Deck builders in Vernon Hills, IL

The median home in Vernon Hills was built around 1991. A deck built with a house of that age is now about 35 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 Vernon Hills's housing 8 years newer than Lake County as a whole, where the median home was built in 1983. Statewide, the median Illinois home was built in 1971. Among the 102 covered Illinois communities with Census data, Vernon Hills ranks #93 for oldest housing. In this ZIP code, 2% of homes were built before 1960, 29% between 1960 and 1979, 33% between 1980 and 1999, and 35% since 2000 — the single largest group dates to the 1970s.

The nearest NOAA climate station with 1991–2020 normals is Mundelein 4 Wsw, about 6 miles away. It records an average of 140 days a year with a low at or below 32°F — a long, hard freezing season. On roughly 86 of those days the temperature climbs back above freezing, so water in wood, soil and gaps between boards repeatedly freezes and thaws.

For Vernon 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 Mundelein 4 Wsw station averages about 43.1 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 38.5 inches a year, falling on about 73 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.

Summer heat is mild by comparison — average summer highs near 80°F and only about 11 days a year at 90°F or above — so board color can be chosen mostly on looks.

Other Vernon Hills factors: many elevated townhouse decks are hard to reach for re-staining. Budget, upkeep tolerance and sun exposure on your particular lot still decide the final choice between these options.

Vernon Hills has about 11,823 housing units across its covered ZIP code. 40% are single-family detached homes, 21% are attached homes such as townhouses and rowhouses, and about 39% are in buildings with two or more units. Roughly 68% of occupied homes are owner-occupied.

With a large share of townhouses, many decks in Vernon Hills are elevated rear decks over a walk-out level, built close to neighbors. Privacy screens, setbacks, guard height and HOA design approval tend to drive these projects, and repairs to shared structures may require coordinating with an association.

• Replacement and major repair: about 7,033 homes (59%) 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 1,336 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.
• Retrofit decks on older homes: about 600 homes (5%) predate 1970. Here the priority is confirming that add-on decks are properly attached — or rebuilding them freestanding — before any cosmetic work.

With about 140 freezing days a year, the building window in Vernon 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 Vernon 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, and whether your townhouse association must approve the design first. 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 Lincolnshire, about 3.1 miles from the center of Vernon Hills's covered ZIPs. Homes there have the same median construction year (1991). Vernon Hills has 16 percentage points fewer detached single-family homes (40% vs. 56%), which changes how many projects are backyard decks versus compact townhouse decks. Owner-occupancy is 68% in Vernon Hills compared with 80% in Lincolnshire. Vernon Hills's covered ZIP code span about 8.4 square miles of land with roughly 11,823 homes — about 1,408 per square mile, a typical suburban density where most homes have usable backyards.