Having read the technical guidance on permitted development, there is no reference to 45 degree rule beyond the building position relative to the highway. Herein, does the 45 degree rule apply to single storey extensions?
Basically an imaginary line is drawn at 45 degrees from the mid point of your neighbours nearest windows across the boundary and no part of your proposed extension should cross this line. However this rule, dependant on the site can be flexible and is not applied in all cases.
Also, what is allowed under permitted development? An extension or addition to your house is considered to be permitted development, not requiring an application for planning permission, provided certain limits and conditions are met. No more than half the area of land around the “original house”* would be covered by additions or other buildings.
Keeping this in view, can Neighbours oppose permitted development?
If you know a proposed development may restrict your neighbours right to light, even after planning permission has been granted or you are building under your Permitted Development rights, they have the right to oppose the extension being built.
What is the 25 degree rule?
The 25 Degree Rule of Thumb Suitable daylight for habitable rooms is achieved when a 25 degree vertical angle taken from the centre of the lowest windows is kept unobstructed. See diagram 2. The recommended distance between the buildings is dependent on the opposing property ridge height.
Related Question Answers
What is the 45 degree rule?
They often apply what is called the 45 degree rule which is included in most Councils Residential Design guidelines. Basically an imaginary line is drawn at 45 degrees from the mid point of your neighbours nearest windows across the boundary and no part of your proposed extension should cross this line. How close to boundary can I build?
If you are planning on building an extension of more than one story you cannot go beyond the boundary at the rear by more than 3 meters. This only applies when there is no other property on the land to the rear of your your home. The side boundaries can be built up to but you may need to factor in other considerations. Does the 45 degree rule apply to side windows?
Basically an imaginary line is drawn at 45 degrees from the mid point of your neighbours nearest windows across the boundary and no part of your proposed extension should cross this line. However this rule, dependant on the site can be flexible and is not applied in all cases. Does right to light still exist?
A right to light is protected in England and Wales under common law, adverse possession or by the Prescription Act 1832. Unless your neighbour waives their rights, they are entitled to take action against you. Any kind of development can potentially block the light coming into your home. What is the biggest extension you can build without planning permission?
The permitted development rules have recently been relaxed, allowing you to build an extension without planning permission of up to six metres (or eight metres if your house is detached). Should I object to planning application?
Nonetheless, you can object to any planning application, whether or not you have personally received a letter informing you of it. If you do not have access to the internet, copies of applications should be available for inspection in the Council's Planning Department and are also deposited in some local libraries. What is overshadowing in planning?
Overshadowing. The effect of a development or building on the amount of natural light presently enjoyed by a neighbouring property, resulting in a shadow being cast over that neighbouring property. What do I need to submit for permitted development?
If you are completely sure your project is permitted development you can start your building work. For proof that your building work is lawful you should apply for a lawful development certificate. If your project does not qualify as permitted development you will need to submit a planning application. Do you need prior approval for permitted development?
Prior approval. Certain types of development are granted planning permission by national legislation without the need to submit a planning application. This is known as 'Permitted Development'. What happens if a Neighbour objects to planning?
If you apply for planning permission, a letter will be sent to the adjoining neighbours and a notice will go up outside which will give the public a chance to make comments (objection or support) if they feel they are somehow affected by the proposed design. What size extension can you build under permitted development?
What size extension can you build under permitted development? Typically single storey rear extensions can be up to 3-4m in depth. But in certain situations it may be possible to extend up to 8m without planning permission. How close to a Neighbours window can I build?
They often apply what is called the 45 degree rule which is included in most Councils Residential Design guidelines. Basically an imaginary line is drawn at 45 degrees from the mid point of your neighbours nearest windows across the boundary and no part of your proposed extension should cross this line. How close to my boundary can I build a single storey extension?
Single story extensions to the side of your property to be no more than four meters in height and no wider than half the original size of the property. For those building a double extension on their property, you cannot go closer than seven meters to the boundary. Can I attach a conservatory to my Neighbours wall?
