, backflow per IPC 605, pressure testing per IPC 312 — is where DIY repipes get rejected. Insurance carrier rules vary; some void policies on owner-installed plumbing post-flood. For investor flips and rentals, almost no jurisdiction allows owner-installed work — licensed plumber required. The realistic DIY path is for a small partial branch (one bathroom, one zone) on a primary residence with a pre-arranged inspector check-in.
What I'd do next
- Run your own scope-mode budget
Five scope modes + six property leak flags. Returns a feasibility band + Inspection Reality output that surfaces force-promotion before you bid.
- Wire the plumbing line into a full gut-rehab budget
The gut-rehab calc treats plumbing as one of fourteen lines; use this when the repipe is part of a larger scope decision.
- Add the calendar weeks for permit + inspection
The cost number is half the answer; the calendar window is the other half. Strict permits + slab cuts can stretch a project 3-5 weeks past the labor day count.
Once the repipe scope is locked, the next decision is whether the plumbing line fits inside the larger rehab budget — and whether the timeline works with your construction loan. Run the gut-rehab and timeline calcs alongside this one for the full picture.
- 1. Cox v. Shell Oil Co. — the $1.1 billion polybutylene class-action settlement (1995) over PB supply-line failures attributed to chlorine-induced degradation of the acetal-resin fittings. Administered by the Consumer Plumbing Recovery Center (CPRC). Claim-filing window closed in 2009; modern PB owners pay out-of-pocket for replacement. ↩
- 2. Safe Drinking Water Act 1986 amendments — the federal lead ban requiring lead-free solder + flux + plumbing fittings on potable-water systems — and the EPA Lead and Copper Rule (LCRR) covering remediation of disturbed lead-soldered joints on pre-1986 copper supply systems. (IPC 312 is system pressure testing, not lead chemistry, and is not the legal basis for lead-free-solder requirements.) ↩
- 3. International Plumbing Code §605 (Water Supply & Distribution) — anchor for backflow preventer requirements on residential connections with potential cross-contamination points (irrigation tees, water-heater recirculation, etc.). ↩
By James Wu. Per-scope cost bands are SiteworkMath planning ranges informed by manufacturer install guides — Uponor PEX A, SharkBite PEX B, Apollo PEX A/B, and Mueller copper Type L/M spec sheets — combined with MCAA (Mechanical Contractors Association) labor unit publications and regional Chicago-metro permit fee schedules. Code references are UPC 2024 (Uniform Plumbing Code) §604 (Water Distribution), §605 (PEX Installation), §609 (Drain Pipe), and IPC 2024 (International Plumbing Code) §312 (Tests), §605 (Water Supply & Distribution). Real-flip operator note from a Chicago-metro 2018 bank-owned rehab; cited by region only per the site's privacy convention. Engine logic in lib/sitework/plumbing/plumbing.ts. Not contractor-bid pricing — the budget I'd use to decide walk, bid, or kill before calling licensed plumbers. Full methodology.