Why It Matters
Plumbers are one of the most critical—and often most expensive—contractors you'll hire as a real estate investor. They work on supply lines, drain-waste-vent (DWV) systems, water heaters, fixtures, and gas lines. Licensing requirements vary by state, but most jurisdictions require a licensed plumber for any permitted work. Budget roughly $75–$150 per hour for labor, with major projects running into thousands. Vetting plumbers carefully before your first deal saves you significant money and headaches down the line.
At a Glance
- Handles water supply lines, drain systems, water heaters, fixtures, and gas piping
- Licensing tiers typically include apprentice, journeyman, and master plumber
- Hourly rates range from $75 to $150+; project minimums often start at $150–$300
- Permitted plumbing work requires inspections and must meet local code
- A reliable plumber is one of the highest-leverage relationships in your contractor network
How It Works
Plumbing systems in a property split into two main categories: supply and drain-waste-vent. Supply lines bring pressurized hot and cold water from the main shutoff to fixtures throughout the building. The DWV side removes wastewater and vents sewer gases safely out through the roof. A plumber works on both sides—and on the gas distribution system if the property uses natural gas or propane for appliances, heating, or water heating.
On a rehab or new construction project, plumbing work happens in two distinct phases tied to the plumbing rough-in stage. Rough-in is the first phase, where all pipes are run through walls and floors before drywall goes up. It's the labor-intensive, lower-glamour work that determines the entire system's quality. Finish plumbing—the second phase—involves connecting fixtures, setting toilets and tubs, installing water heaters, and making everything functional. Both phases typically require a plumbing inspection before work can be covered or considered complete.
The type of plumber you need depends on the scope of work. A master plumber carries the highest license and can pull permits, run a plumbing business, and oversee other plumbers. A journeyman plumber is fully licensed to do the work but typically operates under a master's license for permit purposes. For larger rehabs or bathroom renovation and kitchen renovation projects, always hire a licensed plumber who can pull permits—unpermitted plumbing work can kill a refinance, trigger issues at resale, and create liability if something fails. For a simple faucet swap in a tenant-occupied property, a handyman may suffice depending on local rules.
Real-World Example
Marcus picked up a 1940s duplex for $185,000 and budgeted $28,000 for the full rehab. His plumber walked the property during due diligence and flagged original cast iron drain lines throughout—functional but showing corrosion, and a liability for a rental. Marcus got three bids. The lowest came in at $6,200 but the contractor couldn't pull a permit. The middle bid was $9,800 from a licensed master plumber who would replace all the cast iron with PVC, repipe the supply lines from galvanized to copper, and install two new water heaters. Marcus went with the licensed contractor. The inspection passed clean. At the refinance six months later, the appraiser specifically noted the updated plumbing system—Marcus's lender would not have funded against the property with unpermitted work on record.
Pros & Cons
- A strong plumber relationship gives you fast response times and honest assessments on properties you're evaluating
- Permitted plumbing work protects your investment at refinance, sale, and during insurance claims
- Master plumbers can identify problems during walkthroughs that untrained eyes miss entirely
- Bundling multiple properties with one contractor often yields volume pricing and scheduling priority
- Proper plumbing upgrades—new water heater, repiped supply lines—reduce tenant complaints and emergency calls dramatically
- Plumbing labor is expensive; hourly rates and project minimums can make small repairs disproportionately costly
- Scheduling reliable licensed plumbers in tight markets can mean waiting days or weeks for non-emergency work
- Scope creep is common once walls open—what starts as a single leak often reveals broader systemic issues
- Unpermitted previous work discovered mid-project can force expensive remediation before new work can proceed
- DIY-happy sellers sometimes install plumbing incorrectly; you inherit those problems at closing
Watch Out
Always verify the plumber's license with your state licensing board before signing a contract. License lookup tools are free and take under two minutes. Unlicensed operators may offer lower bids but cannot pull permits, may carry no insurance, and leave you legally exposed if their work causes water damage to the property or an adjacent unit. This is non-negotiable for any permitted scope of work.
Get itemized bids, not lump-sum quotes, for any project over $2,000. A lump-sum quote gives you no visibility into what you're paying for labor versus materials and makes it nearly impossible to compare bids accurately. An itemized bid breaks out fixture costs, linear feet of pipe, labor hours by phase, and permit fees. When bids diverge significantly, the itemization shows you exactly where and why—sometimes revealing that one contractor is planning to cut corners on material quality.
Be careful with plumbing work that touches the electrical upgrade scope on older properties. In pre-1980 homes especially, moving pipes can expose knob-and-tube or aluminum wiring that now requires attention. A plumber who pulls a wall to repipe supply lines may uncover electrical hazards that need their own permit and licensed electrician. Budget a contingency of 15–20% on any plumbing project in a property built before 1970, and coordinate your plumber and electrician closely to avoid duplicating demo and drywall costs.
Ask an Investor
The Takeaway
A licensed plumber is one of the most important contractors in your investment operation. The relationship compounds over time—a plumber who knows your properties, knows your standards, and knows you pay on time becomes a genuine competitive advantage. Prioritize licensed, permitted work even when it costs more upfront. The protection it provides at refinance, resale, and in liability scenarios is worth every dollar.