Buyers GuideUpdated July 15, 2026
In Franklin Park, many homes from the 1950s and 60s were built with just one main bathroom, which can create daily bottlenecks for families and guests. Adding a second bathroom is a big upgrade, but it brings plumbing challenges that go far beyond picking tile and fixtures. Our crew has remodeled plenty of these homes and seen what goes wrong when shortcuts are taken or when old plumbing isn't considered.
Why Second Bathrooms Are a Smart Addition
For anyone living in a single-family home or duplex around here, a second bathroom isn't just about comfort. It adds real value to your property and can make a big difference at resale time. It also means less waiting, fewer morning conflicts, and a backup if you run into a plumbing problem with your main bath. In older Franklin Park houses, plumbing upgrades often become necessary as part of any serious remodel due to original galvanized steel or cast iron piping, which is known for rusting or clogging over time.
Checking Your Existing Plumbing System
The first thing our team does is assess the existing water supply and drain lines. Many local homes have a mix of newer copper, some aging galvanized, and cast iron drain stacks. Not all systems are sized for the extra load of another toilet, sink, and shower. That means checking both the main water line and the main drain stack for capacity, and for signs of corrosion or blockages. If you have older galvanized supply lines, it's common to need partial or full repiping for reliable flow and pressure, especially with added demand.
- Measure existing pipe diameter and inspect for scale buildup or leaks.
- Check main drain slope and capacity, clay-rich soils in Franklin Park make proper slope critical to prevent slow drains.
- Inspect venting to avoid sewer gases; older homes often lack proper vent stacks for added fixtures.
- If the new bathroom is in the basement, look for signs of seepage or water table issues, especially with the Des Plaines River nearby.
- Test water pressure at multiple points to see if your line can handle another bathroom without pressure drops.
Basement vs. Main Floor Additions
Adding a second bathroom in the basement is common in this area because many homes have unfinished or partially finished basements. With high water tables and clay soils, sump pits and pumps are standard features. If you plan to install a below-grade bathroom, you'll likely need a sewage ejector pump in addition to your main sump pump system. Homes here aren't always set up for gravity drains below the main sewer line. We also look for existing floor drains and check if the sewer line has enough drop to handle basement fixtures.
If you're thinking about a main floor addition or using space from an old closet or laundry room, stub walls and access to existing drain stacks will shape the complexity and cost. We often see cast iron stacks in mid-century homes, and working with these requires careful cutting and proper fittings to avoid future leaks or code issues.
Planning Water Heaters and Hot Water Supply
Adding a bathroom increases hot water demand. We check if your current water heater is big enough for two bathrooms running at once. A lot of homes in Franklin Park have 40-gallon tanks, which might struggle with two showers back-to-back. Our water heater service team can size up your needs and recommend a solution, such as a tankless water heater or a larger tank. We also advise on upgrading supply lines and checking for older shutoff valves that need replacement.
Permits, Codes, and Practical Steps
Cook County and the Village of Franklin Park require permits and inspections for bathroom additions. That means everything, especially new drain and vent lines, must meet modern codes, including correct pipe slope, venting, and fixtures with approved backflow prevention. It's common to find surprises in the walls or under floors of older homes, like hidden tee fittings or patched-in lines. Our crew always checks for these before starting demolition.
Typical steps for a second bathroom addition include:
- Site inspection and code review
- Assessing and, if needed, replacing main supply and drain lines
- Planning venting routes, especially if the roof stack is hard to reach
- Cutting concrete and trenching for new drains (basements)
- Connecting to the existing hot and cold water and testing for leaks
- Installing new fixtures; see our fixture installation service if you want professional hookup
- Pressure-testing and inspection by the village
Common Pitfalls and How We Avoid Them
We often find hidden issues during these projects. For example, older clay-tile sewer lines are prone to root intrusion, which can cause blockages when new drains are added. That's why a sewer camera inspection is often needed before tying in a new bath. If you haven't maintained your drains, a professional drain cleaning is smart before finishing a remodel. Leaks from old fittings or missed connection points behind finished walls can lead to water damage, our leak detection and repair team uses pressure tests and inspections before closing up new walls.
Every addition brings its own surprises, but local experience with Franklin Park's flat terrain, high water table, and mix of older building materials helps us plan these jobs right. We know what tends to go wrong and build that into our process from the start.
If you're considering adding a second bathroom in your Franklin Park home, give our team a call at 224-268-1723. We can walk you through the process, inspect your current system, and help you avoid common headaches.