As the global human population has increased, and people have moved from rural to urban communities, so towns and cities have expanded, spreading along roads in ribbon developments and through the creation of low-density suburbs surrounding older, inner neighbourhoods.
It has long been recognised that it can be beneficial to control this urban sprawl:
The notion of a ‘green belt’ was first mooted in 1580, when Elizabeth I established a three-mile wide cordon sanitaire around London, prohibiting housing development where there had not been a building in living memory. By all accounts this proclamation was widely ignored.
In January 1914, Aston Webb, architect of the Victoria and Albert Museum and the facade of Buckingham Palace, told his peers at the London Society that he foresaw, in the year 2014, “a beautiful sylvan line practically around all London.” He named it the ‘green belt’, an improvement on its original working-title, the ‘green girdle.’
In 1938, the Green Belt (London and Home Counties) Act enabled local authorities to purchase and protect land from development, creating a green belt around London. The Act also allowed landowners to enter into covenants protecting their own land as part of the green belt.
The green belt was subsequently sanctioned in Patrick Abercrombie’s Greater London Plan (1944) and established in the Town and Country Planning Act in 1947, designed to hold in check urban sprawl and protect the countryside from increasing urbanisation.
In 1955, the Ministry of Housing and Local Government requested that, where appropriate, all local authorities should include green belts in their plans.
Green Belts establish a buffer zone between urban and rural land, separating town and country and preserving land for forestry, agriculture and wildlife where environmental conditions can be improved and conservation encouraged.
Green belt land now covers around 13 per cent of England, approximately 1.6 million hectares (ref CPRE: Green Belts in England: Key facts). A map of green belt land can be seen on the Telegraph website.
In 1998, in order to limit development on ‘green' and undeveloped land in general, the UK Government set a target for 60 per cent of all new development to be on brownfield land (land which has previously been developed).
Planning Policy Statement 3 (PPS3) published in 2006, re-stated this commitment making clear that local authorities should "take stronger action" to bring brownfield land back into use, and in 2010, it was estimated that 76% of new dwellings were built on previously-developed land. (ref: Brownfield briefing: Coalition stresses commitment to brownfield).
 Pressure on the green belt
In England, in 1800, just 10% of the population lived in towns and cities, now the figure is 90%. England is the third most densely populated major country in the world, and our population is likely to increase further from 52 million in 2010 to 62 million in 2035 (ref ONS Population Projections). In 2011, a report from the Institute of Public Policy Research warned of a housing black hole, suggesting that there would be a a shortfall of 750,000 homes by 2025 (ref IPPR: England faces 750000 housing gap by 2025).
The National Planning Policy Framework (NPPF) published in March 2012 did not include a brownfield target, and in an interview on BBC2’s Newsnight in November 2012, planning minister Nick Boles, suggested that more than 388,000 hectares of open countryside would have to be built on to meet the housing demand. He said that nine per cent of England had been built on, but this needed to increase to 12%.
“We’re going to protect the green belt – but if people want to have housing for their kids they have got to accept we need to build more on some open land”. Boles only offered explicit protection for green belt land around towns and cities (Ref Telegraph: Government minister warns We must develop a third more land to meet the housing demand). In 2012, the green belt was nearly 32,000 hectares smaller than it was in 2003 (ref Telegraph).
- 'to check the unrestricted sprawl of large built-up areas;
- to prevent neighbouring towns merging into one another;
- to assist in safeguarding the countryside from encroachment;
- to preserve the setting and special character of historic towns; and
- to assist in urban regeneration, by encouraging the recycling of derelict and other urban land.'
However, it suggests that 'New Green Belts should only be established in exceptional circumstances, for example when planning for larger scale development such as new settlements or major urban extensions.' The NPPF explains that local authorities should define green belt boundaries in their local plans and that these should only be changed in exceptional circumstances. It sets out considerations that should influence the positioning of green belt boundaries, and lists certain types of development that may not be inappropriate on green belt land, such as facilities for outdoor sport.
On 6 October 2014, DCLG published additional guidance making clear that once they have been established, green belt boundaries should only be altered in exceptional cases, and that this should be done through the preparation or review of the Local Plan. Housing need does not justify harm to the green belt. For more information see Green belt planning practice guidance.
On 16 October 2014, Communities Secretary Eric Pickles said: "I am crystal clear that the green belt must be protected from development, so it can continue to offer a strong defence against urban sprawl." Ref New rules further strengthen green belt protections 16 October 2014.
