Most single-storey extensions in Preston go ahead without a full planning application, thanks to permitted development rights. But those rights come with strict size limits, and getting it wrong can mean enforcement action or problems when you sell. Here is what actually applies, in plain terms.
Permitted development rights let you extend a house without applying for planning permission, provided you stay within set limits. They apply to houses only, not flats or maisonettes, and only if a previous owner has not already used them up. On many newer estates around Preston, including parts of Cottam and Buckshaw Village, developers had these rights removed as a planning condition, so always check your property's history before assuming anything.
For a rear single-storey extension, the standard limits are 3 metres beyond the original rear wall for a semi-detached or terraced house, and 4 metres for a detached one. Under the larger home extension scheme you can go up to 6 metres and 8 metres respectively, but you must notify the council first so neighbours can comment. That is called prior approval, and it typically takes around six weeks.
Two-storey extensions are where most people trip up. Under permitted development a two-storey rear extension can only project 3 metres and must be at least 7 metres from the rear boundary, which rules it out on many typical Preston plots. Anything to the front of the house facing a highway, wrap-around extensions, and anything on a flat above a shop will need a full application.
Location matters too. If your home sits in a conservation area, such as Fulwood's Avenham or the streets around Winckley Square, permitted development rights are reduced and side extensions generally need permission. Listed buildings need listed building consent on top of any planning requirement, and some streets carry Article 4 directions that strip back rights further. Preston City Council's planning team can confirm what applies to your address, or a builder or architect who works locally will usually know the problem areas.
A householder planning application in England currently costs £528 and the council has eight weeks to decide, though extensions to that timescale are common. If you are building under permitted development, we strongly recommend applying for a lawful development certificate, which costs half the planning fee. It is not compulsory, but it is written proof the extension was legal, and solicitors increasingly ask for it when you come to sell.
Whatever route you take, building regulations approval is separate and always required for an extension. That covers the structural work, insulation, drainage and electrics, and is inspected as the build progresses. If your extension comes within 3 metres of a shared wall or 6 metres of a neighbour's foundations in some cases, the Party Wall Act may also apply, which means serving formal notice on next door before work starts.
Get the planning position confirmed in writing before you spend money on detailed drawings. A quick check with Preston City Council or a measured survey against the permitted development limits costs little and avoids the worst outcome, which is being told to alter or remove a finished extension. Enforcement is rare but it does happen, particularly where an extension overlooks neighbours or breaches height limits near a boundary.
Also measure from the original house, not the house as it stands today. If a previous owner added a kitchen extension in the 1990s, that already counts against your allowance. Old estate agent listings, the council's planning register and your deeds all help establish what the original footprint was. A decent local builder will flag these issues at the quoting stage rather than after the footings are in.
Preston City Council aims to decide householder applications within eight weeks of validation. In practice, allow 8 to 12 weeks, and longer if the case officer requests amendments or neighbours object.
Neighbours can comment on a planning application, and their concerns about overlooking or loss of light will be weighed by the council, but they cannot veto it. Under permitted development they have no formal say unless you use the larger home extension route, where objections trigger a council assessment.
Yes, almost always. Building regulations approval is a separate system covering the safety and quality of the construction itself, and it applies to virtually every extension regardless of whether planning permission was needed.
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