Bathroom Renovations Oshawa & Durham Region
Turnkey Service — From Demo to Final Clean
From demo to final clean, Cornerstone delivers full turnkey bathroom renovations with white glove service across Oshawa, Whitby, Bowmanville, Ajax, Pickering, and Durham Region. One team. One contract. Everything handled.
Back to Residential ServicesFour Types of Bathroom
Choose Your Bathroom Type
Every bathroom project starts with one question — which room are you building? Each type has a different size, a different price range, and a different set of design choices. Click through to learn exactly what goes into yours.
2-Piece · Half Bath
Powder Room
The smallest bathroom — toilet and sink, no shower. The highest design impact per dollar in the house. We break down sink styles, faucets, lighting, wall treatments, and cost.
Learn More3-Piece · Family Bath
Main Bathroom
The everyday family bathroom with a tub or shower. We explain tub versus shower versus both, why waterproofing matters most, layout and storage, finishes, and cost.
Learn MorePrimary Suite · Spa
Ensuite
The private primary-bedroom retreat. Freestanding tubs, walk-in showers, double vanities, heated floors and frameless glass — the spa features and the higher-end choices, explained.
Learn MoreBarrier-Free · Aging-in-Place
Accessible
A safe, barrier-free bathroom that doesn't look like a hospital. Curbless showers, grab bars, comfort-height toilets and universal design — built so you can stay in your home.
Learn MoreOur Service Standard
White Glove Service at Every Budget Level
Most contractors hand you a single-page quote and disappear until demo day. At Cornerstone we deliver a detailed multi-page proposal — scope of work, materials, timeline, and fixed price — before a single tool comes in. And that standard applies to every bathroom we build regardless of budget.
Detailed Multi-Page Proposal
Before any work begins you receive a full written proposal with a complete scope of work, material specifications, project timeline, and a fixed price. No ballpark numbers. No surprises. Most contractors hand you a single-page quote and disappear until demo day. We deliver a document you can hold us to.
Fixture and Tile Selection Guidance
We walk you through real tile samples, fixture options, and hardware finishes before a number is discussed. No pressure. No upsell. Just informed choices that fit your style and your budget. You know exactly what you are getting before you sign anything.
Full Trade Coordination
Plumber, electrician, and tile setter — all vetted and managed by us. One point of contact for the entire build. No subcontractor chaos. No chasing trades. No wondering why nobody showed up on Tuesday. We own the process from demo to handover.
Daily Site Updates
You always know what happened today and what is next. Your client portal is updated every evening with progress photos, financial details, and next steps. You stay fully informed while remaining entirely hands-off. You never have to ask.
White Glove Handover
When the job is done we do not just hand you the keys. We walk the entire project with you, complete a full punch list, and deliver your Owner's Manual with all specs, warranties, and maintenance instructions. You know exactly what was built and how to maintain it.
"Whether your bathroom is $12,000 or $80,000 — you get the same standard of service."
From the Founder
"I built Cornerstone because I grew tired of seeing homeowners in Durham get burned by the lowest bid lottery. In our industry, cheap prices always mean cut corners — whether it is skipping the waterproofing behind your shower walls or leaving drywall dust to choke your family's furnace.
We engineered the Cornerstone Standard to eliminate that chaos. When I walk into a neighbour's home, I treat it like a sanctuary. We price our projects honestly, execute them surgically, and back our work with a 5-year workmanship warranty because I intend to look my clients in the eye at the local grocery store for decades to come."
Mike Brock
Founder, Cornerstone Construction
Oshawa, Ontario — Serving Durham Region since 2017
Engineered to Outlast
Built Like a Waterproof Fortress
A beautiful bathroom is only as good as the engineering behind the walls. Water is the most destructive element in a residential home. We publish our exact material specifications because we want you to see the standard that goes into the spaces you cannot see.
Architectural Waterproofing & Sub-Structure
We eliminate the risk of mould, rot, and structural movement before a single tile is set.
