T & D Concrete on Rt 466 is about the best you'll find. If you are considering having it installed as part of the construction, you may want to look at having the lanai extended back about 4 or 5 feet. Another thing to think about is having a zone added to your sprinkler system for watering the live plants around the spa on the lanai if you decide to have them. It would certainly be easier than adding it later on. T & D has a division that will also do cleaning and maintenace once a week year around or just when you are away. Turn on the service when you need them - turn off the service when you don't. For a 10 seat spa I think the charge is about $14.50 a week for the weeks that you use them.