Definition
A building society is a member-owned financial institution organized for the mutual purpose of pooling members' savings and using those funds to make mortgage loans to members seeking to purchase or build homes. Members contribute regular subscriptions (periodic payments) into a common fund; that fund, in turn, provides the capital from which mortgage advances are made to qualifying members, typically secured by the property being acquired.
The building society occupies a distinct institutional category: it is neither a bank nor a pure investment cooperative, but a mutual lending association in which the roles of saver and borrower are held by the same class of members. Governance follows mutual principles — members hold voting rights, and profits are not distributed to outside shareholders but returned to the institution or its members.
In its classic form, the building society was a terminating association: it dissolved once all members had received their advances and repaid their loans. The permanent building society, which emerged in the nineteenth century and became the dominant form, operates on a rolling-membership basis with no fixed dissolution date.
---
Common Language
Modern common usage (Wiktionary): A type of financial institution which traditionally was based on lending money (as mortgages) to society members to buy houses, from other members' pooled savings and/or money borrowed wholesale.
Historical common usage (Webster's 1913): Not separately defined; treated as a compound of "building" (erecting structures) and "society" (an association of persons).
The common usage captures the institution accurately at a functional level but understates its legal distinctiveness. The critical legal features — mutual ownership, member governance, the subscription-and-advance structure, and the regulatory regime that separates building societies from banks — do not appear in lay descriptions. A researcher relying on ordinary-language sources will understand what a building society does but not how it is constituted or regulated.
---
Recognized Forms
/SUBTYPES
Terminating building society: The original form. Organized for a fixed purpose and a definite membership pool; dissolved automatically once all advances had been made and repaid. Common in the early and mid-nineteenth century.
Permanent building society: Operates on a continuous basis with open membership. New members join as old members complete their loans. This is the form that came to dominate and that is regulated under modern building society legislation.
Converted or demutualised institution: A building society that has converted to a public limited company (in U.K. practice) or equivalent corporate form, surrendering mutual status. After conversion, the institution is regulated as a bank rather than as a building society. Several major U.K. building societies converted to banks in the 1980s and 1990s.
---
Why It Matters in Research
Historical sources in American and English law treat the building society as a well-understood institution, but researchers should be alert to three navigational hazards.
First, jurisdiction shapes the term's legal weight substantially. In England and Wales, building societies are a living regulatory category governed by statute and administered by a dedicated regulator. In the United States, the institution evolved into the savings and loan association (also called a savings bank or thrift institution), which carries its own distinct statutory and regulatory history. American legal sources from the nineteenth and early twentieth centuries may use "building society," "building and loan association," and "savings and loan" interchangeably or in partially overlapping ways; these are not identical institutions in their regulatory specifics.
Second, the terminating/permanent distinction matters for historical research. Cases and treatises from before roughly 1850–1870 often assume the terminating model; later sources assume the permanent model. The internal legal relationships — members' rights on dissolution, liability for assessments, priority among creditors — differ between the two forms.
Third, building society law intersects the law of mutual associations, real property security, and financial regulation. Researchers tracing mortgage lending practices, cooperative finance, or the history of homeownership policy will encounter building society materials across all three of those bodies of law. The corpus connections run to mortgage instruments, subscription contracts, and early consumer lending regulation.
---
Historical Dictionary Support
Both editions of Black's Law Dictionary define the building society in nearly identical terms: an association in which member subscriptions form a capital stock or fund from which advances are made to members on mortgage security. The first edition's definition is complete; the second edition's entry appears truncated in available sources but tracks the same formula.
These definitions are accurate as far as they go but deliberately spare. They capture the transactional mechanics (subscription → fund → mortgage advance) without addressing governance structure, the terminating/permanent distinction, the mutual ownership character, or the regulatory framework that distinguishes building societies from other lending associations. A researcher using Black's alone will have a serviceable working definition but will miss the institutional and regulatory context that becomes critical in any substantive research.
Neither edition addresses the American evolution toward savings and loan associations or the divergence between English and American law on this point — a significant gap given that the building society concept arrived in the United States and was immediately adapted into a distinct legal form.
---
Jurisdictional Note
In England and Wales, building societies remain a distinct legal category regulated under the Building Societies Act 1986, as amended, with oversight now vested in the Prudential Regulation Authority and Financial Conduct Authority. In the United States, the functional equivalent is the savings and loan association or savings bank, which developed from building society predecessors but was early subjected to separate state and federal regulatory regimes. The terms are not interchangeable across jurisdictions in legal research.
---
Encyclopedia Cross-Reference
No Law Mind Encyclopedia entry directly addresses building societies or mutual lending institutions as such. For related institutional and transactional context, see:
The Law Mind Real Estate Transactions & Construction Encyclopedia — Build-to-Suit Agreements: Development, Lease, and Delivery Obligations (realestate_62), for background on development financing structures.
---