Deck builders in Clarendon Hills, IL

Homes in Clarendon Hills have a median construction year of 1977, so a deck original to a typical house would now be about 49 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.

That is about the same as DuPage County overall (median 1978). Statewide, the median Illinois home was built in 1971. Among the 102 covered Illinois communities with Census data, Clarendon Hills ranks #58 for oldest housing. In this ZIP code, 28% of homes were built before 1960, 25% between 1960 and 1979, 27% between 1980 and 1999, and 20% since 2000 — the single largest group dates to the 1980s.

The nearest NOAA climate station with 1991–2020 normals is Lisle-Morton Arboretum, about 6 miles away. It records an average of 144 days a year with a low at or below 32°F — a long, hard freezing season. On roughly 98 of those days the temperature climbs back above freezing, so water in wood, soil and gaps between boards repeatedly freezes and thaws.

For Clarendon Hills, 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.

Clarendon Hills sees about 39.7 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 17 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.

Clarendon Hills has about 4,028 housing units across its covered ZIP code. 66% are single-family detached homes, 4% are attached homes such as townhouses and rowhouses, and about 29% are in buildings with two or more units. Roughly 78% of occupied homes are owner-occupied.

The mix of detached homes and attached or multi-unit housing in Clarendon Hills 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.

• Retrofit decks on older homes: about 1,748 homes (43%) 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 1,480 homes (37%) 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 257 homes (6%) 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.

With about 144 freezing days a year, the building window in Clarendon Hills is compressed. Design, drawings and permits are usually handled in winter so footings can go in as soon as the ground allows in spring, and finishes like stain are applied before nights turn cold in fall.

For Clarendon Hills, 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 Westmont, about 0.6 miles from the center of Clarendon Hills's covered ZIPs. Its median home was built in 1976, 1 years earlier than in Clarendon Hills. Clarendon Hills has 21 percentage points more detached single-family homes (66% vs. 45%), which changes how many projects are backyard decks versus compact townhouse decks. Owner-occupancy is 78% in Clarendon Hills compared with 59% in Westmont. Clarendon Hills's covered ZIP code span about 2 square miles of land with roughly 4,028 homes — about 2,014 per square mile, a typical suburban density where most homes have usable backyards.