Wind Turbine Planning Permission in Wales

In Wales, one stand-alone wind turbine at a home can be installed without a planning application, provided every limit and condition in the Welsh permitted development rules is met¹. The right comes from Class H of the Welsh permitted development order and covers the installation, alteration or replacement of a stand-alone turbine within the curtilage of a dwellinghouse or a block of flats that consists wholly of flats². The headline limits are a maximum height of 11.1 metres to the top of the blades, a blade swept area of no more than 9.6 square metres, and a boundary rule that pushes the turbine well back from the edge of the property¹.

The most important difference from England is that building-mounted turbines have no permitted development rights at all in Wales: a turbine fixed to your house or to a building within its curtilage always needs a planning application¹. England, by contrast, allows building-mounted turbines under permitted development within its own limits³. Wales also allows a larger blade swept area for stand-alone turbines than England does, which is worth knowing if you are comparing advice written for the two countries¹.

What Class H allows in Wales

Class H of the Town and Country Planning (General Permitted Development) Order 1991, as amended for Wales by the Town and Country Planning (General Permitted Development) (Amendment) (Wales) Order 2012, grants planning permission for the installation, alteration or replacement of a stand-alone wind turbine within the curtilage of a dwellinghouse or a block of flats². "Stand-alone" means a turbine that is not attached to a building: a pole-mounted machine standing in the garden or grounds. The right covers alteration and replacement as well as first installation, so a like-for-like swap of an existing permitted turbine can also proceed without an application, provided the limits are still met².

The right is conditional from the outset. Development is not permitted by Class H unless the turbine complies with the MCS Planning Standards or equivalent standards². The same requirement appears in the legislation that introduced these rights, which ties permitted development to certified products and installers rather than to any turbine a householder might buy⁷. The Welsh conditions also require the blades to be made of non-reflective materials, require the turbine to be sited so far as practicable to minimise its effect on the amenity of the area, and require it to be removed when it is no longer needed for or capable of microgeneration⁶.

A block of flats qualifies only if it consists wholly of flats: a building that also contains commercial premises is outside the right¹. And the right belongs to the property, not to the householder: only the first installation of a wind turbine is permitted development, and only where there is no existing air source heat pump at the property¹.

Freestanding turbines: height cap of 11.1 m, 9.6 m² blade area and boundary clearance

The size limits for a stand-alone turbine in Wales are fixed and unforgiving. The highest part of the turbine, including the blades, must not exceed 11.1 metres, and the swept area of any blade must be no more than 9.6 square metres¹. The swept area is the circle the blades sweep as they turn, so it is a function of blade length rather than of the machine's rated power: a turbine with long, slender blades can breach the limit while a smaller rotor on a taller pole does not.

The boundary rule is the one that catches most sites. An installation is not permitted if any part of the stand-alone turbine, including the blades, would be closer to any point along the property boundary than a distance equivalent to the overall height of the turbine plus 10 per cent of that height¹. The clearance is measured from the boundary to the nearest point the blades reach, not to the pole, and it scales with the machine's height: the taller the turbine, the more land it must stand clear of. On a small suburban plot the rule can rule out permitted development entirely, whatever the turbine's size, because the fall zone of the machine must fit inside your own land.

Two further siting limits apply. The distance between ground level and the lowest part of any blade must not be less than five metres, which keeps the turning rotor out of reach of people and animals⁴. And the installation must not be sited on safeguarded land, the land around airports and similar sites where tall structures are restricted⁴.

The Welsh swept area limit of 9.6 square metres is more generous than the English figure of 3.8 square metres, which appears in the English Class H and in guidance written for England⁸. The height limit of 11.1 metres is shared. If you read advice giving a 3.8 square metre limit, it was written for England; in Wales the larger swept area is allowed¹.

Roof or wall mounted wind turbines: Wales excludes them from permitted development

This is the sharpest difference between the two countries. In Wales, permitted development rights do not apply to wind turbines mounted on a dwellinghouse or on a building within the curtilage of the dwellinghouse¹. If you want a turbine on the roof of your house, on a gable wall, or on the roof of your garage or outbuilding, it will be necessary to make a planning application to your local planning authority¹.

In England, by contrast, building-mounted turbines can be permitted development. The English rules allow an installation on a detached house, not a block of flats, or on other detached buildings within the boundaries, subject to limits: no part including the blades may protrude more than three metres above the highest part of the roof excluding the chimney, and the whole assembly must not exceed 15 metres in height including the building, hub and blade, whichever is the lesser³. The English rules also cap the swept area at 3.8 square metres, require a five metre clearance between ground level and the lowest blade, and require no part of the turbine to be within five metres of any boundary³.

