Fluffy,
Worthy and all as the contributors and posters to AAM are, you should not seek advice on such a limited assessment nor should you take it!
There are several issuse arising such as:
- what garden area is left
- what height is the garage
- how it is accessed
- what does it look like
- can it be seen from the road
- would it be considered exempted development today
- does it adversely affect other propertie
- does it set an unwelcome precedent
- does it materially contravene or adversely affect the zoning
- does it materially contravene an objective of the developmet plan
All of these factors may be considered by the local authority in assessing any new application and yes, the could in theory refuse it.
However an architect or building professional could possibly issue whats called a "letter of comfort" in relation to the unauthorised garage.
This is sometimes done in cases such as this, where the structure is built more than seven years AND where no enforcement letter or warning letter was issued within the relevant time limit from the date of completion of the works.
One way or another, I think you need to take professional advice and remember that a planner isn't all powerful.
While you can agreea way forward that is acceptable to the local authority with the planner and get a permission from the Council, anyone can object during the application process and then appeal the decision.
ONQ.
[broken link removed]
All advice on AAM is remote from the situation and cannot be relied upon as a defence or support - in and of itself - should legal action be taken.
Competent legal and building professionals should be asked to advise in Real Life with rights to inspect and issue reports on the matters at hand.