Deck builders in Hennepin County, MN

Hennepin County has about 571,527 homes, with a median construction year of 1973 (the Minnesota median is 1979). Within our covered ZIP codes — about 571,593 homes — the median is 1973, close to the county as a whole.

Homes in the covered parts of Hennepin County have a median construction year of 1973, so a deck original to a typical house would now be about 53 years old — beyond the point where wood framing, fasteners and flashing can be assumed sound.

Many decks from the 1970s and 1980s were built before today's detailed deck provisions appeared in model codes. Common issues on decks of this age include corroded hangers, posts set directly in soil and ledger boards fastened with nails. Replacement is often the better value than repeated repairs.

Oldest housing: Minneapolis (1969), Minnetonka (1972) and Mound (1974). In these communities, expect retrofit decks on older houses and aging decks that need structural inspection, ledger and flashing upgrades, or replacement. Newest housing: Dayton (2011), Rogers (2003) and Hamel (2003). Here, projects lean toward enlarging builder-installed decks, adding stairs and railings, and upgrading to low-maintenance boards.

The nearest NOAA climate station with 1991–2020 normals is Lower St Anthony Falls. It records an average of 147 days a year with a low at or below 32°F — a long, hard freezing season. On roughly 75 of those days the temperature climbs back above freezing, so water in wood, soil and gaps between boards repeatedly freezes and thaws.

For Hennepin County, that means footings must bear below the locally required frost depth to avoid heaving, and wood surfaces should be kept sealed so absorbed water doesn't split boards over winter. Synthetic decking tolerates freeze-thaw well but still needs the manufacturer's expansion gaps.

Snow is a major factor: the New Hope station averages about 54.3 inches a year. Framing has to carry snow load, stairs need a plan for winter use, and snow removal should be done with plastic-bladed shovels and ice-melt products the decking manufacturer allows.

Precipitation averages about 34.7 inches a year, falling on about 65 days with 0.1 inch or more — wet enough that drainage and flashing still matter, but dry spells also let wood surfaces dry out and check in the sun.

Average summer highs reach about 81°F, and around 18 days a year top 90°F. On a deck with full afternoon sun, dark composite can get uncomfortable on those days, so test samples in the sun before choosing a color.

• Retrofit decks on older homes: about 264,372 homes (46%) predate 1970. Here the priority is confirming that add-on decks are properly attached — or rebuilding them freestanding — before any cosmetic work.
• Replacement and major repair: about 198,000 homes (35%) were built between 1970 and 1999, the age group whose original or early add-on decks are most likely to have worn-out framing, connectors and boards.
• Upgrades and expansions: about 62,051 homes (11%) were built since 2010. Their decks are usually sound but small or builder-grade, so enlarging the deck, adding stairs and switching to composite or upgraded railings are common.

52% of Hennepin County's homes are detached single-family houses and 8% are townhouses or other attached homes; 63% of occupied homes are owner-occupied. With mostly detached homes, wood remains a practical lower-cost option for homeowners willing to clean and seal on schedule.

Minnesota has a statewide building code administered by the Department of Labor and Industry and enforced by municipalities that have adopted it. Before work starts, confirm with the building department for your exact address whether a permit is required, what drawings and inspections it involves, and whether an HOA must approve the design.