Most single storey extensions in Lancashire go ahead without a planning application, but plenty of homeowners in Burnley, Padiham and the Ribble Valley still get caught out by a conservation area, a previous extension or a loft conversion that has already used up their allowance. The rules are national, but how they apply to your house depends on its size, its history and its street. Here is how to work out where you stand before you spend money on drawings.
In England, including every council area in Lancashire, houses have permitted development rights that let you extend up to certain limits without a planning application. For a detached house, a rear single storey extension can go out 4 metres from the original rear wall, or 3 metres for a semi or terrace. Under the larger home extension scheme these limits rise to 8 metres and 6 metres, but you must notify the council first through the prior approval process so neighbours can comment.
The extension must be single storey with a maximum height of 4 metres, or 3 metres for the eaves if it sits within 2 metres of a boundary. Side extensions are capped at half the width of the original house. The total footprint of all extensions and outbuildings must cover no more than half the garden as it stood when the house was first built, not when you bought it.
The word original matters. Permitted development is measured against the house as it stood on 1 July 1948 or when it was built if later. Many stone terraces around Burnley, Nelson and Colne already have a rear outrigger or a 1970s kitchen extension that counts against the allowance. If a previous owner has extended, you may have less room than the headline figures suggest, or none at all.
Conservation areas remove some rights entirely. Side extensions, two storey rear extensions and cladding are not permitted development in the conservation areas around Worsthorne, Whalley, Downham and parts of central Burnley and Padiham. Listed buildings need listed building consent for almost any change. Newer estates are another trap: developers often had permitted development rights removed as a planning condition, so a 2015 house on a new build estate in Hapton or Huncoat may need full permission for a modest conservatory.
Even when no planning application is needed, nearly every extension must comply with Building Regulations. This covers foundations, structural steels, insulation, drainage, fire safety and ventilation. You can use the council building control team at Burnley, Pendle, Hyndburn or Ribble Valley, or an approved private inspector. Fees for a domestic extension typically run from around £400 to £900 depending on floor area and whether you use full plans or a building notice.
The clay soils and old mine workings across parts of East Lancashire mean building control will often want to see foundation depths of at least a metre, and sometimes a coal mining report before work starts. A builder who knows the area will factor this into the quote rather than adding it later as an extra.
The cheapest certainty comes from a Lawful Development Certificate. You apply to your district council with drawings showing the extension meets the permitted development limits, pay roughly £145, and receive a formal document confirming no planning permission is needed. Solicitors will ask for this when you sell, so it is worth having even when you are confident.
If your extension does need permission, a householder application costs around £258 in application fees plus your architect or technician drawings, which in this area usually fall between £600 and £1,500 for a straightforward scheme. Decisions take a target of eight weeks. Most councils in Lancashire offer a pre-application advice service for a modest fee, which is sensible for anything two storey, on a corner plot or close to a neighbour's window.
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