A unitary authority is a type of local authority, which has a single-tier and is responsible for all local government functions within its area. This is opposed to a two-tier system where local government functions are divided between different authorities.
Typically unitary authorities cover large towns or cities, which are large enough to be independent of county or regional administration. Or sometimes they consist of counties which have no lower level of administration.
More commonly referred to as single-tier municipalities, they exist as a single level of government in a province that otherwise has two levels of local government. One should not confuse municipalities in provinces with no upper-level of local government as single-tier municipalities, as these are the only level of local government in that province.
Structure of a single-tier municipality varies, and while most function as cities with no upper level of government, some function as counties or regional municipalities with no lower municipal subdivisons below them. The vast majority of Canadian single-tier municipalities are located in Ontario, where they exist as individual census divisions, as well as separated municipalities.
In New Zealand a unitary authority is a territorial authority (district or city) which also performs the functions of a regional council. New Zealand has four unitary authorities: Gisborne District, Nelson City, Tasman District and Marlborough District. The Chatham Islands Council is not usually considered a unitary authority, although it acts as a regional council for the purposes of the Resource Management Act.
In the United Kingdom, two systems of local government exist. Throughout most of England, a two-tier system exists, with county councils and districts sharing local government responsibillities.
However many cities and large towns are now administered as unitary authorities, with the local council responsible for running all local services, combining both county and district functions.
In some small English counties such as Rutland and Herefordshire, the county council is a unitary authority without any districts.
The whole of Scotland and Wales is now governed by a unitary system.
The term 'unitary authority' itself first surfaced in the Redcliffe-Maud Report, to describe the sort of authority the report recommended cover most of England. These sorts of authorities already existed and were called county boroughs; but the term was urban in character. The Report was rejected by the incoming government after the 1970 general election, and county boroughs were abolished in 1974. It was not until the 1990s that unitary authorities would be created in the UK.
In practice most unitary authorities in the UK are not entirely unitary, as they often run some services on a joint basis with other authorities, these typically include policing, fire services. and sometimes public transport.
Creation of unitary authorities
Unitary authorities can be created by statutory instruments, so do not require separate legislation, under the terms of the Local Government Act 1992 . Typically a district of an administrative county is designated as a new administrative county, but without a county council. The borders of the original county are adjusted to exclude the unitary authority area. In common usage unitary authority areas are not usually referred to as counties, although there are exceptions such as the Herefordshire and Rutland, which are reinstatements of counties lost in the 1974 reorganisation; and the Isle of Wight, (the first Unitary Authority created after the 1992 Act, and arguably one of the simplest and least controversial to create) which was, and remains, a separate county, but now with only a single council.
In some cases, such as the boroughs of metropolitan counties and Berkshire a different process was followed, where the county council was abolished, and its functions merely transferred to the districts.
Scotland and Wales consistently use unitary authorities. They have been becoming common in England since the 1990s. However the two-tier arrangement (increasing to three-tiers, for the remaining county administrations) has remained in a different form due to the introduction of a regional level of administration.
London boroughs (including the City of London), the Isles of Scilly, are also counted as unitary authorities.
Listings of unitary authorities in England can be found by region, or in Subdivisions of England.
In the United States an Independent city is roughly equivlent to a unitary authority.