The cost to build a custom home in SLO County varies greatly depending on size, complexity and finishes. As of 2024, it is challenging to build a custom home with nice finishes for less than $2,000,000 (not including land). We are often asked, ‘What is the cost per square foot to build a custom home in San Luis?’ The answer to that question also varies wildly. As a general answer, a custom home will likely cost somewhere between $450 - $550 per square foot, not including land; however, that cost could go well over $1,000 per square foot. It is important to clarify what is included in the cost to build a custom home. Are new utilities required? Is landscaping included? A pool? Factors like these, plus unknown site conditions like soils conditions, foundation design, etc. can all make a significant impact on the total cost as well as cost per square foot.