However, in April 2016, Communities Secretary Greg Clark approved outline proposals for a major development, including 1,500 new homes, in the Gloucestershire green belt, deciding that is was justified due to “very special circumstances”. This was because of unmet local housing demand, longstanding strategic planning aims in the area and the economic benefits of the proposal. Ref gov.uk 1 April 2016.
In September 2016, it was reported that statistics for 2015/16 revealed an overall decrease in the area of designated green belt of 1,020-hectares. In 2014/15, the area of green belt decreased by more than 2,000-hectares.
In July 2017, it was reported that 425,000 homes were due to be built on the green belt, an increase of 54% since March 2016. The Campaign to Protect Rural England (CPRE) warned that government funds are rewarding the development of green belt land that ministers have promised to protect.
The green belt is not universally supported. Some see it as a barrier to growth and suggest that it is unreasonable to continually demand that more housing is constructed whilst simultaneously protecting the green belt. Others suggest that protection of the green belt means our cities become more and more dense, pushing up property prices. It is also argued that green belts do not protect the 'countryside', they protect industrial agriculture, where vast, mono-cultural, biologically barren fields are created that discharge rainwater into our rivers which then flood over-dense urban centres. Some suggest that a more dispersed, lower-density development would encourage more widespread and varied green spaces, providing better wildlife habitats and helping attenuate rainwater run-off.
Think tanks such as the Adam Smith Institute have called for the total abolition of the green belt, arguing that the release of a strip of green belt land half a mile wide around London would provide for 800,000 new homes. Their calls are supported by more moderate organisations such as Centre for Cities and the London Society.
For more information see: The future of the green belt.
In February 2016, housing charity Shelter published a report 'When brownfield isn't enough' in which they suggest, 'Building on some bits of the green belt should be an option, if done right. Smaller, controlled release of appropriate bits of green belt land could deliver substantial numbers of new homes.'
NB it is important to differentiate between the green belt and 'greenfield' which are often confused. Greenfield developments are those which take place on sites that are not constrained by any existing buildings or infrastructure. Clearly this need not be within the protected green belt.
 Related articles on Designing Buildings Wiki
- Amberfield land.
- Areas of Outstanding Natural Beauty.
- Blue belt.
- Brownfield land.
- Contaminated land.
- Deleterious materials.
- Designated sites.
- Ecological network.
- Garden cities.
- Green belt planning practice guidance.
- Green infrastructure.
- Green roof.
- Greenfield land.
- Landfill tax.
- Making the Green Belt work for London.
- Metropolitan open land (MOL).
- National parks.
- National planning policy framework.
- Safeguarding land.
- Sites of Special Scientific Interest.
- Smart cities.
- Strategic industrial locations (SILs).
- The future of the green belt.
- The green belt and historic buildings.
- Windfall site.
 External references
- CPRE: Green belts.
- CPRE: Green Belts: A greener future (summary).
- CPRE: Green Belts in England: Key facts.
- Telegraph: Interactive green belt map.
- Telegraph: Government minister warns We must develop a third more land to meet the housing demand
- Natural England: Green belt publications.
- Natual England: Green infrastructure.
- BBC: Open land can solve housing shortage, says minister.
- Written ministerial statement by Local Government Minister Brandon Lewis about permissions for traveller's sites on green belt land. 17/1/2014.
Featured articles and news
CEOs and high-level executives explain who they expect to be the most successful players in the future of construction.
What are package contracts and how are they broken down? Find out in our introductory article.
Identifying sustainable shoreline protection solutions in the face of rising sea levels and storms in the US.
Budget documents state modern methods of construction will be favoured for public infrastructure schemes from 2019.
A walk-through exhibition of an emergency humanitarian shelter is officially opened at BRE's Innovation Park.
How to work safely on a construction site during winter.
Housing is the big winner in Chancellor Philip Hammond's Autumn Budget.
The winner of our BSRIA competition, Tomorrow's challenges in today's buildings, is.... Bob Hendrikx. A big thank you to everyone that took part.
Committee of MPs accuses government of dealing billpayers a 'bad hand' over the guaranteed power price.
In 1992, the Joint Fire Code was first published. What influence does it still have on construction sites today?
"Companies will have to adapt or go out of business" - how are virtual reality and big data disrupting digital construction?
International Well Building Institute and BRE collaborate on multiple levels to advance human health through better buildings.
"The industry has tried moving away from prescriptivism to focus on performance, but maybe that’s no longer working".