Starting a Two-Sided Marketplace in the UK: How To Get the First 100 Users on Both Sides

Two-sided marketplaces are highly valuable business models globally, but they notoriously fail due to the 'chicken-and-egg' problem. This occurs when there are no buyers without sellers and vice-versa. This guide provides a practical UK-centric approach to overcome these initial challenges.

Before committing, founders should critically assess if a marketplace is truly necessary. Many ideas might be better served as directories, Software-as-a-Service (SaaS) platforms, or traditional single-sided businesses. If real-time coordination for transactions isn't fundamental, a marketplace's complexities might be an unnecessary burden.

Identifying the Harder Side

The first actionable step is to identify and manually seed the 'harder' side of your marketplace. One side always presents a greater challenge for user acquisition. For example, in a dog-walking marketplace, securing vetted dog walkers (supply) is typically harder than attracting dog owners (demand).

In every two-sided platform, one side presents a greater challenge for user acquisition. Identify and focus your efforts there first.

Conversely, for a B2B services marketplace, finding suitable clients (demand) is often more difficult than recruiting consultants (supply). Once identified, actively recruit the first 50–100 individuals or businesses for this harder side yourself. Recruitment should involve direct outreach, networking within relevant communities, and offering introductory incentives. For a freelance graphic designers marketplace, attending local design meetups, reaching out on LinkedIn, and offering a waived commission on early projects can build initial supply.

Hyper-Local Launch Strategy

Avoid the temptation to launch nationally from the outset. Instead, focus your initial efforts on a hyper-local launch within a single town or postcode. UK cities like Brighton, Bristol, and Leeds are popular choices due to their vibrant tech communities and dense urban environments.

This focused geographic approach allows for more efficient user acquisition and relationship building. For example, launching a local food delivery marketplace in a single neighbourhood lets you personally visit restaurants, understand their challenges, and engage directly with early customers, fostering a stronger community.

Avoid the temptation to launch nationally from the outset. Instead, focus on a hyper-local launch in a single town or postcode.

During the initial 2-3 months, operate as the 'man behind the curtain', faking automation where possible. Instead of investing heavily in complex software, manually match buyers and sellers using simple tools like spreadsheets, email, and WhatsApp. As a UK founder, you might personally coordinate bookings and payments via bank transfers initially, even if it feels primitive. This provides invaluable insights into user workflows and pain points, ensuring that any subsequent automation addresses genuine needs.

Building Trust and Financial Infrastructure

Trust is the cornerstone of any successful marketplace. Implement robust mechanisms to foster it, including:

• User reviews
• Identity verification (e.g., platforms like Onfido or Persona offer excellent UK-compliant ID verification services)
• A clear guarantee or insurance policy for buyers

In cases of disputes, be prepared to absorb the cost of the first few incidents yourself; this demonstrates commitment and builds a strong reputation for reliability. From day one, integrate a robust payment splitting solution. Stripe Connect is the industry standard for this, natively supporting UK marketplaces. It handles the complex process where the buyer pays the platform, the platform deducts its commission, and the remaining funds are disbursed to the seller.

Attempting to build such a system in-house is a significant undertaking, prone to errors, and can lead to compliance issues, particularly with UK financial regulations. Set up linked accounts and reconcile regularly.

Monetisation and Liquidity

Deliberately choose your commission model based on your marketplace's characteristics. Three common models prevail:

• A take rate (e.g., Airbnb's ~15% cut)
• A subscription model (similar to Patreon's flat fees)
• A lead fee model (like Bark.com's pay-per-introduction)

The take rate is generally most effective for high-value transactions where the platform clearly adds significant value. A subscription model suits sellers benefiting from continuous visibility and user access. Lead fees are ideal for one-off, high-consideration purchases where introductions are the primary value.

Achieving liquidity requires a critical mass on both sides simultaneously. Aim to onboard your first 100 buyers and 100 sellers within the same week. A marketplace where one side is dormant will quickly fail. Plan a co-launch strategy: secure your initial supply first, then execute a concentrated demand-side launch (e.g., through PR, strategic partnerships, or targeted paid advertising spikes) within 1-2 weeks. This ensures both sides perceive immediate value and engagement. For example, prepare your 100 service providers, then launch an intensive digital advertising campaign aimed at your target customer demographic in your chosen postcode, coupled with local press outreach. This concentrated effort creates a 'spike' in activity, proving the marketplace's viability to early adopters.

Key Performance Indicators and Financial Setup

The key performance indicator for a marketplace is not Gross Merchandise Volume (GMV) but liquidity. Focus on metrics such as 'what percentage of buyers find a match within X minutes' and 'what percentage of sellers receive a booking within Y days'. High GMV with poor liquidity indicates a marketplace that is slowly stagnating, as users are not efficiently connecting and transacting. For instance, if your dog-walking marketplace has many registered users but only 10% of booking requests are fulfilled within an hour, your liquidity is poor. A healthy liquidity metric might be 80% of booking requests fulfilled within 15 minutes, indicating an efficient and engaging platform.

From an operational standpoint, establish a UK limited company. This can be done rapidly and cost-effectively, typically for around £50 and taking approximately 15 minutes via the Companies House website (gov.uk). Subsequently, open a Tide business account. Crucially, Stripe Connect payouts require a dedicated UK business bank account, making Tide a convenient and popular choice for SMEs. This keeps personal and business finances separate, which is vital for compliance and clarity. To manage initial expenditure, particularly on marketing and essential software subscriptions, apply for a Capital on Tap business credit card. This provides a credit line suitable for nascent businesses and often comes with attractive rewards. Finally, integrate all these financial accounts with Xero, a robust cloud accounting platform. The financial administration of a marketplace, with its split payments and commissions, is inherently more complex than a typical SaaS business. Establishing clean, integrated systems from day one is absolutely non-negotiable for future scalability and accurate reporting.

Niche Focus and Financial Runway

Be prepared for a lengthy monetisation timeline. Marketplaces are notoriously slow to generate significant revenue, with a typical expectation of 12–18 months before the take-rate revenue becomes meaningful. This initial period is often characterised by high operational costs and limited income. Furthermore, the seeding phase of a marketplace is capital-intensive. Successful independent marketplaces are frequently either self-funded by the founders for the first 18 months or initiated as a part-time venture alongside a stable, income-generating day job. This ensures financial runway during the critical early growth stages.

Recent successful UK marketplaces have avoided attempting to become a universally applicable 'Uber of X'. Instead, they meticulously identify a niche category, dominate it within a specific city or vertical, and only then consider expansion. Resist the overarching ambition to launch nationally immediately; instead, prove your model and achieve market saturation within a single postcode first. An example of this focused approach is a local platform connecting residents with independent bakers for custom cake orders in Manchester, rather than attempting to be the 'national cake delivery app'. Such a focused strategy allows founders to deeply understand their users, build strong community ties, and refine their offering before scaling up.

Bottom Line

Successfully launching a two-sided marketplace in the UK requires a strategic, patient, and intensely focused approach, particularly in the critical early stages. Prioritising hyper-local concentration, manual operations to gather insights, and robust trust-building mechanisms are paramount. Prepare for a significant upfront investment of time and capital, as achieving critical liquidity and meaningful monetisation can take 12-18 months.