Building for Tomorrow
Issue 8 | May 2026

By: Margi Pandya

Canada needs about 3.5 million additional homes by 2030 to restore affordability, but current construction pace falls short of that target. This slow pace is caused, in part, by inconsistent building codes across Canadian jurisdictions.  

Builders have to wrestle with different rules depending on where they’re building, which can slow down projects and increase costs. Building codes work in the background of every structure you enter. From making sure stairs have a handrail to hold to regulating the width of entry ramps for accessibility, these codes are an essential part of modern construction safety. But to get more homes built quickly, the rules need to be more co-ordinated across the country. 

What is a building code?

The building code is essentially a rulebook for construction. It sets the minimum standards that any building must meet to be considered safe, covering everything from the strength of the materials used and how a building handles fire to whether it’s accessible for people who are differently abled. Builders, architects and engineers are all required to follow these standards when designing and constructing any new building or making major changes to an existing one. 

In Canada, the baseline building codes document is the National Building Code (NBC) developed by the Canadian Board for Harmonized Construction Codes (CBHCC) and published by the National Research Council. It is developed by technical experts and updated every five years to reflect new research, materials and construction methods. Think of it as the federal template for a comprehensive, science-based standard that represents best practices in safe construction. 

Why don’t all Canadian jurisdictions have the same rules?  

Jurisdiction, climate and geography can complicate things. In Canada, the constitution gives provinces and territories jurisdiction over construction and land use. That means the NBC is not automatically binding anywhere in the country. Each province decides whether to adopt it in part or full, modify it or write its own version entirely.

Most provinces use NBC as their starting point and then layer on their own amendments. British Columbia, for example, has the BC Building Code. Alberta has the Alberta Building Code, and Ontario, Quebec and others have their own versions too. On top of that, many municipalities add their own local rules.

The result is a hodgepodge of standards that vary from one province, and sometimes one city, to the next.

Geography matters

Some of these differences exist for a reason. Canada is an enormous country with wildly different climates, and buildings need to be designed for the environment they exist in.

In Alberta, temperatures can plunge to -40°C in winter. Buildings need heavily insulated walls, heating systems designed to keep pipes from freezing and structures from contracting and cracking. In coastal and northern regions, buildings must account for extreme wind loads and heavy snow accumulation on rooftops.

Adapting building codes to reflect local conditions is both practical and appropriate. However, the rules can diverge on things that have nothing to do with climate or geography, creating unnecessary inconsistencies that slow down builders and raise costs without making anyone safer.

Why do inconsistencies create problems?

For most people, these inconsistencies in building codes are invisible. But for the construction industry, they create real challenges. 

For example, backwater valve requirements can vary widely between jurisdictions, even in areas with similar flood risk or sewer infrastructure. In those cases, the added differences don’t necessarily improve safety, but they do add cost and complexity for builders working across regions. 

A builder who works across multiple provinces must navigate a different rulebook in each one. A manufacturer who produces prefabricated wall panels or modular home units must ensure their product meets the code in every market they want to sell into, and these codes don’t always agree. What’s approved in Alberta might require modifications in Ontario. A design that’s certified in one province might need to be re-engineered, re-tested and re-approved somewhere else. That costs time and money, and it slows down construction at a moment when Canada desperately needs to build more homes faster.

This is especially significant for modern construction methods like modular and prefabricated housing, which are built in factories and shipped to sites across the country. These methods have massive potential to speed up home building projects, but inconsistent codes chip away at that advantage when every province requires a different standard. 

Why does harmonization matter?

Harmonization means aligning the rules so that they’re consistent, or at least compatible, across provinces. It doesn’t mean every province must surrender its authority or end up with identical codes, but it can reduce unnecessary differences that serve no safety purpose and create bureaucratic delays.

The benefits would be immediate. Manufacturers could build to one standard and sell nationally. Builders could move between provinces without having to learn a new set of codes. Innovative construction products could get approved once and deployed everywhere, rather than going through a separate approval process in each jurisdiction. The result would be a faster, more efficient construction sector capable of delivering more homes in less time.

The bottom line

Building codes are the product of decades of accumulated knowledge about what works, what fails and what keeps people safe. Canadians benefit from building codes every day without even realizing it.

However, the system’s fragmentation is causing unnecessary friction. In a country facing a housing crisis, the inconsistent, province-by-province approach to building codes is a hidden obstacle to getting more homes built. Harmonizing codes won’t solve the housing shortage on its own, but it is an important part of the puzzle. 

Each month, Building for Tomorrow explores new developments in trade-enabling infrastructure in Canada, such as the rationale behind national projects, negotiations and agreements between different Canadian jurisdictions and developments in approval processes and policy.

This issue of Building for Tomorrow was written by Margi Pandya. If you have any developments you’d like to see featured or topics that you think should be covered, please send them to Ryan Workman, at workman@cwf.ca.

Further reading