Roofing in Minneapolis is an ice-dam city as much as a snow-load city, and the leak it makes gets mistaken for plumbing. Attic heat from a long run of furnace time melts the pack, the eave refreezes it, and water backs into a plaster ceiling on a day with no rain. Bungalow ridges and rambler valleys hold that dam. A bathroom fan dumped in the attic is a common reason the deck stays warm. If the faucets are dry and the ceiling is wet, start here.
Icicles over the walk, a stain that grows in bitter weather, and a damp soffit are the pattern. Pipe boots go brittle. Chimney flashing on older brick opens at the thaw. Granules in the gutter are not the lead story the way hail is on the open prairie. Soft deck under the eave is structure. A north slope will keep the dam after the south slope has cleared. Name the slope you can actually see from the yard.
Ventilation and bypasses decide next winter. A leaky attic hatch, buried baffles, and can lights that pierce the lid rebuild the dam after new shingles. Say what you know, including if you have never opened the hatch. Snow sliding off a steeper porch roof onto a lower one can puncture it. Metal edge lifted by wind is a different repair from the ice line. Both can be true. Do not chip the dam into the shingles and call it fixed.
Scope includes ice protection at the eaves, flashing, underlayment, and a real path for melt. Debris has to leave a tight lot. Temporary cover matters when a thaw shows up before the work can finish. Keep people off a loaded slope. If an addition over cold air is the piece that dams first, say so. That addition is also where supply lines like to freeze, but the ceiling stain is still the roof until a pipe proves otherwise.
Say ice dam or a leak you can point at, and name the floor with the stain. Say whether the attic feels warm. Minneapolis will reload the eave while the heat stays on. Call the number on this page.