Swimming pools: do I need planning permission?

Swimming pool planning permission is not usually required for an outdoor pool within the curtilage of a dwellinghouse where the proposal falls within Class E of Part 1. But Class E has siting, height and coverage limits, and the position changes for flats, listed buildings, some protected land and pools outside the domestic curtilage.

The excavation for an in-ground domestic pool can form part of the Class E development where it is genuinely required for the permitted pool. Associated buildings, raised platforms, enclosures and plant should be checked separately against the relevant limits.

A domestic swimming pool can be permitted development under Class E of Part 1, provided it is within the curtilage of a dwellinghouse, is required for a purpose incidental to the enjoyment of that dwellinghouse and meets all of the Class E limitations.

Class E expressly includes ‘any building or enclosure, swimming or other pool required for a purpose incidental to the enjoyment of the dwellinghouse as such’. So a pool is not an accidental by-product of the outbuilding rules: it is specifically contemplated by the GPDO.

But surely the digging of a pool is an engineering work – and these need planning permission?!

Section 55 of the 1990 Act describes development as the carrying out of building, engineering, mining or other operations in, on, over or under land and, subject to a number of specified exceptions, planning permission is required for the carrying out of development of land. Building operations include structural alterations of or additions to buildings or other operations normally undertaken by a person carrying on business as a builder. There is no statutory definition of engineering operations.  

Excavation for the pool may itself amount to an engineering operation, but that does not automatically require a separate planning permission. The question is whether the excavation is reasonably ancillary to the Class E pool rather than a separate operation of substance in its own right.

An inspector, in a case APP/X5210/X/15/3006433 explains it so much better than I can…….

It is not whether the works are an engineering operation or not, but whether, whatever form of development they may be, they amount to a separate activity of substance that is not ancillary to the activity that benefits from permitted development rights. In this case Class E grants permission for a swimming pool. Whether in a basement or a garden, a swimming pool will, if sunken into the ground, require considerable excavation works. Consequently, Class E clearly assumes there may well be excavation works to provide a pool that otherwise benefits from a permission granted by that class. Such works must therefore be reasonable ancillary to the provision of the pool. In this case no works are suggested that would exceed what is reasonably necessary to cater for the pool itself and so I can see no reason why the pool and the excavation of the soil to create the pool should not benefit from the permitted development rights granted by Class E.

If Class E rights have been removed by an Article 4 direction or a planning condition, a planning application may be required. Class E is also expressly unavailable for a pool situated within the curtilage of a listed building.

You can’t use Class E to construct the pool on land forward of a wall forming the principal elevation of the original dwellinghouse.

Pools in Conservation areas

You can construct a swimming pool in a conservation area.

In a conservation area, Class E does not permit a pool on land between a wall forming a side elevation of the dwellinghouse and the curtilage boundary. A pool in that side strip therefore needs another source of planning permission. Moving the pool behind the house can avoid this particular Article 2(3) restriction, but all the other Class E limits still need to be satisfied. If a planning application is needed, Planning Geek can provide a fee proposal.

The actual legislation says ‘in a conservation area, development is not permitted by Class E if any part of the building, enclosure, pool or container would be situated on land between a wall forming a side elevation of the dwellinghouse and the boundary of the curtilage of the dwellinghouse‘ – therefore this includes both the original and any subsequent rear extensions. If the pool came before the rear extension, you should be fine. But please keep evidence. Note that as this is the land between a side elevation and the boundary, it does not include any land behind the house, even if it is in line with the side of the house.

Swimming pools in National Parks, National Landscapes and World Heritage Sites

You can construct a swimming pool in a National Park, the Broads, a National Landscape or a World Heritage Site under Class E where all the relevant limits are met. Additional restrictions apply on this protected land.

The same Article 2(3) side-land restriction applies in National Parks, the Broads, National Landscapes and World Heritage Sites. If any part of the pool would be on land between a side wall of the dwellinghouse and the curtilage boundary, Class E will not authorise it. If you need a planning application, Planning Geek can help.

Behind the house you still need to check the rest of Class E. On these protected landscapes, the special 20m rule limits the total ground area of Class E buildings, enclosures, pools and containers situated more than 20 metres from any wall of the dwellinghouse to 10 m². Being within 20 metres avoids that particular 10 m² restriction, but it does not switch off the other Class E limits.

The actual legislation says ‘In the case of any land within the curtilage of the dwellinghouse which is within— (a) an area of outstanding natural beauty; (b) the Broads; (c) a National Park; or (d) a World Heritage Site, development is not permitted by Class E if the total area of ground covered by buildings, enclosures, pools and containers situated more than 20 metres from any wall of the dwellinghouse would exceed 10 square metres.’

Importantly this also impacts existing buildings. So if you already have an old shed of say 5 sq m more than 20m from the house, you are limited to just a further 5 sq m. Even if this shed was either built by someone else, or had full planning permission.

Beyond a hole in the ground

If you are looking to enclose the pool in a building or add a pump room, the building element can also fall within Class E of Part 1 where all of its limitations are met. That includes the position, height and coverage limits, and the requirement that the development is for a purpose incidental to the enjoyment of the dwellinghouse. An enclosure or pump room does not get a separate allowance simply because it serves a swimming pool.

Indoor pools

Purely internal alterations may fall outside the definition of development under section 55, but an indoor pool project can still involve external building or engineering operations which need separate consideration. If the building is listed, listed building consent is required where the works would affect its character as a building of special architectural or historic interest.

Swimming Pools Page Updated: 2nd September 2026

Other Common Projects