Deck builders in Kensington, MD

The median home in Kensington dates to about 1958, roughly 68 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 Kensington's housing 22 years older than Montgomery County as a whole, where the median home was built in 1980. Statewide, the median Maryland home was built in 1979. Among the 128 covered Maryland communities with Census data, Kensington ranks #12 for oldest housing. In this ZIP code, 61% of homes were built before 1960, 24% between 1960 and 1979, 6% between 1980 and 1999, and 9% since 2000 — the single largest group dates to the 1950s.

The nearest NOAA climate station with 1991–2020 normals is Rockville 1 Ne, about 6 miles away. It records an average of 86 days a year with a low at or below 32°F — a moderate number of freezing nights. On roughly 72 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 Kensington 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 5.8 inches in an average year at Dalecarlia Rsvr — so occasional ice is a bigger concern than snow load. Textured boards and good drainage on stairs help on icy mornings.

Kensington sees about 48 inches of precipitation a year, with measurable rain or snow (0.1 inch or more) on about 81 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 85°F, and around 23 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 Kensington's many older homes, a wood-look capped composite or a stained cedar deck usually suits the architecture better than high-gloss boards.

Kensington has about 7,292 housing units across its covered ZIP code. 78% are single-family detached homes, 5% are attached homes such as townhouses and rowhouses, and about 17% are in buildings with two or more units. Roughly 79% of occupied homes are owner-occupied.

Detached single-family homes dominate in Kensington, so most decks are backyard decks attached to the rear of the house. That gives more freedom on size, layout and stairs, and makes a well-planned deck one of the most-used rooms of the home.

• Retrofit decks on older homes: about 5,495 homes (75%) 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 1,110 homes (15%) 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 408 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.

Kensington's milder winters — about 86 freezing nights a year — allow construction through most of the year. Spring and fall are still the busiest seasons, so booking early helps.

For Kensington, MD, 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 Maryland is on our state page; local rules change, so the building department remains the authority.

The closest covered area is Garrett Park, about 1.1 miles from the center of Kensington's covered ZIPs. Its median home was built in 1952, 6 years earlier than in Kensington. Kensington has 22 percentage points fewer detached single-family homes (78% vs. 100%), which changes how many projects are backyard decks versus compact townhouse decks. Owner-occupancy is 79% in Kensington compared with 97% in Garrett Park. Kensington's covered ZIP code span about 4.1 square miles of land with roughly 7,292 homes — about 1,779 per square mile, a typical suburban density where most homes have usable backyards.