CarbonBuzz Logo
Forgotten your password? We can send you a reminder

CarbonBuzz Methodology

CarbonBuzz is the first platform that compares designed energy use with actual energy use side by side. Project data entered by practices is sourced from existing M&E documentation, Part L reports and Post Occupancy Evaluations (POEs). Any data that could identify a project would remain private and cannot be attributed to individual projects or practices. Please see the site Terms and Conditions for further detail on ensuring user and project anonymity.


In this way, the site will build a contemporary and comprehensive database of forecast and actual building energy use for the UK. It will become an invaluable resource to participating practices allowing them to compare their projects against CIBSE benchmarks.
CarbonBuzz builds on established Display Energy Certification (DEC) methodology, which is based on the real energy use of buildings rather than a forecast asset rating (EPC). DECs are mandatory for many public buildings. Forward looking organisations are already considering the adoption of DECs on a voluntary basis.


CarbonBuzz is the first to apply the DEC methodology to both design and actual values. By inviting users to submit data for unregulated energy use, the platform allows for simple comparison of the design estimate and actual metered consumption within existing CIBSE benchmarks.


The platform is designed to enable participating practices to enter user inputs for electricity and fuel consumption in kWh/m2/yr and then converts them into a CO2 emission profile.
The conversion is based on specific or default carbon emission factors. Renewable energy generation can also be input and is subtracted from consumption figures to quantify the project's overall emissions.


CarbonBuzz makes use of CIBSE TM46, which provides the backbone of DEC certification and contains energy consumption benchmarks for 29 different building use categories. The benchmarks are expressed in kWh/m2/yr and are converted into kgCO2/m2/yr.

Each project report will display figures in kgCO2/m2/yr. CIBSE benchmark, CarbonBuzz forecast, CarbonBuzz Actual, Project Forecast and Project Actual figures are all displayed in an easy to read format. This allows for comparison against average emissions for contemporary designed and built equivalents in addition to the notional emissions for the CIBSE benchmark.


CarbonBuzz makes use of an interactive and user friendly template to help with the entry and management of carbon emission data for submitted projects.