Licensed & Insured · Serving the GTA
Basement Renovation in the GTA
Finished basements, family rooms, and legal secondary suites, designed and built by one team and priced in a written, itemized fixed-price quote.
- Rec rooms, home theatres, gyms, and play spaces
- Legal basement apartments and in-law suites
- Moisture control, insulation and soundproofing done before drywall
- One project manager, reachable in English or Mandarin
★ 5.0 rated on Google, HomeStars, Houzz and Yelp · 14+ years renovating GTA homes · Free itemized quotes
Basement Renovation Contractor for GTA Homes
Most GTA basements start out as the room nobody plans for. In a 1980s backsplit in Scarborough, it's usually a low ceiling, a furnace in the middle of the floor, and paneling that hides a damp patch. In a newer Markham or Vaughan subdivision, the basement might be a clean concrete box with good height and a rough-in for a bathroom that was never finished. Both can become the most used part of the house, but they need very different plans.
Y2 Design & Build has been finishing basements across the GTA for more than 14 years. Our basement renovation projects are designed, priced, and built by the same team, so the layout you approve is the layout that gets built. We write and itemize every quote, and our trades are licensed and WSIB-covered.
Moisture, Insulation and What Goes Behind the Walls
A basement renovation that looks perfect on handover day can fail within two winters if the walls weren't dealt with properly. Before we frame anything, we look for signs including white mineral deposits on the concrete, a musty smell near the cold room, water staining under windows, or a sump pit that runs more than it should.
For dry foundations, we insulate in a way that keeps warm indoor air away from cold concrete—typically rigid foam board against the foundation wall, then a framed wall with additional insulation.
- Backwater valve and sump pump: If your home doesn't have them, it's worth discussing. The City of Toronto and some other GTA municipalities offer subsidies toward flood protection devices.
- Ceiling height and ductwork: We map where bulkheads will fall before the design is final, so you know exactly how the ceiling will look.
- Electrical panel capacity: A suite with its own kitchen, or a basement with heated floors and a theatre, can push an older 100-amp panel too far.
- Windows: Small, high basement windows often need to be enlarged for light and, in any bedroom, for safe exit.
Start With What the Basement Is For
The single biggest decision is how the space will be used, because it changes the permits, the cost, and the construction details.
| What you want | What changes in the build |
|---|---|
| Family room, playroom or home office | Insulation, flooring, lighting and finishes. A permit is usually needed once walls, plumbing or new electrical go in. |
| Home theatre or gym | Extra sound insulation, dedicated circuits, ceiling height checks for equipment, and rubber or vinyl flooring that handles weight. |
| Guest suite or in-law space | A bathroom, often a kitchenette, better egress windows and careful heating so the space is comfortable year-round. |
| Legal basement apartment | A separate entrance, fire separation, interconnected smoke and CO alarms, egress, independent heating considerations and full Building Code compliance. |
Get Started in 3 Simple Steps
From first call to final walkthrough — here's exactly how it works.
Book Your Free Consultation
Call or request a quote online. We visit your home, take measurements, and listen to what you want — no pressure, no charge.
Approve Your Fixed-Price Quote
You get a written, itemized quote covering scope, materials, and labour. The price you approve is the price you pay.
We Build. You Move In.
One dedicated project manager runs your renovation on a locked schedule — permits, trades, and cleanup all handled for you.
Basement Renovation Services We Provide
Basement Finishing
Turn unfinished space into comfortable living areas with flooring, walls, ceilings, lighting and storage.
Legal Basement Apartments
Build secondary suites around local zoning, Building Code, egress, fire separation and servicing requirements.
Basement Bathrooms
Add a new bathroom or finish an existing rough-in, including plumbing, waterproofing, fixtures and tile.
Basement Kitchens & Wet Bars
Create functional kitchens, kitchenettes or entertaining areas with appropriate plumbing, electrical and cabinetry.
Home Theatres
Plan sound control, lighting, electrical and media-wall requirements for dedicated entertainment spaces.
Basement Gyms
Use durable flooring, adequate lighting, ventilation and layouts suited to exercise equipment.
Basement Bedrooms
Plan privacy, heating, storage and required emergency egress for comfortable sleeping spaces.
Home Offices & Playrooms
Create dedicated areas with practical lighting, storage, flooring and sound considerations.
Walkout Basement Renovation
Make use of existing exterior access or plan interior layouts around a walkout entrance, with appropriate insulation, flooring, lighting and finishing.
Legal Basement Apartments in Ontario
Ontario now allows up to three residential units on most urban lots, which has made basement suites a serious option for families and investors. A legal suite has to meet the Ontario Building Code and your municipality's rules, and the details matter.
In broad terms, a legal basement apartment needs:
- Adequate ceiling height over the required living area (for existing houses, typically 1.95 m, dropping to 1.85 m under beams and ducts)
- A bedroom window or door that allows a safe exit, with a minimum unobstructed opening set by the Code
- Fire separation between units, usually with fire-rated drywall and proper doors
- Interconnected smoke alarms and carbon monoxide alarms
- A separate entrance and safe path of travel to the outside
- Permits, inspections, and, in many municipalities, registration of the second unit
Rules differ between Toronto, Markham, Richmond Hill, Vaughan, and other GTA cities, so we confirm the local requirements for your address during design. Read our guide on what makes a basement apartment legal in Ontario to learn more about each requirement. If a relative will be moving in, a suite may also qualify for the federal Multigenerational Home Renovation Tax Credit. See our article on Ontario renovation tax credits and rebates.
