At Low Maintenance Landscape, flagstone patio construction work is the best quality you will find.  There are several characteristics to good quality patio; if you scrimp on even one of them, the entire patio is compromised. Our flagstone patios are constructed using  2-3″ thick, high quality hardened sandstone slabs measuring up to 5′ accross. The spacing between stones averages 1/4″ and is constructed on a 6″ thick machine compacted AB-3 and sand base. With your safety in mind, all stones are within 1/8-1/4″ level with each other to avoid trip hazards. This may sound like “too much information”, but it is really critical to get detailed specifications when spending thousands of dollars on a flagstone patio.