Hello
If you contact your local council they will tell you , I believe if its a garage you just need to make them aware, unless its going to be bigger than a standard size single garage I don’t think you need planning but they will tell, if your neighbours have what your planning I don’t think your have any problems, but then this is thinking your having it at the back of your house and not the front, if its the front I believe you have to have planning
Nicky