Most single storey rear extensions in Peterborough are built without a full planning application, because they fall under permitted development rights. But that depends on the size, your property type and a few local catches that catch people out, so it pays to check before you commit.
Permitted development (PD) lets many homeowners extend without a formal planning application. For a detached house, a single storey rear extension can go back up to 4 metres from the original rear wall; for a semi or terrace, the limit is 3 metres. Under the larger home extension rules these can reach 8 metres (detached) or 6 metres (others) with prior approval from Peterborough City Council, which involves notifying neighbours.
There are height rules too. The extension must not exceed 4 metres in height overall, or 3 metres if it sits within 2 metres of a boundary. The eaves cannot be higher than 3 metres near a boundary, and you cannot cover more than half the land around the original house.
Permitted development rights do not apply everywhere. If you live in a conservation area (parts of Peterborough city centre, Stamford-edge villages and many Cambridgeshire settlements have them), a listed building, or a flat or maisonette, you will almost certainly need to apply. The same goes for two storey rear extensions, which have their own tighter rules and usually attract more scrutiny over overlooking and light.
Rights can also have been removed by an Article 4 Direction or by a condition on a newer estate, which is common on modern developments around Hampton, Cardea and Paston. Always check your deeds and the council's online maps before assuming PD applies.
Whether or not you need planning permission, your extension must meet building regulations. This covers foundations, structural support, insulation, drainage, ventilation, fire safety and electrics. It is a separate process from planning and is signed off by a building control surveyor.
Two points trip people up locally. Much of Peterborough sits on clay or near watercourses, so foundation depth and ground conditions genuinely matter and can affect cost. And if you build within or near a shared boundary, the Party Wall etc. Act 1996 may require formal notice to your neighbour, typically two months before work starts.
Start by confirming your property type and whether any restrictions apply, then measure your proposed depth against the limits above. If you are comfortably inside PD, a Lawful Development Certificate from the council is well worth the modest fee, as it gives you proof for any future sale.
If you are over the limits or in a restricted area, budget time for the planning process, which usually runs around eight weeks for a householder application. Getting accurate drawings and a realistic build plan in place early saves money and avoids a stalled project later.
A householder planning application fee is set nationally and is currently a few hundred pounds, while a Lawful Development Certificate is roughly half that. You will usually also pay separately for drawings and any structural calculations.
A full householder application typically takes around eight weeks once validated. Prior approval for a larger extension involves a neighbour consultation period of around six weeks, while a Lawful Development Certificate is usually quicker.
No. Building before approval risks enforcement action and may force you to undo the work, and it can also create problems when you come to sell. Confirm your planning position and building control sign off first.
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