Carbon13
Carbon13 is a Cambridge-based climate tech venture builder that has invested in over 100 startups since 2021. Its Venture Builder (Cambridge, plus Berlin for EU residents) takes cohorts of about 80 people who have no team or idea yet through teaming, validation and acceleration phases over about eight months. Its Venture Accelerator backs existing UK- or EU-registered climate startups with pre-seed investment. Both target ventures that can cut large amounts of CO2e.
At a glance
Carbon13 key facts
- Investment
- $174K
- Equity
- 4%
- Deal terms
- Venture Accelerator: €150,000 to €250,000 (about $174K to $290K) pre-seed on a SAFE targeting a 4 to 7% stake, plus 1% in options taken during Phase 1. Venture Builder Cambridge: £120,000 investment for teams selected by the investment committee after Phase 2 (equity not published). Investments run through Carbon13's SEIS funds (Fund X launched June 2026).
- Duration
- Venture Builder: about 8 months; Venture Accelerator: 8-week remote sprint plus 12-month growth phase
- Format
- Hybrid
- Headquarters
- Cambridge, United Kingdom
- Cohort locations
- Cambridge, United Kingdom; Berlin, Germany
- Stage
- idea, pre-seed
- Sectors
- climate, deep tech
- Application cycle
- Venture Builder: annual cohorts per city; Venture Accelerator: rolling assessment with a yearly deadline
Verified November 4, 2026 against the sources below. Terms change; confirm on the official site before applying.
Timing
The Venture Accelerator's final deadline was September 30, with the cohort starting the week of November 16 (year not printed; consistent with 2026), so it is closed. Job listings crawled in July 2026 said Cambridge Cohort 10 and Berlin Cohort 6 were open; no current Venture Builder deadline is published.
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Notable alumni
- Materials Nexus
- Kita
- Infyos
- Nium
- Climate-i
FAQ
Applying to Carbon13
- How much does Carbon13 invest?
- Carbon13's standard deal: Venture Accelerator: €150,000 to €250,000 (about $174K to $290K) pre-seed on a SAFE targeting a 4 to 7% stake, plus 1% in options taken during Phase 1. Venture Builder Cambridge: £120,000 investment for teams selected by the investment committee after Phase 2 (equity not published). Investments run through Carbon13's SEIS funds (Fund X launched June 2026).
- How much equity does Carbon13 take?
- Carbon13 takes 4% equity.
- When is the Carbon13 application deadline?
- Application cycle: Venture Builder: annual cohorts per city; Venture Accelerator: rolling assessment with a yearly deadline. The Venture Accelerator's final deadline was September 30, with the cohort starting the week of November 16 (year not printed; consistent with 2026), so it is closed. Job listings crawled in July 2026 said Cambridge Cohort 10 and Berlin Cohort 6 were open; no current Venture Builder deadline is published.
- Where is Carbon13 based?
- Carbon13 is headquartered in Cambridge, United Kingdom. The program runs hybrid. Cohorts run in Cambridge, United Kingdom, Berlin, Germany.
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