CAHP says conserving existing buildings could cut carbon and ease housing pressures

By AI, Created 4:35 PM UTC, May 18, 2026, /AGP/ – Canada’s heritage professionals are urging policymakers to treat retrofit and adaptive reuse as core housing and climate tools, not niche exceptions. A new national CAHP report says reusing existing buildings can reduce emissions, costs and waste while preserving community character.

Why it matters: - Buildings and the built environment produce roughly one-third of global CO₂ emissions from construction and operations combined. - An estimated 75% of today’s building stock is expected to still be in use by 2050, making reuse, upgrade or demolition decisions central to climate outcomes. - Canada’s housing supply gap, rising construction costs, slow project delivery and aging building stock make faster reuse strategies more relevant. - Adaptive reuse can also preserve cultural value and community character while supporting local trades and economic activity.

What happened: - The Canadian Association of Heritage Professionals released a national report on May 12 examining how Canada can better use existing buildings to advance climate and housing goals. - The report studies retrofit and adaptive reuse in Halifax, Montréal and Vancouver. - The case studies include a mid-century modern office building, a former textile factory and a historic residence. - The full report, English and French versions, fact sheets and supporting materials are available in the online media kit.

The details: - The report compared three scenarios across the case studies: retrofit, retrofit with an addition, and demolition and replacement. - The analysis used a conservation-led approach to renovations. - The work included life cycle assessment and cost modeling aligned with the National Building Code and the National Energy Code for Buildings. - Across the three case studies, conservation-led retrofit scenarios performed strongly on carbon and cost over time when guided by qualified professionals. - As regional energy grids decarbonize, materials, construction and demolition make up a growing share of total building impact. - The report says reuse over replacement can reduce emissions, limit construction waste and manage long-term costs. - Retrofit and adaptive reuse projects were often faster to deliver and less disruptive than new construction. - Those projects also support local trades and economic activity.

Between the lines: - The report argues that climate policy has focused too much on operational emissions from building use and not enough on embodied emissions from materials, manufacturing, demolition and replacement. - That shift matters more as cleaner electricity makes building materials and construction a larger part of the emissions profile. - The findings suggest existing-building strategies could solve two problems at once: carbon reduction and housing delivery. - The report also points to a policy mismatch, with codes, zoning and financing still tilted toward new construction.

What’s next: - CAHP says existing buildings and adaptive reuse should be treated as core parts of Canada’s climate and housing strategy. - The report calls for building codes that better recognize existing conditions and fairly evaluate retrofit and reuse. - It also calls for life cycle carbon assessment in codes and funding approvals. - The report urges removing structural barriers in codes, zoning and financing that disadvantage adaptive reuse.

The bottom line: - CAHP’s message is blunt: conserving and upgrading what Canada already has may be one of the fastest, lowest-waste ways to cut emissions and add housing value at the same time.