Add a full or half bath downstairs — including the below-grade plumbing most homeowners don't think about. We handle the part that makes a basement bathroom actually work.
Adding a bathroom below grade is mostly about the plumbing you can't see. We handle the full build, from the drain under the slab to the tile on the wall.
A finished basement without a bathroom is a room you visit. A finished basement with one is a floor you live on — usable for guests, a teen suite, a rec room, or an in-law setup without a trip upstairs.
It's also what makes a basement bedroom or apartment truly functional. A guest suite or rental needs its own bath to be worth the name, and adding one is often the difference between 'extra space' and a true second living area.
Done right, a basement bath adds real day-to-day convenience and supports your home's value — especially when it turns an unfinished or single-purpose basement into flexible living space.
Most projects combine a few of these into one cohesive lower level — our design-first process makes sure they work together.
Raw concrete and framing to complete, code-compliant living space — start to finish.
Learn moreReconfigure or modernize an existing finished basement into something better.
Learn moreCode-compliant egress windows for a safe, legal, light-filled basement bedroom.
Learn moreMedia rooms, wet bars, and home gyms — wired, soundproofed, and laid out right.
Learn moreSeparate-entrance suites and ADUs that add flexible, rentable space.
Learn moreTell us how you want to use the space and we'll help you plan the right approach.
Call (720) 340-2032Can you even add a bathroom down there? Almost always, yes — even when there's no existing plumbing. When the basement floor sits below the home's main sewer line, waste can't drain by gravity, so we install a sealed ejector pump (or use an up-flush system) that lifts it to the sewer. It's a routine solution, and it's the single biggest thing that makes a basement bathroom possible.
What it costs. A basement bathroom in the Boulder area commonly runs about $10,000 to $25,000, depending on whether it's a half or full bath, how far it sits from existing plumbing, whether an ejector pump is needed, and finish level. Locating the bath near existing stacks helps control cost. We give you an itemized estimate after seeing the space.
We see the actual space, talk through your goals, and measure. No pressure, no charge.
We turn the conversation into a real plan and a clear, line-by-line estimate.
We pull permits and build, managed start to finish by one accountable team.
We confirm every detail with you and hand over a space that's ready to use.
Yes. When the basement floor is below the main sewer line, we install a sealed ejector pump or up-flush system that lifts waste up to the sewer, so a bathroom works even with no plumbing roughed in. It's a routine, proven solution.
Most basement bathrooms run about $10,000 to $25,000, depending on full vs. half bath, distance from existing plumbing, whether an ejector pump is needed, and finishes. We give you an itemized estimate after seeing the space.
Yes. Adding plumbing, electrical, and ventilation for a bathroom requires permits and inspections. We handle the permitting so the work is code-compliant and on the record.
On its own, a basement bathroom typically takes a couple of weeks, depending on plumbing complexity and finishes. As part of a larger finish or remodel, it's folded into the overall schedule.
It depends on how you'll use the space. A half bath (toilet and sink) is enough for a rec room or office; a full bath with a shower is worth it for a guest suite, bedroom, or basement apartment. We help you weigh cost against use.
Not when it's built correctly. Proper waterproofing, a correctly ducted exhaust fan, and a sealed ejector system keep a below-grade bathroom dry and fresh.
Schedule a free, no-pressure in-home estimate. We'll measure your space and give you a clear, itemized quote.
(720) 340-2032Free, no-pressure in-home estimates across Boulder
