[309] Mr. Justice White
delivered the opinion of the Court.
Section 8 (a) of the Occupational Safety and Health Act of 1970 (OSHA or Act) 1 empowers agents of the Secretary of Labor (Secretary) to search the work area of any employment facility within the Act’s jurisdiction. The purpose of the search is to inspect for safety hazards and violations of OSHA regulations. No search warrant or other process is expressly required under the Act.
On the morning of September 11, 1975, an OSHA inspector entered the customer service area of Barlow’s, Inc., an electrical and plumbing installation business located in Pocatello, Idaho. The president and general manager, Ferrol G. “Bill” Barlow, was on hand; and the OSHA inspector, after showing his credentials,2 informed Mr. Barlow that he wished to con[310] duct a search of the working areas of the business. Mr. Barlow inquired whether any complaint had been received about his company. The inspector answered no, but that Barlow’s, Inc., had simply turned up in the agency’s selection process. The inspector again asked to enter the nonpublic area of the business; Mr. Barlow’s response was to inquire whether the inspector had a search warrant. The inspector had none. Thereupon, Mr. Barlow refused the inspector admission to the employee area of his business. He said he was relying on his rights as guaranteed by the Fourth Amendment of the United States Constitution.
Three months later, the Secretary petitioned the United States District Court for the District of Idaho to issue an order compelling Mr. Barlow to admit the inspector.3 The requested order was issued on December 30, 1975, and was presented to Mr. Barlow on January 5, 1976. Mr. Barlow again refused admission, and he sought his own injunctive relief against the warrantless searches assertedly permitted by OSHA. A three-judge court was convened. On December 30, 1976, it ruled in Mr. Barlow’s favor. 424 F. Supp. 437. Concluding that Camara v. Municipal Court, 387 U. S. 523, 528-529 (1967), and See v. Seattle, 387 U. S. 541, 543 (1967), controlled this case, the court held that the Fourth Amendment required a warrant for the type of search involved here4 and that the statutory authorization for warrantless inspections was unconstitutional. An injunction against searches or inspections pursuant to § 8 (a) was entered. The Secretary appealed, challenging the judgment, and we noted probable jurisdiction. 430 U. S. 964.
[311] I
The Secretary urges that warrantless inspections to enforce' OSHA are reasonable within the meaning of the Fourth Amendment. Among other things, he relies on § 8 (a) of the Act, 29 U. S. C. § 657 (a), which authorizes inspection of business premises without a warrant and which the Secretary urges represents a congressional construction of the Fourth Amendment that the courts should not reject. Regrettably, we are unable to agree.
The Warrant Clause of the Fourth Amendment protects commercial buildings as well as private homes. To hold otherwise would belie the origin of that Amendment, and the American colonial experience. An important forerunner of the first 10 Amendments to the United States Constitution, the Virginia Rill of Rights, specifically opposed “general warrants, whereby an officer or messenger may be commanded to search suspected places without evidence of a fact committed.” 5 The general warrant was a recurring point of contention in the Colonies immediately preceding the Revolution.6 The particular offensiveness it engendered was acutely felt by the merchants and businessmen whose premises and products were inspected for compliance with the several parliamentary revenue measures that most irritated the colonists.7 “•[T]he Fourth Amendment’s commands grew in large measure out of the colonists’ experience with the writs of assistance . . . [that] granted sweeping power to customs officials and other agents of the King to search at large for smuggled goods.” United States v. Chadwick, 433 U. S. 1, 7-8 (1977). [312] See also G. M. Leasing Corp. v. United States, 429 U. S. 338, 355 (1977). Against this background, it is untenable that the ban on warrantless searches was not intended to shield places of business as well as of residence.
This Court has already held that warrantless searches are generally unreasonable, and that this rule applies to commercial premises as well as homes. In Camara v. Municipal Court, supra, at 528-529, we held:
“[E]xcept in certain carefully defined classes of cases, a search of private property without proper consent is 'unreasonable' unless it has been authorized by a valid search warrant.”
