Cost to Replumb a House in South Florida: Polybutylene, Galvanized and Cast Iron Pipes Before You Sell

The cost to replumb a house often lands in the five figures, and for South Florida sellers it can decide whether a buyer can even get insurance. Many older homes in Palm Beach County and Port St. Lucie still have polybutylene supply lines, galvanized steel pipes or cast iron drains. Inspectors flag them. Insurers ask about them on the four-point form. And buyers use them to push for a lower price. This guide covers which pipes cause trouble, how insurers and buyers react, what replumbing costs, and how to choose between fixing, crediting or pricing it in.

Key takeaways

• This Old House puts whole-house plumbing work at $10,000 to $20,000 on average. Your quote depends on size, layout and pipe material.
• Polybutylene was made from 1978 to mid-1995, according to InterNACHI. Citizens does not write new policies on most homes over 20 years old with polybutylene under its standard homeowner forms.
• Citizens requires a four-point inspection for homes more than 20 years old, and the form asks what type of pipes the home has.
• Replumbing before you list widens your buyer pool. A credit or price change can work when time or cash is short.
• Use a licensed plumber, pull any required permit and close it before closing.

What drives the cost to replumb a house

A replumb usually means replacing the water supply lines that run from the meter to every fixture. Sometimes it also means drain lines. The price swings with a few factors.

• Size and fixture count. More baths and more fixtures mean more pipe and more labor.
• Pipe material. Plastic options like PEX tend to cost less than copper.
• Access. Many South Florida homes sit on concrete slabs, so pipes often run through walls and attics. Crews open drywall to reach them.
• Drywall and paint. Patching and painting after the work can be a real part of the bill.
• Drains. Replacing drain lines under a slab is a much bigger job than replacing supply lines.

Problem pipes by era

The age of your home gives a strong hint about what is behind the walls. Still, past owners may have replaced some or all of it, so a plumber or inspector should confirm what is there.

Polybutylene

InterNACHI says polybutylene was made from 1978 to mid-1995 and went into about 10 million U.S. homes. It explains that some water disinfectants react with the plastic and cause it to flake, which leads to small cracks and then leaks. Many failures happen at joints and fittings.

You can often spot it near the water heater or under sinks. It is a flexible pipe, often gray, and may be stamped "PB2110." InterNACHI notes that no rule requires replacing it. But it also states that replacing polybutylene before it fails is far cheaper than dealing with the damage after.

Galvanized steel

Galvanized steel supply pipes were common in older homes. Over time they can rust from the inside, which narrows the pipe and lowers water pressure. Rusty water and weak flow at the tap are common signs. Because the corrosion is inside, the pipe can look fine from the outside.

Cast iron drains

Many older South Florida homes have cast iron drain lines, often under the slab. This Old House gives cast iron a lifespan of 75 to 100 years with proper care. In practice, condition varies, so the only way to know is a camera inspection. Signs of trouble include slow drains, backups and sewer smells.

How insurers react to older pipes

Insurance is where pipe type hits a sale hardest. A buyer needs a policy to close with a mortgage. So if insurers won't write the home, the deal can stall.

Citizens Property Insurance, the state-backed insurer, requires a four-point inspection for homes more than 20 years old. The four-point form covers electrical, heating and AC, plumbing and roof. For plumbing, it lists pipe types, including copper, PVC, galvanized and polybutylene. It also asks whether the system is in good working order and whether there are active or past leaks.

On polybutylene, Citizens' FAQ (updated January 2026) says homes 20 years old or newer with polybutylene may be eligible if there are no leaks, water damage or hazards. However, it does not insure homes over 20 years old with polybutylene under its HO-3, HO-8, DP-1, DP-3 and some mobile home forms. Since polybutylene went out of production in the mid-1990s, nearly every home that has it is now over 20 years old. Private insurers set their own rules, so a buyer's agent should check early.

How buyers weigh the cost to replumb a house

Most buyers learn about pipes from the inspection report or the insurance quote. By then, they have a deadline and a lender waiting. As a result, they tend to ask for a repair, a credit or a lower price.

Some buyers will walk away instead. That is more likely with first-time buyers who are short on cash after closing, and with buyers whose lender or insurer won't move forward. Cash buyers and investors are more likely to stay. But they usually price the replumb into their offer, and often with a cushion.

The market sets how much leverage buyers have. In August 2026, Palm Beach County single-family homes had 3.5 months of supply and a median of 40 days to contract, per Miami Realtors. With more homes to choose from, buyers can pass on one that needs plumbing work.

