Serving Whitby & Brooklin

Bathroom Renovations
Whitby

From the older homes in the downtown and Brooklin cores to the newer subdivisions north and west, Cornerstone builds waterproof, built-to-last bathrooms in Whitby — fixed price, daily cleanup, and a 5-year written warranty.

Start Your Bathroom Diagnostic Call 1-888-404-7383

Local Knowledge

Bathroom Renovations Built for Whitby Homes

Whitby spans a wide range of homes. The established neighbourhoods around downtown Whitby and historic Brooklin have character homes with smaller original bathrooms and, often, older plumbing that needs attention when the walls come open. These spaces reward a thoughtful redesign — making a tight footprint feel modern and open without losing the home's character.

Across the newer subdivisions north and west of the 401, the homes are structurally sound but the bathrooms are builder-grade — basic tile, entry-level fixtures, and finishes chosen to hit a price point. These are perfect upgrade candidates, and because the bones are solid the work goes straight into what you see and use.

Either way, the engineering underneath is what protects your home — and that never changes with budget. Every Whitby bathroom we build gets the same Schluter waterproofing system and a mandatory 24-hour flood test before a single tile goes in.

A lot of Whitby projects roll the bathroom in with other work. If you're renovating more than one room, it's the right time to fold in a kitchen renovation in Whitby while the trades are on site — and if you're finishing the lower level, a legal basement apartment in Whitby needs its own fully waterproofed bathroom built to this exact standard.

Recent Work

Bathrooms We've Built Around Durham

Bathroom renovation Durham Region Cornerstone Construction Custom tiled shower Durham Region bathroom renovation Finished Durham Region bathroom renovation Cornerstone

A recent Cornerstone bathroom built here in Durham Region — Schluter waterproofing, 24-hour flood test, and a 5-year written warranty. The same standard goes into every Whitby project.

The Cornerstone Standard

The Same Build Quality at Every Budget

Whether your Whitby bathroom is a focused refresh or a full ensuite, the structural standard never changes. Here's what goes into every one.

Waterproof Fortress

Schluter-KERDI-BOARD in all wet zones and Schluter-DITRA under every tile floor — water physically cannot reach your wall cavities or crack your tile.

24-Hour Flood Test

Every shower basin is flooded to the brim and held for 24 hours before any tile goes in. If the water drops a millimetre, work stops.

Fixed Price & On-Time

A detailed multi-page proposal with a locked price and a committed schedule — backed by a $300/day penalty if we miss the end date.

Dust & Site Protection

Sealed dust containment, HEPA air scrubbers, floor armour, and a 30-minute cleanup every single day. Your home stays livable.

Common Questions

Whitby Bathroom Renovation FAQ

I have an older home in downtown Whitby or Brooklin — can you handle the old plumbing?
Yes — it's common in Whitby's established neighbourhoods. Older homes often have galvanized or cast-iron supply and drain lines that are corroding or undersized. We assess what's behind the walls during planning and build any plumbing replacement into the scope and fixed price up front, so there's no surprise when we open the wall.
How long does a bathroom renovation take?
Most bathroom renovations run 2 to 4 weeks depending on scope — a focused refresh is 1 to 2 weeks, a full ensuite gut with custom tile and Schluter waterproofing runs 3 to 5 weeks. Before any work begins you get a written schedule with a committed start and end date, backed by a $300 per day penalty if we miss it.
What does a bathroom renovation cost in Whitby?
A focused refresh runs $12,000–$25,000, a full renovation $20,000–$40,000, and a high-end ensuite build $25,000–$80,000+. Your investment depends on the size of the space, your fixtures, the tile scope, and whether we're moving plumbing or electrical. You get a fixed price in writing before any work starts.
Do you pull permits?
Yes. Any work involving plumbing, electrical, or structural changes requires a permit in Ontario, and we pull and manage all permits with the Town of Whitby so the work is inspected and done to code. Contractors who skip permits create a liability that sits on your property title and can void your home insurance.
Can you make a small Whitby bathroom feel bigger?
Often, yes. In older Whitby homes especially, smart moves like a larger-format tile, a frameless glass shower, a floating vanity, better lighting, and the right layout can make a tight bathroom feel dramatically more open — without moving exterior walls. For bigger openings between rooms, that's structural work — see open-concept wall removal in Whitby. We map out the options in the proposal so you can see the plan before we start.
The Full Bathroom Build Standard
See exactly how we engineer every bathroom — waterproofing, process, and investment guide
See How We Build

Ready to Renovate Your Whitby Bathroom?

Start with a free bathroom diagnostic. We'll walk your space, assess the scope, and deliver a detailed multi-page proposal with a fixed price before any work begins — built once, built right.

Start Your Bathroom Diagnostic Call 1-888-404-7383

Durham Region's trusted renovation contractor. Led by Mike Brock since 2017. We Listen, We Build, We Deliver.

Service Areas

  • Oshawa, ON
  • Whitby, ON
  • Bowmanville, ON
  • Clarington, ON
  • Ajax, ON
  • Pickering, ON
  • Newcastle, ON
  • Scarborough, ON
  • Whitchurch-Stouffville, ON
  • Port Perry, ON
  • Peterborough, ON
  • Port Hope, ON
  • Cobourg, ON
  • Northumberland County, ON
© 2026 Cornerstone Construction. All rights reserved. Licensed & Insured Ontario Corporation Serving Durham Region Since 2017
Privacy Policy Terms of Service Code of Ethics Editorial Standards AI Disclosure