Chimney and fireplace work in Minneapolis

The 2024 American Community Survey counts 42.8 percent of the city's 209,080 housing units as built in 1939 or earlier, close to four times the national share of 11.7 percent, and puts the median Minneapolis home at 1951. Another 8.1 percent of units sit in two-unit buildings, so a single stack often carries the flues for two households. Gas heats about 70 percent of occupied homes and wood less than one in 500, which means the old chimney on most blocks now vents a furnace or a water heater more often than it vents a fire.

That shift matters here more than almost anywhere. Minnesota's fuel gas rules (Minn. R. 1346.5501) call for an approved metal liner in any masonry chimney that vents a gas appliance, and they bar hooking any appliance into a flue that serves a fireplace. A chimney built for coal a century ago was not designed around the cool, wet exhaust of a modern gas appliance. At the free inspection we look at every flue from the roof and from the basement, photograph what we find and write out the cost before anyone picks up a tool.

The furnace swap that strands a water heater

A common Minneapolis story goes like this: the old furnace is replaced with a high-efficiency unit that vents out the side wall through plastic pipe, and the gas water heater is left by itself at the bottom of a chimney sized for both. A small, cool exhaust stream in a big, cold brick flue condenses on the way up. The fuel gas code adopted in Minnesota (IFGC 501.15) says a chimney must be resized when an appliance is permanently disconnected from it, so it can control condensation and still draw.

The usual answer is a liner sized to the water heater. An aluminum liner for gas appliances typically runs $625 to $2,250 and a stainless steel liner $900 to $3,800. In a duplex where both units' furnaces and water heaters share one stack, we map which appliance feeds which flue before quoting anything. The city says most heating and gas work needs a mechanical permit, and Development Review answers questions at 612-673-3000; we check what your project requires before work starts.

• Rust flakes or white staining at the base of the chimney
• A water heater that back-drafts when the bath fan runs
• A clay liner with cracked or missing tiles
• Two furnaces from a duplex sharing one flue

Prospect Park, Homewood and the city's preservation review

Minneapolis has 83 official neighborhoods in 11 communities, and several carry historic designations that reach the roofline. Prospect Park was platted in 1885 and filled in slowly into the 1910s because of its hills; its residential historic district joined the National Register in 2015, and its Queen Anne and Colonial Revival houses sit below the 1913 water tower on Tower Hill. On the North Side, the Homewood Historic District in Willard-Hay was designated by the city in February 2017.

On a designated property, chimney work goes through the city's preservation review before it starts. The city says staff review can take several weeks, with a decision email about ten business days after a complete application. We check whether your address is designated before we quote, and we help you prepare the photos and the written scope the city asks for.

147 freezing nights and the top of the stack

NOAA's 1991–2020 normals for the MSP airport list about 147 nights a year at or below 32°F, roughly 22 nights at or below zero and about 51 inches of snow. Subtract the days that never get above freezing and you get about 75 days a year when the temperature crosses the line both ways, each one a chance for water in a crack to freeze and widen it. The MN DNR recorded −28°F at MSP on January 30, 2019, and the 1991 Halloween Blizzard dropped 28.4 inches, still the station's largest single storm.

Those cycles show up first on the crown, the concrete top of the chimney, and in the mortar just below it. The current Minnesota Residential Code describes the crown as a sloped concrete, metal or stone cap with a drip edge and a caulked break around the liner, which many early crowns never had. Crown crack repair typically runs $200 to $700+, a new crown with a drip edge $1,000 to $3,000, and tuckpointing $500 to $2,500.

Where we work in Minneapolis

Linden Hills · Kenwood · Lowry Hill · East Isles · Tangletown · Lynnhurst · Fulton · Armatage · Longfellow · Seward · Powderhorn Park · Prospect Park · Marcy-Holmes · Audubon Park · Windom Park · Willard-Hay