What does your contract say? "similar" may be defined. I guess, since your'e asking about retaining counsel now, that you were unrepresented when you entered into this agreement. Aside from defining "similar" the agreement may allow substitutions, at builder's discretion. These are things an attorney might have helped you strike from the agreement or more narrowly define. Retain counsel ASAP. Good luck.
I may be guessing or not licensed in your state. No atty/client relationship exists.