I've lived in Calow  all my life, but never known a "Calow House" as such.
Try & tell me where it was/is & I'll see what I can do.
For what its worth, I live on Dark Lane Calow as a reference point.

Thanks, Scimitar. I'll try to give some better coordinates but haven't got the original census copy from 1841, just my handwritten details. I'm not sure whether the house was rented or owned by my ancestor. Two other Denham ancestors were baptised in Calow (William and Samuel Denham). I think they became auctioneers and lived finally in Hasland.

Thanks for your welcome, Fly and Old Cruser. If I wasn't living in The Antipodes (Queensland, Australia), I'd be up there with my opposition placard. I visited Calow in 1979 and managed to take a few pics of Somerset House. It's such a fine building and I hope you're right that they'll have to follow strict building regulations. Even over here the developers are knocking a lot of the old buildings down and putting up ugly commercial premises. My great grandmother lived in what was Hasland House (now Eastwood Park); another old demolished house. Another house where ancestors lived was Calow House; does anyone know if that still exists? As you've probably  guessed I love family history and am very proud of my Derbyshire roots. If only we could keep what's left of that earlier time 

I can't believe that Somerset House is going to be taken over by Tesco. My 3rd Great Grandparents (Denham's) lived in Somerset House in the early 1800's. Such a shame to think that such a fine building will have such tacky connotations. I hope it doesn't happen and if it does, that the building will be preserved.