On the same day, we also ruled:
“As we explained in Camara, a search of private houses is presumptively unreasonable if conducted without a warrant. The businessman, like the occupant of a residence, has a constitutional right to go about his business free from unreasonable official entries upon his private commercial property. The businessman, too, has that right placed in jeopardy if the decision to enter and inspect for violation of regulatory laws can be made and enforced by the inspector in the field without official authority evidenced by a warrant.” See v. Seattle, supra, at 543.
These same cases also held that the Fourth Amendment prohibition against unreasonable searches protects against warrantless intrusions during civil as well as criminal investigations. Ibid. The reason is found in the “basic purpose of this Amendment . . . [which] is to safeguard the privacy and security of individuals against arbitrary invasions by governmental officials.” Camara, supra, at 528. If the government intrudes on a person’s property, the privacy interest suffers whether the government’s motivation is to investigate violations of criminal laws or breaches of other statutory or [313] regulatory standards. It therefore appears that unless some recognized exception to the warrant requirement applies, See v. Seattle would require a warrant to conduct the inspection sought in this case.
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[309] Mr. Justice White
delivered the opinion of the Court.
Section 8 (a) of the Occupational Safety and Health Act of 1970 (OSHA or Act) 1 empowers agents of the Secretary of Labor (Secretary) to search the work area of any employment facility within the Act’s jurisdiction. The purpose of the search is to inspect for safety hazards and violations of OSHA regulations. No search warrant or other process is expressly required under the Act.
On the morning of September 11, 1975, an OSHA inspector entered the customer service area of Barlow’s, Inc., an electrical and plumbing installation business located in Pocatello, Idaho. The president and general manager, Ferrol G. “Bill” Barlow, was on hand; and the OSHA inspector, after showing his credentials,2 informed Mr. Barlow that he wished to con[310] duct a search of the working areas of the business. Mr. Barlow inquired whether any complaint had been received about his company. The inspector answered no, but that Barlow’s, Inc., had simply turned up in the agency’s selection process. The inspector again asked to enter the nonpublic area of the business; Mr. Barlow’s response was to inquire whether the inspector had a search warrant. The inspector had none. Thereupon, Mr. Barlow refused the inspector admission to the employee area of his business. He said he was relying on his rights as guaranteed by the Fourth Amendment of the United States Constitution.
Three months later, the Secretary petitioned the United States District Court for the District of Idaho to issue an order compelling Mr. Barlow to admit the inspector.3 The requested order was issued on December 30, 1975, and was presented to Mr. Barlow on January 5, 1976. Mr. Barlow again refused admission, and he sought his own injunctive relief against the warrantless searches assertedly permitted by OSHA. A three-judge court was convened. On December 30, 1976, it ruled in Mr. Barlow’s favor. 424 F. Supp. 437. Concluding that Camara v. Municipal Court, 387 U. S. 523, 528-529 (1967), and See v. Seattle, 387 U. S. 541, 543 (1967), controlled this case, the court held that the Fourth Amendment required a warrant for the type of search involved here4 and that the statutory authorization for warrantless inspections was unconstitutional. An injunction against searches or inspections pursuant to § 8 (a) was entered. The Secretary appealed, challenging the judgment, and we noted probable jurisdiction. 430 U. S. 964.
[311] I
The Secretary urges that warrantless inspections to enforce' OSHA are reasonable within the meaning of the Fourth Amendment. Among other things, he relies on § 8 (a) of the Act, 29 U. S. C. § 657 (a), which authorizes inspection of business premises without a warrant and which the Secretary urges represents a congressional construction of the Fourth Amendment that the courts should not reject. Regrettably, we are unable to agree.
The Warrant Clause of the Fourth Amendment protects commercial buildings as well as private homes. To hold otherwise would belie the origin of that Amendment, and the American colonial experience. An important forerunner of the first 10 Amendments to the United States Constitution, the Virginia Rill of Rights, specifically opposed “general warrants, whereby an officer or messenger may be commanded to search suspected places without evidence of a fact committed.” 5 The general warrant was a recurring point of contention in the Colonies immediately preceding the Revolution.6 The particular offensiveness it engendered was acutely felt by the merchants and businessmen whose premises and products were inspected for compliance with the several parliamentary revenue measures that most irritated the colonists.7 “•[T]he Fourth Amendment’s commands grew in large measure out of the colonists’ experience with the writs of assistance . . . [that] granted sweeping power to customs officials and other agents of the King to search at large for smuggled goods.” United States v. Chadwick, 433 U. S. 1, 7-8 (1977). [312] See also G. M. Leasing Corp. v. United States, 429 U. S. 338, 355 (1977). Against this background, it is untenable that the ban on warrantless searches was not intended to shield places of business as well as of residence.
