Your capital gain will be calculated based on the difference between the adjusted cost base and the selling price. Note that only 50% of the gain is taxable.
Normally, the adjusted cost base of the property is the original purchase price plus other costs incurred to make the acquisition, such costs are brokerage fees, installation costs, legal fees and the land transfer taxes. If you make any home improvements like additions or renovations through the period which you owned the house, they will increase the house value hence the costs incurred can be also added to compute the adjusted cost base.
