Services · Ecommerce development · Online marketplace websites
Codeeo delivers marketplace ecommerce website development UK operators can trust with other people's money: a web platform where independent vendors list products, buyers check out once across several sellers, and the platform takes its commission before paying each vendor. We build the storefront, the seller dashboard and the operator back office, and we design them around the rules that now apply to UK platforms, from HMRC seller reporting to the fake review ban.
A single-brand shop answers to one set of terms. A marketplace answers to buyers, vendors, HMRC, the CMA and its payment provider at once. Getting that right in the build costs far less than retrofitting it after the first tax deadline or complaint.
200+ companies servedFrom a first store to an ADX listed developer
What the platform includes
Most marketplace projects start with the storefront mock-ups. We start with the money: who collects the payment, how commission is calculated, when a vendor gets paid and what happens when a buyer asks for a refund three weeks later. Once those flows are agreed, the catalogue, search and checkout follow naturally. The capabilities below are the ones UK operators most often need at launch. Some can wait for a second release, and we will say which ones in discovery rather than building everything at once. Each sits on a web platform you own, connected to a regulated payment provider so your company does not hold vendor funds itself, and each is designed so your operations team can run it without asking a developer for routine changes.
A staged application for sellers: business or individual status, Companies House number where one exists, VAT registration, bank details and identity checks run through your payment provider. Applications wait in a review queue until your team approves them, and missing information is chased automatically.
Only verified vendors reach buyers, with records kept for HMRC.
Since January 2024 UK platform operators must collect and verify seller details and report seller income to HMRC each year. The platform stores taxpayer references, addresses and dates of birth or registration numbers, totals each seller's consideration and exports the annual report, with a copy for every seller.
The January reporting deadline becomes a routine export.
Buyers add items from several vendors and pay once. The order is split behind the scenes into one sub-order per seller, each with its own delivery method, dispatch status and returns window, while the buyer sees one clear confirmation and one receipt.
One payment for the buyer, clean orders for every vendor.
Payments run through a marketplace product from a regulated provider, so funds move to vendors without passing through your own bank account. Strong Customer Authentication, Apple Pay, Google Pay and pay by bank through Open Banking are handled at checkout, and payouts follow the schedule and reserve rules you set.
Vendors are paid on schedule and you stay outside client money rules.
Commission by category, vendor tier or individual agreement, plus listing fees, subscription plans for sellers and promoted placement. Every fee is shown on the vendor statement, and any buyer-side service or delivery charge is included in the price shown up front, as the drip pricing rules now require.
Fees your vendors understand and buyers never find at the last step.
When a seller based outside the UK sells goods already in the UK, or ships low-value consignments from abroad, the marketplace itself may be treated as the supplier for VAT. The checkout tags those orders, applies the right treatment and keeps the evidence your accountant needs.
VAT follows the seller's location, not guesswork.
Returns requests, the 14-day cancellation period under the Consumer Contracts Regulations for trader sellers, partial refunds and a dispute desk where your team sees the order, the messages and the delivery evidence before deciding who bears the cost.
Disputes settled on evidence, with a record of every decision.
Reviews only from verified purchases, disclosure of any incentive, flags for suspicious patterns and a published review policy. The Digital Markets, Competition and Consumers Act 2024 bans fake reviews and expects platforms to take reasonable steps to stop them, and the CMA can enforce directly.
Ratings buyers can believe and a policy the CMA can read.
Prohibited category lists, keyword screening, manual review queues for restricted items and a notice-and-takedown route for unsafe or counterfeit products. The Product Regulation and Metrology Act 2025 lets government set further duties for online marketplaces, so moderation is built to be extended.
Unsafe or counterfeit listings come down fast and leave a trail.
Who this is for
A marketplace is a different business from a shop, even when the front end looks similar. The operator earns from commission or fees, carries responsibility for vendors it does not employ and needs enough sellers and buyers at the same time for either side to stay. These are the starting points we see most often across the UK, and the platform we build differs for each. Marketplace online store development UK founders ask us about usually begins with one of these four situations, and naming yours early shapes the whole scope.
You already sell your own stock online and want to extend the range without buying more inventory. We add vendor accounts, commission and split payouts alongside your existing catalogue, so your own products and partner products share search, basket and checkout. Your warehouse orders keep flowing as they do now, while partner orders route to the vendor who ships them.
Your own stock and vendor stock in one basket.
You have a category, a community and a handful of committed sellers. The first release needs vendor onboarding, a clean checkout, payouts and reviews, and very little else. We keep the scope tight, choose a stack that can grow, and plan the second release around what your first sellers and buyers actually ask for once trading begins.
Trade buyers want account pricing, minimum order quantities, purchase order numbers and invoices that their finance teams accept. We build business accounts with several buyers per company, approval limits and VAT invoices from each supplier, and we keep consumer rules separate from trade rules so the right protections apply to the right customer.
Consumer and trade rules kept apart.
Plugins bolted onto a single-vendor shop, spreadsheets for payouts, manual HMRC exports. We plan a migration that moves vendors, listings, orders and reviews to a platform designed for multi-vendor trading, keeps your URLs and search rankings through redirects, and lets sellers carry on trading during the move.
How we work with you
Codeeo has delivered 200+ projects across the UAE and the US, with a team of 80+ across Dubai, Riyadh and Karachi. We have no UK office, so we work with UK clients remotely: discovery, design reviews and release demos run by video call, and decisions are recorded in a shared project space your team can check at any time. You get one project lead, a fixed list of what each release contains, and access to staging from the first sprint. If you are weighing a marketplace ecommerce development company UK based against a remote team like ours, ask both for the same things: a written scope, named releases and full ownership. We are rated 4.7 from 23 Google reviews.
A defined build with a deadline
We agree what the product has to do, write it down with a price and a date, and build exactly that. Changes are priced before they are made, not discovered on the invoice.
A product that keeps evolving
Named engineers who work your hours, join your standups and stay on the codebase. You direct the backlog; we own the quality of what ships.
Something live that needs looking after
A monthly block of hours for improvements, fixes and the small requests that otherwise wait months. Unused hours carry for a quarter.
Technology
The stack depends on scale and your team. Many marketplaces run on a headless setup with a Next.js storefront and a custom Laravel or Node back office; others start on Shopify or WooCommerce with a multi-vendor layer. Payments go through a provider with a marketplace product built for split payouts. Marketplace ecommerce website design UK buyers respond to is plain and fast: clear seller identity on every listing, delivery estimates before the basket, and pages that work on a phone over a weak signal.
01Web
02Commerce
03Data and cloud
04Marketing and tracking
Vendor onboarding, split payments, commission, payouts, disputes and seller reporting on top of the usual catalogue and checkout.
A normal store sells its own stock, so one company takes payment, ships and handles returns. A marketplace has many sellers, so the platform must verify each one, split every order and payment, deduct commission, pay vendors on a schedule, and decide disputes between parties who never meet. In the UK it must also collect seller details for HMRC, apply VAT rules for overseas sellers, run an honest review system and show all mandatory fees up front. Those layers are most of the work.
Schedule a free consultation and get a written recommendation, with costs, before you commit to anything.
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