Sadly it hasn't. I had heard a rumour it was going to be made into a movie around 7 years ago or something like that, but nothing ever materialised.
As of my knowledge cutoff date in September 2021, The Magic Cottage by James Herbert has not been adapted into a film. However, the possibility of future adaptations cannot be ruled out.
Magic - novel - was created in 1976-08.
yes there is magic in this novel woth illusions and magic tricks. yes there is magic in this novel woth illusions and magic tricks. yes there is magic in this novel woth illusions and magic tricks.
Industrial Magic - novel - was created in 2004.
Dark Magic - novel - was created in 2000.
The Magic City - novel - was created in 1910.
The Magic Christian - novel - was created in 1959.
Industrial Magic - novel - has 528 pages.
Dark Magic - novel - has 368 pages.
The Magic City - novel - has 333 pages.
The Magic Christian - novel - has 148 pages.
The Magic Faraway Tree - novel - was created in 1943.
No, "The Lakeside Cottage" by Susan Wiggs is not part of a series. It is a standalone novel.