Christopher Cahill Construction, Inc.

Ask the people who hired Christopher Cahill Construction and one pattern shows up fast: they hire them again. Of the ten reviews on its Houzz page — all five stars, all posted between 2013 and 2016 — most come from repeat clients. One wrote in 2014 that Cahill had done three projects for them after a bad experience with a previous kitchen contractor; another, also in 2014, said they had worked with the firm for fifteen years across several jobs. The company runs out of 71 Main Street in Hollis as a design-build shop, so the drawings and the build come from the same team, and it says the same crew stays on every project. It puts its own tenure at over 25 years. Massachusetts' registry shows its home improvement contractor registration, number 176286, active; New Hampshire does not register general contractors, so there is no state registration to check on this side of the line. Its BBB record is an A+, accredited since 2003. Those 2013–2016 accounts describe the work the firm still lists: whole first-floor renovations, kitchens and baths, family rooms, decks, additions, sunrooms and outdoor living spaces. Several dwell less on the finish than on how the crew behaves in an occupied house — a 2014 reviewer described the team building temporary walls so the family could stay put with a working kitchen, and cleaning the work area at the end of every day. A kitchen-and-bath designer who has worked alongside them wrote in 2014 about their consistency across projects. Two things to raise on the call. The written record is dated — nothing has been posted since December 2016, so ask for references from recent jobs rather than reading them. And BuildZoom shows the company's two EPA renovation (lead-safe) certifications, NAT-84116-2 and NAT-84116-3, as inactive, saying it re-checked one as expired in June 2026, while the company's own site still advertises an EPA green-building certification and the BBB file lists the -2 number. For a firm that restores older New England buildings, that is worth settling before anyone opens a wall in a pre-1978 house. For a design-heavy renovation in southern New Hampshire where you plan to live in the house while it happens, this is a long-established, Massachusetts-registered outfit with a decade of repeat clients behind it — get the current certification status and two recent references in writing before you sign.