#1 I feel this is the only logo that conveys the essence of the business. I don't care for the stairs, but I feel the integration of a graphic or icon is needed to convey the nature of the business.
I would also like to see if there is a way to amplify the two words found in Constructure. Construct and Structure. Depending on how you look at the word, you could see both words. If these words could compliment each other in a visually unique, engaging way, it would be great!