Hi George,
Yes, this expense is tax deductable in the year it was done and paid for. It must be used solely for business purposes otherwise only a portion will be deductable. This expense is called a "capial expenditure" and will be amortized over a specified number of years but remember that when you sell this home it will be added back to the net capital gain and the adjusted cost basis for the new home will be lower. This isn't a problem unless you have a home worth more than the exclusion allowed for the taxpayer, depending on marital status.