LEED (Leadership in Energy and Environmental Design) is a green building rating system that awards points for measures in areas such as energy, water, materials and indoor environmental quality. A project that meets the prerequisites and earns enough points is certified at one of four levels. In Canada, LEED is administered by the Canada Green Building Council (CAGBC) together with the organizations that run LEED internationally.
How LEED is structured
LEED has several rating systems for different project types. The main families include:
- Building Design and Construction for new buildings and major renovations.
- Interior Design and Construction for tenant fit-outs.
- Operations and Maintenance for existing buildings, based on actual performance.
- Rating systems for homes and for neighbourhood development.
Each rating system has prerequisites, which every project must meet, and credits, which earn points. LEED is updated periodically, and versions differ in their requirements, so check which version your project is registered under and its current rules.
Main credit categories
| Category | What it covers |
|---|---|
| Integrative process | Early collaboration between disciplines to find efficient solutions |
| Location and transportation | Site location, access to transit, cycling and reduced parking |
| Sustainable sites | Site disturbance, stormwater, heat island and light pollution |
| Water efficiency | Indoor and outdoor water use, metering |
| Energy and atmosphere | Energy performance, commissioning, refrigerants, metering, renewable energy |
| Materials and resources | Waste, life-cycle impacts and material sourcing |
| Indoor environmental quality | Ventilation, air quality, thermal comfort, lighting, daylight and acoustics |
Additional points are available for innovation and for regional priorities. Energy and atmosphere typically carries a large share of the available points, which is why mechanical and electrical systems are central to most LEED projects.
Certification levels
LEED has four levels: Certified, Silver, Gold and Platinum, each corresponding to a range of points. The point thresholds are set by the rating system version, so confirm them for your project.
What LEED means for building systems
Commissioning
Commissioning of energy-related systems is a prerequisite in the new construction rating systems, with additional credit available for enhanced commissioning. See our guide to commissioning a new building.
Energy performance
Projects demonstrate energy performance against a baseline, usually through energy modelling. HVAC design, controls, envelope and lighting all affect the result.
Ventilation and air quality
Prerequisites typically require ventilation to meet a recognized standard such as ASHRAE 62.1. Credits are available for enhanced ventilation, monitoring and better filtration. Our guides to ventilation and indoor air quality and HVAC filters and MERV ratings cover the background.
Metering and refrigerants
Projects are expected to meter energy use, and credits reward refrigerant choices with lower environmental impact.
The certification process
- Decide early whether to pursue certification and at what level.
- Register the project and set up a credit plan with the design team.
- Assign responsibility for each credit and its documentation.
- Track documentation through design and construction.
- Submit for review, respond to comments and receive a certification decision.
A LEED accredited professional on the team usually manages the process. Fees for registration and certification apply and are set by the certifying body.
Certification is not the finish line. A certified building can still perform poorly if it is not operated as designed. Plan how systems will be maintained, metered and checked after occupancy, and consider the Operations and Maintenance rating system to track actual performance over time.
LEED and other programs
LEED is not the only option in Canada. Other programs focus on specific outcomes such as zero carbon or energy performance, and some municipalities have their own green building requirements. Choose the program that matches your goals, tenants' expectations and any funding conditions.
Costs and benefits
Pursuing LEED adds costs for documentation, consulting, commissioning, energy modelling and certification fees, and some credits require design or equipment choices that cost more up front. Owners weigh these against benefits such as lower operating costs, tenant and investor expectations, and access to programs or financing that recognize certification. The balance depends on the project, so it is worth estimating early rather than assuming.
Practical tips for owners
- Set goals before design so LEED supports them rather than driving the design.
- Budget for commissioning, energy modelling and documentation time.
- Involve your future operators so the building is maintainable.
- Keep records after certification; they help with recertification and audits.
How ehZee can help
Our mechanical system inspections help owners of new and existing buildings check that HVAC, ventilation and controls are operating as intended, which supports energy and indoor environmental quality goals whether or not a building is pursuing certification.
Common questions
Can an existing building be LEED certified?
Yes. The Operations and Maintenance rating system certifies existing buildings based on their actual performance and operating practices.
Does LEED certification guarantee lower energy bills?
No. It shows the building was designed and documented to meet certain criteria. Actual energy use depends on how the building is operated and maintained.