UK Domestic Building Energy Benchmarks

267 UK domestic building energy benchmarks held in the GreenCalculus MasterBrain, drawn from 15 named sources, each listed with its publisher and licence under Sources below. Values are read live from the data layer on every page build, so nothing here is re-typed and nothing can drift from the figures the calculators use. They span 23 units of measurement — 164 of them in million Btu per household using the fuel for space heating (site energy, 2020) — which is why the spread below is reported per unit and never blended. The count includes 205 heating-system parameters — SAP 10.2 boiler efficiencies, heat-pump seasonal performance and equipment lifetimes — a family too small to warrant a page of its own and published nowhere else.

Where these factors are used

Residential Mortgage Financed Emissions sets out how factors in this group are applied, and PCAF Mortgages Calculator and Heat Pump vs Gas Boiler Calculator draw on them directly.

What this group contains

Figures are computed per unit and never blended: a median across different units would be arithmetically valid and physically meaningless. 12 further units in this group have fewer than 3 factors and are counted above but not described.

What has changed

Sources, citation & machine access

Cite the upstream publisher for the values themselves. The reference below credits this compilation and, more usefully, pins the edition you read.

GreenCalculus. (2026). UK Domestic Building Energy Benchmarks (MasterBrain v2026.284). Numbers Publishing Pte. Ltd. https://greencalculus.com/factors/domestic-building-energy-benchmarks/

Cite this factor group

Values change between editions. Quoting the MasterBrain version is what lets a reader resolve the exact number you used. See the change record above for factors in this group that have moved.

For a reference manager, in BibTeX then RIS:

@misc{greencalculus_building_energy_2026,
  author       = {{GreenCalculus}},
  title        = {UK Domestic Building Energy Benchmarks},
  year         = {2026},
  howpublished = {GreenCalculus},
  publisher    = {Numbers Publishing Pte. Ltd.},
  note         = {MasterBrain v2026.284},
  url          = {https://greencalculus.com/factors/domestic-building-energy-benchmarks/}
}

TY  - DATA
AU  - GreenCalculus
TI  - UK Domestic Building Energy Benchmarks
PY  - 2026
DB  - GreenCalculus
PB  - Numbers Publishing Pte. Ltd.
ET  - MasterBrain v2026.284
UR  - https://greencalculus.com/factors/domestic-building-energy-benchmarks/
ER  - 

The factors on this page come from 2 sections of the open API, one address each. No key, no signup:

https://greencalculus.com/wp-json/greencalculus/v1/factors/building_energy

https://greencalculus.com/wp-json/greencalculus/v1/factors/heating_systems

curl -s "https://greencalculus.com/wp-json/greencalculus/v1/factors/building_energy?limit=500"

import requests
base = "https://greencalculus.com/wp-json/greencalculus/v1/factors/"
rows = []
for section in ["building_energy", "heating_systems"]:
    rows += requests.get(base + section, params={"limit": 500}).json()["factors"]
print(len(rows), "rows across", 2, "sections")

The endpoint returns 58 more rows than this table: rows this page deliberately leaves out.

Or as a spreadsheet: 266 of the 267 rows on this page, each with its source, the edition it last changed in, and its own link:

https://greencalculus.com/wp-json/greencalculus/v1/factors-export?page=domestic-building-energy-benchmarks

Download this table as CSV

The download leaves out 1 row from GSHPA_OFGEM_INSITU_2024, whose terms do not give us the right to pass their figures on in a file. They stay on this page, each beside its source, and in the endpoint above, where every row carries licence.redistributable. The per-publisher terms are on the sources register.

Both responses carry an X-GC-Version header, so a consumer can detect a new edition without diffing the payload. The CSV filename carries the edition too, so two downloads months apart do not collide.

All factors

Last changed names the data-layer edition in which a factor last took a new value, reconstructed from every released edition since v2025.13. A dash means the value has not moved since tracking began, which is the answer to "is the figure I used last year still current?".

Common questions