Alternative Legal Service Provider (ALSP): A Guide for UK Law Firms

Most of what ranks for "alternative legal service provider" is written for general counsel, who use ALSPs to buy around their panel firms. UK law firms buy from ALSPs too, and for different reasons: protecting margin on fixed-fee work, absorbing a disclosure spike without hiring for it, and holding down a back office that costs more every year. The people who sign that contract are usually a Managing Partner, a COO or a Finance Director, with a Head of IT or Innovation close behind.

At a Glance

• An alternative legal service provider (ALSP) delivers legal work or legal support outside the traditional law firm model, typically document review, disclosure, contract work, claims handling, legal technology and process work.
• UK law firms use ALSPs to hold margin on fixed fees and high-volume work, and to add capacity without adding permanent headcount.
• Under the SRA Code of Conduct for Firms, your firm remains accountable for work carried out through others, so choosing an ALSP is a compliance decision as well as a commercial one.
• ALSPs now split into two models: providers that do the same work with cheaper people, and providers that rebuild the work with AI and share the saving.
• Before signing, find out where your data will sit, who owns anything built during the contract, and how the price moves when volume does.

What is an Alternative Legal Service Provider?

An alternative legal service provider is a business that delivers legal or legal-adjacent work without operating as a traditional law firm. The work is usually high in volume and heavy in process: first-pass document review, disclosure and eDiscovery support, contract extraction, claims handling, redaction, legal research and the technology that sits underneath all of it.

The category is broad. It includes independent providers, managed review businesses, the legal arms of accounting and consulting firms, subsidiaries set up by law firms themselves, and legal technology firms that run delivery teams alongside their software. What they share is a starting assumption: a large part of legal work is process, and process does not need to be priced at partner rates.

ALSP is the abbreviation you'll see most often, and the terms legal process outsourcing (LPO) and legal managed services overlap heavily with it. In practice, LPO usually describes the delivery work itself, while ALSP describes the type of business doing it.

Why UK Law Firms Use An Alternative Legal Service Provider

Fixed fees moved the risk. When a client agrees a price before the work starts, every extra hour spent on review or admin comes straight out of the firm's margin. An alternative legal service provider gives the firm a lower and more predictable cost for the parts of the matter that are process, which is often where the overrun happens. Our piece on how top law firms are rethinking pricing covers the pricing side of this.

Volume rarely arrives evenly. A disclosure exercise, a regulatory investigation or a block of new claims can triple the review workload for a few months. Hiring for the peak leaves the firm carrying salaries once it passes, and contract reviewers hired directly still need supervision, onboarding and technology.

The back office keeps getting more expensive. Billing, onboarding, conflicts, records and matter support grow with the firm, and they rarely get cheaper per matter. We've written about why law firm support costs keep rising and what changes the curve.

Some capability is hard to hire. Data engineering, AI tooling and legal engineering sit in a small talent market, and firms that need these skills for one programme often find an outside team quicker than a recruitment cycle. Our guide to resource augmentation for law firms sets out when that route makes sense.

Two Kinds of Alternative Legal Service Provider

The first model is labour arbitrage. The provider takes the firm's existing process, moves it to a lower-cost team, often offshore, and charges per hour or per person. The saving is real, and it arrives early. It also tends to flatten after the first year, because the process itself hasn't changed and the provider earns more when the work takes longer.

The second model rebuilds the work. The provider redesigns the process with AI doing the extraction, triage and first draft, and puts people where judgement is needed: quality control, escalation and anything a client will rely on. Pricing moves towards outcomes or a share of the saving, so both sides gain when the work gets faster.

This second model is what we call Cognitive Outsourcing™. We take over a defined function, rebuild it AI-first, share the savings with the firm, and hand the AI assets back at the end of the term. The difference shows most at renewal. A labour model leaves the firm with an invoice and the same process it started with; a rebuild leaves it with working systems it owns.

Most providers will describe themselves as the second kind. The pricing schedule is the quickest test: if the main unit is still an hourly rate or a headcount, the process probably hasn't changed much.

What the SRA Expects When You Use An ALSP

Regulatory responsibility stays with the firm when work moves to an alternative legal service provider. Paragraph 2.3 of the SRA Code of Conduct for Firms states that you remain accountable for compliance with the SRA's regulatory arrangements where your work is carried out through others. Paragraph 3.3(b) requires that relevant information held by third parties carrying out functions on your behalf is available to the SRA where those functions are critical to your legal services.

Confidentiality follows the work. Paragraph 6.3 requires the firm to keep the affairs of current and former clients confidential, and that duty applies in full while a supplier is doing the review.

Data protection adds a second layer. Where the ALSP handles personal data on the firm's behalf, it acts as a processor, and the ICO's guidance on controller and processor contracts says a written contract must be in place. That contract has to cover processing only on documented instructions, security measures, rules on sub-processors, audit rights, and the return or deletion of data at the end.

In practice, your COLP should review the due diligence before the contract is signed. If AI is part of the delivery, our guide to the SRA AI warning notice sets out what the firm needs in place.

How to Choose an Alternative Legal Service Provider

These are the questions we'd put to any provider, including ourselves.

1. Where does our data sit? Ask whether documents leave your environment, which jurisdictions they pass through, and whether any AI model is trained on them. The strongest answer is that the tooling runs inside your own tenant.
2. What does the security certification actually cover? Ask to see the certificate itself. Check the entity named, the scope wording and the certification body, then confirm the certified entity is the one doing your work.
3. Who supervises the work? Find out how output reaches a qualified lawyer, who signs off quality, and how errors are caught and escalated.
4. How is the price set, and what happens when volume drops? A model that only works at peak volume will cost you in a quiet quarter.
5. Who owns what gets built? Workflows, prompts, data models and trained classifiers created during the contract should be clearly assigned. If the contract is silent, assume they leave with the provider.
6. What does exit look like? Ask for the handover plan on day one, including data return, documentation and knowledge transfer.
7. Can they show it on a matter like ours? A pilot on a defined piece of real work tells you more than any demo.

Where 3Rive Fits

3Rive is an AI-first legal technology firm that also runs legal process work for law firms. Our delivery centre in Colombo has more than 120 people and is certified to ISO/IEC 27001:2022 by Bureau Veritas under UKAS accreditation. From there we run legal process outsourcing for document review, early case assessment, claims operations and court-ready redaction.

The AI tooling we use for that work runs inside the firm's own tenant, so documents stay in the firm's environment. Where a firm wants a whole function taken off its hands, we use Cognitive Outsourcing™: we rebuild the function, share the savings, and hand the AI assets back at the end of the term.

We've spent seven years embedded in a top-30 global insurance-led law firm, and the team that scopes the work is the team that runs it.

Sources: SRA Code of Conduct for Firms; ICO, Contracts between controllers and processors.