How old are homes in Arlington County, and what does that mean for decks?
The median home in Arlington County was built in 1976; 33% predate 1960 and 27% were built since 2000.
Arlington County has about 121,970 homes, with a median construction year of 1976 (the Virginia median is 1984). Within our covered ZIP codes — about 122,414 homes — the median is 1976, close to the county as a whole.
Homes in the covered parts of Arlington County have a median construction year of 1976, so a deck original to a typical house would now be about 50 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.
| Decade built | Homes | Share |
|---|---|---|
| 2020 or later | 2,392 | 2% |
| 2010s | 14,179 | 12% |
| 2000s | 16,723 | 14% |
| 1990s | 10,646 | 9% |
| 1980s | 13,368 | 11% |
| 1970s | 10,176 | 8% |
| 1960s | 13,640 | 11% |
| 1950s | 14,918 | 12% |
| 1940s | 15,935 | 13% |
| before 1940 | 9,993 | 8% |
Which Arlington County communities have the oldest and newest homes?
Among covered Arlington County communities, Fort Myer has the oldest housing (median 1938) and Arlington the newest (median 1976).
Oldest housing: Fort Myer (1938) and Arlington (1976). In these communities, expect retrofit decks on older houses and aging decks that need structural inspection, ledger and flashing upgrades, or replacement. Newest housing: Arlington (1976) and Fort Myer (1938). Here, projects lean toward enlarging builder-installed decks, adding stairs and railings, and upgrading to low-maintenance boards.
How does Arlington County's climate affect deck building?
Covered parts of Arlington County average about 96 days a year at or below freezing (NOAA 1991–2020 normals, 2 stations). Across the covered communities, nearby stations range from about 60 to 96 freezing days a year, so conditions differ noticeably between Arlington County's higher, more rural areas and its urban core.
The nearest NOAA climate station with 1991–2020 normals is Dalecarlia Rsvr, about 2 miles away. It records an average of 96 days a year with a low at or below 32°F — a moderate number of freezing nights. On roughly 88 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 Arlington County 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.
Arlington County sees about 48.5 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.
Summers are hot: average summer highs are near 86°F, with about 44 days a year reaching 90°F or more. Surface temperature is a real consideration — lighter board colors, shade from the house or a pergola, and heat-mitigating composite lines are worth comparing.
What deck projects are most common in Arlington County?
Based on the age of Arlington County's housing, the largest group of projects is likely to be retrofitting or rebuilding decks added to older homes.
- Retrofit decks on older homes: about 54,486 homes (45%) 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 34,190 homes (28%) 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 16,571 homes (14%) 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.
Which Arlington County communities do you serve?
2 communities in Arlington County have covered ZIP codes. Only the ZIPs listed are covered.
| Community | Covered ZIPs here | Median year built | Detached homes |
|---|---|---|---|
| Arlington | 22201, 22202, 22203, 22204, 22205, 22206, 22207, 22209, 22213, 22214 | 1976 | 25% |
| Fort Myer | 22211 | 1938 | 7% |
What decking material works best in Arlington County?
Light-colored composite or pressure-treated wood is a strong default for Arlington County because about 88 freeze-thaw days a year are hard on unsealed wood and about 44 days of 90°F+ heat make board color and surface temperature important.
25% of Arlington County's homes are detached single-family houses and 9% are townhouses or other attached homes; 41% of occupied homes are owner-occupied. With mostly detached homes, wood remains a practical lower-cost option for homeowners willing to clean and seal on schedule.
Who issues deck permits in Arlington County?
It depends on where you live: incorporated cities and towns in Arlington County usually run their own permit offices, while unincorporated areas are typically served by Arlington County.
Virginia uses the statewide Uniform Statewide Building Code (USBC), administered by the Department of Housing and Community Development and enforced by local building departments. Before work starts, confirm with the building department for your exact address whether a permit is required, what drawings and inspections it involves, and whether an HOA must approve the design.