Deck builders in Plainfield, IL

The median home in Plainfield was built around 1997. A deck built with a house of that age is now about 29 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.

That makes Plainfield's housing 5 years newer than Will County as a whole, where the median home was built in 1992. Statewide, the median Illinois home was built in 1971. Among the 102 covered Illinois communities with Census data, Plainfield ranks #100 for oldest housing. In this ZIP code, 9% of homes were built before 1960, 10% between 1960 and 1979, 42% between 1980 and 1999, and 39% since 2000 — the single largest group dates to the 1990s.

The nearest NOAA climate station with 1991–2020 normals is Romeoville WFO, about 7 miles away. It records an average of 123 days a year with a low at or below 32°F — a substantial freezing season. On roughly 81 of those days the temperature climbs back above freezing, so water in wood, soil and gaps between boards repeatedly freezes and thaws.

For Plainfield, 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.

Average snowfall near Plainfield is about 29.2 inches a year (Plainfield 3 Ne). That's enough that shoveling and ice-melt choices affect deck surfaces, and stair treads benefit from good texture and drainage.

Plainfield sees about 41.1 inches of precipitation a year, with measurable rain or snow (0.1 inch or more) on about 76 days. Good drainage between boards, clean gaps and a ledger that is properly flashed keep that water from rotting the frame.

Average summer highs reach about 83°F, and around 16 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.

Budget, upkeep tolerance and sun exposure on your particular lot still decide the final choice between these options.

Plainfield has about 10,257 housing units across its covered ZIP code. 71% are single-family detached homes, 18% are attached homes such as townhouses and rowhouses, and about 11% are in buildings with two or more units. Roughly 84% of occupied homes are owner-occupied.

The mix of detached homes and attached or multi-unit housing in Plainfield means deck projects range from large backyard decks to compact rear decks on narrow lots. Lot size, neighbors' sightlines and any association rules shape the right design.

• Replacement and major repair: about 4,961 homes (48%) 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 1,301 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 1,103 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.

Plainfield has a defined building season. Spring and early fall offer the most comfortable working weather; winter is a good time to settle the design and apply for permits. Stains and sealers generally need dry weather and moderate temperatures, so plan wood finishing for late spring or early fall.

For Plainfield, IL, ask the permit office whether your deck needs a permit based on its size, height and attachment to the house, which drawings and inspections are required. Statewide code background for Illinois is on our state page; local rules change, so the building department remains the authority.

The closest covered area is Romeoville, about 6.3 miles from the center of Plainfield's covered ZIPs. Its median home was built in 1999, 2 years later than in Plainfield. The two have a similar share of detached single-family homes (71% vs. 69%). Owner-occupancy is 84% in Plainfield compared with 81% in Romeoville. Plainfield's covered ZIP code span about 24.2 square miles of land with roughly 10,257 homes — about 424 per square mile, a low density that usually allows larger decks and freestanding designs.