The cost of a home addition can vary significantly based on the size, scope, and complexity of the project, as well as the materials and finishes chosen. The average cost per square foot for home additions in Connecticut is around 500$. On average, you can expect to spend around $300,000 for a home addition. Smaller, simpler additions might start at around $80,000, while larger, more complex projects with high-end finishes can go upwards of $500,000 or more. Factors such as labor costs, permits, and unforeseen structural issues can also impact the final price.