Standards · 6 min read
These four systems solve different problems. The honest question is not "which is best" — it is which fits your building, your market, and your budget.
It is tempting to rank green-building standards as if they were competitors for the same title. They are not. Each was built for a different priority, and the right choice depends on what your project actually needs to prove.
| Standard | What it is | When it fits |
|---|---|---|
| LEED | The world's most widely used rating system, developed by USGBC and independently certified by GBCI. A 110-point scale with four levels — Certified 40, Silver 50, Gold 60, Platinum 80+ — across families for new construction, interiors, existing buildings, and more. | When you want a globally recognised, third-party-verified label with broad market currency and a system to match almost any building type. |
| BREEAM | The long-established European benchmark, assessed by licensed assessors against a defined methodology. Widely recognised across the UK and Europe. | When your project sits in a European market where BREEAM is the established expectation and local recognition matters. |
| WELL | A standard focused on occupant health and wellbeing — air, water, light, comfort, and the human experience of a space — rather than environmental impact alone. | When the priority is the people inside the building, and you want to evidence a healthier indoor environment. |
| EDGE | An IFC (World Bank Group) standard built around one measurable rule: at least a 20% reduction in energy, water, and embodied energy versus a typical local building. Pass/fail, with three levels up to Zero Carbon. | When you want a fast, affordable, finance-friendly proof of efficiency — especially in emerging markets, where EDGE was designed to fit. |
Three questions usually settle it:
Because each standard answers a different question, projects sometimes pursue more than one — for example, an environmental rating alongside a health-focused one. The discipline of preparing for any of them is broadly the same: defined credits, defined evidence, defined methods. What changes is which priority you are evidencing, and to which audience.
There is no universally "best" standard — only the one that fits your building, your market, and your budget. The most useful thing you can do early is decide what the certification is for, because that single decision shapes the system, the cost, and the timeline of everything that follows.