PlanningTo do it right, it all starts with a plan. The design of your basement's new bathroom determines the scope of the project. Are you adding in a shower, for instance? What size are you looking at? Where in your basement is the best location? Your bathroom design will also affect whatever permits you require.
About permits: Local municipalities have different permit requirements, but for a sub-level bathroom, you will need an inspection of the finished plumbing and electrics during construction. Consult your local municipality's website for the required information.
Most recently, built homes have plumbing stubs pre-installed making installation much simpler. But not all homeowners are that lucky. For these situations, the biggest time saver is to build it under a first-floor bathroom. This provides easy access to existing utilities and drainage, which will reduce both your workload and the permits required.
Drainage, Drainage, Drainage.Not surprisingly, the biggest issue with basement bathrooms is the drainage. Above-ground plumbing can count on gravity to drain away the sewage and wastewater. In a basement that is problematic, as some drains don't have the adequate slope, or as it's called in the trade, "fall", to drain away what you want to be drained away.
This slope, or fall, is also a local code requirement, but the standard downhill slope is 1/4 in. per linear foot minimum. This is something you don't mess around with because otherwise you're in for a big mess to clean up — and a major repair.
Plumbing Rough In Step-By-Step
Shower & Sink Drain Location
Toilet Flange Location
Note: The minimum side-to-side distance for a toilet is 30 in. so plan your wall design accordingly.
Finding the Drain Pipe
Once you've exposed your drain pipe, you need to hook up to it. In newer installations, this is a simple connection, usually at the cleanout. In older homes, use a diamond-plated grinder wheel to cut through cast-iron drain pipes and use a mechanical coupling to hook up.
Hooking Up the Pipe
It's a Trap!
Tip: You don't want your traps and flange to move when you backfill and during the concrete pour. Drive a 1 ft. piece of rebar on either side of your pipe and duct tape it to your PVC.
Call for an inspection at this point.
Finishing Your Rough In
How to Terms
From bathroom decor ideas to home renovation tips, find 11 modern bathroom ideas to inspire your next bathroom renovation.
Toilet installation may not be your favourite part of your bathroom renovation, but it’s easier than you think. Check out our How to Install a Toilet Guide.