Definition
A special custom is a particular or local custom — a rule or practice that has the force of law within a defined geographic area or among a specific community, but that does not extend throughout the broader jurisdiction. It stands in contrast to general custom, which operates across an entire country or legal system.
For a practice to qualify as a special custom, it must meet the same basic requirements as custom generally: it must have existed for a long time (traditionally "time immemorial"), been observed consistently, been accepted as obligatory rather than merely habitual, and been recognized as reasonable. The "special" or "local" character refers solely to the limited geographic or communal scope of the custom's operation — it binds those within the district or locality where it prevails, not the general public.
Special customs were most consequential in property law, particularly regarding rights over land, water, commons, and roads, where local usage often defined entitlements that statutory or common law left unaddressed. They also appeared in commercial and trade contexts, where the practices of a particular market or port town might govern contracts and dealings among merchants there.
Common Confusion
SPECIAL CUSTOM vs. GENERAL CUSTOM: General custom is the custom of the entire realm — the source from which the common law itself is theoretically derived. Special custom is confined to a particular locality. The distinction matters because different rules of proof apply: a general custom may be established by reference to common legal usage, whereas a special custom must be affirmatively pleaded and proved by the party relying on it. Courts will not take judicial notice of a special custom the way they might recognize general principles of law.
SPECIAL CUSTOM vs. TRADE USAGE: A special custom is geographic in character; trade usage or mercantile custom is occupational or commercial in character. The two concepts overlap — a custom among merchants in a particular port could be both — but they are analytically distinct. Trade usage developed its own body of doctrine and ultimately fed into the law merchant and codified commercial law.
SPECIAL CUSTOM vs. PRESCRIPTION: Prescription is a related but distinct doctrine under which individual rights (such as an easement or profit) are acquired through long use. Special custom creates a rule binding on a community; prescription vests a right in a particular person. The two doctrines share common evidentiary requirements (long use, continuity, acquiescence), and historical sources sometimes treat them together, which can cause confusion in older authorities.
Why It Matters in Research
Researchers working in English legal history or in American property disputes inherited from English practice will encounter special custom frequently in sources before the mid-nineteenth century. Several issues deserve attention:
First, older sources — including Blackstone and the early American treatise literature — use "special custom," "local custom," and "particular custom" interchangeably. The terminology is not standardized. When reading historical decisions or pleadings, all three phrases should be treated as equivalent unless context indicates otherwise.
Second, the doctrine of special custom was not merely academic. English manorial law, copyhold tenure, rights of common, and local market regulations all rested substantially on special custom. American courts inherited this framework and applied it, with varying degrees of enthusiasm, to disputes about local land-use rights, fishing privileges, and access to waterways. The doctrine surfaces in early Maine, Massachusetts, and Virginia decisions where colonial-era local practices needed legal grounding.
Third, the evidentiary burden is a research trap. Because a special custom had to be pleaded and proved, the record of litigation — rather than statutes or treatises — is often the best source for what a particular local custom actually was. Researchers looking for the content of a historical local custom should search court records and reported decisions from the specific locality, not general legal encyclopedias.
Fourth, as codified statutes displaced customary rules through the nineteenth and twentieth centuries, "special custom" retreated from mainstream legal usage. In modern American law, the concept survives most visibly in two areas: (1) local land-use and water-rights disputes in Western states, where prior appropriation and irrigation customs were recognized as legally operative; and (2) the law of custom and trade usage embedded in the Uniform Commercial Code, which treats established commercial practices as gap-fillers in contracts.
Historical Dictionary Support
Black's Law Dictionary and Bouvier's Law Dictionary are in complete agreement on substance: both define special custom as a particular or local custom, contrasted with the general custom of the whole country. Both cite the same Maine authority (23 Me. 95), suggesting the American treatise tradition drew on a common line of cases rather than independent research.
Bouvier's cross-reference to its general CUSTOM entry is important: the full doctrine — including the requirements of antiquity, continuity, peaceable enjoyment, compulsory force, consistency, and reasonableness — is elaborated there, not under this entry. Researchers relying solely on the SPECIAL CUSTOM entry in older dictionaries will get the label without the substance; the general CUSTOM entry supplies the operative legal tests.
What neither historical dictionary addresses is the procedural dimension: the requirement that special custom be specially pleaded in common-law practice, the standard of proof, and the consequences of failure to establish the custom. Those matters must be sourced from treatises and case law. Blackstone's Commentaries (1 Bl. Comm. 67, the citation in Black's) remains the starting point for the doctrinal framework, though Blackstone's treatment is descriptive rather than analytically rigorous by modern standards.
Note also that one of the Bouvier entries reproduced here appears to be a misattributed fragment ("a statement of the actual facts of the particular case") belonging to a different entry entirely. Researchers using digitized versions of Bouvier should be alert to this kind of cross-contamination between entries, a known artifact of OCR processing and early digitization.
Encyclopedia Cross-Reference
The Law Mind Torts & Personal Injury Encyclopedia, torts_11: Negligence — Custom and Industry Practice as Evidence of Standard. While that entry addresses the modern evidentiary use of custom to establish negligence standards, it provides useful context for understanding how courts evaluate the legal weight of established practices — a question continuous with the older doctrine of special custom.