Nationwide Building Society sustainability score: 49/100
Better than 82% of Financial Services / Banking
Leading practice starts at 60. The highest score on SINK is 71.
Nationwide Building Society is the UK's largest mutual lender, headquartered in Swindon, operating over 600 branches and serving 16 million members. It offers mortgages, savings, insurance and banking services.
More about Nationwide Building Society
As a mutual, it is owned by its members rather than shareholders. It is not listed on stock exchanges.
Founded 1884Head office Swindon, United KingdomStaff ~17,680Revenue ~£4.1BWebsite ↗
Nationwide has decarbonised operations effectively (Scope 1 down 45%), secured 100% renewable electricity, and published robust TCFD disclosures with third-party assurance. Its critical weakness: financed emissions (mortgages) at 3.2M tCO2e dwarf direct impact, the 2030 reduction target is acknowledged as unachievable without government policy, and nature-related financial risks remain largely unquantified.
Nationwide Building Society scores 49/100 (Making progress) on SINK's independent climate assessment, scored from public data only. Scores are free. Nobody can pay to change a score, speed it up or hide it. Last verified May 2026.
That places Nationwide Building Society joint 179th of 1,023 companies scored, and joint 9th of 61 in Financial Services / Banking.
What is Nationwide Building Society doing well, and where does it fall short?
Strongest on Carbon Footprint: Operations and Energy Source (8/10, 8/10). Weakest on Water Impact and Nature & Biodiversity Impact (4/10, 5/10).
Where Nationwide Building Society lost points
For each question that lost points, the evidence our public rubric looks for that we didn't find.
What would raise this score
- Its effect on waterMeasure its water footprint and set reduction targets.
- Its effect on natureMeasure its effect on nature and have it independently verified.
- Its climate targetsMake its targets science-based, or commit to the Science Based Targets initiative.
Every question that lost points
- Emissions from its own operations8/10No verified figures published with their method and a falling trend.
- Emissions from its supply chain7/10No full value-chain map or supplier engagement programme.
- Whether its emissions are falling6/10No consistent fall over several years across its operations and supply chain.
- How clean its energy is8/10Its own operations aren't shown to run on 100% renewable energy.
- Its effect on nature5/10Its effect on nature isn't measured or independently verified.
- How it uses materials and handles waste6/10No verified figures for reuse and recycling across the business.
- Its effect on water4/10No measured water footprint with reduction targets.
- Its climate targets5/10Its targets aren't science-based or committed to the Science Based Targets initiative.
- How openly it reports7/10No annual impact report, or no pay linked to climate targets.
A score changes when the evidence does. We use new published evidence at the next rescore. Anyone can send us new evidence, free. How to send it.
How is Nationwide Building Society's SINK score calculated?
Same ten questions for every company. No private weighting.
SINK = (0.3 × Base + 0.7 × Performance) × ScaleWhat evidence is Nationwide Building Society's score based on?
13 sources used in this assessment. All publicly available. Each row shows which of the ten questions it informed.
62% of them were published by Nationwide Building Society itself; the rest come from independent sources.
Scored on 6 April 2026 under an earlier version of our method. We're re-checking it under the current method.
If you believe a source has been misread or a newer version exists, submit a challenge.
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How does Nationwide Building Society compare with other financial services / banking companies?
Where Nationwide Building Society sits among financial services / banking peers.
Among the 61 major financial services / banking brands we've scored, Nationwide Building Society is tied =9th of 61, with 3 others.
Who scores higher in Financial Services / Banking?
The 3 companies in the sector scoring nearest above Nationwide Building Society.
Mastercard met its SBTi-approved 2025 targets and publishes PwC-assured emissions data, but its Scope 1 and 2 emissions rose in 2025 and its total fell only 1%. 27% of its 100% renewable electricity comes from unbundled certificates, and its carbon-neutral operations claim relies partly on carbon credits.
See the breakdown →TRIG is a renewable-energy infrastructure investor with near-zero operational emissions but rising portfolio emissions (38% year-on-year) driven by construction.
See the breakdown →Visa operates a global payments duopoly enabling fossil-fuel commerce at scale without restriction, despite having SBTi-approved climate targets and 100% renewable electricity.
See the breakdown →Which companies moved this week, and why.
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