Do you need planning permission for a shed, garage or other outbuilding? 

 

Do I need permission to build a garage, shed or office in my garden? ‘I need an outbuilding as I have outgrown the house!’

The good news is that for most people you can build that structure in the garden as long as you keep to a few simple rules. The most important being up to 50% of your curtilage for additions (including extensions) and a maximum height of 2.5m if within 2m of a boundary. Other requirements are shown below.

This is Class E of Part 1 of the GPDO.

When we talk about outbuildings – think of sheds, home office, swimming pools, gyms, kennels, stables for domestic animals. etc. that are to be used by those living in the house. But any outbuilding or shed should be for the use of the residents and be in proportion to the dwelling. If the house is 100 sq m and the outbuilding 75 sq m, would that be too large for the residents, even if less that 50% of the garden is used?

“Height” – references to height is the height measured from ground level. Note, ground level is the surface of the ground immediately adjacent to the building in question and would not include any addition laid on top of the ground such as decking. Where ground level is not uniform (for example if the ground is sloping), then the ground level is the highest part of the surface of the ground next to the building.

Outbuildings could also include playhouses, pergolas, greenhouses, garages, ponds, sauna cabins, tennis courts and many other kinds of structures for a purpose incidental to the enjoyment of the dwellinghouse. A complete range of external uses in the garden of a home.

The actual legislation refers to buildings. According to Article 2 of the GPDO a ‘building’ is any structure or erection. Decking is considered an outbuilding, however the height of this cannot exceed 300mm. See height above for how this is measured.

 

 

There are only a few basic limitations to outbuildings. You can only cover 50% of the curtilage of the original house, either when built or on 1st July 1948. This maximum includes any other extensions, sheds, decking etc and not just outbuildings.

Depending upon the size of your outbuilding or shed you might require building regs. As long as you do not have sleeping accommodation and is under 15 sq m, then you will not normally need building regs. If the outbuilding is between 15 sq m and 30 sq m and more than 1m from the boundary again you ought to be fine again if it doesn’t contain sleeping accommodation. But you might require it for elements of the outbuilding within these sizes. Outbuildings or sheds larger than 30 sq m, will require building regs. If in doubt check with Building Control.

Note that outbuildings can only be single storey – believe it or not a two storey playhouse for the children will require planning permission!!

 

Maximum size and height of an outbuilding under permitted development

 

There is no maximum size for an outbuilding. However it must remain incidental to the property. At appeal, outbuildings of greater than 100 sq m have been approved, where was ones half that size or less have been refused.

The size of the dwelling, will also have a bearing along with the use of the outbuilding. A 40 sq m playroom for the children might not cut it for example especially on a smaller dwelling!

As far as height is concerned, there is a maximum eaves height of 2.5 metres. If the structure is within 2 metres of any boundary of the curtilage, then this is also the maximum height – i.e. 2.5 metres.

If further than 2m from the boundary, the maximum overall height is 4 metres with a dual pitched roof or 3 metres for any other roof

 

Removal of Class E rights for an outbuilding

 

As with any permitted development right, this permission could be withdrawn due to an Article 4 or a restriction placed by a previous planning decision. If you have a new build, please check the original planning permission as sometimes rights are removed even before the house is built.

If permission has been removed, you might be able to apply for the removal of the condition, via a S73 application. Planning Geek can help with that.

Class E rights are automatically removed if the property consists of one or more flats. This is not defined as a dwellinghouse.

Outbuildings are automatically excluded from listed buildings and their curtilage. Such structures will require planning permission.

If your house has been created via Class G (2 flats above Use Class E), Class M (launderettes & more),  Class MA (Use Class E), Class N (casinos), Class P (storage),  Class PA (light industrial) or Class Q (barns), then I’m afraid you will need planning permission for the outbuilding. Planning Geek can assist you with that.

However, they are not removed from locally listed buildings nor Green Belt areas nor from a house (not flats) created under Class O (offices to resi).

 

Alteration of an outbuilding

 

Class E allows for the alteration of an outbuilding in the curtilage. A recent Inspectorate decision – APP/Z0116/X/23/3331564 –  confirmed that the replacement of a roof covering, cladding, replacement windows etc., would be covered by Class E of Part 1 of the GPDO. The inspector said ‘Class E(a) of Part 1 of Schedule 2 of the GPDO allows the provision within the curtilage of the dwellinghouse of “any building or enclosure, swimming or other pool required for a purpose incidental to the enjoyment of the dwellinghouse as such, or the maintenance, improvement or other alteration of such a building or enclosure.” (my emphasis) ‘

This was an application for a certificate of lawfulness to confirm whether such alterations were included.

