Planning Permission for Conversion Projects

Mike Dade explains the ins and outs of getting planning consent to convert an existing structure to residential use
by Mike Dade
25th November 2012

Conversion projects offer a superb way to create a unique and characterful home. Buildings suitable for conversion are often in locations, both urban or rural, where it would be impossible to build a new house. Converting an existing structure is also environmentally friendly, as you’re recycling the energy and materials that went into the original building.

But getting planning permission for conversions isn’t always as straightforward as a new build. So, what are the likely planning issues and the best way to deal with them?

Conversion basics

When you find a building to convert you must be sure it’s capable of providing the accommodation you want, in terms of number of rooms, room sizes and heights. Particularly if the building is old or listed, scope for substantial internal or external change is likely to be limited. In the countryside you’re also unlikely to be able to extend the building. Remember that planning permission is generally granted for conversion primarily as a means to preserve the property and this can significantly constrain your freedom for design innovation.

Check your council’s planning policies that apply to conversions in their Local Development Framework. In the countryside they’ll be quite restrictive about when conversions to residential use are allowed, the types of buildings that can be converted and what can be done to the buildings concerned.

Get a structural survey done as soon as possible. Is the building capable of being converted or does it really need rebuilding? Does it need underpinning, a new roof, re-built walls, and so on? Will it be possible to bring the building up to building regulations standards in terms of insulation and natural light? The survey is an essential first step in sorting out a realistic budget for your project.

Urban conversions

In cities, towns and villages there are less likely to be restrictions on alterations and additions to existing buildings, but there may well be restrictions on the types of uses that can be lost to conversion. For example, village and neighbourhood shops and pubs, offices in town centres and shops in main retail streets. Always check in the Local Development Framework what policies apply to the location of your building. If in doubt, get confirmation from a planning officer.

If policy restricts the loss of the building’s current use, ask whether or not this can be overcome if the building has been vacant for some time. Typically, evidence of unsuccessful marketing for a period of six months or a year is sufficient to deal with this type of policy problem.

Government planning policy is strongly supportive of urban conversions, but is also committed to making the most efficient use of existing urban buildings. Creating one larger house out of a building could be resisted if there’s actually space for, say, several smaller flats. Counters to this include showing that the building isn’t suited to being divided up; that parking space is inadequate for more than one unit; that there isn’t enough amenity (garden) space for a number of flats; or that some of the smaller units would have inadequate light or outlook. It might also be possible to present an economic argument to show that your proposal is viable, whereas more, smaller units wouldn’t be.

Rural conversions

Council policies for rural conversions favour commercial re-use schemes – offices, workshops or tourism related uses, such as holiday lets – in order to boost the rural economy.

However, Government policy indicates that residential use can be more appropriate in some situations. For example, a barn that adjoins a farmhouse or other dwellings or a building with poor access might be deemed unsuited to business re-use. In the case of a listed building, where conversion costs are likely to be high, business re-use might not be economically viable.

In all rural situations where you can convert to a home, expect strict limits on extensions and new outbuildings. In addition, the conversion should preserve the character and appearance of the building. Numerous new windows, for example, are likely to be resisted.

There might, though, be scope to improve the appearance of the building or its surroundings by removing unsightly modern additions or large ugly buildings nearby. Such enhancements can sometimes be traded for alterations or extensions to your building.

As with urban conversions, some councils insist a rural building be marketed for a period for commercial use, before they’ll consider residential use.

The extent and design of the garden, or ‘residential curtilage’ as the planners call it, comes under close scrutiny in rural conversions. Don’t assume that because a building has a certain amount of land attached to it, or sold with it, that all of that land can automatically become garden.

Suburban-type planting and garden features such as washing lines, sheds, playhouses, all tend to be seen as harmful to the rural setting. In some cases the extent of the garden is obvious – an existing courtyard perhaps or area defined by a hedge or wall. Where a new garden has to be created, a well considered landscape plan, retaining the rural character of the site, will help you negotiate with the planning officer the garden area you want.

Don’t expect to that you’ll be able to build a garage or other outbuilding once your building is converted. Planners generally impose conditions on the grant of planning permission that prevent future outbuildings or extensions to the main building. Ideally, utilise existing outbuildings if they’re attractive, or offer to remove ugly ones in exchange for better design and more appropriate materials. An open fronted cart-shed is more likely to be acceptable alongside a rural conversion than a more suburban-style double garage with ‘up and over’ doors.

Planning applications

Planning applications for conversions must be made in full, that is, supported by detailed drawings of the building ‘as is’ and ‘as proposed’.

Unless the building is obviously in sound structural condition, a structural survey is likely to be required as well. Employ the services of a designer who is experienced in conversions and, if the building is listed, in dealing with historic properties.

With listed buildings, listed building consent is required alongside planning consent, and drawings have to show in considerable detail how features of it will be preserved. In conservation areas, conservation area consent is needed for anything to be demolished, including things like boundary walls.

Don’t forget that all applications for conversions will need a Design and Access Statement, and many involving listed buildings or buildings in conservation areas will also need a ‘Heritage Asset Statement’, to explain how the ‘heritage asset’ will be preserved.

It’s become increasingly common for councils to ask for ‘bat surveys’ to be undertaken to ensure a building isn’t a roost for bats and, in the case of old barns, for a survey to check for the presence of barn owls. This information, together perhaps with a full ecological survey, might have to be submitted with the planning application. Get specialist help – a note saying ‘I haven’t seen any bats’ won’t do.

Similarly, with rural building conversions, councils often ask for an environmental survey to check for contamination either in the building or potentially affecting the garden area. If required, this needs to be submitted with the application, and accounted for in your budget.


Conversions can be more complex than new builds from a planning perspective, so ensure you take good advice before plunging in and buying a building to convert, unless of course it’s already got permission to convert in the way you’d like. But with the right approach, conversions offer scope to create innovative and attractive living spaces – both urban and rural.

Main image: Stable converted into a new home… full story

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