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Additions and Extensions - Beginner's Checklist

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Your First Steps For A Smooth Project

Beginner's Checklist - Start Strong!

Dodge the delays, cost overruns, and headaches.

Zoning

Confirm your property's zoning status first, as this determines if a secondary suite (basement apartment, ADU) is permitted. Use the City of London's interactive mapping tool online to ensure zoning allows for Additional Residential Units (ARUs).

Parking

London no longer mandates an additional parking space for secondary suites. While not required, consider practical tenant needs and neighborhood goodwill by ensuring sufficient on-site parking options.

Unit Size & Floor Area

Secondary units should be smaller than the main home but no strict percentage limit applies. Keep the unit reasonably sized for comfortable living, ensuring compliance with practical limitations such as bedroom count and general market appeal.

Lot Size & Property Layout

While no strict minimum lot size for a single internal secondary suite is required, verify your lot layout to accommodate essentials like entrances and emergency egress. Ensure sufficient clearance (ideally 4 feet) from property lines for window installation and safe entry.

Ceiling Height

The Ontario Building Code requires finished ceiling heights of at least 6 ft 5 in (1.95m) in older homes and 6 ft 11 in (2.1m) in newer homes. Plan renovations carefully, ensuring headroom compliance throughout, especially at entrances and under ductwork.

Separate Entrance

Provide a safe, private entrance—preferably an existing side or rear entrance or a newly created dedicated entryway. Avoid altering the home's front façade significantly, maintaining neighborhood aesthetics and compliance.

Windows & Egress

Each bedroom or unit without a direct exterior door must have a large enough egress window (minimum 15” x 20” opening, typically casement style). Windows must also meet natural light and ventilation standards, so anticipate enlarging existing basement windows or adding new ones with proper window wells.

Room Sizes & Layout

Ensure minimum living space requirements are met (e.g., living room 145 sq. ft., bedrooms minimum 75-105 sq. ft.). Thoughtfully plan your layout to ensure comfortable and functional spaces, increasing both tenant satisfaction and property value.