Most single storey extensions in Lancashire do not actually need planning permission, thanks to permitted development rights. But the rules have limits, and getting it wrong can mean rebuilding work at your own cost. Here is what genuinely applies to homes in Preston and the wider county.
Permitted development rights let you extend your home without a planning application, provided the extension stays within set limits. These are national rules, so they apply in Preston, Chorley, South Ribble and the rest of Lancashire in the same way, unless your property has had those rights removed.
The key point is that the limits are measured from the original house as it stood in 1948 or when first built. If a previous owner already added an extension, that counts towards your allowance, which catches a lot of people out on older terraces and semis around Preston.
Two storey rear extensions usually need permission unless they meet strict conditions, including staying at least 7m from the rear boundary. Anything extending forward of the front wall facing a road will almost always need an application, as will wraparound extensions that combine side and rear elements.
Flats and maisonettes have no permitted development rights at all, so any extension needs permission. The same applies if your house is listed, where you will also need listed building consent, or if a previous planning approval on your estate removed permitted development rights, which is common on newer housing developments across Lancashire.
Conservation areas tighten things considerably. Preston has several, including Winckley Square, Avenham and Fulwood, and villages across the Ribble Valley and Fylde have their own. In a conservation area you lose the right to side extensions and the larger 6m and 8m rear extension allowance, and cladding the outside of the house needs permission too.
Some areas are also covered by Article 4 directions, where the council has removed specific permitted development rights. It is worth a quick check with your local planning authority, whether that is Preston City Council, South Ribble, Chorley or Ribble Valley, before you commit to a design. Their planning teams can confirm what applies to your address, and most publish conservation area maps online.
If you do need permission, a householder application in England currently costs around £528 and the council has a target of eight weeks to decide it, though allow longer if neighbours object or the case officer requests amendments. Most straightforward domestic extensions in Lancashire are approved, particularly where the design respects neighbouring light and privacy.
Even when your extension falls under permitted development, we would strongly recommend applying for a lawful development certificate, which costs roughly half the planning fee. It is formal proof from the council that your extension is legal, and it matters enormously when you come to sell, because buyers' solicitors routinely ask for it. Separately, remember that building regulations approval is always required for an extension regardless of planning, covering structure, insulation, drainage and electrics.
A good builder should be able to tell you early on whether your plans look like permitted development or will need an application, and flag issues such as previous extensions eating into your allowance or a shared drain running under the proposed footprint, which needs a build over agreement with United Utilities.
At Lime Property Group we work alongside local architectural designers who prepare drawings for either route, and we build to the approved plans with building control inspections at each stage. If you are unsure where your project stands, an initial conversation and a look at your property's planning history costs you nothing and can save months.
On most Lancashire houses you can build a single storey rear extension of 3m on a semi or terrace, or 4m on a detached house, without an application. Larger extensions up to 6m or 8m are possible through the prior approval process, where the council consults your neighbours first.
A neighbour's objection does not decide whether permission is needed, only the rules do. If your extension is permitted development it can go ahead regardless, though under the prior approval route for larger extensions the council will weigh any objections about the impact on neighbouring homes.
Councils aim to decide householder applications within eight weeks of validation. In practice allow two to three months from submitting, and longer if the design needs amending, so it pays to apply well before you want to start on site.
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