“Find a co-founder” has been close to gospel in startup advice for the better part of two decades — the assumption that a single founder is a red flag investors should treat with suspicion, a proxy for insufficient ability to build a team or convince anyone else to join the mission. That assumption is being tested by a visible and growing cohort of solo founders building genuinely substantial companies alone, and the reasons go beyond individual preference.
Why the co-founder orthodoxy took hold in the first place
The traditional case for co-founders was reasonably sound: building a company solo means one person carrying the full weight of product, technical execution, sales, and operations simultaneously, an unusually demanding load that a founding team can distribute. It also meant a single point of failure — investors have long worried about what happens to a company if its one founder burns out, leaves, or simply lacks a critical skill the business needs. These concerns weren’t wrong; they reflected genuine risks of solo founding in the environment startups previously operated in.
What’s actually changed: the workload itself has shrunk
The most concrete driver of the solo-founder shift is that AI tools have measurably reduced how much of that traditional multi-person workload a single capable founder can now handle alone. Coding assistants have made a single technically-minded founder dramatically more productive at building and iterating on a product than an equivalent solo founder could have been even a few years ago. AI-assisted content, customer support, and even elements of sales and marketing execution have similarly compressed functions that used to require dedicated additional people. None of this eliminates the genuine demands of running a company, but it has shifted the calculus: a solo founder today can credibly cover more ground than a solo founder in 2019 could, making the traditional “you need a team to cover all the bases” argument somewhat weaker than it used to be.
Investor attitudes are shifting too, if more slowly
Venture capital attitudes toward solo founders have softened, though less dramatically than the underlying capability shift might suggest — a legacy of pattern-matching investment approaches that take time to update. A meaningful number of investors now explicitly state they’re open to backing strong solo founders, particularly in categories like developer tools and AI-native products where a single technically excellent founder building fast is seen as a genuine asset rather than a liability. That said, the traditional scepticism hasn’t disappeared entirely, and solo founders report still needing to work somewhat harder than equivalent founding teams to convince more conservative investors that key-person risk is manageable.
The trade-offs solo founders themselves describe
Founders building alone are generally candid about what the model doesn’t solve: the emotional and decision-making isolation of having no co-founder to test ideas against or share the pressure with remains a genuine cost, one that AI tools don’t meaningfully address regardless of how much execution workload they remove. Many solo founders compensate through advisers, informal peer networks of other founders, or bringing on a strong early employee who functions somewhat like a co-founder without the formal equity split — a middle path between fully solo and a traditional co-founding team that’s becoming increasingly common.
What this means for how startups get built, not just funded
The broader significance of this shift goes beyond fundraising dynamics: it suggests the minimum viable team size for building a genuinely competitive company has fallen, with real implications for how many companies can plausibly be started by how many people, and how capital-efficient early-stage building can be when a single founder can credibly cover ground that used to require three or four people. Whether that continues as AI tools keep advancing, or whether it plateaus as the remaining human-judgement-heavy parts of company-building resist automation, is a genuinely open question.
How solo founders are building support networks instead of co-founders
Rather than eliminating the need for collaboration entirely, successful solo founders have generally developed alternative structures that provide some of what a co-founder traditionally offered, without the formal equity partnership. Structured peer groups of other solo or early-stage founders, meeting regularly specifically to provide the sounding-board function a co-founder would normally serve, have become a notably common pattern. Some solo founders also deliberately build a small, trusted advisory board earlier than a comparable founding team might, specifically to distribute some of the strategic decision-making weight that would otherwise rest entirely on one person. These aren’t perfect substitutes for a genuine co-founding partnership, but they represent a genuine, increasingly structured response to the isolation problem solo founders consistently describe as the model’s hardest unsolved issue.
What this means for how startup accelerators and investors organise themselves
This shift has prompted some adaptation from the institutions that support early-stage founders. A number of startup accelerators and incubator programmes have adjusted their own structures to better support solo founders specifically, including deliberately facilitating peer connections among solo founders in the same cohort, recognising that the traditional accelerator model was often implicitly designed around founding teams. Some venture capital firms have similarly developed more explicit frameworks for assessing solo-founder risk, moving beyond a blanket scepticism toward a more differentiated view that weighs a solo founder’s specific track record, support network, and the nature of the business itself, rather than treating solo founding as an automatic red flag regardless of context.
What this article is not
This is a description of an observable trend in how UK startups are being founded, not advice about whether any individual entrepreneur should build alone or seek a co-founder. That choice depends entirely on personal circumstances, working style, and the specific business being built.
Sources: General reporting and venture capital commentary on solo founder trends and AI-assisted startup building, 2025–2026.
