They overestimated and overcharged when it was obvious that the work they initially described did not have to been implemented. They did not do the work they described in the contract and the work they did do was basically a comedy of errors. They rebuilt a flush well built paver patio with a border that had a five inch gap between the two sides. In addition the patio was not flush with the sides and the pool cleaner they sent left the pool dirtier than when he arrived. Stay far away from this company if you have any sense or concern about quality.