Understanding certifications

Sustainability certifications are everywhere in hospitality right now — and that's a good thing. But for anyone trying to make genuinely informed decisions about where to stay, meet, or direct spend, the landscape can feel more confusing than clarifying. Is a Green Key hotel more sustainable than an EarthCheck one? Does ISO certification mean the same thing as B Corp? And what does any of it actually mean for your organisation's ESG commitments?

At GSI, we believe that understanding the difference between certifications is just as important as recognising that they exist. Not all standards are built the same. Some prioritise rigorous third-party auditing; others are more self-assessed. Some focus almost entirely on environmental performance; others give equal weight to social impact, governance, and community. Knowing which is which helps you ask better questions, make smarter choices, and avoid the greenwashing trap.

To help cut through the noise, we've mapped seven of the most widely recognised sustainability certifications in hospitality — across two dimensions that matter most to procurement teams and sustainability leads: the balance between social and environmental criteria, and the intensity of the auditing process.

Conclusion

No single certification is the definitive answer — and that's not a flaw in the system, it's a reflection of the fact that sustainability itself is multidimensional. A corporate travel programme focused on Scope 3 emissions reporting will have different needs to an event planner trying to demonstrate community impact, or a procurement lead building a values-aligned hotel programme from scratch.

What the matrix makes clear is that the most meaningful question isn't "is this property certified?" but "certified to what standard, assessed by whom, and does that standard align with what we actually care about?"

At GSI, we help organisations navigate exactly these decisions — translating the complexity of sustainability frameworks into practical, actionable procurement strategy. If you'd like to talk through what the right certification criteria look like for your travel or events programme, we'd love to start that conversation.