I researched several companies before deciding to go with GTA. There were definitely cheaper quotes out there. However, GTA was the most professional in all the companies I met. I was adding a living room addition to my house. Daniel came in and gave me a realistic quote. He assured me that he would keep within my set budget. I am pleased that the job got done within the promised price. There were set-backs and delays, but I've come to realize that in this industry those are things that cannot be controlled. Overall the workmanship was good. The workers were professional. It was difficult to communicate with the daily works as they only spoke Turkish, but the site manager Sermet was always there to answer questions and explain each part. They offer a guarantee and warranty their work, and to date they have honored all of that. For example, the brick work on the patio outside has begun to sink (this is due to the earth settling. The company has promised to come back in Spring to fix this once the earth has completely hardened and settled). My next project will adding on the second floor on top of my current extension and I would have no hesitation to hire GTA again. IF there is any advice in working with them is that they insist on using their own architect. Be sure to ask her a lot of questions as she will only spend just a minimal time with you and then draw the plans. If you are someone who just wants someone else to design your project than that's fine. But if you are like me and have very specifics wants and needs than be sure to be upfront about this with the architect as she is not one to "go the extra mile" for you. That said, GTA is fantastic and Daniel and Sermet are great people to work with. I'm enjoying my new space and it is worth every penny I spent on it.