Last year, 100 million room nights went to certified hotels — see how close yours is.

A 20-minute check against the Green Key criteria shows you exactly where your hotel stands, and which gaps to close first.

See how it works

The demand for certified hotels

Travellers are choosing certified hotels in numbers that matter.

Annual room nights · 2025

100m+

Room nights booked at hotels displaying a third-party sustainability certification on Booking.com last year, the single largest demand signal in the report.

Certified properties

28,000

Accommodation partners now hold a recognised third-party sustainability certification on the platform.

+22% YoY

Traveller intent

68%

Of travellers say they want to travel more sustainably in the coming year.

For hotels without certification, that is a growing share of demand filtering past you. For hotels with it, an expanding source of bookings. Green Key is one of the most widely recognised third-party certifications in hospitality, and the path to certified is shorter than most hotels realise.

Source · Booking Holdings 2025 Sustainability Report · Booking.com 2025 Travel & Sustainability Report

The readiness check

7 topic areas, about 20 minutes.

A structured diagnostic against the full Green Key imperative criteria set. You walk away with a category-by-category gap analysis and a specific next step for every criterion you have not yet met.

Step 01

Work through questions across 7 topics.

Sustainable management, guest involvement, water, energy and carbon, waste, procurement, and living environment. Have a recent utility bill and your supplier list nearby, you will move faster.

Step 02

Get a category-by-category gap analysis.

For each of the 7 topic areas, see the imperative criteria you already meet, the criteria still missing, and a specific next step for every gap. Useful on its own, before any application is started.

Option A Save
for later

Option B Start the
application

Step 03

Decide what to do next, on your terms.

Nothing is submitted to Green Key from this check. Save your results to return to, share them internally, or move into a guided application through the BeCause Certification Co-pilot.

~20 minutes · No payment, no commitment · Just see where you stand

Why most hotels have not pursued it yet

The barrier is not the criteria. It is the paperwork.

Pain Invoices, meter readings, supplier records spread across email and shared drives.

Every file, reading, and supplier record consolidated in one place, mapped to the criterion it evidences. Solution

Pain Criteria interpreted differently every time you re-open the application.

An AI assistant that explains each criterion in plain language and shows you exactly what auditors expect. Solution

Pain Three months of stop-start project work the team cannot prioritise.

Notifications at every step, including when auditors return an application for follow-up, so nothing stalls in your inbox. Solution

It is the manual data wrangling, not the certification standards, that holds hotels back. That is exactly what the BeCause Certification Co-pilot is built to solve.

Trust & reassurance

Built for hotels, with hotels.

BeCause is the platform behind sustainability certification for hundreds of hotels and resorts across Europe. The Certification Co-pilot is built specifically for individual properties, guided, structured, and designed to use the data you already have.

In use

Used by hotels across 18 countries.

From independent boutiques to large resort groups, the platform powers certification workflows already in production.

Standard

Official partner of Green Key.

Built directly against the Green Key criteria set, with an evidence model designed for the application as it is actually reviewed.

Co-shared

Shared with you by Booking.com.

Surfaced through your partner relationship as a practical tool, not an ad.