Most single storey rear extensions on ordinary houses in Peterborough can be built without a planning application, thanks to permitted development rights. But the rules have limits, and a few local factors can catch people out. Here is how to work out where your project sits before you spend money on drawings.
Permitted development rights let you extend a house within set limits without a planning application. They apply to houses only, not flats or maisonettes, and only if the rights have not been removed by a previous planning condition. Many newer estates around Hampton, Stanground South and parts of Orton had permitted development rights restricted when they were first approved, so it is worth checking the original decision notice before assuming you are covered.
The limits below are the ones that matter most for a typical extension. If you stay inside all of them, you do not need to apply, though you will still need Building Regulations approval, which is a separate process.
If any part of your extension falls outside the limits above, you need to apply to Peterborough City Council. Common triggers we see are two storey extensions close to a boundary, wrap around extensions that combine side and rear, front porches over 3 square metres, and extensions on homes where the original house has already been enlarged. Remember that the term original house means as it stood in 1948 or when first built, so a previous owner's conservatory or garage conversion counts against your allowance.
Location matters too. Homes in conservation areas such as Peterborough city centre, Longthorpe, Thorney and parts of Barnack have reduced permitted development rights, particularly for side extensions and anything visible from the street. Listed buildings need listed building consent for almost any alteration. Properties near the River Nene, the Ortons and Fletton may sit in flood zones, where the council may ask for a flood risk assessment even for modest extensions.
A householder application to Peterborough City Council currently costs a little over 250 pounds in fees, plus the cost of scaled drawings, which for a straightforward extension usually runs to somewhere between 600 and 1,500 pounds depending on the designer and whether structural details are included at the same stage. The statutory decision period is eight weeks, though it can stretch if neighbours object or the case officer requests changes.
A prior approval notification for a larger single storey rear extension is quicker and cheaper. You submit a simple description and plans, the council writes to adjoining neighbours, and if nobody objects within 21 days you can usually proceed after the 42 day period ends. If an objection comes in, the council assesses the impact on that neighbour's amenity before deciding.
Whether or not planning permission is needed, every extension needs Building Regulations approval. This covers foundations, insulation, structural steel, drainage, electrics and fire safety, and it is inspected at set stages during the build. Peterborough clay soils and the peaty fen ground to the east can mean deeper or wider foundations than you might expect, and trees close to the house affect this further.
If you are building on or near the boundary with a neighbour, the Party Wall Act applies. You must serve notice at least one or two months before starting, depending on the type of work, and your neighbour can consent or ask for a surveyor. Finally, if you are building under permitted development, a Lawful Development Certificate from the council is optional but strongly worth having. It costs around half the fee of a full application and gives you written proof that the extension was lawful, which solicitors increasingly ask for when you come to sell.
A conservatory is treated the same as any other single storey extension, so the same size and height limits apply. If it stays within permitted development limits you will not need to apply, but a glazed structure with a solid roof or orangery style build will usually still need Building Regulations sign off.
Yes, a bungalow is a house so the same rights apply, but the overall height limit of 4 metres for single storey work and the rule that extensions cannot be taller than the existing roof can be limiting. Loft conversions and dormers are covered by separate allowances.
The council can serve an enforcement notice requiring you to alter or remove the work, and it will show up on a property search when you sell. A retrospective application is sometimes possible, but it is far cheaper and less stressful to check first than to argue later.
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