Gardendesigns co.uk £949
kitchendesign co uk £1995
Both sold in the last couple of years
So taking into consideration the hyphen and that the non hyphen is being used would agree the ballpark figures of the above poster.
I always value a name up if it can be put on the side of a van for added value to the relevant business, particularly if it's short and sweet and memorable.
That's not so good with hyphens.