You decide! Did you recently purchase the property and do extensive renovations, or has the property increased in value due to increased demand? These are examples of things that can influence your asking price. Tips: Check your area for houses for sale and see if they're comparable. In the Netherlands, you can find out how much similar properties have sold for through the Land Registry. An independent appraisal agency can always prepare a valuation report. A sales expert can also work with you to prepare a valuation.