It is understood that Janet Desmond is particularly keen to relocate her husband's drumkit to a chillout room.
One essential that the Desmonds don't have is a swimming pool. However, Building understands that this is shortly to be remedied.
Desmond's luxury makeover puts him more than a decade behind rival porn boss David Sullivan, owner of The Daily Sport.
According to one of the designers who was involved in work on Sullivan's £8m mansion in Theydon Bois, Essex, which was built in the early 1990s, the multimillionaire commissioned an indoor and an outdoor pool. He also installed a spa bath linked to the indoor pool, and for a finishing touch added a two-lane bowling alley.
Three architectural practices were approached by Desmond's project manager last month, leading to Corstorphine & Wright's selection.
The architect and Northern and Shell, Desmond's company, declined to comment.