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Planning permission is the first thing most homeowners ask when they think about extending, and it has become genuinely more complicated over the last decade rather than simpler. Permitted development rights – the rules that let householders extend without a formal planning application in some circumstances – have expanded, contracted and been amended so many times that the internet is full of out-of-date guidance. The practical reality is that most single-storey rear extensions on standard Bournemouth homes can be built without a full planning application, but the rules matter and getting them wrong is expensive.
Permitted development rules for householders in England cover extensions up to a certain size, subject to a long list of conditions. The size limits are different for detached and semi-detached houses, different again for terraces, and further different in conservation areas and Areas of Outstanding Natural Beauty. For a typical detached house outside a conservation area, a single-storey rear extension can extend up to eight metres from the original rear wall under the larger home extension rules, with a maximum height of four metres. Semi-detached and terraced houses are limited to six metres. Both figures assume the extension is genuinely single-storey and does not touch the ridge line.
Conditions attached are extensive and easy to breach without realising. The extension cannot cover more than half the area of the original garden. The materials must be in keeping with the existing house – not identical, but similar. No part of the extension can be forward of the principal elevation, which is usually the front. Two-storey extensions have a much tighter set of rules, with a maximum depth of three metres Plans and building control various setbacks from boundaries. Any of these conditions failed makes the project unlawful, and rectifying it after the fact is painful.
The larger home extension rules, allowing single-storey rear extensions between four and eight metres deep on detached houses, require a Prior Approval application to the local council. It is not a full planning application but it is more than a rubber stamp – neighbours are notified, and if any of them object on the specific grounds allowed by the process, the council can refuse. Most Bournemouth Prior Approvals go through without objection, but the process still takes several weeks and cannot be skipped.
Conservation areas change the calculation significantly. Article 4 directions, which some Bournemouth streets are under, remove permitted development rights entirely for certain types of work. If the property is in a conservation area, planning permission is often required for what would be permitted elsewhere, and the design has to fit the character of the area rather than just meet the physical size rules. This is not a bad thing – it is what keeps a conservation area worth living in – but it adds time and cost to any project.
Homes with a Listed Building status sit in a different regime again. Any material alteration to a listed building requires Listed Building Consent, whether or not planning permission is also required, and internal changes count as much as external ones. The scope of what “material alteration” means is broad. Anyone considering work on a listed property in Bournemouth or the surrounding villages should have a conversation with the conservation officer at the council before spending money on drawings, because it is the single fastest way to find out what is actually feasible.
Building Control is separate from planning and always applies. Even a project that does not need planning permission needs to meet Building Regulations, which cover structural safety, insulation, fire safety, drainage, ventilation and other matters. Building Control approval is either through the local authority or through an approved private inspector, and it involves inspections at defined stages of the build. A completion certificate at the end is the document that lenders, buyers and insurers ask to see later.
The sensible path for most homeowners is to start with a pre-application enquiry to the council. It is inexpensive, takes a few weeks, and gets a written opinion from a planning officer on whether the scheme as sketched is likely to be acceptable, whether it needs a full application or can go through Prior Approval, and any specific concerns to address in the design. That one document usually saves months and thousands of pounds compared to jumping straight into a full application without understanding the constraints.