Basement Renovation Cost in the GTA
A typical basement renovation with Y2 runs about $50 to $120 per square foot, depending on layout, moisture work, and finish level.
600 sq ft
$30,000 – $72,000
Approximate Range
800 sq ft
$40,000 – $96,000
Approximate Range
1,000 sq ft
$50,000 – $120,000
Approximate Range
These figures are a planning guide, not a quote. A basic open family room with laminate flooring sits at the lower end. A legal suite with a kitchen, a full bathroom, a new entrance, and fire separation sits toward the top. What tends to move the number most:
- Adding a bathroom, especially if the plumbing rough-in isn't where you want the room
- A kitchen or wet bar, with cabinetry, counters, and venting
- Cutting a new side entrance or enlarging windows
- Waterproofing, drainage repairs or replacing old insulation
- Electrical panel upgrades
- Premium finishes like engineered hardwood, custom millwork and built-in media walls
Our detailed GTA basement renovation cost guide breaks these down further. Whatever you choose, the itemized quote shows each line, so you can see exactly where the money goes and decide what to keep.
Basement Renovation Services By City
Explore dedicated basement renovation resources for the municipalities we serve most across the GTA.
Rated 5 Stars by GTA Homeowners
Real reviews from real renovation clients across the Greater Toronto Area.
“From the start, my wife and I felt completely at ease working with John and Andy. We couldn't be happier with our new bathrooms — finished exactly on schedule and within budget. The entire experience exceeded our expectations.”
Marc
Markham
“It was so wonderful working with Y2. John was my primary contact and he was AMAZING and so professional. We redid our primary bathroom and flooring — everything was so organized and timely.”
Shararah S.
Markham
“We wanted to update our bathroom with a budget in mind. Y2 listened, started work the next day, and finished in 4 days. We are very pleased and would recommend them.”
Karthi
Pickering
“Jeff from Y2 Design was very helpful throughout the process. The work was done efficiently and effectively. Will highly recommend.”
Smriti
Markham
“They did our flooring for us. Floors look great, and we're really happy!”
Lizzie
Ajax
“Our kitchen was completely outdated and Y2 turned it into something we're actually excited to cook in. The team walked us through every material choice and stuck to the timeline they gave us.”
David T.
Oakville
How Long Does a Basement Renovation Take?
The calendar has two parts. Design and permits come first, and their length depends on the scope and on your municipality's review time. Construction follows. Many finished basements need several weeks of on-site work once permits are in hand. One recent client's basement was completed in five weeks. Legal suites take longer because of inspections at each stage.
Typical Construction Order
Demolition and moisture repairs → Framing and insulation → Plumbing and electrical rough-in → Inspections → Drywall → Flooring, trim, paint, fixtures → Final walkthrough.
Not sure whether your project needs a permit? Read do you need a permit to finish your basement.
How We Work With You
The first visit is free and carries no obligation
We measure the space, look at the foundation walls, the panel, and the mechanical room, and ask how your family actually spends its evenings. Do the kids need a place to be loud? Does a parent need a quiet bedroom with its own bathroom? Those answers drive the layout.
You get a design and a written, itemized quote
It lists the scope, materials, and labor, so there are no vague allowances to argue about later. If something hidden turns up once the old finishes come down, we document it with photos and a written cost before any extra work goes ahead.
Your project manager runs the job
They schedule the trades, book inspections and keep you updated. We protect the stairs and the route through your home, and keep dust contained so the rest of the house stays livable. Our article on what to expect during a home renovation covers the day-to-day in more detail.
Basement Renovation FAQs
Common questions about basement renovation projects in the GTA.
In most GTA municipalities, yes, once you add walls, a bathroom, plumbing, new electrical circuits, a new entrance, or a second unit. Electrical work also requires an ESA permit. Purely cosmetic updates like painting or replacing flooring generally don't.
Often, yes, if you meet zoning, ceiling height, egress, and fire separation requirements. We review your basement against these requirements before you commit to a design.
We find the source first. Active leaks are repaired before any finishing, and the wall assembly is designed to keep moisture out of the new space.
Usually. It may involve cutting the concrete floor to connect to the drain, or installing an upflush system where that isn't practical. We'll explain the options and costs at the quote stage.
Yes. Call (647) 294-2888 to speak with our team in Mandarin throughout the project.
Yes. Y2 Design & Build is a licensed and insured contractor, and our trades are WSIB-covered.
More Ways We Can Help
Many clients combine a basement renovation with other work. We also handle:
Before work begins, it's also worth reading whether your home insurance covers a renovation.
Book Your Free Basement Renovation Consultation
Tell us what you'd like the space to become. We'll visit, measure and give you an itemized fixed-price quote, with no obligation attached.
Or email us at info@y2canada.com
Get Your Free Renovation Quote
Tell us about your project — or call (647) 507-3639 to talk now.