Permitted, inspected, registered basement apartments that pass the first time.
- Feasibility & design
- 1 — 2 weeks
- Permit review
- 4 — 12 weeks
- Construction
- 8 — 14 weeks
- Inspections & registration
- 2 — 4 weeks
Legal Basement in Caledon — the short answer
A legal basement apartment — formally an Additional Residential Unit or second suite — is a self-contained dwelling in a basement that has been built to the Ontario Building Code, approved under a building permit, inspected, and where required registered with the municipality. Under Bill 23 (More Homes Built Faster Act), most detached, semi-detached and townhouse properties in Ontario may add one ARU as-of-right. In Caledon, that work is permitted and inspected through Town of Caledon Building Services. Caledon reviews septic capacity when you add bedrooms or bathrooms, and much of the Town falls within the Niagara Escarpment Plan, the Oak Ridges Moraine or Credit Valley Conservation jurisdiction. Those reviews add time, so we start the approvals conversation early rather than at submission.
Whether a Caledon basement can become a legal suite is decided by the house, not by the brochure. A mix of century farmhouses, 1980s and 90s custom country homes on one to ten acre lots, and newer subdivision growth in Bolton and Caledon East. Many properties run on private wells and septic systems, which constrains where you can add plumbing fixtures and where a deck footing can land.
Rural lots mean long material carries and no municipal water for cleanup. We plan site logistics into the schedule so a two-week deck does not become a four-week one.
Permits — Town of Caledon Building Services
Caledon reviews septic capacity when you add bedrooms or bathrooms, and much of the Town falls within the Niagara Escarpment Plan, the Oak Ridges Moraine or Credit Valley Conservation jurisdiction. Those reviews add time, so we start the approvals conversation early rather than at submission.
Legal Basement pricing
- Legalise an existing finished basement$25,000 — $62,000
- Unfinished basement — standard unit$85,000 — $140,000
- Two-bedroom suite with walk-up$140,000 — $220,000
- Complex build$220,000 — $300,000+
- Per square foot — legal suite$90 — $150 / sq ft
Underpinning to gain ceiling height is the single largest cost variable and can add $80,000 or more. We measure your existing height at the lowest duct before quoting so that number is never a surprise.
Neighbourhoods
Bolton · Caledon East · Inglewood · Palgrave · Alton · Cheltenham · Terra Cotta · Mono Mills
These apply to every legal basement project in Caledon. Town of Caledon Building Services is the final authority and we confirm each item against your specific property before quoting.
Code feasibility assessment
Before you spend a dollar we measure ceiling height, window openings, joist depth, panel capacity and lot conditions against the Ontario Building Code and your zoning bylaw, and tell you honestly whether the basement qualifies.
Permit drawings & submission
Floor plans, fire separation details, egress and ventilation schedules prepared and submitted to your municipality, with responses to plan-review comments handled by us.
Separate entrance construction
Side or rear entrances, excavated walk-ups, retaining walls, drainage and a compliant landing and stair. Toronto in particular restricts new front-façade entrances that make a house read as a duplex.
Egress windows & window wells
Cutting and enlarging foundation openings, structural lintels, window wells with proper drainage, and a clear opening that meets the code minimum for escape.
Fire separation & alarms
Rated ceiling and wall assemblies between units, self-closing doors, firestopping at every penetration, and interconnected smoke and carbon monoxide alarms across both dwellings.
Full unit build & registration
Kitchen, bathroom, bedrooms, separate laundry, sound insulation, dedicated HVAC and ventilation, ESA inspection, final building inspection and municipal two-unit registration.
Not seeing your question? Call or text (647) 928-3544 — we answer same day, usually within 2 hours.
Town of Caledon Building Services handles permits for Caledon. Caledon reviews septic capacity when you add bedrooms or bathrooms, and much of the Town falls within the Niagara Escarpment Plan, the Oak Ridges Moraine or Credit Valley Conservation jurisdiction. Those reviews add time, so we start the approvals conversation early rather than at submission. We prepare the drawings, submit the application, respond to plan-review comments and call every inspection through to a closed permit, so you are not standing in a queue at City Hall.
We come to you in Caledon, measure on site, and hand back a written line-by-line quote at no cost. Same day, usually within 2 hours response.
Same day, usually within 2 hours· Serving the GTA, Hamilton, Guelph & Kitchener