This Court has already held that warrantless searches are generally unreasonable, and that this rule applies to commercial premises as well as homes. In Camara v. Municipal Court, supra, at 528-529, we held:
“[E]xcept in certain carefully defined classes of cases, a search of private property without proper consent is 'unreasonable' unless it has been authorized by a valid search warrant.”
On the same day, we also ruled:
“As we explained in Camara, a search of private houses is presumptively unreasonable if conducted without a warrant. The businessman, like the occupant of a residence, has a constitutional right to go about his business free from unreasonable official entries upon his private commercial property. The businessman, too, has that right placed in jeopardy if the decision to enter and inspect for violation of regulatory laws can be made and enforced by the inspector in the field without official authority evidenced by a warrant.” See v. Seattle, supra, at 543.
These same cases also held that the Fourth Amendment prohibition against unreasonable searches protects against warrantless intrusions during civil as well as criminal investigations. Ibid. The reason is found in the “basic purpose of this Amendment . . . [which] is to safeguard the privacy and security of individuals against arbitrary invasions by governmental officials.” Camara, supra, at 528. If the government intrudes on a person’s property, the privacy interest suffers whether the government’s motivation is to investigate violations of criminal laws or breaches of other statutory or [313] regulatory standards. It therefore appears that unless some recognized exception to the warrant requirement applies, See v. Seattle would require a warrant to conduct the inspection sought in this case.
The Secretary urges that an exception from the search warrant requirement has been recognized for “pervasively regulated businesses],” United States v. Biswell, 406 U. S. 311, 316 (1972), and for “closely regulated” industries “long subject to close supervision and inspection.” Colonnade Catering Corp. v. United States, 397 U. S. 72, 74, 77 (1970). These cases are indeed exceptions, but they represent responses to relatively unique circumstances. Certain industries have such a history of government oversight that no reasonable expectation of privacy, see Katz v. United States, 389 U. S. 347, 351-352 (1967), could exist for a proprietor over the stock of such an enterprise. Liquor (Colonnade) and firearms (Biswell) are industries of this type; when an entrepreneur embarks upon such a business, he has voluntarily chosen to subject himself to a full arsenal of governmental regulation.
Industries such as these fall within the “certain carefully defined classes of cases,” referenced in Camara, 387 U. S., at 528. The element that distinguishes these enterprises from ordinary businesses is a long tradition of close government supervision, of which any person who chooses to enter such a business must already be aware. “A central difference between those cases [Colonnade and Biswell] and this one is that businessmen engaged in such federally licensed and regulated enterprises accept the burdens as well as the benefits of their trade, whereas the petitioner here was not engaged in any regulated or licensed business. The businessman in a regulated industry in effect consents to the restrictions placed upon him.” Almeida-Sanchez v. United States, 413 U. S. 266, 271 (1973).
The clear import of our cases is that the closely regulated industry of the type involved in Colonnade and Biswell is the exception. The Secretary would make it the rule. Invoking [314] the Walsh-Healey Act of 1936, 41 U. S. C. § 35 et seq., the Secretary attempts to support a conclusion that all businesses involved in interstate commerce have long been subjected to close supervision of employee safety and health conditions. But the degree of federal involvement in employee working circumstances has never been of the order of specificity and pervasiveness that OSHA mandates. It is quite unconvincing to argue that the imposition of minimum wages and maximum hours on employers who contracted with the Government under the Walsh-Healey Act prepared the entirety of American interstate commerce for regulation of working conditions to the minutest detail. Nor can any but the most fictional sense of voluntary consent to later searches be found in the single fact that one conducts a business affecting interstate commerce; under current practice and law, few businesses can be conducted without having some effect on interstate commerce.
