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Getting professional assistance for building permit additions in Toronto Before planning for second-floor additions in Toronto, you first need to understand the second-floor addition. Second-floor addition, if properly designed, can provide a homeowner with the extra space they desire without changing the home's footprint. Since professionals built the second-floor addition on top of the existing first floor, no new foundation is needed. The existing first-floor exterior walls and foundation will serve as the supporting structure for the new second floor. The existing first-floor interior walls will also support the new second-floor framing.