How to Build a Two-Sided Marketplace Platform in Australia (Cost & Guide)

Marketplace platforms are some of the most valuable — and hardest — products to build. Here's what a two-sided marketplace actually costs and how to avoid the mistakes that sink them.

Airbnb, Uber, Airtasker — every major marketplace started as two problems solved at once: getting supply (hosts, drivers, workers) and demand (guests, riders, customers) onto the same platform at the same time. Marketplace platforms are some of the most valuable products you can build, and also some of the hardest to get right. Here's what actually goes into building one in Australia, what it costs, and where most marketplaces fail before they even get traction.

What makes a marketplace different from a normal app

A standard app or website has one type of user. A marketplace has at least two — supply and demand — and needs to serve both well while managing the connection, trust and transaction between them. That means a marketplace typically needs:

• Two separate user experiences: one for the people listing (services, products, space), one for the people buying or booking
• A listings or profile system with search, filtering and categories
• A trust layer — reviews, ratings, verification, or ID checks
• Payments that can split funds between the platform and the seller (not just a simple checkout)
• Messaging or booking flow between both sides
• An admin dashboard to moderate listings, handle disputes and monitor activity

What a marketplace platform costs in Australia (2026)

• Simple MVP marketplace (core listing + booking flow, one platform — web or app): $25,000–$45,000
• Standard two-sided marketplace with payments, reviews and messaging: $45,000–$90,000
• Full-featured marketplace across web and mobile, with admin tools and analytics: $90,000–$200,000+

Payment processing (via Stripe Connect or similar) that splits funds between the platform and individual sellers is a meaningful chunk of the build — it's significantly more complex than a standard ecommerce checkout, since money needs to flow to multiple parties with the platform taking a cut.

The real challenge: the chicken-and-egg problem

The hardest part of a marketplace isn't the code — it's that buyers won't show up without listings, and sellers won't list without buyers. Plan for this before you build:

1. 1Pick one narrow niche or location to launch in, rather than trying to be everything everywhere at once.
2. 2Manually recruit your first supply-side users yourself before the platform is even live, if you have to.
3. 3Consider seeding the platform — a small number of quality listings beats a large number of empty or low-quality ones.
4. 4Build in public feedback loops (reviews, ratings) from day one so trust compounds as you grow.
5. 5Launch an MVP fast rather than building every feature before you have real users — you'll learn what matters once people are actually using it.

Most marketplaces don't fail because the software was bad — they fail because nobody solved the chicken-and-egg problem before writing a line of code.

Build vs off-the-shelf marketplace software

Off-the-shelf marketplace builders exist and can get something live cheaply, but they come with real trade-offs: you don't own the platform, you're limited to whatever features the builder supports, and you'll typically pay ongoing transaction fees on top of your subscription. For a marketplace with a genuinely differentiated model — a specific niche, a unique matching or booking flow — a custom build gives you full ownership and the flexibility to actually build the features that make your marketplace different from the generic template everyone else is using.

AusWebDevs has built two-sided marketplace platforms for Australian businesses — including a student task marketplace — handling everything from listings and payments to admin tooling under one roof. If you're exploring a marketplace idea, get in touch for an honest read on scope and cost.