The Secretary also attempts to derive support for a Colonnade-Biswell-type exception by drawing analogies from the field of labor law. In Republic Aviation Corp. v. NLRB, 324 U. S. 793 (1945), this Court upheld the rights of employees to solicit for a union during nonworking time where efficiency was not compromised. By opening up his property to employees, the employer had yielded so much of his private property rights as to allow those employees to exercise § 7 rights under the National Labor Relations Act. But this Court also held that the private property rights of an owner prevailed over the intrusion of nonemployee organizers, even in nonworking areas of the plant and during nonworking hours. NLRB v. Babcock & Wilcox Co., 351 U. S. 105 (1956).
The critical fact in this case is that entry over Mr. Barlow’s objection is being sought by a Government agent.8 Employees [315] are not being prohibited from reporting OSHA violations. What they observe in their daily functions is undoubtedly beyond the employer’s reasonable expectation of privacy. The Government inspector, however, is not an employee. Without a warrant he stands in no better position than a member of the public. What is observable by the public is observable, without a warrant, by the Government inspector as well.9 The owner of a business has not, by the necessary utilization of employees in his operation, thrown open the areas where employees alone are permitted to the warrantless scrutiny of Government agents. That an employee is free to report, and the Government is free to use, any evidence of noncompliance with OSHA that the employee observes furnishes no justification for federal agents to enter a place of business from which the public is restricted and to conduct their own warrantless search.10
II
The Secretary nevertheless stoutly argues that the enforcement scheme of the Act requires warrantless searches, and that the restrictions on search discretion contained in the Act and its regulations already protect as much privacy as a warrant would. The Secretary thereby asserts the actual reasonableness of OSHA searches, whatever the general rule against warrantless searches might be. Because “reasonableness is still the ultimate standard,” Camara v. Municipal [316] Court, 387 U. S., at 539, the Secretary suggests that the Court decide whether a warrant is needed by arriving at a sensible balance between the administrative necessities of OSHA inspections and the incremental protection of privacy of business owners a warrant would afford. He suggests that only a decision exempting OSHA inspections from the Warrant Clause would give “full recognition to the competing public and private interests here at stake.” Ibid.
The Secretary submits that warrantless inspections are essential to the proper enforcement of OSHA because they afford the opportunity to inspect without prior notice and hence to preserve the advantages of surprise. While the dangerous conditions outlawed by the Act include structural defects that cannot be quickly hidden or remedied, the Act also regulates a myriad of safety details that may be amenable to speedy alteration or disguise. The risk is that during the interval between an inspector’s initial request to search a plant and his procuring a warrant following the owner’s refusal of permission, violations of this latter type could be corrected and thus escape the inspector’s notice. To the suggestion that warrants may be issued ex parte and executed without delay and without prior notice, thereby preserving the element of surprise, the Secretary expresses concern for the administrative strain that would be experienced by the inspection system, and by the courts, should ex parte warrants issued in advance become standard practice.
We are unconvinced, however, that requiring warrants to inspect will impose serious burdens on the inspection system or the courts, will prevent inspections necessary to enforce the statute, or will make them less effective. In the first place, the great majority of businessmen can be expected in normal course to consent to inspection without warrant; the Secretary has not brought to this Court’s attention any widespread pattern of refusal.11 In those cases where an owner does insist [317] on a warrant, the Secretary argues that inspection efficiency will be impeded by the advance notice and delay. The Act’s penalty provisions for giving advance notice of a search, 29 U. S. C. § 666 (f), and the Secretary’s own regulations, 29 CFR § 1903.6 (1977), indicate that surprise searches are indeed contemplated. However, the Secretary has also promulgated a regulation providing that upon refusal to permit an inspector to enter the property or to complete his inspection, the inspector shall attempt to ascertain the reasons for the refusal and report to his superior, who shall “promptly take appropriate action, including compulsory process, if necessary.” 29 CFR § 1903.4 (1977).12 The regulation represents a choice to pro[318] ceed by process where entry is refused; and on the basis of evidence available from present practice, the Act’s effectiveness has not been crippled by providing those owners who wish to refuse an initial requested entry with a time lapse while the inspector obtains the necessary process.13 Indeed, the kind of process sought in this case and apparently anticipated by the regulation provides notice to the business operator.14 [319] If this safeguard endangers the efficient administration of OSHA, the Secretary should never have adopted it, particularly when the Act does not require it. Nor is it immediately [320] apparent why the advantages of surprise would be lost if, after being refused entry, procedures were available for the Secretary to seek an ex parte warrant and to reappear at the premises without further notice to the establishment being inspected.15
Whether the Secretary proceeds to secure a warrant or other process, with or without prior notice, his entitlement to inspect will not depend on his demonstrating probable cause to believe that conditions in violation of OSHA exist on the premises. Probable cause in the criminal law sense is not required. For purposes of an administrative search such as this, probable cause justifying the issuance of a warrant may be based not only on specific evidence of an existing violation16 but also on a showing that “reasonable legislative or administrative standards for conducting an . . . inspection are satisfied with respect to a particular [establishment].” Camara [321] v. Municipal Court, 387 U. S., at 538. A warrant showing that a specific business has been chosen for an OSHA search on the basis of a general administrative plan for the enforcement of the Act derived from neutral sources such as, for example, dispersion of employees in various types of industries across a given area, and the desired frequency of searches in any of the lesser divisions of the area, would protect an employer’s Fourth Amendment rights.17 We doubt that the consumption of enforcement energies in the obtaining of such warrants will exceed manageable proportions.
