.png&w=180&h=160&fit=inside&output=webp "Ground Level Construction, Renovations, Repairs & Consulting Cornwall ON")
Basement Apartment Cornwall
Turn your property into a high-yield investment. We specialize in legal basement apartments, in-law suites, and Additional Residential Units (ARUs).
Maximize Rental Income with an Additional Residential Unit (ARU)
With recent changes to Ontario's building laws and federal mortgage insurance updates, there has never been a better time to build a secondary suite. In Cornwall and the SD&G region, homeowners can now add up to three units per lot with development charges waived in many cases.
Ground Level Construction handles the entire duplex conversion process. From initial architectural drawings and permit management to fire separation and final municipal inspection, we ensure your basement apartment is 100% legal and code-compliant.
Added Property Value
A legal secondary suite significantly increases your property's resale value and appraisal, often paying for itself in equity alone.
Rental Cash Flow
Offset your mortgage or build a retirement fund with consistent monthly rental income from a modern, high-demand living space.
Our Secondary Suite Services
- Legal basement apartment conversions
- Single-family to duplex conversions
- In-law suite and garden suite builds
- OBC fire separation and soundproofing
- Egress window and separate entrance installation
- Full kitchen and bathroom additions
- Permit management with SDG townships
- Utility separation and HVAC upgrades
Basement Apartment FAQ
How many units can I add to my house in Ontario?
Under current provincial legislation, most residential lots in Ontario are permitted to have up to three additional residential units (ARUs) as of right, provided they meet building code and safety standards.
What makes a basement apartment 'legal' in Cornwall?
A legal apartment must have proper fire separation, soundproofing, minimum ceiling heights, egress windows for every bedroom, and valid permits and inspections from the City of Cornwall or your township.
Does GLC handle the building permits?
Yes. We manage the entire process from architectural drawings to filing applications and coordinating all municipal inspections until the unit is fully signed off.
Turn Your Basement Into an Asset
Ground Level Construction provides free estimates for legal basement apartments across Cornwall and the SDG region.
