A full roof replacement means stripping the existing shingles or system down to the deck, checking that deck for rot or soft spots, installing new underlayment and flashing, then laying new roofing material, whether that's asphalt shingles, standing seam metal, or a low-slope membrane on a flatter section. New construction installation follows the same steps without the tear-off. This is different from a patch or repair job: it's a full-day-to-multi-week project involving permits, dumpster rental, and crews working on your roof deck, so the contractor you pick matters more here than for a small fix.
What to check before you sign a contract
Ask for proof of state licensing and insurance (both liability and workers' comp), a written manufacturer warranty on materials, and a separate workmanship warranty from the contractor. Get a detailed estimate that breaks out tear-off, decking repairs, underlayment, ventilation, and flashing work rather than one lump number. Waterbury's older housing stock and hillside lots mean steep or complex rooflines are common, so ask specifically how the crew handles valleys, chimneys, and skylights.
How we rank these 72 contractors
Our scoring weighs verified licensing, review volume and consistency, response time, and how often a company shows up doing actual replacement work versus repairs only. For a shortlist built from that data, see our ranked guide to Waterbury roofing contractors. The full scoring criteria are explained on our methodology page.
