Opening a company is usually a lot better for tax purposes depending on the taxable income of the business. As a sole proprietor the income is included in your personal tax which increases significantly.
You can claim a percentage of your house expenses for business based on usage for business or floor area as a sole proprietor, not just as a company.
Just note that if you use a company, it will be taxed at 28% and when you wish to distribute profits, there is another 20% dividends tax on the distribution. The benefit for a small business would be the small business corporation tax rates, which is a sliding scale that depends on your taxable income (usually similar to your profits).