Commercial Contract Lawyers for UK Businesses

A commercial contract lawyer helps you with your business on a day-to-day basis. By drafting, reviewing, and negotiating the contracts that govern all your business relationships, a good commercial contract lawyer helps you maintain those business relationships and manages your business risks. They act as a strategic ally so that transactions run smoothly and remain compliant with laws.

Especially if you are a start-up (but also more generally), a good commercial contract lawyer can help you think through the details of how you should do business.

A commercial contract lawyer is often involved in the entire lifecycle of a business agreement:

Drafting agreements: writing documents tailored to the specific requirements of a business’s operations. Examples of these are supplier agreements, service contracts, marketplace contracts, and website terms and conditions.

Reviewing & auditing: identifying practical and legal risks, unfair liabilities, or ambiguous language through the close analysis of existing contracts.

Negotiating terms: engaging with counterparties to secure favourable deal terms, manage risk distribution, and establish clear exit strategies.

Risk mitigation: isolating and shielding the business from potential financial losses by structuring specific clauses, like warranties, indemnities, and limits on liability.

Advising on compliance: ensuring that all business arrangements comply with laws and regulations relating to e.g. data protection, market competition and specific industrial practice.

A marketplace contract (Terms of Service (ToS) or Terms and Conditions (T&Cs)) or marketplace agreement is a legally binding agreement that guides the interaction between 1) the marketplace platform, 2) its sellers or service providers or owners of premises or property, and 3) its end buyers or service recipients or renters of premises or property. It may create additional contracts between any two of the three sides as well. 

The three-way relationship structure

Standard contracts only cover two parties (the buy-side and the sell-side). Marketplace contracts must dictate how at least three sides interact, especially regarding transaction fees and data sharing. Ebay and Airbnb are examples of a well-known marketplaces.

A marketplace contract differs from a standard buyer-seller agreement. By placing the platform as an intermediary in transactions, it must simultaneously manage several distinct legal relationships. Here are some key points a marketplace contract should regulate:

Platform to site visitors: basis expectations of all site users and how to register,

Platform to seller: determines compliance, commissions and payments schedules.

Platform to buyer: covers site usage, payment and refund processing.

Seller to buyer: describes the contract of sale between buyer and the seller.

A comprehensive marketplace agreement protects the platform from legal and financial liability by clearly outlining specific rules:

Payment compliance: marketplaces handle money moving between buyer and seller. Without precise legal structuring, you may accidentally trigger strict, expensive financial regulations (like anti-money laundering laws or escrow requirements).

Fee structures & split payments: these provisions detail the commission percentages, subscription fees, payment processing timelines, and how money moves through payment services.

Liability disclaimers: these explicitly state that the platform is an intermediary and is not responsible for defective products, fraudulent sellers, or delayed shipments. If a seller scams a buyer or ships a dangerous product, a poorly written contract could make your platform financially liable for the damage.

Content & IP rights: these clauses require the users to grant the platform a license to display product images and text uploaded by sellers, while protecting the platform's proprietary code and branding.

Content moderation: this gives the platform the contractual right to remove prohibited listings, delete abusive reviews, or terminate user accounts.

Anti-circumvention: this strictly forbids sellers from transacting with marketplace buyers directly, outside the platform.

Dispute resolution: describes how complaints are handled, establishing a resolution process prior to litigation.

Jurisdictional conflicts: If your sellers are in one country and buyers are in another, you will need to cover international consumer rights, data privacy laws (like GDPR), and cross-border tax compliance.

Why a standard e-commerce contract won't work

A standard e-commerce contract is designed for a single business selling its own inventory directly to a consumer. If you are a marketplace owner and you use a standard e-commerce template for a marketplace, you take on the legal liabilities of the seller, but you do not have control of the actual sellers’ actions. If they sell or rent products or services that are substandard, you end up with the responsibility. The marketplace contract is specifically engineered to legally distance your platform from the actual transfer of goods or services, which is right because they do not belong to the marketplace, and the marketplace does not control their provision.

The law does not stop anyone from drafting a contract but in most cases, it is not advisable. You do not legally need a lawyer to draft a marketplace contract, but using one is highly recommended because online marketplaces operate under complex, multi-party legal frameworks and are governed by specific laws depending on what the marketplace does. A marketplace contract must govern relationships between the platform, the buyers and the sellers simultaneously.  A non-lawyer or an AI is very likely to make expensive mistakes.

The risks of DIY marketplace contracts

If you don’t know the rules on acting as a marketplace, you are very likely to go wrong. A good commercial contract lawyer will help you set things up right from the start and save you from making expensive mistakes.

Using a generic contract template you find on the internet or writing the contract yourself exposes your platform to severe financial and legal vulnerabilities.

How an ecommerce marketplace agreement solicitor can help

An ecommerce marketplace agreement solicitor will customise your terms to protect your specific business model by addressing critical operational pillars:

Fee and payout structures: explicitly defining your commission rates, subscription models, transaction fees, and exact payout timelines.

Content and IP ownership: establishing that you own the platform's code and branding, while dictating what rights you have to use product images uploaded by sellers.

Account termination: giving your platform the undisputed legal right to terminate user accounts for a list of reasons, remove counterfeit listings, and freeze suspicious accounts etc.

Dispute resolution: setting up a mandatory step-by-step process for how buyers and sellers must resolve complaints before they can attempt to sue your platform.

In the UK, commercial contract solicitors generally cost between £150 and £400 per hour for mid-market regional firms, going up to £500 to £800+ per hour for senior partners or top-tier London firms. For clear project budgeting, many business owners opt for fixed-fee packages, where a bespoke commercial contract typically ranges from £750 to £10,000+, depending on its complexity.

Estimated cost for a marketplace contract

Because an online marketplace involves a three party relationship (platform + buyer + seller), it requires a more robust, specialised setup than a standard website.

Basic marketplace setup (£1,500 – £2,500): covers your core Terms of Service and standard buyer/seller rules, and a (GDPR compliant) Privacy Policy.

Complex marketplace setup (£3,000 – £10,000+): required if you manage automated split payments, hold funds in escrow, operate globally, or cross heavily into specialised regulations (such as healthtech or fintech tracking).

Key factors that drive the cost up

The number of revisions: fixed fees usually cover a first draft and one round of amendments. Extensive back-and-forth changes will quickly push your fees up. Early scoping of the details will help avoid this. Think of your lawyer like any other service provider who bills for their time and work done.

Negotiation involvement: if you require a lawyer to actively negotiate with your suppliers or partners instead of documenting the agreement, costs will increase based on time spent. However, this may be a cost saving in the long run, depending on their negotiation skills.

Geographic location: firms based in central London often charge significantly higher hourly rates than regional firms.

Innovation Law Limited is a commercial contract lawyer for startups, as well as more established companies, especially those operating in the tech sector.

We offer fixed fees and we avoid charging at hourly rates wherever possible. We take the time to explain your contract to you so that you can implement your business processes properly.

Your commercial relationships will be safe and long-standing, in our hands. We will get you what you need, but in a collaborative way: friendly and stress free!