Louisville Addition Plumbing: First-Floor Suites, Laundry Rooms and Garages

First-Floor Primary Suites

Moving the main bedroom to the ground floor is one of the most popular additions for people who plan to stay in their homes for decades. The bathroom is the plumbing-heavy part: a shower, often a double vanity, a toilet and sometimes a tub. The addition usually sits on a crawl space or a slab, which affects how drains are run and protected from cold.

We plan drain routes back to the existing building drain, decide whether the new bathroom can share the house's existing vent stack or needs its own, and size the supply so a shower in the new suite does not lose pressure when the kitchen faucet runs.

Bringing Laundry Up From the Basement

Plenty of Louisville homes have the washer and dryer in the basement. A main-floor laundry room is a common part of a mudroom or kitchen addition. Moving laundry upstairs involves more than a new outlet box:

• A washer box with hot and cold supply and a properly trapped, vented standpipe
• A drain pan with a drain line, since a washer leak now sits over finished space
• Gas piping and a vent route if the dryer is gas
• Optional quarter-turn auto-shutoff valves or a leak sensor
• A utility sink, which is easy to add while the lines are open

When the Water Heater or Gas Lines Are in the Way

Additions sometimes cover the spot where the gas meter, water heater vent or main water line sits. When that happens, those components have to move before or during construction. Relocating a gas meter involves the utility and can take time, so we flag it at the planning stage. A water heater that has to move may be a good opportunity to upgrade capacity or switch types. Our natural gas line page covers rerouting and new gas runs for added appliances.

Garages, Workshops and Floor Drains

New or enlarged garages are a frequent Louisville project. Adding a hose bib inside, a utility sink, or a heater for a workshop is easiest during framing. Floor drains are worth discussing before the slab is poured; where allowed, they make washing off winter salt and slush much easier, but they need an approved discharge point. In areas where groundwater is an issue, the addition's footings and drainage may also tie into a sump system, covered on our sump pump installation page.

Coordinating the Addition

Because we are close by, we can easily meet the builder on site for layout, come back for the under-slab or crawl space work, then rough-in and trim. Each stage is tested before the inspector's visit. Homeowners comparing quotes can use our competitive bid option, and fixture choices for new rooms are covered on our plumbing installation page. For the overall process, see our construction plumbing hub.