[housecarpenter]

I believe "haitch" is normal in the Republic of Ireland, a shibboleth for Catholicism in Northern Ireland, and common in various odd areas where there's a lot of Irish influence. I'm English but some of my grandparents were Irish Catholics, and I come from Merseyside, where a large proportion of the population has a similar family background, and I say "haitch". But for English-in-England, "aitch" is definitely the more common pronunciation.