ISS UK sustainability score: 35/100
ISS Facility Services Limited is a UK facilities and support services contractor providing cleaning, catering, and maintenance to corporate, healthcare and public-sector clients. Revenue £713.3M (2025); ~10,400 employees.
More about ISS UK
Part of the multinational ISS A/S group, headquartered Copenhagen.
Founded 1966Head office United KingdomStaff ~10,378 (2025)Revenue £713.3M revenue (FY ended 31 Dec 2025)Website ↗
ISS UK's emissions figures are a revenue-based share of a UK group total, and its direct emissions rose 26% in the latest year. Its Scope 3 covers business travel only, so supply-chain emissions are largely uncounted, and it publishes no water figures. It buys renewable electricity backed by REGO certificates and targets a fully electric or hydrogen commercial fleet by 2030.
ISS UK scores 35/100 (Below expectations) on SINK's independent climate assessment, scored from public data only. Scores are free. Companies can never pay for anything about their own score. Last verified November 2026.
That places ISS UK joint 548th of 947 companies scored, and 3rd of 3 in Facilities & Support Services.
What is ISS UK doing well, and where does it fall short?
Strongest on Controversies & Red Flags and Carbon Footprint: Operations (8/10, 6/10). Weakest on Water Impact and Emissions Trajectory (3/10, 4/10).
Where ISS UK lost points
For each question that lost points, the evidence our public rubric looks for that we didn't find.
- Emissions from its own operations6/10Its own emissions aren't independently verified or tracked over several years.
- Emissions from its supply chain5/10Most of its supply-chain (Scope 3) emissions aren't measured.
- Whether its emissions are falling4/10No evidence of a year-on-year fall in its total emissions.
- How clean its energy is4/10Less than half its energy shown to be renewable, or no transition plan.
- Its effect on nature4/10Its effect on nature isn't measured or independently verified.
- How it uses materials and handles waste5/10No measurable waste or recycling targets reported publicly.
- Its effect on water3/10No monitoring of water use, or no measures to reduce it.
- Its climate targets6/10Its targets aren't validated by the Science Based Targets initiative.
- How openly it reports6/10No 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 ISS UK's SINK score calculated?
Same ten questions for every company. No private weighting.
SINK = (0.3 × Base + 0.7 × Performance) × ScaleWhat evidence is ISS UK's score based on?
12 sources used in this assessment. All publicly available. Each row shows which of the ten questions it informed.
42% of them were published by ISS UK itself; the rest come from independent sources.
ISS UK's published emissions are a share of a UK group total allocated by revenue, not its own measured figures, and its Scope 3 covers business travel only. We apply the cautious 0.70x size deduction we use when a company's emissions are incomplete (owner ruling 2026-11-05).
7 of 12 sources are independent of the company.
“Electricity - market-based 175.14 137.31 27.55 62.15”
“Scope 1 & 2 property emissions reduced by 75%”
“ISS UK & Ireland has announced its new net-zero strategy”
“The partnership will initially be launched in Denmark, Germany, Norway and the UK in 2022”
“Recipes and meals that boast a 38% lower carbon emission rate than the average school dish”
“a collective 30% food waste reduction from its 2019 baseline”
“ISS is committed to reducing environmental impact across operations and value chains”
“This target directs ISS operations across the world to reduce carbon with 46.5% across Scopes 1 and 2 by 2030”
“was investigated by the Health & Safety Executive, which on Tuesday prosecuted Mr Marshall's employer, ISS Facility Services”
“Our Sustainability Report 2026 update shows how we turn commitments into measurable outcomes”
“ISS works with a diverse network of suppliers and partners who share our commitment to quality, sustainability and responsible business practices.”
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How does ISS UK compare with other facilities & support services companies?
ISS UK sits at the bottom of the facilities & support services pack.
Among the 3 major facilities & support services brands we've scored, ISS UK sits 3rd of 3.
Who scores higher in Facilities & Support Services?
The 2 companies in the sector scoring nearest above ISS UK.
Mitie has cut operational emissions over two years but weakened its climate targets after the Marlowe acquisition, switching from absolute to intensity-based goals and cutting Scope 3 reduction from 80% to 50%.
See the breakdown →Bidvest Noonan reports comprehensive Scope 1, 2 and 3 emissions with external ISO 14064-3 verification, but UK absolute emissions rose 47% from FY2023 to FY2025.
See the breakdown →Which companies moved this week, and why.
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