Deck builders in Cobb County, GA

Cobb County has about 314,104 homes, with a median construction year of 1990 (the Georgia median is 1992). Within our covered ZIP codes — about 315,546 homes — the median is 1990, close to the county as a whole.

The median home in the covered parts of Cobb County was built around 1990. A deck built with a house of that age is now about 36 years old — the stage where first-generation pressure-treated decks commonly need major repair or replacement.

Decks built before 2004 were very likely made with CCA-treated lumber, which was phased out of most residential uses at the end of 2003. That doesn't make an existing deck unsafe, but old boards shouldn't be burned, and demolition debris should be disposed of according to local rules.

Oldest housing: Marietta (1985), Atlanta (1988) and Austell (1989). In these communities, expect retrofit decks on older houses and aging decks that need structural inspection, ledger and flashing upgrades, or replacement. Newest housing: Acworth (1997), Kennesaw (1997) and Powder Springs (1996). 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 Mableton 1 N, about 2 miles away. It records an average of 64 days a year with a low at or below 32°F — a moderate number of freezing nights. On roughly 62 of those days the temperature climbs back above freezing, so water in wood, soil and gaps between boards repeatedly freezes and thaws.

Frost is less severe in Cobb County than in northern states, but footings still have to meet the local frost-depth requirement, and freeze-thaw cycles are enough to work loose nails and open checks in unsealed wood.

Snowfall is light — about 1.2 inches in an average year at Mableton 1 N — so occasional ice is a bigger concern than snow load. Textured boards and good drainage on stairs help on icy mornings.

Cobb County sees about 56.2 inches of precipitation a year, with measurable rain or snow (0.1 inch or more) on about 82 days. Good drainage between boards, clean gaps and a ledger that is properly flashed keep that water from rotting the frame.

Summer heat is mild by comparison — average summer highs near 83°F and only about 10 days a year at 90°F or above — so board color can be chosen mostly on looks.

• Replacement and major repair: about 176,771 homes (56%) 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.
• Retrofit decks on older homes: about 40,168 homes (13%) predate 1970. Here the priority is confirming that add-on decks are properly attached — or rebuilding them freestanding — before any cosmetic work.
• Upgrades and expansions: about 39,662 homes (13%) 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.

65% of Cobb County's homes are detached single-family houses and 9% are townhouses or other attached homes; 67% 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.

Georgia adopts statewide minimum construction codes that local governments enforce, often with local amendments. Your city or county building department issues deck permits. 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.