...So four years ago the wife and I buy a wonderful little 11 year old single in Bucks County, PA with a great flagstone patio in the back (2 levels, about 380 square feet total). Not sure when it was put in, but by the second year of our living there (when the house was 13 years old) the mortar in between the flagstones starts cracking and breaking off. I later found out that the flagstones were either placed without any adhesive, or they may have been glued down with an inferior, too-watery mortar mix. Those flagstones with no mortar around them can easily be lifted. Underneath is a crumbling layer of mortar (or something), on top of probably about 2" or 4" of solid (hopefully intact) concrete. So now I'm getting estimates for removing the rest of the mortar; diagramming, numbering, and taking up the flagstones; scraping out the crumbling mortar underneath to reveal the concrete base; adding 2" of fresh concrete; applying adhesive to and placing all of the flagstones back on top; and remortaring. One guy who works for a local company and spent about 20 minutes looking at the patio quotes me about $4,000. Another, who works on his own, spent a good 45 minutes, went in detail about what the job entails, came back to me with a quote of $7,100. Somethin' ain't right. I certainly don't want to get taken, but I have more confidence in the more expensive guy. Does his estimate sound way too high? The price includes only labor - I'm told that I'll have to pay extra to replace any flagstones that are taken up but break when the adhesive is applied - the flagstones are only about 3/4" thick and many have spent a year soaking in mortar mush below without any mortar in between flagstones. Access to the site is easy - level ground, grass, non-fenced-in yard, and wide - about 20 feet between houses. How much would you charge?