Granbyâs local economy is primarily a component of residential properties and local businesses. Granbyâs housing base is made up primarily of single-family homes and the average homeownership rate is about 90%. In 2013 the median home price in Granby was $287,800. Granbyâs median home sales price is $30,000 above the median sales price of Hartford County. The Townâs residential component comprises about 94% of its tax base.