
Common law, also known as case law, is a system that relies on detailed records of similar situations and statutes to guide legal proceedings because there is no official legal code that can be directly applied to a case at hand. Common law originated in medieval England and is currently used in 49 states and DC in the US, as well as in other parts of the world. Code law, on the other hand, is a comprehensive, codified set of legal statutes created by legislators. This raises the question: are code law and common law the same thing?
| Characteristics | Values |
|---|---|
| Definition | Code law is a civil law that is regularly updated and has standardized codes to create order and reduce bias. |
| Common law, also known as case law, does not have an official legal code and relies on records of similar situations and statutes. | |
| Origin | Civil law is based on Rome and Napoleonic France. |
| Common law is based on medieval England. | |
| System | Civil law is a comprehensive, codified set of legal statutes created by legislators. |
| Common law emphasizes precedent while allowing some freedom for interpretation. | |
| Application | Civil law clearly defines the cases that can be brought to court, the procedures for handling claims, and the punishment for an offense. |
| Common law aims for consistent outcomes by applying the same standards of interpretation, but elements may differ between districts. | |
| Example | Louisiana uses civil law in the US. |
| 49 states and DC in the US, as well as the UK, use common law. |
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What You'll Learn

Common law vs civil law
Common law and civil law are two different legal systems with distinct characteristics and applications. Common law, also known as case law, relies on detailed records of similar situations and statutes as there is no official legal code that can be directly applied to a specific case. It originated in medieval England and is prevalent in countries that were former British colonies or protectorates, including the United States. Common law emphasises precedent while allowing some room for interpretation, which can be beneficial when adapting the law to new situations. In the US, 49 states and Washington, DC, are common law jurisdictions.
Civil law, on the other hand, is a comprehensive and codified set of legal statutes created by legislators. It is rooted in the Roman Empire and was later influenced by Napoleonic France and Germanic codes. Civil law is the most common legal system globally, practised in approximately 150 countries. It is characterised by its reliance on legal codes as the primary source of law rather than judicial precedent. Civil law clearly defines the cases that can be brought to court, the procedures for handling claims, and the punishments for offences. Louisiana is the only US state that heavily relies on civil law, with its private law codified in the Louisiana Civil Code.
One key difference between the two systems is their approach to precedent and interpretation. Common law systems heavily emphasise judicial precedent, recognising prior court decisions as legally binding. In contrast, civil law judges tend to give less weight to precedent and may even be forbidden from pronouncing general principles of law, as in the case of the Napoleonic Code. Common law systems aim for consistency in interpretation, while civil law seeks to create order and reduce bias through standardised codes.
Another distinction lies in their treatment of contracts. Common law systems provide extensive freedom of contract, with few provisions implied by law, requiring all terms to be explicitly stated in the contract. In contrast, civil law systems imply various provisions into contracts, allowing for shorter contracts as ambiguities can be resolved by operation of law. Civil law systems may also have separate administrative laws governing PPP arrangements and enforcing contracts through administrative courts.
In summary, common law and civil law represent two distinct legal traditions with unique features and applications. Common law emphasises judicial precedent and interpretation, while civil law relies on comprehensive legal codes created by legislators. While common law originated in medieval England and is prevalent in former British colonies, civil law traces its roots to the Roman Empire and Napoleonic France, with widespread adoption worldwide.
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Common law marriage
Common law, also known as case law, does not have an official legal code. It relies on detailed records of similar situations and statutes. Judges presiding over a case determine which precedents apply. Common law originated in medieval England, and the US and UK currently operate under a dual system of both common and civil law.
Civil law, on the other hand, is a comprehensive, codified set of legal statutes created by legislators. It clearly defines the cases that can be brought to court, the procedures for handling claims, and the punishment for an offense.
Now, a common-law marriage, also known as a non-ceremonial marriage, is a legal framework that allows couples to be considered married without registering their union formally. It is a marriage that results from an agreement between the parties to consider themselves married, followed by cohabitation, rather than through a statutorily defined process. It is also known as an informal marriage, de facto marriage, marriage by habit and repute, or sui iuris marriage.
Common-law marriage is not recognized in all jurisdictions, but those that do not permit it will typically respect the validity of such marriages lawfully entered in another state or country. In the US, common-law marriage is recognized in seven states and the District of Columbia, and nine other states recognize it with some restrictions.
To be considered a common-law marriage, couples generally need to meet certain requirements. These include living together for a period of time (although there is no statutory requirement for the length of time), having the legal right or "capacity" to marry, and intending to be married and behaving as a married couple.
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Common law in the US
Common law, also known as case law, is a system that relies on detailed records of similar situations and statutes because there is no official legal code that can be applied to a case. In the US, 49 states and Washington, D.C., are common law jurisdictions. Louisiana is the only state that uses civil law.