Finally, the Secretary urges that requiring a warrant for OSHA inspectors will mean that, as a practical matter, war-rantless-search provisions in other regulatory statutes are also constitutionally infirm. The reasonableness of a warrantless search, however, will depend upon the specific enforcement needs and privacy guarantees of each statute. Some of the statutes cited apply only to a single industry, where regulations might already be so pervasive that a Colonnade-Biswell exception to the warrant requirement could apply. Some statutes already envision resort to federal-court enforcement when entry is refused, employing specific language in some cases 18 and general language in others.19 In short, we base [322] today’s opinion on the facts and law concerned with OSHA and do not retreat from a holding appropriate to that statute because of its real or imagined effect on other, different administrative schemes.
Nor do we agree that the incremental protections afforded the employer’s privacy by a warrant are so marginal that they fail to justify the administrative burdens that may be entailed. [323] The authority to make warrantless searches devolves almost unbridled discretion upon executive and administrative officers, particularly those in the field, as to when to search and whom to search. A warrant, by contrast, would provide assurances from a neutral officer that the inspection is reasonable under the Constitution, is authorized by statute, and is pursuant to an administrative plan containing specific neutral criteria.20 Also, a warrant would then and there advise the owner of the scope and objects of the search, beyond which limits the inspector is not expected to proceed.21 These are important functions for a warrant to perform, functions which underlie the Court’s prior decisions that the Warrant Clause applies to [324] inspections for compliance with regulatory statutes.22 Camara v. Municipal Court, 387 U. S. 523 (1967); See v. Seattle, 387 U. S. 541 (1967). We conclude that the concerns expressed by the Secretary do not suffice to justify warrantless inspections under OSHA or vitiate the general constitutional requirement that for a search to be reasonable a warrant must be obtained.
[325] III
We hold that Barlow’s was entitled to a declaratory judgment that the Act is unconstitutional insofar as it purports to authorize inspections without warrant or its equivalent and to an injunction enjoining the Act’s enforcement to that extent.23 The judgment of the District Court is therefore affirmed.
So ordered.
Mr. Justice Brennan took no part in the consideration or decision of this case.
“Upon a refusal to permit a Compliance Safety and Health Officer, in the exercise of his official duties, to enter without delay and at reasonable times any place of employment or any place therein, to inspect, to review records, or to question any employer, owner, operator, agent, or employee, in accordance with § 1903.3, or to permit a representative of employees to accompany the Compliance Safety and Health Officer during the physical inspection of any workplace in accordance with § 1903.8, the Compliance Safety and Health Officer shall terminate the inspection or confine the inspection to other areas, conditions, structures, machines, apparatus, devices, equipment, materials, records, or interviews concerning which no objection is raised. The Compliance Safety and Health Officer shall endeavor to ascertain the reason for such refusal, and he shall immediately report the refusal and the reason therefor to the Area Director. The Area Director shall immediately consult with the Assistant Regional Direc[318] tor and the Regional Solicitor, who shall promptly take appropriate action, including compulsory process, if necessary.”