A householder in Wales who reads English guidance on roof-mounted turbines, including most of what appears on national planning advice sites, will be misled: those pages state that their guidance relates to the planning regime for England and that the policy in Wales may differ³. In Wales it does not merely differ, it is absent. The practical consequence is that the roof and building-mounted turbine route in Wales carries the cost, delay and uncertainty of a full application, which is one reason pole-mounted machines dominate the Welsh domestic market. For what a mounted machine can and cannot deliver, see our page on domestic wind turbines.

The conditions attached to permitted development rights

Meeting the size and distance limits is necessary but not sufficient. The Welsh conditions attach to the right itself, and a breach of any one of them removes permitted development status, leaving the installation unauthorised.

• MCS Planning Standards. Development is not permitted unless the stand-alone turbine complies with the MCS Planning Standards or equivalent standards².
• Non-reflective blades. The blades must be made of non-reflective materials, to avoid glint and flicker disturbance to neighbours⁶.
• Siting to minimise effect. The turbine must be sited, so far as is practicable, to minimise its effect on the external appearance of the building and the amenity of the area⁶.
• First installation only. Only the first installation of any wind turbine is permitted development, and only if there is no existing air source heat pump at the property¹.
• Removal when redundant. The turbine must be removed as soon as reasonably practicable when it is no longer needed for or capable of microgeneration⁶.

The air source heat pump condition deserves attention because it works in both directions. Permitted development for an air source heat pump is not available if a wind turbine is installed on the same building or within the curtilage of the dwellinghouse or block of flats, and the turbine right is likewise unavailable where a heat pump is already present⁹. A household planning both technologies needs to think about the order of installation, because whichever goes in second will need a planning application¹⁰. Wales also runs its own permitted development rules for air source heat pumps, with a minimum three metre boundary distance intended to reduce noise pollution potential¹¹, and heat pump installations must comply with the Building Regulations in Wales¹².

Certification under MCS 020 and using an accredited installer

The MCS Planning Standards condition is not a formality. Development is permitted only if the stand-alone turbine installation complies with the Microgeneration Certification Scheme Planning Standard, MCS 020, or equivalent standards¹. The scheme's role is set out plainly in national guidance: one of the limits of permitted development rights for wind turbines and air source heat pumps is that equipment must be installed by an installer who has been certificated through the scheme, using a certificated product⁵.

For a householder this means two checks before ordering. First, the turbine model itself must be a certificated product; a cheap imported machine with no certification takes the installation outside permitted development however small it is. Second, the installer must hold the relevant certification. The MCS 020 standard exists to give planning authorities confidence that certified installations meet the siting and safety assumptions behind the permitted development right, which is why compliance is written into the legislation rather than left to guidance².

The same certification matters beyond planning. If the turbine is attached to your house, work on the electrical side can be self-certified by an installer registered with the relevant competent person scheme, listed in Row 17 of Schedule 3 of the Building Regulations, without involving local authority building control; if the turbine is not attached to the house, only the electrical installation and connection are captured by the building regulations¹³. Certification also underpins the standards a small turbine must meet, covered in more detail on our small wind turbine standards and MCS certification pages.

Situations outside permitted development

Certain land and buildings are excluded from the right altogether, whatever the turbine's size.

• Within the curtilage of a Listed Building. Permitted development rights do not apply to a turbine within the curtilage of a Listed Building¹.
• Areas of Outstanding Natural Beauty, World Heritage Sites and sites of special scientific interest. The Welsh guidance excludes turbines within these designated areas¹. English guidance frames the same exclusion as Listed Buildings, Scheduled Monuments and designated land other than Conservation Areas, with designated land defined as national parks and the Broads, Areas of Outstanding Natural Beauty and World Heritage Sites⁴.
• Safeguarded land. The installation must not be sited on safeguarded land⁴.
• Conservation Areas. These are treated differently: rather than being excluded outright, a stand-alone turbine in a Conservation Area is not permitted if it would be nearer to any highway bounding the curtilage than the part of the house or block of flats nearest to that highway⁴.

The Conservation Area rule is a siting restriction rather than a blanket ban, so a turbine placed behind the house, further from the road than the nearest part of the building, can still be permitted development in a Conservation Area if every other condition is met⁴. Listed Building curtilage is different in kind: it is an absolute exclusion, and a turbine there needs not only a planning application but, in appropriate cases, Listed Building Consent, a point covered on our Listed Building consent for microgeneration page.

Cases requiring a full planning application

Outside the permitted development right, the default is a planning application to your Local Planning Authority. In other cases, you will need to apply for planning permission from your local authority to add a domestic wind turbine to your house or the grounds surrounding your home¹⁴. A full application is needed when any limit or condition is not met, or when permitted development rights have been removed in the area, for example by an Article 4 direction¹⁴.

