Research has suggested that housing sites comprising 2,000 or more homes take longer than eight years on average from application to completion.
According to research by planning consultancy Lichfields, this means that large schemes tend not to deliver within the time window for local authorities to meet their five-year land supply statements. However, the delivery of large schemes speeds up after year five of development.
Lichfields' consultancy update, Start to Finish, considers the length of time it takes for different-sized sites to deliver homes. It analyses 97 sites of more than 500 dwellings, 35 of which were designed to deliver 2,000 homes or more. These equate to more than 195,000 dwellings.
It finds that sites that were supposed to deliver 500 homes or fewer have consistently delivered those units within five years of submitting an outline planning application, taking about three years on average. Lichfields say this reflects the practicalities involved in discharging conditions, servicing the site and building new homes.
The study also finds that:
The Government's garden communities programme is expected to contribute more than 400,000 homes to its target to deliver 300,000 homes a year, but previous research found that it could take five years before the programme has momentum to make a significant contribution.
Lichfields suggests that it would take until 2050 for the programme to be built out in full, without consideration of unforeseen delays. The next five years would see 21,000 homes delivered, after which the rate of delivery would be increased to 16,000 each year after 2030 until 2044, when it would taper off to 13,000 homes a year.
The factors behind the average eight-year period from planning to completion of the first home identified in Start to Finish will vary between sites, states Lichfields. It points to the significant reductions in local authority planning resources over the past 10 years as a contributory factor.
Other delays lie outside the planning system, such as securing the necessary technical approvals from other bodies and agencies.
Lichfields' senior director Matthew Spry, commented: "It is incumbent on local planners to have a good understanding of the circumstances of development of a particular site so they can identify what might help to improve the pace of build-out, but then also be prudent in what is expected to be delivered, so supply is maintained throughout the plan period"
"A number of local plans have hit troubles because they overestimated the yield from some of their proposed allocations, and in too many local plans and five-year housing land supply cases, there is insufficient evidence to justify how large sites are treated in housing trajectories".
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