When his representative was refused admission by Mr. Barlow, the Secretary proceeded in federal court to enforce his right to enter and inspect, as conferred by 29 U. S. C. § 657.
The latest available manual, incorporating changes as of November 1977, deletes this provision, leaving only the details for obtaining “compulsory process” after an employer has refused entry. Dept. of Labor, OSHA Field Operations Manual, Vol. V, pp. V—4-V-5. In its present form, the Secretary’s regulation appears to permit establishment owners to insist on “process”; and hence their refusal to permit entry would fall short of criminal conduct within the meaning of 18 U. S. C. §§ 111 and 1114 (1976 ed.), which make it a crime forcibly to impede, intimidate, or interfere with federal officials, including OSHA inspectors, while engaged in or on account of the performance of their official duties.
“IT IS HEREBY ORDERED, ADJUDGED AND DECREED that the United States of America, United States Department of Labor, Occupational Safety and Health Administration, through its duly designated representative or representatives, are entitled to entry upon the premises known as Barlow’s Inc., 225 West Pine, Pocatello, Idaho, and may go upon said business premises to conduct an inspection and investigation as provided for in Section 8 of the Occupational Safety and Health Act of 1970 (29 U. S. C. 651, et seq.), as part of an inspection program designed to assure compliance with that Act; that the inspection and investigation shall be conducted during regular working hours or at other reasonable times, within reasonable limits and in a reasonable manner, all as set forth in the regulations pertaining to such inspections promulgated by the Secretary of Labor, at 29 C. F. R., Part 1903; that appropriate credentials as representatives of the Occupational Safety and Health Administration, United States Department of Labor, shall be presented to the Barlow’s Inc. representative upon said premises and the inspection and investigation shall be commenced as soon as practicable after the issuance of this Order and shall be completed within reasonable promptness; that the inspection and investigation shall extend to the establishment or other area, workplace, or environment where work is performed by employees of the employer, Barlow’s Inc., and to all pertinent conditions, structures, machines, apparatus, devices, equipment, materials, and all other things therein (including but n,ot limited to records, files, papers, processes, controls, and facilities) bearing upon whether Barlow’s Inc. is furnishing to its employees employment and a place of employment that are free from recognized hazards that are causing or are likely to cause death or serious physical harm to> its employees, and whether Barlow’s Inc. is complying with the Occupational Safety and Health Standards promulgated under the Occupational Safety and Health Act and the rules, regulations, and orders issued pursuant to that Act; that representatives of the Occupational Safety and Health Administration may, at the option of Barlow’s Inc., be accompanied by one or more employees of Barlow’s Inc., pursuant to Section 8 (e) of that Act; that Barlow’s Inc., its agents, representatives, [320] officers, and employees are hereby enjoined and restrained from in anyway whatsoever interfering with the inspection and investigation authorized by this Order and, further, Barlow’s Inc. is hereby ordered and directed to, within five working days from the date of this Order, furnish a copy of this Order to its officers and managers, and, in addition, to post a copy of this Order at its employee’s bulletin board located upon the business premises; and Barlow’s Inc. is hereby ordered and directed to comply in all respects with this order and allow the inspection and investigation to take place without delay and forthwith.”
In describing the scope of the warrantless inspection authorized by the statute, § 8 (a) does not expressly include any records among those items or things that may be examined, and § 8 (c) merely provides that the employer is to “make available” his pertinent records and to make periodic reports.
The Secretary’s regulation, 29 CFR § 1903.3 (1977), however, expressly includes among the inspector’s powers the authority “to review records required by the Act and regulations published in this chapter, and other records which are directly related to the purpose of the inspection.” Further, § 1903.7 requires inspectors to indicate generally “the records specified in § 1903.3 which they wish to review” but “such designations of records shall not preclude access to additional records specified in § 1903.3.” It is the Secretary’s position, which we reject, that an inspection of documents of this scope may be effected without a warrant.
The order that issued in this case included among the objects and things to be inspected “all other things therein (including but not limited to records, files, papers, processes, controls and facilities) bearing upon whether Barlow’s, Inc. is furnishing to its employees employment and a place of employment that are free from recognized hazards that are causing or are likely to cause death or serious physical harm to its employees, and whether Barlow’s, Inc. is complying with . . the OSHA regulations.