Small engineering consulting business focused on facility related engineering solutions like energy audits, mechanical design, condition assessments, and facilities operations.
Colors can be 2 or maybe 3. They will need to work with future web site and business cards on on white or light gray background.
Would prefer not want ot use symbols of buildings or structures. May or may not use tag line in logo - depends if it looks clean. The "PLLC" can be slightly smaller font similar to business that use LLC, INC, LLP.
Not sure if a triangle symbol will work since there are so many already. Try it if looks professional