required by

USAGE SUMMARY

"required by" is correct and usable in written English.
You can use it in the context of something being legally mandated or factually necessary. For example: "The new building regulations are required by law."

✓ Grammatically correct

News & Media

Science

Formal & Business

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

But these requirements are not required by law.

The Guardian

Booking required by 5pm.

The Guardian - Travel

They are required by justice.

The New Yorker

Whistle-blowing is required by law.

The New Yorker

Reservations are required by Monday.

The New York Times

Registration is required by Wednesday.

The New York Times

Reservations are required, by calling.

The New York Times

Such disclosures are required by the Campaign Finance Board.

The New York Times

The move is required by law.

The New York Times

I thought it was required by law.

The New Yorker

Reservations are required by April 24.

The New York Times

Expert writing Tips

Best practice

Use "required by" when indicating that a specific rule, law, or standard mandates an action or condition. Be precise about what is doing the requiring to maintain clarity.

Common error

Avoid omitting the "by" when using "required". Saying something is "required law" is grammatically incorrect; always specify "required by law" or a similar structure to show the source of the requirement.

Linguistic Context

The phrase "required by" functions as a prepositional phrase modifying a verb or noun, indicating that something is made necessary or obligatory by a specific agent, rule, or condition. Ludwig's examples showcase its use in legal, regulatory, and practical contexts.

Expression frequency: Very common

Frequent in

News & Media

40%

Science

30%

Formal & Business

15%

Less common in

Encyclopedias

5%

Wiki

5%

Reference

5%

Ludwig's WRAP-UP

In summary, the phrase "required by" is a common and grammatically correct way to indicate that something is obligatory due to a rule, law, or condition. As shown by Ludwig, its usage spans across various contexts, including legal, scientific, and general informational settings. It is most frequently found in news and media outlets. Ludwig AI confirms that the phrase is grammatically sound and widely used. When using this phrase, ensure that you clearly specify what is imposing the requirement to maintain clarity. It's best to avoid omitting the "by" because "require by" is grammatically incorrect.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

mandated by

Emphasizes a formal or legal obligation, suggesting an official command or decree.

stipulated by

Highlights a specific condition or term within an agreement or rule.

necessitated by

Focuses on the cause or reason making something necessary, highlighting the conditions that demand it.

dictated by

Implies a strong controlling force or authority that determines the need.

determined by

Suggests that a specific factor or entity is the deciding element of a requirement.

governed by

Indicates that a set of rules or principles is in control of what's needed.

prescribed by

Highlights a specific instruction or recommendation that needs to be followed.

conditional on

Focuses on the idea that something is necessary as a prerequisite or condition.

dependent on

Emphasizes reliance on something else for a requirement to be met.

contingent upon

Similar to 'dependent on' but highlights a possible future event or condition.

FAQs

How do I use "required by" in a sentence?

Use "required by" to indicate that something is necessitated or mandated by a specific entity, such as "This action is required by law" or "The changes are required by the new regulations".

What phrases can I use instead of "required by"?

Alternatives include "mandated by", "stipulated by", "necessitated by", or "dictated by", depending on the context and the nature of the requirement.

Is it correct to say "require by" instead of "required by"?

No, "require by" is not grammatically correct. The past participle form "required" is needed to indicate that the requirement is imposed by something. The correct phrase is "required by".

What is the difference between "required by law" and "required under the law"?

"Required by law" indicates a direct mandate from the law, while "required under the law" suggests compliance with a specific provision or regulation within the legal framework. They are often interchangeable but "required by law" is more direct.