At the time of the 1881 census they were lodging at no. 14 and he is listed as a builder, aged 56, employing "2 Wm" (workmen).
Worth mentioning for look-ups in previous census is his son Griffith A. Owen is aged 16 and was born in Beaumaris, Anglesey. You probably now need to look for William in the 1861 census for Beaumaris, Anglesey Will do it later but bit busy at the moment, maybe someone else will assist.
Also Henry Owen, widow, aged 84, born Beaumaris, Anglesey is listed as a Lodger, occ: Clergyman Ch Of England