Longman Dictionary of Contemporary English
Wikipedia
In the United Kingdom, the term conservation area nearly always applies to an area (usually urban or the core of a village) considered worthy of preservation or enhancement because of its special architectural or historic interest.
The current legislation in England and Wales, the Planning (Listed Buildings and Conservation Areas) Act 1990 (Section 69 and 70), defines the quality of a conservation area as being: "the character or appearance of which it is desirable to preserve or enhance". The current Scottish legislation is the Planning (Listed Buildings and Conservation Areas) (Scotland) Act 1997.
More than 9,600 have been designated in England.
The Civic Amenities Act 1967 introduced the concept of conservation areas before being superseded by the 1990 Act. Stamford, Lincolnshire was the first conservation area to be designated.
Usage examples of "conservation area".
I don't know if the old shack is still standing in Conservation Area 1B, but the eastward view certainly isn't the same.
In 1992, a development company in Reading tore down five listed buildings in a conservation area, was taken to court and fined all of £.
The scientific finds and increased understanding of this absolutely untouched region led the government of Malaysia to propose the region as a conservation area.
Down on St Peter's Street all the electricity cables were buried in accordance with the rules for a Grade 2 conservation area.
It's a conservation area, no satellite dishes or anything modern and vulgar, so they can pretend they're in any era they like.