If in the construction of your conservatory you are planning to build against the Party Wall Fence, or will be excavating within three metres of the neighbouring property; you will need to give your neighbours official notice at least two months before the work commences. Can I object to Neighbours conservatory?
If you're the neighbour being notified, you have a duty under the law to not be 'unduly obstructive', so if you have a reason for objecting to the work, it has to be valid, and can't just be that you don't want to put up with the noise of the workmen, for example! Do I need my Neighbours permission to build an extension?
While you should keep your neighbours informed of your plans to extend, there is no legal requirement from the National Building Regulations and Building Standards Act (NBA) requiring home owners to submit or inform their neighbours of their building plan application. What is classed as permitted development?
An extension or addition to your house is considered to be permitted development, not requiring an application for planning permission, provided certain limits and conditions are met. No more than half the area of land around the “original house”* would be covered by additions or other buildings. Can I convert my garage under permitted development?
Planning permission is not usually required to convert your garage into additional living space for your home, providing the work is internal and does not involve enlarging the building. A condition attached to a planning permission may also require that the garage remain as a parking space. How do you check permitted development?
Do double check with your local authority or get confirmation from a qualified surveyor that your proposed works are classed as Permitted Development before you begin. It may be beneficial to submit a prior notification application. What can I build without planning permission?
Garages, sheds and other outbuildings Outbuildings such as sheds, garages, greenhouses and some other structures are also considered to be permitted development. You can build a garage or outbuilding on your property without planning permission as long as it's of a reasonable size – no higher than 4 metres. Can you build right up to your boundary?
There is no right to build astride the boundary if your neighbour objects. If your neighbour does object then you might have to alter your drawings so it is best to check early on. You must also inform the adjoining owner if you plan to build a wall wholly on your own land, but up against the boundary line. What is the difference between daylight and sunlight?
As nouns the difference between sunlight and daylight is that sunlight is all the electromagnetic radiation given off by the sun, especially that in the visible spectrum that bathes the earth while daylight is the light from the sun, as opposed to that from any other source. What does right to light mean?
Right to light is a form of easement in English law that gives a long-standing owner of a building with windows a right to maintain the level of illumination. It is based on the Ancient Lights law. The rights are most usually acquired under the Prescription Act 1832. What is a good daylight factor?
In domestic buildings, it states “ Kitchens achieve a minimum daylight factor of at least 2%; living rooms, dining rooms and studies achieve a minimum average daylight factor of at least 1.5%, and 80% of the working plane should receive direct light from the sky”. Is loss of light a planning issue?
If you cannot make a loss of light or overshadowing objection to a planning application, there are other valid planning objections that may be relevant. These include overlooking or loss of privacy, and loss of public visual amenity. However, loss of view does not count as a valid planning objection. What is vertical sky component?
Vertical Sky Component is a measure of the amount of sky visible from a centre point of a window. A window that achieves 27% or more is considered to provide good levels of light, but if with the development in place the figure is both less than 27% and would be reduced by 20% or more, the loss would be noticeable. How do I object to a Neighbours planning application?
You need to send a letter or e-mail to the Local Planning Authority (LPA) – usually the council – quoting the planning application number and your reasons for the objection. You'll find the number on the letter you were sent or on the authority's website, where you may also be able to leave comments on the application. How many objections do you need to stop planning permission?
However, generally speaking 5 - 10 good objections are often enough to get an application 'called in' to a committee meeting for councillors to decide (although this does differ between local authorities). How is daylight measured?
It is typically expressed in lux (lm/m²). It is the measure of light currently used by most performance indicators to determine daylight availability in the interior. Luminance is the measure of the amount of light reflected or emitted from a surface. What is meant by visual amenity?
LUC's Rebecca Knight considers the growing importance of residential visual amenity as part of environmental impact assessment (EIA) for windfarms. Residential visual amenity means visual amenity from residential properties including their gardens. 