In practice the application route is triggered by the most common features of Welsh plots and buildings:

• a turbine mounted on the house or any building in its grounds, which has no permitted development right in Wales¹
• a second turbine at a property that already has one¹
• a turbine at a property that already has an air source heat pump, or a heat pump where a turbine is already installed⁹
• a stand-alone turbine taller than 11.1 metres, with a swept area over 9.6 square metres, or closer to the boundary than its height plus 10 per cent¹
• a site within the curtilage of a Listed Building, an Area of Outstanding Natural Beauty, a World Heritage Site or a site of special scientific interest¹

Welsh policy is relevant to how such an application is handled. The Welsh Government's renewable energy planning policy work has considered thresholds for renewable energy developments, citing for example 5MW, and has set a direction that by 2025, where renewable energy planning applications have a mandated statutory time allocation, decisions should be delivered within it¹⁶. A single domestic turbine is far below any such threshold, but the policy climate is one in which small renewable applications are expected to be determined promptly.

Submitting an application to your Local Planning Authority

Your Local Planning Authority is usually the planning department of your local council, and for queries about a particular case the first thing to do is to contact it¹⁷. The standing advice is to always check with your Local Planning Authority about planning issues before you have a system installed¹⁵. This is not a courtesy call: the authority holds the local knowledge of designated land, Article 4 directions and conservation area boundaries that decides whether your proposal is permitted development.

Many authorities offer a pre-application service, which offers the opportunity to discuss your options and get guidance from planning officers¹⁸. Local authorities may charge a fee for pre-application advice, so check the position with your own council before booking⁴. For a turbine, where the boundary rule and the siting condition can turn on a metre or two, a pre-application discussion with a sketch and measurements can be the difference between a confident installation and a refused application.

Two practical notes on capacity. The government has announced that it will recruit 300 new planners, and local planning authorities are also facing resourcing issues for roles which assist planners, such as ecologists and drainage engineers¹⁹. What that means for a householder is that determination times vary between authorities, and a well-documented application with a clear site plan and boundary measurements helps your case move without requests for further information.

If your turbine is permitted development, keep a file: the turbine's certification, the installer's certification, the height and swept area figures, and a plan showing the boundary distance calculation. If the council ever questions the installation, that file is what demonstrates the right applied.

Welsh policy background and how the rules diverge from England

The structural difference has already been stated: Wales grants permitted development only for stand-alone turbines, while England grants it for both stand-alone and building-mounted machines¹. The swept area limit also differs, 9.6 square metres in Wales against 3.8 square metres in England¹. National planning guidance pages are written for England and carry the caveat that the policy in Wales may differ, so a Welsh householder should treat English guidance as background only and work from the Welsh order and the Welsh Government's own advice⁴.

Scotland runs a different system again, and the contrast is instructive. Scottish Class 6G permits a free-standing micro wind turbine within the curtilage of a dwelling with a blade tip height not exceeding 15 metres and the lowest part of the blade at least 5 metres from ground level, and Scottish Class 6HC permits a turbine on a detached dwellinghouse, with no part protruding more than 3 metres above the highest part of the roof excluding the chimney and a swept area of no more than 4 square metres²⁰. Scotland also operates a prior approval mechanism for free-standing turbines, under which the planning authority must be asked to determine whether its prior approval is required for the siting, design, size and external appearance of the proposed turbine²¹. Wales has no equivalent prior approval step for domestic turbines: it is either permitted development outright, or a full application.

Within Wales, the policy direction is expansionary. The Welsh Government's work on preparing Wales for renewable energy to 2050 sets the framework within which domestic installations sit, and its separate review of air source heat pump noise and permitted development shows the rights being actively revisited rather than settled¹⁶. A householder installing now should re-check the limits with the Local Planning Authority at the time, because the 2012 order has been amended before and the policy work is live.

How the rules affect your energy self-sufficiency

A permitted development turbine in Wales is one of the few additions to a home that increases generation without increasing your dependence on anyone's permission, once it is up. The conditions, though, tell you where the dependence sits. The MCS 020 requirement ties the right to certified products and installers, so the route is closed to uncertified equipment². The first-installation-only rule and the air source heat pump exclusion mean the right is rationed: one machine, one property, and a planning application for anything more¹. The removal condition means the right is a licence for as long as the turbine is needed, not a permanent change to the land⁶.

The boundary rule is the real constraint on output. A turbine must stand its own height plus 10 per cent clear of the boundary, which on many Welsh plots caps the machine well below the 11.1 metre limit and pushes it toward the siting and wind speed compromises that determine whether a domestic turbine earns its keep. A turbine squeezed low and close to the house, in the wind shadow of its own roof, will not deliver what the same machine would on an open site, and the rules give no relief for that.

What the rules do not touch is the grid connection. Planning permission, permitted or otherwise, is separate from the connection agreement under G98 and G99, and from any arrangement for exporting electricity. A Welsh household can be fully within its permitted development rights and still dependent on its distribution network operator for the connection that lets surplus power leave the property. The planning rules open the door to generation; the independence a household actually gains depends on the site, the machine and the connection, not on the permission alone.