What is the FMB (Federation of Master Builders)

Full definition

The Federation of Master Builders (FMB) is the UK's largest trade association representing small and medium-sized building companies. It was established in July 1941 by 15 small builders who came together during the reconstruction effort following the London Blitz. The FMB is a not-for-profit membership organisation, meaning subscription fees are reinvested into services and advocacy for members rather than distributed as profit.

Membership is open to sole traders and SME construction companies based in the UK that can demonstrate a minimum of 12 months of trading history. Before being admitted, applicants must pass an independent inspection and vetting process to verify that their workmanship, business practices, and insurance meet the FMB's standards. This entry requirement distinguishes FMB membership from directories that accept businesses on a self-declared or subscription-only basis.

The FMB is also the largest Scheme Provider within TrustMark, the government-endorsed quality scheme for domestic work, having joined TrustMark as a founding scheme provider in 2005.

Why it matters for trades / trust signal

The FMB badge carries over 80 years of institutional history, making it one of the most recognisable credentials a small builder can display in the UK. For homeowners, the badge signals that the contractor has been independently assessed and is accountable to a trade body with established complaint and expulsion procedures.

For FMB members, the association provides practical commercial benefits: a library of plain-English building contracts, access to specialist insurance products, guidance on employment law and Health and Safety regulations, and a dispute resolution service that helps resolve disagreements with clients without litigation. Members also benefit from the FMB's lobbying activity on planning reform, skills policy, and construction industry taxation — policy areas that directly affect the revenue environment for small building companies.

How to get listed / registered

The FMB membership application process involves:

1. Eligibility: Sole traders and SME building companies with at least 12 months of trading history in the UK.
2. Application: Submit a membership application via the FMB website at fmb.org.uk, including business and insurance details.
3. Independent inspection: An independent assessor visits a current or recently completed project to evaluate workmanship and site management.
4. Vetting checks: Financial and reference checks are conducted alongside the site inspection.
5. Ongoing monitoring: Accepted members are subject to periodic review; members who fail to maintain standards or who generate serious complaints can be removed from the register.

Members who register their business through the FMB's TrustMark Scheme Provider route also appear in the TrustMark public directory at trustmark.org.uk.

Difference from commercial trade directories

Dimension	FMB	Checkatrade / MyBuilder
Organisation type	Not-for-profit trade association (since 1941)	Commercial platform
Entry assessment	Independent site inspection and vetting	Background and insurance checks; review-based
TrustMark Scheme Provider	Yes — largest provider	No
Contract templates	Yes — FMB building contracts included	No
Policy lobbying	Active at Westminster and devolved governments	None
Dispute resolution	FMB internal resolution service	Platform mediation only
Membership basis	Annual subscription; quality-gated entry	Subscription or pay-per-lead

Related terms

TrustMark, Which? Trusted Traders, Lead aggregator.