What are the current construction costs?

Naturally, this can vary, but we have found that most “high design” remodeling costs will vary from $120 to $180 per square of interior space. Additions will vary from $240 to $360 per square foot. Foundation costs will raise costs significantly, so hillside projects with extensive groundwork or retaining walls can increase costs by 20 to 30 percent. Costs on tenant improvement projects can range from $120 per foot to $300 per foot on high-end designs.