Entering a New Market? Five Expansion Mistakes That Can Burn Through Your Runway

Welcome to the exclusive monthly series where we share insights on how founders can make better decisions under imperfect information and different constraints.

This month’s challenge: entering new markets

For many Seed to Series A companies, entering a new market feels like the natural next step but while on paper everything can look compelling, without the right planning, a single misstep can quickly turn expansion into an expensive lesson.

Here are the most common issues we see: 

  1. ‘It worked here, it will work there’ 

Assuming the demand will translate is one of the mistakes we see all too often. The same playbook isn’t always guaranteed to work, different markets have different… 

  • Buying habits
  • Price expectations
  • Competitors
  • Regulations
  • Sales cycles

Solution

Test demand before scaling. Run small, measurable experiments to validate customer interest, pricing and sales dynamics before committing significant time and capital to the new market.

  1. Underestimating testing costs

Have you found yourself thinking ‘We’ll just hire one person and test’? In reality, expansion usually involves

  • Legal setup
  • Tax registrations
  • Local payroll
  • Compliance
  • New marketing spend
  • Travel
  • Foreign exchange considerations

That “quick test” can easily eat six figures before you know it.

Solution: 

Budget for the full cost of expansion. Create a detailed financial model that captures setup costs, ongoing expenses and cash runway before committing to a new market.

  1. Expanding before unit economics are proven

If customer acquisition costs and payback periods are not well understood in your core market, layering on the complexity of a new geography can amplify existing issues.

Solution: Prove your core business model first. Ensure CAC, margins and payback periods are well understood before entering a new market with untested margins.

  1. Relying on top-line assumptions

Founders often model revenue upside but give less attention to cash impact, working capital needs and how long it may take for the new market to become self-sustaining.

Solution: Focus on cash, not just revenue. Model the impact on runway, working capital and time to profitability.

  1. Falling into a Sunk Cost trap

Without clear milestones, companies can continue investing in a market long after the data suggests the opportunity is weaker than anticipated. But the fallacy persists – we’ve spent money here, we will figure out how to make it work – even if it won’t.

Solution: Set clear milestones upfront. Define what success looks like and when to scale, adjust or stop.

Bonus Tip: Questions worth answering before expanding

  • What is the total upfront investment required?
  • How much additional runway will this consume?
  • What assumptions are most uncertain?
  • What are the leading indicators of traction?
  • At what point do we double down or pull back?

Overall, international expansion can unlock significant growth, but only when it is approached as a series of measurable experiments rather than a leap of faith. By testing assumptions, modelling the cash impact and setting clear milestones upfront, founders can make more confident decisions while protecting runway and staying focused on sustainable growth.