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There are numerous pervading misconceptions, which continue to exacerbate the housing crisis:

鈥淭he green belt is a mark of high quality countryside鈥� (it isn鈥檛)

The green belt is just a planning policy designed to manage the growth of cities; it doesn鈥檛 denote landscape, ecological or any other quality. In fact, much of the green belt consists of previously developed land, poor quality grassland and roadside verges.

Countryside quality is covered by other designations. For example, high quality landscapes are denoted by National Parks and Areas of Outstanding Natural Beauty, ecological quality is covered by designations like Sites of Special Scientific Interest and National Nature Reserves. Those areas quite rightly have their own protections from development - but they aren鈥檛 green belt.

鈥淭he green belt is under threat like never before鈥�

The green belt is huge. It covers around 13% of the country, compared to just 8% that is developed.

There are actually 29,690 hectares more green belt today than in 1997 - enough for around 42,000 football pitches. Whilst it鈥檚 true that some green belt has been released for development over recent years, the amount - 4,950 hectares over the last ten years - is small compared to its overall size. At current rates, it would take almost 3,000 years for all the green belt to be developed.

鈥淗omes built in the green belt are too expensive so won鈥檛 help to solve the housing crisis鈥�

By that logic, we should just stop building homes altogether. Homes are expensive everywhere - that鈥檚 what the housing crisis is.

The price of new homes in the green belt is related to those nearby - which are high because the green belt has limited building. Rates of development in areas with green belt are around a third lower than they would otherwise be, while eight of the ten most unaffordable towns and cities in England are constrained by the green belt. That isn鈥檛 a coincidence.

If we鈥檙e going to tackle the housing crisis - and build the 300,000 homes a year that the country needs - more housing needs to be delivered everywhere.

鈥淭he green belt provides space for recreation鈥�

Public access was one of the original aims of the green belt when it was first talked about in the late 1800s. By the time the first green belt was proposed in the 1930s, its aim was to restrict the spread of London - nothing more.

Today, very little of the green belt is publicly accessible - most of it is in private ownership. For example, only 13% of the Metropolitan green belt around London is accessible to the general public.

鈥淲e can save the green belt from development if only we built on all the derelict brownfield land鈥�

The Campaign to Protect Rural England - to all intents and purposes the green belt鈥檚 Praetorian Guard - estimate that there is enough brownfield land to deliver just over 1.1 million homes. That鈥檚 a big number, no doubt, but compared to the 300,000 homes a year we need to deliver, it won鈥檛 last very long.

Local plans are supposed to plan for development needs over a period of at least fifteen years. For boroughs with green belt, it is usually inevitable that they need to consider which parts of it can be sensibly developed in addition to using brownfield sites.

鈥満诙瓷缜� on the green belt is not sustainable鈥�

It can actually be more sustainable. Sustainable development means meeting the needs of current generations without prejudicing the ability of future generations to meet their own needs. We can鈥檛 have sustainable development unless we鈥檙e building enough homes for everyone - and the green belt is part of the reason we can鈥檛.

The green belt has other unsustainable impacts too. For example, recent research has shown that the restrictions it places on house building increases commuting distances as it becomes more difficult for people to find a suitable home close to their place of work. As the supply of housing becomes less flexible and the costs of moving increase, the labour force becomes less mobile - slowing economic growth.

鈥淲ithout the green belt, the countryside will be lost forever鈥�

The vast majority of the countryside isn鈥檛 green belt at all, and yet it鈥檚 never been built on. Only around 8% of the country has been developed. There鈥檚 no reason to expect the countryside would disappear if it wasn鈥檛 designated as green belt.

Much of the green belt is already covered by other protections too. A third of Local Nature Reserves and nearly a fifth of ancient woodland is within the green belt - those protections by themselves would prevent development, even without a green belt designation.

Green belt - the reality

Green belt is a planning policy primarily intended to manage the growth of towns and cities. When it was introduced in the 1950s it was the companion to the development of New Towns. Growth would be restricted in some areas, but encouraged in others.

At the time, the population was under 40 million - today it is approaching 60 million. Whilst the green belt remains, there is no companion policy to make sure that the development we need can actually take place.

When decisions are being made about how more homes can be delivered, we need to remember that - without being blinded by the many misconceptions.

Paul Smith, MD, Strategic Land Group