Basement (legal apartment) Renovation!

A legal basement apartment (secondary dwelling unit) is one of the smartest investments a Toronto homeowner can make. It adds significant property value and generates consistent rental income, but only if it's built to code. We specialize in the complete construction of fully compliant legal basement units.

Renovation Services Provided!

Legal secondary suite construction, complete design through rent-ready handover
Construction drawings to OBC standards
Building permit application and management, City and ESA
Plumbing permit management
Below-grade and separate entrance construction
Egress window installation, concrete cut-out and window well
Fire separation installation, Type X drywall assembly, fire-rated doors
Basement underpinning for ceiling height compliance
Full kitchen installation, cabinetry, countertop, sink, range hood, appliances
Full bathroom installation, tile, shower/tub, vanity, toilet, exhaust ventilation
Framing to OBC standards, perimeter and partition walls
Insulation and vapour barrier installation
Electrical rough-in and ESA permitted installation
Plumbing rough-in, below-grade drain work and supply
Backwater valve installation
Interconnected smoke and CO alarm installation
Drywall, taping, mudding, and Level 4 finish
Flooring throughout, LVP, tile, or client selection
Lighting installation, pot lights and fixtures
Doors, baseboards, casing, and trim
Interior painting, complete suite
Inspection scheduling and coordination, all stages
Permit close-out documentation at project completion

Rental Income Opportunity!

GTA rental demand for basement apartments remains among the strongest in Canada. Here's the current income context for a well-finished legal basement suite:

Location → 1-bedroom apartment → 2-bedroom apartment

Toronto (central and midtown) → $1,900–$2,400/month → $2,200–$2,800/month
Mississauga, Brampton, Vaughan → $1,700–$2,200/month → $2,000–$2,500/month
Oshawa, Whitby, Ajax, Pickering → $1,500–$1,900/month → $1,800–$2,200/month
Hamilton, Kitchener, Barrie → $1,400–$1,800/month → $1,700–$2,100/month

At a conservative $2,000 per month, a legal basement apartment generates $24,000 in gross annual rental income. Most GTA homeowners fully recover the cost of a legal basement renovation within 4 to 6 years, after which the income is profit that works directly against the mortgage or toward other financial priorities.

💡 A properly built legal basement apartment adds an estimated $80,000 to $150,000+ in property value in the GTA market, depending on location and quality of finish. The rental income alone often covers the full renovation cost within the first 4–5 years.

Renovation Cost!

Legal basement apartment costs vary based on the size of the basement, the baseline condition (ceiling height, existing plumbing, moisture history), the scope of structural work required, the separate entrance design, and the tier of finishes selected. The following ranges reflect current GTA market pricing:

Legal basement suite, standard conditions: (adequate ceiling height, manageable separate entrance, 700–900 sq ft): $90,000–$130,000+
Legal basement suite, complex conditions: (low ceiling requiring underpinning, difficult entrance location, or significant waterproofing): $130,000–$200,000+
Below-grade entrance only: (separate entrance construction as standalone project): $10,000–$20,000+
Underpinning (if required for ceiling height): (cost in addition to suite construction): $25,000–$60,000+

These ranges are starting reference points. Every legal basement suite project is priced specifically after a detailed site assessment.

Contact us for a comprehensive written estimate tailored to your property.

Rental Income Payback!

Why Choose Us!

All permits — City, ESA, and plumbing — are managed in-house, with OBC-compliant construction drawings included on every project. All inspections are scheduled and coordinated in-house. Fire separation is built correctly using the required Type X drywall assembly. Below-grade entrance design and construction is handled in-house, and licensed trades handle all electrical and plumbing work. All completed work is backed by a 1–2 year workmanship warranty, the suite is rent-ready at handover, and we are fully insured (GCL) and WSIB compliant throughout.

How long does it take to build a legal basement apartment in the GTA?

From first consultation to a rent-ready, fully permitted suite, plan for 5 to 7 months on a standard project. The permit approval process in most GTA municipalities takes 4 to 8 weeks. Construction, depending on scope, runs 10 to 16 weeks. Projects requiring underpinning for ceiling height compliance add 4 to 8 additional weeks. We provide a detailed project timeline and communicate any adjustments throughout the process.

How much rental income can I expect from a GTA legal basement apartment?

Rental income for legal basement apartments in the GTA ranges from approximately $1,500 to $2,800 per month depending on location, unit size, and finish quality. Toronto and inner GTA municipalities command higher rents; Durham Region and Hamilton communities are somewhat lower but still generate strong returns. A well-finished 2-bedroom legal suite in Mississauga or Brampton typically rents for $2,000 to $2,400 per month in the current market.

Does my basement meet the ceiling height requirement?

The minimum clear ceiling height for a legal secondary suite in Ontario is 1.95 metres (approximately 6 feet 5 inches) measured to the finished ceiling surface. To check your basement: measure from the finished concrete floor to the underside of the floor joists above, then subtract for the drywall ceiling finish (approximately 5/8 inch) and any mechanical elements (beams, ducts) that reduce clear height. If your measurement is below approximately 2.0 metres before finishing, you likely need underpinning to meet the requirement.

What is underpinning and when is it required?

Underpinning is the process of lowering the basement floor by excavating below the existing foundation footings and pouring new, deeper foundations. It's required when the existing basement ceiling height is insufficient to meet the 1.95 metre legal suite requirement. The process is structural and requires engineering drawings and a building permit. It adds $25,000 to $60,000 or more to the project cost depending on the basement area and soil conditions, but it is the only code-compliant way to address an inadequate ceiling height.

Do I have to register my basement apartment with the City?

In most GTA municipalities, yes. After all permits are closed and final inspections are passed, the unit needs to be registered as a legal secondary suite with the appropriate municipal authority. The registration process varies by municipality, some require a zoning certificate, some require a final inspection from the property standards department, and some have a formal secondary suite registry. We walk clients through the registration process as part of our project close-out. Without proper registration, you cannot legally rent the unit.

Can I convert an existing basement apartment into a legal suite without tearing everything out?

Sometimes, but it depends on what's there. We assess existing finished basements against all legal suite requirements: ceiling height, egress windows, fire separation, separate entrance, electrical compliance, plumbing condition, and smoke/CO alarm systems. In some cases, targeted upgrades bring an existing finished basement into compliance without full demolition. In most cases, significant work, at minimum fire separation, egress windows, and a separate entrance, is required regardless of what's already finished. A site assessment is the only way to know what's needed for your specific basement.

Will a legal basement apartment affect my home insurance?

Yes, but in a positive direction when it's done correctly. You need to inform your home insurer that you have a registered secondary suite and update your policy accordingly. Most standard home insurance policies can be updated to include a secondary suite as a landlord component; some insurers require a separate landlord insurance policy for the rental portion. What voids coverage is an unregistered, unpermitted suite. A properly built, legally registered suite is fully insurable and protects both your property and your rental income investment.