Cast Iron Plumbing on a 1960s Dallas Duplex – Deal Breaker or Manageable?

Question

My husband and I are under contract on a duplex in the Dallas area, and we’re trying to decide how concerned we should be about the cast iron plumbing.

The duplex was built in the late 1960s and still has its original cast iron drain lines. During the inspection, a few issues came up, and we’re planning to have the sewer lines scoped. We also know the property will need renovations (flooring, kitchens, bathrooms, HVAC, etc.), so we’re trying to determine whether replacing the cast iron should be part of the renovation or if it’s something that can often last longer with spot repairs.

For those of you who own older duplexes in Dallas or other Texas markets:

• How common is it to have to replace all of the cast iron plumbing?
• What were the signs that replacement was necessary versus just repairing sections?
• If you replaced everything, what was the approximate cost for a duplex?
• Did you replace it proactively during renovations, or wait until there were major problems?
• Is there anything specific we should ask the plumbing company when they do the camera inspection?

We’re planning to hold this property long term, so we’d rather make the right decision now than deal with constant plumbing issues later. We’d love to hear your experiences and any advice before moving forward.

Diego Alvarado · Answer

When there is cast iron, I will always budget to replace it. Even when you can see that there is no leak, that does not mean that a leak will show up soon.

You have to have a licensed plumber to inspect the pipes, make sure that they do a proper job, as cast iron scope inspection is difficult for many reason and sometimes plumbers try to cut corners. I have seen that happen a few time now.

Matthew Irish-Jones · Answer

I don't know anything about the Texas market, but managing 800 rental is Buffalo NY I can tell you our #1 expense is plumbing... and 95% of that is cast iron drain lines.  Plan to replace them when you do your reno.

Ashish Acharya · Answer

Cast iron plumbing would not automatically make this a deal breaker, but I would underwrite the property as though a full replacement could be required until the camera inspection proves otherwise. Ask the plumbing company for the complete footage, a map of the affected lines, the location and severity of every defect, and separate written estimates for spot repairs versus full replacement. I would also get a second opinion before releasing the inspection contingency.

Since you are planning to hold the duplex long term, compare the worst-case replacement cost, tenant disruption, and a reasonable contingency against the purchase price and projected cash flow. If the deal still works under that scenario, or the seller provides an appropriate credit or price reduction, the plumbing may be manageable rather than a reason to walk away.

From the tax side, have the contractors separately itemize the plumbing, HVAC, flooring, kitchen, and bathroom work. Replacing a major component of a building system is generally treated as a capital improvement rather than an immediately deductible repair, and depreciation begins once the property is ready and available to rent. If an existing component is removed after the property has been placed in service, a partial disposition election may sometimes allow the remaining basis of that retired component to be recognized as a loss.

Happy to connect!

Richard F. · Answer

Based on age alone, for all the other anticipated work you are planning, you absolutely should replace the lines...all the way to the municipal connection.

At that age, you are highly likely to find hairline cracks along the bottom of several sections, due to internal scaling which physically expands the pipe. Similar to the action of corroded rebar in concrete. What you see is the tip of the iceberg. Additionally, you will have increasingly frequent leaks and stoppages. Solution? Tear out some of those new upgrades to get at the old pipes to make the repair. That can include walls, cabinets, concrete floors, and ceilings.

Bruce Woodruff · Answer

Yes...figure this into your overall budget. This is one of the largest cost items in any construction budget... get a estimate from a licensed plumber right up front so you know.

Cast Iron Plumbing on a 1960s Dallas Duplex – Deal Breaker or Manageable?

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