You have at least four attributes in your description that will challenge building in the $85/SF 2600 SF range in Frisco. 1. "Custom" is a loaded word, but any home built to your own "layout" will limit the builders who will work with you. 2. "Decent lot size" mean a premium lot in any neighborhood. Add $5,000 to $15,000 or more depending on the builder and location. 3. 2600 square feet increases the price you pay per square foot. The smaller the house, the more it will cost per square foot. 4. Construction - Brick is standard. Stone accents are upgrades. Typically $3000 to $8000 for a stone accent on the front elevation. High energy efficiency - Most builders build in a good level of energy efficiency. It is require by current codes. Additional elements to consider are reflective material on roof decking or in the attic, higher R values on insulation, and 18 SEER air conditioning. More $$$.
New construction in Frisco for builder spec homes on standard lots is running $80 to $95 per sq ft for a 2600 to 3000 sq ft home. My best recomendation is contact a REALTOR. We can do a lot of the leg work for you, represent your interest in negotiating with a builder, and best of all, our commission doesn't increase what you pay for the home. Our fees are paid for from the builder's advertising dollars. Our commission does not affect what you pay for the house, but our experience will save you money. Give me a call. I'm here to help!