Construction Permits for Radio Broadcast Stations

A construction permit (CP) is the formal Federal Communications Commission authorization that allows a broadcast station to build new facilities or make specified technical changes before a license can be issued or modified. Without a valid CP, erecting a new tower, installing transmitters, or relocating a broadcast facility violates FCC rules regardless of whether the station already holds an operating license. This page covers the definition and regulatory scope of construction permits, the procedural mechanics of obtaining one, the scenarios in which a CP is required, and the decision boundaries that determine which authorization pathway applies.

Definition and scope

A construction permit is defined under 47 C.F.R. Part 73 as the FCC authorization that must be obtained before constructing a new broadcast station or making specified changes to an existing station's facilities. The permit specifies the technical parameters the station is authorized to build to — including transmitter power, antenna height, tower coordinates, and radiation pattern — and sets a deadline by which construction must be completed and a license application filed.

The scope of CP requirements extends across all commercial and noncommercial AM, FM, and full-power TV broadcast services. Low-power FM (LPFM) stations are also subject to CP requirements, governed by 47 C.F.R. §73.855. The FCC's Media Bureau administers all broadcast construction permits through its Licensing and Management System (LMS), which replaced the legacy CDBS database as the primary filing platform.

The statutory authority for broadcast permitting derives from the Communications Act of 1934, specifically Section 319, which prohibits the construction of a broadcast station except under and in accordance with a permit issued by the Commission (47 U.S.C. §319).

How it works

The construction permit process follows a discrete sequence of phases:

Application filing — The applicant submits FCC Form 301 (commercial stations) or FCC Form 340 (noncommercial educational stations) through the LMS portal, specifying proposed technical parameters and demonstrating that the proposed facility will not cause prohibited interference with existing stations.
Frequency coordination and engineering analysis — For FM stations, propagation studies must demonstrate compliance with minimum distance separation requirements set out in 47 C.F.R. §73.207. AM applications require ground conductivity and antenna pattern analysis. The FCC uses contour prediction tools to assess interference.
Public notice and petition window — Once the application is accepted, the FCC places it on public notice. Third parties have 30 days to file petitions to deny or informal objections, as provided under 47 C.F.R. §73.3584.
Grant and permit issuance — If no disqualifying objections exist, the FCC grants the CP. The permit document specifies all authorized technical parameters and the construction deadline.
Construction and compliance — The permittee constructs the facilities as authorized. Deviations from permitted parameters — such as a tower located more than 3 seconds of latitude or longitude from the authorized coordinates — require a modification application before construction proceeds.
License application — Upon completion of construction and successful testing, the permittee files FCC Form 302 (commercial) or FCC Form 341 (NCE) to convert the CP into a station license.

The standard CP term for commercial FM and AM stations is 3 years from the date of grant (47 C.F.R. §73.3598). Permittees who cannot complete construction within the authorized term may file for a tolling of the construction deadline under specific circumstances — including delays caused by administrative or judicial proceedings, or natural disasters — though tolling is not automatic and requires a formal showing.

The broader regulatory context for radio broadcast explains how CP requirements fit within the FCC's overall framework for spectrum management and public interest obligations.

Common scenarios

New station construction — The most straightforward CP scenario occurs when a new broadcast station is authorized through an FCC auction or a comparative hearing. The winning applicant receives a CP and must complete construction and begin operations within the 3-year window. Failure to construct results in automatic permit expiration and forfeiture of the authorization.

Major facility changes — An existing licensed station that wishes to increase its effective radiated power, move its transmitter site by more than a minor threshold, or change its antenna height above average terrain (HAAT) by more than a specified amount must apply for a new or modified CP before making those changes. Major versus minor change thresholds for FM stations are defined in 47 C.F.R. §73.3573.

Translator and booster modifications — FM translator stations (secondary service stations that rebroadcast a primary station's signal) require their own CPs for new construction or changes. FM translators are governed under 47 C.F.R. Part 74, Subpart L.

Silent station reactivation — A licensed station that has been silent for more than 12 consecutive months faces automatic license cancellation under FCC rules. Returning such a station to the air requires demonstrating that the previously authorized facilities remain intact; if modifications are needed, a CP is required.

Auction-derived permits — Since 1997, the FCC has used competitive bidding to assign new broadcast licenses where mutually exclusive applications exist. The winning bidder receives a CP, not an immediate license. The CP reflects the technical proposal submitted in the application and cannot be substantially modified post-auction without a separate filing.

Decision boundaries

The central distinction in broadcast permitting is between major changes and minor changes, which determines whether a full CP application or a minor modification filing is required.

Parameter	Minor Change (no new CP required)	Major Change (new CP required)
FM transmitter site relocation	Within 5.6 km in most cases	Beyond 5.6 km
FM antenna HAAT change	10 meters or less	More than 10 meters
FM power increase	Within existing class limits, no new interference	Increase beyond class maximum or causes new interference
AM transmitter site	Within 3 seconds of lat/long	Beyond 3 seconds or changes radiation pattern

Source: 47 C.F.R. §73.3573 (FM) and 47 C.F.R. §73.3571 (AM).

A second critical boundary involves priority and protection. A station operating under a granted CP has a different protection status than a fully licensed station. Under 47 C.F.R. §73.3572, a CP holder is entitled to interference protection from subsequently filed applications but is not entitled to the same degree of protection as a licensed station in all interference scenarios. This distinction matters when a licensee considers filing a new CP that could conflict with a pending competing application.

The radio broadcast spectrum and frequency allocation framework provides the technical basis for how these protection calculations are performed. For a broader overview of licensing instruments across the broadcast regulatory structure, the site index organizes all reference topics by subject area.