Main & 3-Piece Bathroom Renovations
The complete guide to renovating your main bathroom — tub versus shower, layout, storage, waterproofing, design choices, and cost. Everything you need to know before you start.
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What Is a 3-Piece Bathroom?
A three-piece bathroom has three fixtures: a toilet, a sink, and a bathing fixture — either a tub or a shower. It's the standard full bathroom in most homes, and it's usually the main or family bathroom that gets used every single day. A four-piece adds a second bathing fixture, so you have both a separate tub and a shower.
Unlike a powder room, a main bathroom has a wet zone — a tub or shower that has to be properly waterproofed. That's where the real engineering of a bathroom renovation lives, and it's the part you can't see once the tile is on. Done right, it protects your home for decades. Done wrong, it leaks behind the wall and rots the structure. This is the single most important reason to renovate a main bathroom properly.
Because it's the bathroom your family uses most, a main bathroom renovation is about balancing everyday function with a look you'll enjoy for years — the right layout, smart storage, durable finishes, and a bathing setup that fits how you actually live.
The Biggest Decision
Tub, Shower, or Both?
The single biggest choice in a main bathroom is what goes in the wet zone. It shapes the layout, the cost, and how the room works for your household.
Tub-Shower Combo
A bathtub with a showerhead above it. The most popular choice for a family or main bathroom — you get both bathing options in one footprint, which matters if it's the only full bath or you have young kids who need a tub.
Walk-In Shower
Dropping the tub for a larger walk-in shower gives a open, modern, spa-like feel and is easier to step into as you age. Ideal when there's another tub in the house, or for adults who simply prefer showers.
Separate Tub & Shower
A standalone tub plus a separate shower — a true four-piece. The best of both worlds if you have the space, and a strong feature for resale. Needs a larger footprint and a bigger budget.
If your main bathroom is the only full bath in the house, keeping a tub is usually the smart move for resale and for families. We'll talk through what fits your home and how you live before anything is decided.
The Part You Can't See
Why Waterproofing Matters Most
In a main bathroom, the most important work is the part that disappears behind the tile. It's what separates a bathroom that lasts decades from one that leaks in a few years.
The Wet Zone
Every shower and tub surround is a wet zone that needs a continuous waterproof barrier behind the tile. We build wet zones with a waterproof board system instead of ordinary drywall, so water physically cannot reach the wall framing.
Proven Watertight
On every shower we run a flood test before any tile goes on — the basin is sealed and filled, and held to confirm it doesn't lose a drop. We don't trust a shower pan to chance; we prove it's watertight first.
Floors That Won't Crack
Tile floors go over an uncoupling membrane that lets the house move and settle naturally without cracking your tile or popping grout lines. It's why a properly built floor still looks new years later.
Grout That Lasts
We use a polymer-modified grout that resists staining and cracking, instead of the cheap porous grout that discolours within a couple of years. The finish you choose should still look good a decade in.
This engineering is the same on every Cornerstone bathroom, whatever your budget. You can read the full material specifications on our main bathroom page.
Make It Work Every Day
Layout, Storage & Function
A main bathroom has to work hard every morning. These are the choices that make it function as good as it looks.
The Layout
Keeping the existing layout is the most budget-friendly path. Moving the toilet, tub, or sink gives you a better-functioning room but means relocating plumbing — worth it when the original layout wastes space. We map both options with a price for each.
Vanity & Storage
A single vanity, a double vanity for shared bathrooms, drawers versus doors, plus a medicine cabinet or recessed niche. Storage is what keeps a busy bathroom from feeling cluttered.
Niches & Benches
A built-in tiled niche keeps shampoo off the tub ledge; a shower bench adds comfort and accessibility. Small built-ins that make daily use easier — designed in from the start, not added on.
Ventilation
A properly sized exhaust fan is essential in a main bathroom — it pulls out the moisture that causes mould and protects your new finishes. It's a small detail that quietly protects the whole room.
The Look
Design & Finishes
With the function sorted, the finishes set the style. In a main bathroom, lean toward choices that are both beautiful and durable enough for daily family use.
Tile
Floor tile, wall tile, and shower tile each play a role. Larger-format tile means fewer grout lines and a cleaner look; a feature tile in the shower or on one wall adds character without overwhelming the room.
Fixtures & Finishes
Faucets, the showerhead, towel bars, and hardware in a consistent finish — chrome, brushed nickel, matte black, or brass — tie the room together. Name-brand fixtures last longer and keep replacement parts available for years.
Lighting
Bright, even light at the mirror for grooming, plus overall room lighting. A dimmer lets the same room go from a bright morning routine to a relaxing evening bath.
Comfort Upgrades
Heated floors take the chill off tile on a cold morning; a frameless glass shower enclosure opens up the room. Optional, but they turn an everyday bathroom into one you look forward to using.
What to Expect
Cost & Timeline
What It Costs
A main bathroom sits in the mid-range of a bathroom budget — more than a powder room because of the waterproofed wet zone, less than a large custom ensuite. What moves the number: keeping versus moving the layout, the tile and fixtures you choose, and tub-and-shower versus a single fixture.
How Long It Takes
A focused refresh runs about 1 to 2 weeks; a full gut and rebuild with custom tile and waterproofing runs longer. Before any work begins you get a written schedule with a committed end date, backed by our $300/day on-time guarantee.
Every Cornerstone bathroom comes with a detailed proposal and a fixed price in writing before any work begins. No ballpark numbers, no surprise invoices.
Common Questions
Main Bathroom FAQ
What's the difference between a 3-piece and a 4-piece bathroom?
Should I keep the tub or switch to a walk-in shower?
How long does a main bathroom renovation take?
What does a main bathroom renovation cost?
Can I use my bathroom during the renovation?
Do you pull permits?
Planning a Main Bathroom Renovation?
Start with a free bathroom diagnostic. We'll walk your space, talk through tub versus shower and the layout that fits your home, and deliver a detailed proposal with a fixed price before any work begins.
