The CRREM Foundation is retiring its Excel-based calculation tool on 1 July 2026, but the underlying pathway data and methodology remain permanently open-access through the CRREM Library — meaning anyone can still calculate CRREM misalignment years using the published datasets and Technical Blueprint, either by building their own implementation or using a third-party tool.
This retirement has caused significant concern among practitioners who relied on the Excel tool as their primary interface for assessing transition risk in property portfolios. The key point to understand is that CRREM is withdrawing a frontend tool, not the methodology itself. The pathway datasets, emission factors, and calculation specifications are all published as open-access resources on the CRREM Library page, launched 30 April 2026.
What Is Changing vs. What Remains
The Excel tool — the downloadable spreadsheet that many fund managers, asset managers, and consultants used to input building data and receive a stranding year — is being removed from the CRREM website on 1 July 2026 and will no longer be maintained. CRREM has stated there is no commitment to develop replacement frontend tooling. The Foundation is refocusing on its core role: maintaining the scientific methodology and pathway data.
What remains permanently available is the CRREM Library, which includes the Global Pathways dataset (year-by-year energy and carbon budgets by region and property type, 2020–2050), the Emission Factors dataset (per carrier, per country, per year), the Technical Blueprint (the complete calculation specification for building CRREM-aligned tools), and reference implementations that allow developers to verify their calculations against canonical worked examples.
The practical implication: If you were using the Excel tool, you now have three options — build your own implementation from the Technical Blueprint, use a commercial platform that has integrated the CRREM methodology (over 40 Licence Partners exist), or use a free tool built on the open-access pathway data.
Option 1: Build Your Own
The Technical Blueprint provides everything needed to build a compliant CRREM calculation from scratch. The inputs are property type, country, gross internal area, reporting year, and energy consumption by carrier. The calculation produces energy intensity, carbon intensity, the pathway budget for each year, and the misalignment year — the year the building's trajectory crosses the 1.5°C pathway. For organisations with in-house data teams, this is a viable route, but it requires development resource and ongoing maintenance as pathways are updated.
Option 2: Use a Commercial Platform
More than 40 software platforms now deliver the CRREM methodology through integrated tools as CRREM Licence Partners. These include platforms like Measurabl, Deepki, and others that embed CRREM calculations within broader ESG data management systems. For organisations already using one of these platforms, the Excel tool retirement changes nothing — the calculation is already built into their existing workflow.
Option 3: Free Tools Built on Open-Access Data
The Plinthos CRREM Misalignment Engine is a free, browser-based tool that calculates the misalignment year for any UK commercial property. It takes the same core inputs — property type, energy intensity, carbon intensity — and produces the stranding year, the gap from the current pathway budget, and cumulative excess emissions. Built on the open-access CRREM pathway methodology, it requires no account, no download, and no installation.
For practitioners who need more than just the misalignment year — specifically, those who need to incorporate CRREM data into a RICS 4th Edition-compliant valuation report — Plinthos for Valuers generates a full ESG valuation insert that includes the stranded asset timeline alongside EPC/MEES classification, capex estimates, and a standardised KPI dashboard.
The retirement of the Excel tool is, in practice, a market expansion event for downstream tools. CRREM's decision to focus on methodology and delegate tooling to the ecosystem means more practitioners will need third-party solutions — whether commercial platforms, in-house builds, or free tools like the Plinthos Misalignment Engine.