Deck builders in Forest Park, IL

The median home in Forest Park dates to about 1949, roughly 77 years ago. Most homes from that era were built without a deck; the decks you see now were usually added in later decades, sometimes by previous owners with little documentation.

That history matters: retrofit decks are where missing ledger flashing, undersized footings and nailed-rather-than-bolted connections are most common. Before resurfacing or extending an add-on deck, it is worth confirming how it was framed and attached.

That makes Forest Park's housing 12 years older than Cook County as a whole, where the median home was built in 1961. Statewide, the median Illinois home was built in 1971. Among the 102 covered Illinois communities with Census data, Forest Park ranks #7 for oldest housing. In this ZIP code, 56% of homes were built before 1960, 32% between 1960 and 1979, 4% between 1980 and 1999, and 7% since 2000 — the single largest group dates to the before 1940.

The nearest NOAA climate station with 1991–2020 normals is Chicago Midway AP, about 7 miles away. It records an average of 106 days a year with a low at or below 32°F — a substantial freezing season. On roughly 67 of those days the temperature climbs back above freezing, so water in wood, soil and gaps between boards repeatedly freezes and thaws.

For Forest Park, 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 Oak Brook 2w station averages about 42.3 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 34.4 inches a year, falling on about 68 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 83°F, and around 20 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.

On Forest Park's many older homes, a wood-look capped composite or a stained cedar deck usually suits the architecture better than high-gloss boards.

Forest Park has about 7,649 housing units across its covered ZIP code. 29% are single-family detached homes, 6% are attached homes such as townhouses and rowhouses, and about 65% are in buildings with two or more units. Roughly 53% of occupied homes are owner-occupied.

Because so much of the housing in Forest Park is multi-unit, a meaningful number of decks and balconies are governed by condominium or building associations. For single-family homes and townhouses here, check whether any association rules apply before you design.

• Retrofit decks on older homes: about 5,667 homes (74%) 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 1,417 homes (19%) 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 165 homes (2%) 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.

Forest Park 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 Forest Park, 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 Hines, about 1.2 miles from the center of Forest Park's covered ZIPs. Its median home was built in 1964, 15 years later than in Forest Park. Forest Park has 29 percentage points more detached single-family homes (29% vs. 0%), which changes how many projects are backyard decks versus compact townhouse decks. Owner-occupancy is 53% in Forest Park compared with 0% in Hines. Forest Park's covered ZIP code span about 2.8 square miles of land with roughly 7,649 homes — about 2,732 per square mile, dense enough that lot size, access for materials and neighbors' sightlines shape most deck plans.