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Based on only 5 of 43 Google reviews — a small sample — the single most decision-relevant pattern is that every customer who mentioned being nervous about engaging a builder (several had bad prior experiences) describes the outcome as genuinely stress-free, not just satisfactory. The standout practical differentiator is their quoting model: James provides preliminary designs at no charge before any money changes hands, which is unusual in the second-storey addition space and consistently cited as the reason families chose Keystone over competitors.