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The spectre of landbanking has never been far away in recent months, most recently rearing its head in discussions around the new National Planning Policy Framework. By now we鈥檙e all familiar with the notion that if it weren鈥檛 for landbanking we wouldn鈥檛 have a housing crisis, councils everywhere would have a five-year supply of housing land and there would be no need to develop on either greenfield or greenbelt sites.

There is an unfortunate fact, though, for those that choose to blame landbanking for the housing crisis - it doesn鈥檛 actually happen.

We can be confident it doesn鈥檛 happen because of the number of times it has been investigated. The Barker Review (2004), the Callcutt Review (2007) and the Lyons Review (2014) all found no evidence that it happens. Nick Boles, Planning Minister in 2013, asked his department to carry out a factual review to look for signs of the practice - they found none. And if that isn鈥檛 enough, in 2008 the Office of Fair Trading investigated the house building industry and found no evidence of landbanking either. That鈥檚 five reviews in 14 years, all agreeing that landbanking does not happen.

There are some very good reasons for that.

Firstly, it wouldn鈥檛 work. New build sales only account for around 12 per cent of transactions - not enough to distort the market sufficiently to make prices rise dramatically. Furthermore, the 10 biggest house builders only control 40 per cent of the new build market.

Secondly, it makes no business sense. House builders have business models based on Return on Capital Employed. They spend a lot of money buying sites. They don鈥檛 just want that cash to sit there, doing nothing. They need to start getting a return on that money. They need to build homes as quickly as they can.

There are a plethora of factors acting to constrain that rate of build; the ability of the local market to absorb sales and the availability of labour, for example. Technical challenges can also be a factor, particularly with very large sites - perhaps the number of homes they can build is limited until some infrastructure improvements are delivered, for example.

Developers do what they can to combat all those constraints in order to allow them to build and sell as quickly as possible. Some even go so far as having multiple brands to help them sell more homes in the same market areas (sometimes even the same sites) - think Barratt and David Wilson, or Persimmon and Charles Church.

In the words of the Callcutt Review: 鈥渙ther things being equal, housebuilders have a strong incentive to build out as quickly as possible. The basis on which investors measure their success demands that they build out sites promptly to release and recycle the capital and deliver a good return on capital.鈥�

Despite that, some still point to the size of the landbank that developers declare in their annual reports as 鈥減roof鈥� that landbanking must happen.

But it isn鈥檛 proof - those 鈥渓andbank鈥� figures are the total number of homes with planning permission controlled by the developer which aren鈥檛 yet built, expressed as a number of years鈥� production based on their current volumes.

The size of that landbank is a function of how difficult it is to deliver planning permission. There are three main stages that need to be navigated before homes are actually built.

The pre-planning stage consists of identifying suitable sites, preparing planning applications and carrying our community consultation. The Callcutt Review estimated that takes between 1.3 and 2.1 years, depending on the size of the site.

Then there is the planning stage itself, during which the application is considered by the local authority - most housing applications take at least six months to be determined, if not more.

Lastly comes the post-planning stage, during which pre-commencement conditions are discharged, working drawings are prepared, contractors are appointed and infrastructure works are carried out. Various sources all agree that it takes an average of 12 months to work through those stages before the first home can be completed.

Overall, that鈥檚 somewhere between three and four years to bring a new site on-stream. Self-evidently, developers therefore need enough homes with planning permission to keep their operations going while new land is being sourced and made ready for development. And if they plan on growing their business, and increasing the number of homes they build, the size of the landbank will go up.

It鈥檚 interesting that there has been an upsurge in accusations of landbanking at exactly that time that national planning policy is putting pressure on local councils to actually deliver enough homes. If they aren鈥檛 doing that, the housing policies in their local plans are considered out-of-date and planning permission can (and should) be granted on sites where the local plan didn鈥檛 intend it to.

It might be politically expedient to try to lay the blame for the housing crisis at the door of the major house builders. After all, the alternative explanation is the central and local government isn鈥檛 doing enough to make sites available for housing development.

The inconvenient truth is that landbanking simply doesn鈥檛 happen.