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MONTRESSOR

Location: 15 Montressor Dr, Toronto, ON

Year of Construction: 2023– (Permit issued July 31, 2023; Revision Aug 18, 2023)

Building Overview:

A modern two-storey single-family residence with a full basement and integrated outdoor pool area,

located within a ravine-protected site in Toronto. The design balances structural innovation and

energy efficiency through a cold-formed steel framing system and a high-performance envelope.

Key Details:

  • Total Area: 596.3 m² (6,418 ft²)
  • Basement: 298.7 m²
  • Main Floor: 273.7 m²
  • Second Floor: 316.3 m²
  • Garage: 42.9 m²
  • Height: 8.60 m (CofA approved)
  • Lot Area: 964.1 m² | Coverage: 32.9% | FSI: 0.61
  • Zoning: RD / R3 | Storeys: 2 + basement

Structure & Materials:

Cold-formed steel framing (LEFF Inc.) on reinforced concrete foundation.

Stucco, stone, and composite cladding with aluminum glazing system.

Flat roof assembly with R-31 insulation; walls with R-22 batt + R-5 ci continuous.

Architect & Engineers:

  • Architectural Design: ADA Engineering Solutions Inc.
  • Lead Designer: Ehsan Ghomi
  • Structural Engineering: LEFF Inc. (Ali Kia Kojouri, Hadi Malekghasemi)
  • Surveyor: Barich Grenkie Surveying Ltd., O.L.S.

Notable Features:

  • Open-concept layout with double-height living area
  • Basement wellness level with spa, gym, sauna, and theatre
  • Pool terrace with retaining walls and landscaped softscape
  • Energy performance compliance with OBC SB-12 (Performance Path)
  • Designed under TRCA and Committee of Adjustment approvals

About the project

The 15 Montressor Drive Residence represents a refined collaboration between ADA Engineering’s architectural vision and LEFF Inc.

’s technological innovation. It illustrates how modern Toronto homes are adopting lightweight steel framing for. precision and environmental performance while maintaining luxury and comfort. With its open plan, integrated wellness spaces, and connection to landscape, the project balances structural clarity and human experience. Every element from the carefully orchestrated spatial volumes to its efficient thermal envelope demonstrates a commitment to longevity, sustainability, and contemporary craft.

Ultimately, 15 Montressor Drive embodies Toronto’s emerging identity in custom residential design:

precise, innovative, and rooted in context.

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