The important factor here, was that there was no evidence to prove whether the outbuilding had been erected under Class E – that wasn’t important in the inspectors eyes. He went on to say ‘Therefore, as I have concluded that the appeal building is within the curtilage of the dwellinghouse, and I find that the proposal would not conflict with any relevant limitation set out in paragraph E.1 of the GPDO, the external alterations would be permitted development. I have no information to show that the garage was constructed under Class E, however Class E also applies to alterations of a building within the curtilage of a dwellinghouse.’

 

Sheds and other buildings for HMOs

 

An HMO is a dwellinghouse, therefore in our opinion, all the rules on the page apply to an HMO.

A recent High Court ruling (12th July 2022) backs this up. In London Borough of Brent v Secretary of State for Levelling up, Housing and Communities [2022] EWHC 2051 (Admin), the question arose whether buildings in use as C4 HMOs were “dwellinghouses” for the GPDO.

Deputy Judge, Robert Palmer QC, found that HMOs including both small HMO (Use Class C4) and large HMOs (sui generis), are ‘dwellinghouses’.  In determining the meaning of “dwellinghouse” the Deputy Judge set out legal principles including:

• A dwellinghouse is a unit of residential accommodation which provides the facilities needed for day-to-day private domestic existence (known as the ‘Gravesham test’)
• Whether any particular building is or is not a dwellinghouse is a question of fact
• Use Category C3 is not exhaustive of the uses to which a dwellinghouse may be put
• There is no requirement for a dwellinghouse to be in use by, or akin to, “a single household”. That is a concept confined to Class C3 dwellinghouses
• It is wrong to say that all C4 HMOs are a dwellinghouses for the GPDO, because a C4 HMO may include flats, which are excluded from the definition of “dwellinghouse” in the GPDO

Therefore we firmly believe that Part 1 of the GPDO extends to HMOs.

We also believe that Sui Generis HMOs should also benefit from permitted development rights based on this High Court ruling – but some local authorities might push back on that.

If you are concerned, we would recommend a certificate of proposed use or development. Planning Geek can help you with that. Click here for help.

 

Outbuildings in Conservation areas

 

You can erect a shed, garage or any other outbuilding in a conservation area.

What you must avoid is the area between the side of the property and the boundary. If you wish to erect a garage to the side of a property in a conservation area, you will require planning permission. Planning Geek can help with that. Otherwise move it to behind the house and you are fine. Of course any outbuilding forward of the principal elevation will require planning permission. 

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 outbuilding 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.

 

Outbuildings in National Parks, AONB, WHS etc.

 

You can erect a shed, garage or any other outbuilding in a National Park, The Broads, National Landscapes (AONB) and World Heritage SItes. But there are strict limits.

As with a Conservation Area, you must avoid is the area between the side of the property and the boundary. If you wish to erect a garage to the side of a property in say a National Park, you will require planning permission. Planning Geek can help with that. 

Even if you move it to behind the house you need to be careful. As long as it is not more than 20m from any wall of the main dwelling house, you should be fine. However beyond 20m, then you are limited to an overall footprint of 10 sq m.

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.

Importantly with larger gardens, ensure that the location is part of the curtilage and not garden land. See the paragraph below for more information.

 

Curtilage / Garden Land

 

Any outbuilding must be erected within the curtilage of the property.

The curtilage is the land surrounding the property which is used for the benefit of those living in the house. This might include driveways, lawns, stables (for domestic animals), vegetable patch etc. It is unlikely to contain land that is separate, or paddocks etc., which are not considered part of the dwelling even though they may be linked. A recent court case ruled that land separate from the main garden was not part of the curtilage even though it was used by the family as their ‘garden’. This often applies when the garden is on the other side of a public road. So be careful where you put that shed or outbuilding,

Any land that has been acquired over time, perhaps from fields, is likely to be garden land.  Importantly you cannot erect an outbuilding on garden land or indeed agricultural land, It must be within the curtilage of the dwelling house.

In order for land to change from say agricultural to garden land will require planning permission for change of use. It is only beyond enforcement after 10 years. If you have items previously erected on other land outside of the curtilage, it needs to exist for 10 years before it is safe from enforcement.

Please see our page on curtilage for more information.

 

The front garden!

 

You cannot erect an outbuilding on any land that is forward of the principal elevation. This is usually, but not always, the front garden. If the property is built at right angles, this land might be to the ‘side’ when looking from the road. On an older cottage, which has been built with the rear to the road, you may find that a large chunk of the garden is out of bounds!

