A spa with a ledge isn't a problem, we can custom make a cover for you.
You measure the spa as you would normally using our measurement sheet and handy video below.
Once this is complete, please email the measurement sheet back to email@example.com with a picture of your spa clearly showing the ledge.
You will need to advise us that you have a hob style spa lip.
Then when your cover is made, the straps are placed on the outside of the cover rather than under the skirt. This will allow the straps to clear the ledge and attach to the lock, while still giving you a well fitting cover.