In all wet zones and custom showers we completely eliminate traditional drywall or cement board. We install Schluter-KERDI-BOARD — stable, waterproof, and vapour-impermeable. Water physically cannot penetrate your wall cavities.
For non-wet areas we use premium moisture-resistant drywall to protect walls from high humidity and ambient steam.
Every tile floor we lay sits on a DITRA uncoupling membrane. This chemically decouples the tile from your subfloor so your home can shift and settle naturally — without ever cracking your tiles or popping your grout lines.
We use specialised engineered thin-set mortar designed to form an inseparable chemical bond with our Schluter waterproofing systems.
The 24-Hour Hydrostatic Flood Test
We prove our work is watertight before we lay a single tile.
Once the pre-pitched shower basin and waterproofing liner are fully installed, we mechanically cap the drain line.
We fill the shower basin to the absolute brim with water.
We let the water sit for a full 24 hours. If the waterline moves even a fraction of a millimetre, work stops until we find the cause. A leaking shower base can cause thousands of dollars in hidden structural rot. We do not risk your home on guesswork.
Premium Mechanics & High-Performance Finishes
We specify materials that perform as beautifully in year ten as they do on day one.
We refuse to use cheap porous grouts that stain, crack, and harbour mould. We specify Mapei Ultracolor Plus FA — a rapid-setting, colour-consistent, polymer-modified grout with DropEffect technology to repel water and dirty liquids.
We install only name-brand faucets and shower valves — Moen, Delta, Kohler, and Riobel. This ensures finish longevity, precise pressure balancing, and guarantees replacement cartridges are available decades down the road.
Where your layout calls for it, we design and install custom frameless glass enclosures using heavy 3/8" to 1/2" tempered safety glass with premium architectural hardware.
Every Bathroom Includes
This is the Cornerstone standard — not a premium upgrade.
In all wet zones — vapour-impermeable waterproofing board.
Uncoupling membrane on all tile floors.
On every shower — no exceptions.
Polymer-modified grout with DropEffect technology throughout.
Moen, Delta, Kohler, or Riobel on every project.
Pulled and managed by Cornerstone.
Full documentation at handover.
Recent Projects
Cornerstone Bathrooms in Durham Region
Every project below was built to the Cornerstone Standard — Schluter waterproofing, 24-hour flood test, dedicated site manager, and a 5-year written warranty.
Project 1 — Bowmanville
Project 2 — Courtice
Project 3 — Durham Region
Every Cornerstone bathroom is documented from demo to handover with CompanyCam. Your project gets the same treatment — hundreds of photos archived and accessible through your client portal.
The Cornerstone Process
How We Build Your Bathroom
Three phases. One team. One contract. Everything handled from the first site visit to the final white-glove clean.
Planning
We Listen
Before we touch a single tile we sit down with you. We learn how you use your bathroom, what matters most, and what your budget can do. Then we build a detailed multi-page proposal — scope, materials, timeline, and fixed price — around that. You know exactly what you are getting before you commit to anything.
Execution
We Build
Every trade on your bathroom is vetted, scheduled, and supervised by us. Schluter waterproofing systems go in first. The 24-hour flood test runs before any tile. HEPA air scrubbers run continuously. Daily cleanup happens every single day. One point of contact for the entire build — start to finish.
Completion
We Deliver
Your price is locked. Your timeline is committed — with a $300 per day penalty if we miss it. We do a full punch list walkthrough with you before we call it done. Then you receive a 5-year written workmanship warranty and a full Owner's Manual with all specs, warranties, and maintenance instructions.
The Cornerstone Standard
Your Home Is Protected From Day One
Most contractors treat your home like a job site. We treat it like someone lives there — because someone does. Before demo starts our full site protection protocol goes in. It stays until the last day.
