Basement Renovation · Cambridge
Basement Bathrooms in Cambridge
Basement bathrooms for Cambridge homes — from a three-piece off the rec room to the full bath a legal apartment needs, including the plumbing below the slab.
The good news for most Cambridge homeowners in newer areas is that the builder left a bathroom rough-in in the slab — three capped pipes in a corner of the basement in most Hespeler, Clemens Mill and Fiddlesticks homes built since the 1990s. If you have that, a basement bathroom is a very manageable job. If you don't — which is the case in almost every Preston bungalow and Galt century home — we break the slab, run a new drain to the stack, and either tie into gravity drainage or install a sewage ejector pit where the basement sits below the sewer line.
We also plan basement bathrooms around Cambridge's water reality: a backwater valve if the home is in an older part of Galt or Preston where sewer backups happen, and a floor drain that isn't going to become the entry point for the next one.
What's included
- Using the existing rough-in, or cutting the slab and running new drain, vent and supply
- Sewage ejector or macerating system where gravity drainage isn't possible
- Shower or tub-shower with a proper waterproofing membrane behind the tile; curbless where you want it
- Toilet, vanity, exhaust fan vented outside (not into a joist bay), lighting and GFCI
- Framing, insulation and drywall to make it a room, not a corner
- City of Cambridge plumbing and building permits
Below-the-sewer basements
Parts of Preston and downtown Galt sit low enough that the basement floor is below the municipal sewer. A gravity drain won't work; a sealed ejector pit with a pump does, and it's a standard, reliable piece of equipment when it's installed right. We size it for the fixtures you're adding and give it its own circuit.
Ceiling height and the shower
In a low Preston basement, the shower is where headroom bites — a standard shower head needs clearance. We use a curbless base, a low-profile drain and a ceiling-mounted or angled head so a 6'10" basement still gets a usable shower.
Frequently asked questions
How do I know if my basement has a bathroom rough-in?
Look for capped pipes sticking up out of the slab, usually near the stack or an exterior wall — a larger one for the toilet and one or two smaller ones. Most Cambridge homes built after about 1990 have them.
Is a sewage ejector noisy or unreliable?
A properly installed sealed ejector runs briefly a few times a day and is barely audible from the next room. We use units with an alarm and put them on their own circuit.
Can a basement bathroom be part of a legal apartment?
Yes — a full bathroom is required for a legal unit, and we build it to the same code standard as the rest of the suite.
Serving Cambridge and surrounding areas. Contact us for a free, no-obligation quote specific to your project.