Please see this page on the principal elevation and how to confirm which it is. In the event of a dispute with the local authority it is good to know.

However for many dwellings this is obvious. Note that items such as bin or bike stores in the front garden will be considered outbuildings and therefore need planning permission.

 

 

Summary of limits and restrictions on outbuildings

 

Outbuildings or sheds etc. are considered to be permitted development, not needing planning permission, subject to the following limits and conditions:

– No outbuilding on land forward of a wall forming the principal elevation – Outbuildings and garages to be single storey – Maximum eaves height of 2.5 metres – Maximum overall height of 4 metres with a dual pitched roof or 3 metres for any other roof – Within 2 metres of any boundary of the curtilage, maximum height of 2.5 metres in the case of a building, enclosure or container – No verandas, balconies or raised platforms on outbuildings or sheds – No more than half the area of land around the “original house” would be covered by additions or other buildings – In National Parks, the Broads, National Landscapes (Areas of Outstanding Natural Beauty) and World Heritage Sites the maximum area to be covered by buildings, enclosures, containers and pools more than 20 metres from house to be limited to 10 square metres – In National Parks, the Broads, National Landscapes (Areas of Outstanding Natural Beauty), conservation areas and World Heritage Sites, enclosures, containers and pools at the side of properties will require planning permission – Within the curtilage of listed buildings any outbuilding will require planning permission

 

Also see Permitted development rights for householders – Technical Guidance

 

How Planning Geek can help

 

If you find that your outbuilding does require planning, perhaps due to the land designation or removal of Class E rights on a previous planning decision, Planning Geek can assist with obtaining planning permission.

You are welcome to fill in our form here. Please note that if you do not get planning, your structure will be liable for enforcement for 10 years.

If enforcement have questioned an outbuilding, please make contact as we can often assist. You might want to initially book a Zoom call with Ian, the founder of Planning Geek. He can give expert guidance upon what to do next.

 

 

 

Legislation for Class E of Part 1

 

Class E – buildings etc incidental to the enjoyment of a dwellinghouse

Permitted development

E. The provision within the curtilage of the dwellinghouse of—

(a) any building or enclosure, swimming or other pool required for a purpose incidental to the enjoyment of the dwellinghouse as such, or the maintenance, improvement or other alteration of such a building or enclosure; or

(b) a container used for domestic heating purposes for the storage of oil or liquid petroleum gas.

Development not permitted

E.1 Development is not permitted by Class E if—

(a) permission to use the dwellinghouse as a dwellinghouse has been granted only by virtue of Class G, M, MA, N, P, PA or Q of Part 3 of this Schedule (changes of use);

(b) the total area of ground covered by buildings, enclosures and containers within the curtilage (other than the original dwellinghouse) would exceed 50% of the total area of the curtilage (excluding the ground area of the original dwellinghouse);

(c) any part of the building, enclosure, pool or container would be situated on land forward of a wall forming the principal elevation of the original dwellinghouse;

(d) the building would have more than a single storey;

(e) the height of the building, enclosure or container would exceed—
(i) 4 metres in the case of a building with a dual-pitched roof,
(ii) 2.5 metres in the case of a building, enclosure or container within 2 metres of the boundary of the curtilage of the dwellinghouse, or
(iii) 3 metres in any other case;

(f) the height of the eaves of the building would exceed 2.5 metres;

(g) the building, enclosure, pool or container would be situated within the curtilage of a listed building;

(h) it would include the construction or provision of a verandah, balcony or raised platform;

(i) it relates to a dwelling or a microwave antenna;

(j) the capacity of the container would exceed 3,500 litres; or

(k) the dwellinghouse is built under Part 20 of this Schedule (construction of new dwellinghouses).

E.2 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.

E.3 In the case of any land within the curtilage of the dwellinghouse which is article 2(3) land, 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.

Interpretation of Class E

E.4 For the purposes of Class E, “purpose incidental to the enjoyment of the dwellinghouse as such” includes the keeping of poultry, bees, pet animals, birds or other livestock for the domestic needs or personal enjoyment of the occupants of the dwellinghouse.

 

Historic Changes to Class E since 2015

 

6th April 2016:      Inserted Class PA, preventing outbuildings where permission was granted by Part 3, Class PA
1st August 2020:  Inserted legislation blocking dwellings built under Part 20 (airspace)
21st April 2021:    Inserted Class MA, preventing outbuildings where permission was granted by Part 3, Class MA
1st August 2021:  Inserted Class G, preventing outbuildings where permission was granted by Part 3, Class G

 

Updated: 15th April 2025