Definition of Business

Category: Policy definitions · Reviewed by the Apex broking team · Last reviewed 2026-08-22 · ~4 min read

Definition

In most UK professional indemnity and commercial liability wordings, “Business” is a defined term whose content is supplied by the schedule — a phrase such as “chartered surveyors”, “IT consultancy and software development”, or “management consultancy and training”. The insuring clause then indemnifies the insured against civil liability arising from the conduct of that Business, or from the provision of Professional Services in connection with it. The definition therefore performs the same function as a boundary fence: everything inside it is potentially covered subject to the rest of the wording, and everything outside it never reaches the rest of the wording at all.

Business and Professional Services are not the same term

Many wordings use both. Where they do, “Business” usually describes the enterprise as a whole and “Professional Services” describes the specific activities performed for clients — see definition of Professional Services. The insuring clause will attach to one, the other, or both, and reading which is essential. A policy that covers “Professional Services performed in connection with the Business” has two gates, not one, and a new service line can pass the second while failing the first.

Why an activity outside the definition is uninsured

There is no partial cover. If a consultancy described as “management consultancy” begins recruiting staff for clients, or an architectural practice starts acting as principal designer, or a bookkeeping firm starts giving tax advice, the resulting liability arises from an activity the insurer never rated, never underwrote and never agreed to insure. The claim does not come within the insuring clause. This is not an exclusion the insured can argue around; it is the absence of a grant of cover, and the burden of bringing a claim within the insuring clause sits with the insured.

Where the drift comes from

The definition is usually accurate on the day it is written and inaccurate two years later, because businesses change faster than schedules. The recurring triggers are: a new service line launched without telling the broker; a large client persuading the firm to take on adjacent work; an acquisition that brings in a different discipline; a subsidiary or joint venture that is not a named Insured; and work performed for a related entity or overseas group company that the schedule does not contemplate. Each of these is easy to fix in advance and impossible to fix after a claim.

How to get the definition right

Four practical tests. Read the schedule wording aloud against your current fee income and ask whether every material revenue line is recognisably within it. Check whether the description is drawn narrowly (“structural engineering”) or broadly (“engineering consultancy”), because breadth is negotiable at renewal and worth paying for. Check who the definition of Insured captures — see definition of Insured — because a correct Business description on the wrong legal entity does not help. And confirm whether the description covers past activities as well as current ones, since professional indemnity is claims-made and today’s policy answers for work done years ago.

What to do when it changes

Tell the broker before the work starts, not at renewal. Most insurers will endorse an amended description mid-term, sometimes for no additional premium, if the new activity is close to the existing one. Where it is not, the insurer needs the opportunity to price it or to decline it — and an insurer that declines to extend the description has at least told you the exposure is uninsured while there is still time to do something about it. Where a change is material, it is also a matter for the duty of fair presentation at the next renewal.

Why it matters

Brokers see more coverage disputes generated by an out-of-date Business description than by any exotic exclusion. It is a free fix: a conversation, an endorsement, and a schedule that matches what the business actually does. The cost of leaving it is the whole claim.

Frequently asked questions

What happens if I do work outside my policy’s Business description?

That work sits outside the insuring clause, so liability arising from it is uninsured rather than partially covered. There is no reduced settlement or higher excess: the claim simply does not fall within the grant of cover.

Is “Business” the same as “Professional Services”?

Not where a wording defines both. “Business” usually describes the enterprise; “Professional Services” describes what is done for clients. Check which term the insuring clause attaches to, because some policies require both to be satisfied.

Can the description be widened mid-term?

Often yes, by endorsement, if the insurer is asked before the new activity begins. The time to raise it is when the work is being considered, not at the next renewal and certainly not after a claim.

Related entries

• Definition of Professional Services
• Definition of Insured
• Definition of Claim
• Insuring clause
• Policy definitions index

This entry is part of the Apex Insurance Wiki. Last reviewed 2026-08-22. Next review: 2027-02-22. It is general insurance information, not legal advice, and it describes UK market practice and law as at August 2026.

Apex Insurance Brokers Limited is authorised and regulated by the Financial Conduct Authority (FRN 724952). This page is general information, not advice on a specific policy.