Floor Armour
- Guardia Pro on all hardwood, tile, and stone surfaces
- HEPA vacuumed before protection goes down
- Self-adhesive, breathable, and waterproof
- Floors continue to cure underneath
- Nothing touches a finished surface without a barrier
Sealed Dust Containment
- Floor-to-ceiling polyethylene barriers at all transitions
- Heavy-duty zipper doors for crew access
- Tuck tape sealed at every seam
- Smoke detector dust covers on every sensor
- Your living space stays clean while we work
HVAC Protection
- MERV 5 filter pads on every supply and return vent
- Installed before demo starts — not after
- Keeps silica, gypsum, and drywall dust out of your ductwork
- Drywall dust contains silica — a known carcinogen
- Your ductwork stays clean from day one
Utility Safing-Off
- Water lines capped with SharkBite Max brass fittings
- Electrical circuits locked out using LOTO procedures
- Every line tagged and labelled before demo starts
- Water restored to the rest of the home same day
- Every line secured before demo begins
The 30-Minute Daily Reset
- Last 30 minutes of every workday dedicated to site organisation
- All garbage removed to the bin
- Tools, cords, and materials packed up
- Work zone HEPA vacuumed
- Floor protection and barriers inspected and re-taped
- Site washroom cleaned and sanitised twice a week
Negative Pressure Zone
- HEPA air scrubber running continuously on heavy demo days
- Negative pressure maintained throughout
- Air pulled out faster than it comes in
- Dust physically cannot travel to the rest of your home
- The same standard used in commercial construction
"This is not an add-on. It is standard on every Cornerstone project — $12,000 bathroom or $80,000 ensuite."
Optional Upgrades
Elevate Your Bathroom Into a Private Wellness Sanctuary
Every Cornerstone bathroom is built to an uncompromised structural standard. For clients who want to take their project further, we engineer and install the following premium upgrades.
Heated Floors
$2,000 – $4,500+
Ultimate comfort meets advanced engineering. This system integrates specialised electric floor-warming cables directly into a Schluter-DITRA uncoupling membrane for lasting performance. Powered by a dedicated 15/20A circuit and controlled by a smart touchscreen thermostat, it delivers uniform, energy-efficient radiant heat exactly where your feet touch the tile. No cold floors. Ever.
Smart Toilet Systems
$1,800 – $14,500+
Experience the ultimate in bathroom comfort and hygiene. These advanced systems feature motion-activated lids, heated seats, customizable nightlights, and self-cleaning UV nozzles. Powered by a dedicated, hidden 120V GFCI outlet behind the bowl, it delivers a sleek, fully touchless, and modern experience.
Architectural Floating Vanities
$4,500 – $14,000+
Built to last and designed to impress. Enjoy a clean, minimalist aesthetic featuring integrated LED under-cabinet motion lighting for a high-end resort feel. The wall-mounted design allows for easy floor cleaning while making your bathroom feel larger and more open. Includes heavy-duty, in-wall solid wood blocking for maximum stability and seamless plumbing concealment.
High-Capacity Multi-Jet Showers
$3,500 – $9,500+
Bring the ultimate spa shower experience home. Advanced multi-outlet plumbing loops seamlessly support dual showerheads, ceiling-mounted rain heads, and flush-mount body jets all at once. Heavy-duty 3/4" pressure-balanced loops ensure consistent, maximum water volume across all fixtures simultaneously, with built-in anti-scald protection. No drop in pressure when someone turns on a tap.
Residential Steam Showers & Aromatherapy
$12,000 – $25,000+
Transform your custom shower into a fully enclosed, airtight steam room. Precision steam generators powered by a dedicated 240V line feature integrated aromatherapy wells, allowing you to infuse therapeutic essential oils directly into the vapour cloud. Complete with a commercial-grade vapour-tight membrane and a custom sloped ceiling to prevent dripping, it creates a flawless private wellness sanctuary right in your own home.
