The cost of building an attached garage in Connecticut varies based on factors like size, materials, and features. Generally, a single-car garage may cost $20,000 to $40,000, while a two-car garage can range from $40,000 to $60,000 or more. For precise estimates, consult local contractors and consider your specific requirements. Costs can fluctuate, so it’s wise to get current quotes before proceeding with your project.