Hi
Just had a look in other indexes and I have only found one mention of Owlet Hall and that was the address given on William Firth's burial in Kirkheaton on the 8 November 1861.
A few years later I think his wife Mary Firth was buried in the same grave on the 14 April 1876, but her address was Nettleton, Dalton.
Nettleton Road isn't far from Cold Royd and there are only a few old buildings left in this area and they are old farms so it could have been the name of an old farm.
If you google map and put Nettleton Road, Huddersfield it will give you an idea where it was. (The old farm I am think of is towards the end of Newland Road.)
John