Basement Bathrooms in Overland Park, KS: Remodels, Additions & Plumbing
Overland Park Basement Pros has finished basements across Overland Park for over a decade, and most of the 30+ basements we finished in 2025 included a new bathroom. We start by finding your drain line, using an existing rough-in when you have one and cutting the slab or adding an ejector pump when you don’t.
Every shower gets a waterproof membrane behind the tile, and every bathroom gets an exhaust fan vented outside so moisture never sits in your basement. We handle all Overland Park plumbing permits and inspections, and basement bathrooms typically run $8,000 to $25,000.
Overland Park Basement Pros provides basement bathroom remodeling to surrounding Overland Park, Kansas cities including Fairway, Kansas City, Leawood, Lenexa, Merriam, Mission, Mission Hills, Olathe, Prairie Village, Roeland Park, Shawnee, and Westwood.
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Types of Basement Bathrooms
Full Basement Bathrooms
A full bathroom has a toilet, a sink, and a bathtub or tub and shower combo. It is the most flexible choice for families, since it works for young kids who need baths, overnight guests, and anyone who would rather soak than shower.
A full bath also adds the most value when you sell, especially paired with a basement bedroom. It takes more space and plumbing than smaller baths, and basement bathrooms typically run $8,000 to $25,000 depending on layout, fixtures, and how much drain work is needed.
Three-Quarter Baths with Walk-In Showers
A three-quarter bath swaps the tub for a walk-in shower, giving you a toilet, sink, and shower in a smaller footprint. It is the most popular layout we build because it fits more basements and costs less than a full bath.
You can choose a fully tiled shower with a glass panel for a custom look, or an acrylic shower base for a quicker, lower-cost install. A low or curbless entry makes the shower easier for older family members to use and simpler to keep clean.
Half Baths & Powder Rooms
A half bath has just a toilet and a sink, so it fits in a small corner without taking space from your main living area. It is the perfect add near a family room, home theater, or basement bar, so nobody has to run upstairs mid-movie or mid-game.
With no shower or tub, the plumbing is simpler and the job moves faster. If your basement sits below the sewer line, a compact ejector pump or upflush toilet handles it. A pedestal sink keeps the room open, while a small vanity adds storage.
Guest Suite Bathrooms
A guest suite bathroom pairs a full or three-quarter bath with a basement bedroom. It gives in-laws, guests, or grown kids their own private space on the lower level, so they can come and go without sharing a bathroom upstairs.
We place the door inside or right next to the bedroom and add sound insulation in the shared walls for privacy. A heated tile floor takes the chill off concrete, and the adjoining bedroom gets an egress window so the whole suite counts as a legal bedroom.
Basement Bathroom Plumbing & Moisture Control
Using an Existing Rough-In
Many newer Overland Park homes were built with a plumbing rough-in, usually capped drain pipes sticking up from the basement floor near a wall. If your basement has one, it is the fastest and least expensive way to add a bathroom, since the drain is already in place.
We check the rough-in’s size and condition before planning around it, and we run a camera through older lines when needed. A rough-in does set where the toilet and shower go, so if your ideal layout is elsewhere, we price both options so you can decide.
Slab Cutting & Gravity Drains
When there is no rough-in and your main sewer line runs below the basement floor, we can usually drain the bathroom by gravity. We saw-cut a trench in the concrete, lay new drain pipe sloped downhill at least a quarter inch per foot, and tie it into the main line.
Before we patch the floor, we test the new lines for leaks and have them inspected. Then we fill the trench with fresh concrete. Gravity drains have no moving parts, so once they are in, there is nothing to maintain or replace later.
Ejector Pumps & Upflush Toilets
If your sewer line leaves the house above the basement floor, waste has to be pumped up to reach it. An ejector pump sits in a sealed basin set into the floor and can handle a full bathroom, including a shower, sink, and toilet.
An upflush toilet has a small pump built into a box behind the toilet, so it needs little or no slab cutting. It works well for a half bath or tight budget. For ejector pumps, we recommend a high-water alarm and battery backup, since storms that knock out power often raise water levels too.
Basement Bathroom FAQs
Basement bathrooms typically run $8,000 to $25,000. A half bath on an existing rough-in sits at the low end, while a full bath that needs slab cutting, an ejector pump, and custom tile sits at the high end. We give you a written estimate after seeing your basement.
Yes. Adding a bathroom requires plumbing and electrical permits, and inspectors need to see the work before the walls are closed up. We pull the permits and schedule every inspection, so your new bathroom is documented and ready when you sell.
Yes. We cut a trench in the concrete, run new drain and vent lines to your main sewer line, and patch the floor. If the sewer line sits too high to drain by gravity, we add an ejector pump or upflush toilet instead.
Only if your main sewer line leaves the house above your basement floor. If it runs below, the bathroom can drain by gravity with no pump at all. We check your drain depth early so you know which option you need before the design is set.
Most basement bathrooms take a few weeks from start to final inspection. A half bath on an existing rough-in moves faster, while a full bath with slab work and tile takes longer. We give you a schedule before work begins and keep you updated if anything changes.