Common law draws from institutionalized opinions and interpretations from judicial authorities and public juries. It is derived from judicial decisions instead of statutes. In the US, common law rules were originally fashioned based on English common law. Over time, the American legal system matured and created its own common law rules from direct precedent or by analogy to comparable areas of decided law.
While common law is not common among the US states, several states have statutes or allow for common law marriage if certain requirements are met. For example, in 2018, the California Supreme Court decision in Dynamex Operations West, Inc. v. Superior Court articulated a three-part test for determining whether California workers were independent contractors or employees. In response, the California Legislature created a new section in the Labor Code, which codified and expanded on the Dynamex holding.
The value of a common-law system is that the law can be adapted to situations that were not contemplated at the time by the legislature. However, historically, common law traditions have led to the unfair marginalization or disempowerment of certain groups. Past decisions continue to shape future rulings until societal changes prompt a judicial body to overturn the precedent.
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Common law in the UK
Common law, also known as case law, is a system of law that originated in England during the early Middle Ages in the King's Court (Curia Regis). It is a body of law based on institutionalised opinions, interpretations, and precedents set by earlier judicial decisions, customs, and usages. Common law is not codified and relies on detailed records of similar situations (precedents) to inform the decision-making process in new cases.
In the UK, common law forms the foundation and prime source of English law, which comprises mainly criminal law and civil law. Common law is particularly prominent in criminal law, where it establishes the main elements of a crime: the actus reus (prohibited action) and mens rea (criminal intent). Common law also recognises common-law marriage, which grants similar rights to those with a marriage license to couples who are not officially married if specific conditions are met.
While statutory legislation, including Acts of Parliament, regulations, and by-laws, takes precedence, common law serves as the residual source of law in the absence of statutory law. Common law is made by sitting judges who apply both statutory law and established principles derived from the reasoning of earlier decisions. This allows for the adaptation of the law to new situations not contemplated by the legislature.
The UK, like the US, operates under a dual system of both common and civil law. However, unlike the US, where common law is less prevalent, the UK's legal system is historically rooted in common law. This is because US common law originates from medieval England, and the UK, specifically England and Wales, continues to recognise common law as a significant source of law.
It is important to note that while England and Wales share a common-law system, Scotland and Northern Ireland have distinct legal systems. Scotland's legal system has only been partially influenced by the English common-law system, while Northern Ireland's legal system is outside the scope of English law.
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Code law and interpretation
Common law, also known as case law, does not rely on an official legal code. Instead, it draws from institutionalized opinions and interpretations from judicial authorities and public juries. It places an emphasis on precedent while allowing some freedom for interpretation. The value of a common-law system is its adaptability to situations that were not contemplated at the time by the legislature.
A code of law, on the other hand, is a systematic collection of statutes that aims to cover a complete system of laws or a particular area of law as it existed at the time the code was enacted. In a civil law country, a code of law typically covers the entire system of law, whereas in a common law country, codes of law modify the existing common law only to the extent of its express or implicit provision.
The process of codification is similar in both common law and civil law systems, but their usage differs. Common law originated in medieval England, and today the US and UK operate under a dual system of both common and civil law. Common law traditions have sometimes led to the unfair marginalization or disempowerment of certain groups, as past decisions continue to shape future rulings until societal changes prompt a judicial body to overturn the precedent.
In the Roman Empire, several codifications were developed, including the Twelve Tables of Roman Law and the Corpus Juris Civilis, also known as the Justinian Code. These law codes did not exhaustively describe the Roman legal system, and most legal doctrines were developed by the pontifices, who interpreted the tables to deal with a wide range of situations. The first comprehensive criminal code was the Tang Code, created in 624 AD in the Tang dynasty, which formed the basis of the penal system in China and other East Asian states. Other prominent national civil codes include the French Napoleonic Code, the Austrian Civil Code, the German Civil Code, and the Swiss Codes.
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Frequently asked questions
Common law, also known as case law, relies on detailed records of similar situations and statutes as there is no official legal code that can be applied to a case. It draws from institutionalized opinions and interpretations from judicial authorities and public juries.
Code law, also known as civil law, is a comprehensive, codified set of legal statutes created by legislators. It clearly defines the cases that can be brought to court, the procedures for handling claims, and the punishment for an offense.
No, they are not the same thing. Code law and common law are two different systems of law.
Common law originated in medieval England and is practiced in common law countries such as the US and UK, which operate under a dual system of both common and civil law. 49 states and DC in the US are common law jurisdictions.
Common law emphasizes precedent while allowing some freedom for interpretation. Code law, on the other hand, aims to create order and reduce bias by applying standardized codes to ensure consistent outcomes.





















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