Cost to replumb a house: what national data shows

We could not find a reliable published price list for replumbing in Palm Beach County or St. Lucie County. So the figures below are national numbers from This Old House. Use them for planning, then get two or three local bids.

Supply lines

This Old House lists whole-house plumbing at an average of $10,000 to $20,000 in its plumbing cost guide, updated in June 2026. It also notes that metal pipe costs more than plastic. Ask each plumber to price PEX and copper side by side, and to break out drywall repair and paint.

Drain and sewer lines

Drain work is priced differently. In its sewer line guide, updated in March 2026, This Old House lists $50 to $200 per linear foot for traditional replacement that involves digging. For trenchless methods, including pipe lining with epoxy, it lists $60 to $250 per linear foot. Lining can mean less digging and less floor damage, though not every pipe is a good fit.

Should you pay the cost to replumb a house or offer a credit?

There is no single right answer. It depends on the pipe type, your timeline, your cash and your likely buyer.

When replumbing first makes sense

• The home has polybutylene, and you expect buyers who need Citizens or a mortgage.
• You have the cash, or can fund the work, and a few weeks to spare.
• Comparable homes nearby have updated plumbing.
• There are active leaks or signs of past water damage.

When a credit or price change works better

• You need to sell fast or can't fund the work up front.
• The likely buyer is an investor or cash buyer.
• The buyer wants to choose their own plumber or pipe material.
• The home needs other major work, and the buyer plans a full remodel.

Check loan limits on seller credits before you agree to one. Our guide to handling repair requests covers how credits, repairs and price cuts compare. Then, compare offers on your net, not just the price.

Permits and disclosure

If you replumb, hire a licensed plumber and make sure any required permit is pulled and closed. The Florida Realtors AS IS contract has a permits disclosure in paragraph 10(b). In it, the seller states they don't know of improvements made without required permits, or under permits not properly closed, except as disclosed. Paragraph 12(c) also asks the seller to help close out open permits that an inspection finds.

Disclosure applies even if you don't replumb. Paragraph 10(j) says the seller knows of no facts materially affecting the value of the property that are not readily observable and have not been disclosed. So if you know about leaks or pipe problems, talk with your agent, and an attorney if needed, about how to disclose them. Our guide to selling an older Florida home covers four-point issues in more depth.

Steps to price the cost to replumb your house

1. Find out what pipes you have. Look near the water heater and under sinks, or ask a plumber.
2. Order a pre-listing inspection and, for older homes, a four-point inspection.
3. If drains are a concern, get a camera inspection of the main line.
4. Get two or three written bids that include drywall and paint.
5. Ask an insurance agent how the pipes affect coverage for a buyer.
6. Run your net both ways: replumbed and as-is with a credit.

Frequently asked questions

What is the average cost to replumb a house?

This Old House puts whole-house plumbing work at $10,000 to $20,000 on average. Smaller homes and PEX can come in lower. Larger homes, copper and drain work can push it higher.

Will insurance cover a home with polybutylene pipes?

It is hard. Citizens does not write homes over 20 years old with polybutylene under its main homeowner forms. Some private insurers may, so a buyer should shop early.

Do I have to disclose polybutylene in Florida?

If you know about facts that materially affect value and are not easy to see, the standard Florida contract points toward disclosure. Ask your agent or an attorney about your situation.

Is the cost to replumb a house worth it before selling?

Often, for polybutylene, since it can block insurance for many buyers. For galvanized or cast iron in working order, a credit or price adjustment may be enough.

Can I sell a house with cast iron pipes?

Yes. Many homes sell with them. A camera inspection helps you price any needed work and answer buyer questions with facts.

Sources

• InterNACHI, Polybutylene for inspectors
• Citizens Property Insurance, Will Citizens insure dwellings with polybutylene pipes?
• Citizens Property Insurance, FAQs on four-point inspections
• Citizens four-point inspection form (InterNACHI copy)
• This Old House, Plumbing cost guide
• This Old House, Sewer line replacement cost
• Florida Realtors, AS IS Residential Contract for Sale and Purchase
• Miami Realtors, Palm Beach County August 2026 home sales

Older pipes and a sale on the horizon? Compare a cash offer against a full listing with a Pure Equity agent, with no obligation, and see which nets you more after repairs or credits. Talk with an agent or check what your home is worth. Buying instead? Ask a buyer's agent how to check pipes and insurance on homes in Boca Raton, Lake Worth Beach or Port St. Lucie.