Large-Format & Slab Tile
$25 – $100+/sq ft
Achieve a flawless, continuous architectural finish on your walls and floors. Our specialised team expertly handles and sets large-format porcelain and stone tile using minimised grout lines to dramatically expand the feel of the room. To ensure a perfectly flush, luxury hotel look, we prep every surface to a strict flatness tolerance of under 1/8" per 10 feet, guaranteeing maximum commercial-grade durability with zero uneven edges.
The Honest Truth
We Are Not the Cheapest Contractor in Durham Region. We Choose Not to Be.
Cheap contractors cannot afford to use Schluter waterproofing systems, Mapei polymer-modified grouts, or perform mandatory 24-hour hydrostatic flood tests. They skip the waterproofing membrane. They use porous grout that stains and cracks within two years. They guess at the shower pan instead of proving it is watertight.
You find out about those shortcuts in year two or three — when the grout discolours, the shower leaks, or the tile starts to crack and pop. By then the contractor is gone and the repair bill is yours.
We price our projects to do them once, do them right, and stand behind them for five years. A Cornerstone bathroom uses the same waterproofing systems, grout technology, and flood test protocol regardless of budget. Whether your project is $12,000 or $80,000 — the structural standard does not change.
We are not the cheapest. We choose not to be. Because the most expensive bathroom renovation is the one you have to do twice.
What to Expect
Bathroom Renovation Investment Guide
Bathroom renovations in Durham Region range from $12,000 for a focused refresh to $80,000 and above for a full ensuite build. Your investment depends on four things — size of the space, fixture selections, tile scope, and whether we are moving plumbing or electrical.
Refresh
$12,000 – $25,000
New fixtures, vanity, toilet, tile surround, and lighting. Same layout. Big visual impact without moving plumbing or electrical.
- New vanity and sink
- New toilet
- Tile surround — tub or shower
- New lighting and exhaust fan
- New hardware and accessories
- Schluter-DITRA on all tile floors
- Mapei Ultracolor Plus FA grout
Renovation
$20,000 – $40,000
Full gut and rebuild. New layout, updated plumbing and electrical, custom tile throughout, and Schluter waterproofing systems.
- Full demolition and disposal
- Schluter-KERDI-BOARD in wet zones
- 24-hour hydrostatic flood test
- Custom tile — floor, walls, and shower surround
- New plumbing — toilet, sink, shower, and all fixtures
- New electrical — pot lights, exhaust fan, and GFCI outlets
- Permits pulled and managed by Cornerstone
Ensuite Build
$25,000 – $80,000+
High-end materials, large-format tile, heated floors, frameless glass enclosure, and full architectural detailing.
- Everything in Renovation
- Large-format or slab tile
- Heated floors — Schluter-DITRA integrated
- Custom frameless glass — 3/8" to 1/2" tempered
- Premium tier-one fixtures — Moen, Delta, Kohler, or Riobel
- Custom millwork and floating vanity
- Optional steam shower or multi-jet system
"All pricing includes labour, materials, permits, and project management. No surprise invoices. Ever."
Common Questions
Bathroom Renovation Questions
Everything you need to know before starting your bathroom renovation in Durham Region.
How long does a bathroom renovation take?
Do you pull permits for bathroom renovations?
What waterproofing system do you use in showers?
Can I supply my own fixtures?
What is included in your bathroom renovation proposal?
Do you renovate bathrooms across Durham Region?
Serving Durham Region
Bathroom Renovations by Town
We build bathrooms across Durham Region. Choose your town for what we know about the local homes — or call us and we'll walk your space and give you a fixed price.
Ready to Build Your Bathroom
Book Your Free Project Diagnostic
We will walk your space, assess the scope, and deliver a detailed multi-page proposal — not a single-page quote — with a fixed price before any work begins.
Schluter waterproofing. 24-hour flood test. Dedicated site manager on your job every single day. Five-year written warranty. That is what a Cornerstone bathroom looks like — at every budget level.
Serving Oshawa · Whitby · Bowmanville · Ajax · Pickering · Newcastle · Clarington · Scarborough · Stouffville · Peterborough
