Deck builders in Gwinnett County, GA

Gwinnett County has about 340,962 homes, with a median construction year of 1996 (the Georgia median is 1992). Within our covered ZIP codes — about 314,843 homes — the median is 1996, close to the county as a whole.

The median home in the covered parts of Gwinnett County was built around 1996. A deck built with a house of that age is now about 30 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: Lilburn (1986), Norcross (1988) and Peachtree Corners (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: Grayson (2003), Dacula (2003) and Buford (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 Atlanta Peachtree AP, about 7 miles away. It records an average of 49 days a year with a low at or below 32°F — relatively few freezing nights. On roughly 47 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 Gwinnett 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 0.5 inches in an average year at Winder 4s — so occasional ice is a bigger concern than snow load. Textured boards and good drainage on stairs help on icy mornings.

Gwinnett County sees about 56.3 inches of precipitation a year, with measurable rain or snow (0.1 inch or more) on about 80 days. Good drainage between boards, clean gaps and a ledger that is properly flashed keep that water from rotting the frame.

Summers are hot: average summer highs are near 88°F, with about 53 days a year reaching 90°F or more. Surface temperature is a real consideration — lighter board colors, shade from the house or a pergola, and heat-mitigating composite lines are worth comparing.

• Replacement and major repair: about 185,517 homes (54%) 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 54,113 homes (16%) 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.
• Retrofit decks on older homes: about 14,884 homes (4%) predate 1970. Here the priority is confirming that add-on decks are properly attached — or rebuilding them freestanding — before any cosmetic work.

71% of Gwinnett County's homes are detached single-family houses and 6% are townhouses or other attached homes; 66% 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.