Before you start work
There are many types of alterations and additions to houses for which you do not need to apply for planning permission. Whether or not you apply for permission, you should consider the following points beforehand.
Inform your neighbours about work you intend to carry out to your property. They are likely to be as concerned about work that could affect them as you would be about changes which could affect your enjoyment of your own property. For example, your building work may take away some of their light or spoil a view from the windows of their property. If the work you carry out seriously overshadows a neighbour's window which has been there for over 20 years, you might be affecting his/ her "right to light" and you could be exposed to legal action. It is best to take the advice of a lawyer if you need any advice regarding this matter.
If you are required to make a planning application for the work you want to carry out, the council will request the opinions your neighbours.
You may be required to get someone else's agreement before commencing some types of work,due to conditions in your lease, covenant or other restrictions in the title to your property. This may be required even if you do not need to apply for planning permission. You can check this yourself or consult a lawyer