Do I need planning permission?

Do I need planning permission?

What appears to be a simple question isn't straightforward for the Authority to answer. We need to follow regulations, complete history checks and consider various planning rules, and these take time and resources to carry out.

You will usually need planning permission if you want to:

  • Build something new
  • Make a change to your building (for example, an extension)
  • Change the use of your land or building

Some smaller works may be allowed under permitted development rights, but these rights are different in National Parks.

Please refer to our Guides of Types of Alterations below for some general guidelines relating to Householder applications. There is also further information on the Planning Portal or the FAQs on our website.  If you need help with planning terminology, please refer to our glossary.


Guides to Types of Alterations (Householder Only)

This guide explains the most common types of alterations you may want to make to your home and whether planning permission is required.

A Householder Application is the type of planning application you need when making changes to a single dwelling.

Householder applications cannot be used for:

  • Flats or maisonettes
  • Changes of use (for example, converting a house into flats or business premises)
  • New dwellings (building a new house)

Please note, permitted development rights do not apply to listed buildings and may be restricted if your property is in a conservation area.

The information below applies unless permitted development rights have been withdrawn under an earlier planning permission. If permitted development rights have been removed, you may require planning permission for minor changes, alterations or extensions. If you are unsure, we recommend contacting planning@dartmoor.gov.ukto request a Planning Search. This service carries a fee of £60.

▼ Enlargements, improvements and other alterations

You will need planning permission for:

  • Extensions fronting a highway on the principal elevation
  • Any side extensions
  • Rear extensions greater than one storey
  • Cladding the exterior of the house
  • Verandas and balconies
  • Dormer windows
  • Raised platforms more than 300mm high

Other developments may be permitted if the following conditions are met:

  • The height of the eaves of the extensions must not exceed three metres if the extension is within two metres of a boundary
  • Single-storey rear extensions must not extend from the wall of the original house by more than three metres for terraced or semi-detached houses, or four metres for detached houses
  • The extension cannot be higher than 4 metres to the ridge line
  • Materials must be of a similar appearance to existing materials
  • Upper floor windows inserted in side elevations must be obscure glazed and open-able parts of the window must be more than 1.7 metres above the floor
  • Total ground area covered by buildings in the curtilage must not exceed 50 per cent of the curtilage area
▼ Windows and doors

Planning permission is not required to replace or alter the windows and doors of a house in the National Park (including Conservation Areas) – providing the house is not a listed building.

▼ Enlargements by additions or alterations to roofs

You will need planning permission for:

  • All roof extensions, including the installation of dormer windows
  • Other developments, such as roof lights projecting more than 150mm from the surface of the roof
  • Roof lights in side elevations which are open-able below 1.7 metres from the floor or are not obscure glazed
▼ Porches

You will need planning permission for:

  • Porches which are not constructed outside an existing external door
  • Porches greater than three square metres, three metres in height or within two metres of any boundary with a highway
▼ Garden structures (including buildings, enclosures, pools and containers)

You will need planning permission for:

  • Containers with capacity greater than 3,500 litres
  • Structures forward of the principal elevation of the house
  • Structures higher than four metres to the ridge line
  • Structures to the side of the house
  • Verandas and balconies
  • Raised platforms more than 300mm high

Other development may be permitted development if the following conditions are met:

  • Dual-pitched structures, such as a building with a gable-ended roof, must not exceed four metres high
  • Structures within two metres of boundary must not exceed 2.5 metres high
  • Other structures must not exceed three metres high
  • Eaves heights must not exceed 2.5 metres high
  • Curtilage structures greater than 10 square metres and more than 20 metres from any wall of the house will exclude further permitted development under this class
  • Total ground area covered by structures in curtilage must not exceed 50 per cent of curtilage area (excluding house area)
▼ Boundary walls

If adjacent to a highway used by vehicular traffic, you can build a wall or fence without planning permission if it is not more than a metre high. You can build a wall or fence up to two metres high anywhere else without needing planning permission.

▼ Hard surfaces

You will need planning permission for:

  • Non-porous hard surfaces greater than five square metres between the principal elevation and a highway  unless there is a direct run-off to a permeable or porous area in the curtilage

Please note, this applies to the replacement of existing hard surfaces and not just new surfaces.

For more details, please read Communities and Local Government: Guidance on permeable surfacing of front gardens.

▼ Chimney, flue, soil and vent pipes

You will need planning permission for:

  • Installations which front a highway and form either the principal or side elevation

Other development may be permitted if the following conditions are met:

  • Chimney, flue, soil and vent pipes should not exceed one metre above the highest part of roof
▼ Installation, alteration or replacement of antenna (eg. satellite dishes)

You will need planning permission for:

  • Antenna facing onto and visible from the highway
  • Antenna on a building where the building exceeds 15 metres in height
  • More than two antennas

Other developments may be permitted if the following conditions are met:

  • The antenna must not exceed 100cm in length
  • If installed on a chimney, the length of the antenna cannot exceed 60cm
  • Antennas installed on a roof with a chimney must not exceed the height of the chimney or 60 cm above the ridge tiles, whichever is lower
  • On a roof without a chimney, antennas must not protrude above the ridge
  • Where attached to a chimney, the antenna must not protrude above the chimney
  • Antennas must not exceed 35 litres in cubic capacity

So far as is practicable, antennas should be sited to minimise their effect on external appearance of building. For guidance on whether you need planning permission and where you can place your dish check out the Planning Portal’s Antennae Guide.

▼ LPG/oil containers/tanks

You will not need planning permission providing:

  • For domestic heating purposes and the capacity would not exceed 3500 litres
  • It is not sited forward of the principal elevation of the house
  • It is not sited between a side elevation of the house and the boundary
  • It is sited within 20 metres of the rear elevation
  • No more than three metres in height (or 2.5 metres if sited within 2 metres of the boundary)
  • It is not within the curtilage of a Listed Building
▼ Swimming pools

You will not need planning permission providing:

  • It is not sited forward of the principal elevation of the house
  • It is not sited between a side elevation of the house and the boundary
  • It is sited within 20 metres of the rear elevation
  • It is not within the curtilage of a Listed Building
▼ Solar panels

These are allowed on roofs/walls providing they are not installed above the ridgeline of the roof and do not project more than 200mm beyond the plane of the wall or roof surface. In a conservation area, they are not permitted on any wall which fronts a highway and are not permitted if installed anywhere within the curtilage of a Listed Building. Solar panels must be sited to minimise the effect on the external appearance of the building. Listed building consent will be required to install solar panels on listed buildings.

▼ New accesses

The formation, laying out and construction of a new means of access onto a trunk or classified road will require planning permission.

The formation, laying out and construction of a new means of access onto an unclassified road may also require planning permission unless it is required in connection with other, permitted, works on the land.

Planning advice

Our Planning Advice Service is aimed at larger scale proposals that may have a significant impact or where pre-application discussion can have a beneficial impact on shaping development proposals. A small fee will be charged to process enquiries.

Get advice

How do I apply for planning permission?

All you need to know about the application process and next steps.

Apply for planning permission

Thinking of buying a house in the National Park?

What to do if you are considering a potential purchase.

Buying a house

Frequently Asked Questions

Need help? Get answers to our commonly asked questions.

Planning FAQs