How old are homes in Dickerson, and what does that mean for a deck?
35% of homes in Dickerson's covered ZIP code were built in 2000 or later and 35% before 1960; the largest group dates to the 2000s.
Homes in Dickerson have a median construction year of 1979, so a deck original to a typical house would now be about 47 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 Montgomery County overall (median 1980). Statewide, the median Maryland home was built in 1979. Among the 128 covered Maryland communities with Census data, Dickerson ranks #48 for oldest housing. In this ZIP code, 35% of homes were built before 1960, 15% between 1960 and 1979, 15% between 1980 and 1999, and 35% since 2000 — the single largest group dates to the 2000s.
| Decade built | Homes | Share |
|---|---|---|
| 2020 or later | 7 | 1% |
| 2010s | 94 | 11% |
| 2000s | 194 | 23% |
| 1990s | 76 | 9% |
| 1980s | 52 | 6% |
| 1970s | 89 | 10% |
| 1960s | 40 | 5% |
| 1950s | 112 | 13% |
| 1940s | 44 | 5% |
| before 1940 | 147 | 17% |
What does Dickerson's climate mean for deck construction?
Dickerson averages about 98 days a year at or below freezing, 32.6 inches of snow and 47.6 inches of precipitation, based on NOAA 1991–2020 normals.
The nearest NOAA climate station with 1991–2020 normals is Damascus 3 Ssw, about 11 miles away. It records an average of 98 days a year with a low at or below 32°F — a moderate number of freezing nights. On roughly 78 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 Dickerson 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.
Average snowfall near Dickerson is about 32.6 inches a year (Clarksburg 2.1 Ne). That's enough that shoveling and ice-melt choices affect deck surfaces, and stair treads benefit from good texture and drainage.
Dickerson sees about 47.6 inches of precipitation a year, with measurable rain or snow (0.1 inch or more) on about 83 days. Good drainage between boards, clean gaps and a ledger that is properly flashed keep that water from rotting the frame.
Summer heat is mild by comparison — average summer highs near 82°F and only about 13 days a year at 90°F or above — so board color can be chosen mostly on looks.
Which decking material makes the most sense in Dickerson?
For most Dickerson homes, capped composite is the strongest starting point because about 78 freeze-thaw days a year are hard on unsealed wood and roughly 32.6 inches of snow a year means regular shoveling.
Budget, upkeep tolerance and sun exposure on your particular lot still decide the final choice between these options.
| Material | How it handles Dickerson's conditions |
|---|---|
| Pressure-treated pine | Economical; needs sealing to resist freeze-thaw splitting |
| Cedar | Attractive and stable; refinish to keep its color |
| Capped composite | Low maintenance; handles moisture and freeze-thaw well |
| PVC | Lightest and most moisture-proof; premium price |
What kinds of homes are in Dickerson, and how does that shape deck design?
Dickerson has about 855 housing units across its covered ZIP code. 94% are single-family detached homes, 0% are attached homes such as townhouses and rowhouses, and about 6% are in buildings with two or more units. Roughly 82% of occupied homes are owner-occupied.
Detached single-family homes dominate in Dickerson, 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.
What deck projects are most common in Dickerson?
Based on the age of Dickerson'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 343 homes (40%) 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 217 homes (25%) 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 101 homes (12%) 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.
When is the best time to plan a deck project in Dickerson?
Dickerson 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.
Do you need a permit to build a deck in Dickerson?
Often, yes — especially for attached or elevated decks — but the rules are set locally. Check with the building department that serves your address: the municipality, or Montgomery County for unincorporated areas.
For Dickerson, 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.
How does Dickerson compare with nearby covered areas?
The closest covered area is Beallsville, about 1.5 miles from the center of Dickerson's covered ZIPs. Its median home was built in 1969, 10 years earlier than in Dickerson. Dickerson has 6 percentage points fewer detached single-family homes (94% vs. 100%), which changes how many projects are backyard decks versus compact townhouse decks. Owner-occupancy is 82% in Dickerson compared with 50% in Beallsville. Dickerson's covered ZIP code span about 55.7 square miles of land with roughly 855 homes — about 15 per square mile, a low density that usually allows larger decks and freestanding designs.
| Area | Distance | Median year built | Covered ZIPs |
|---|---|---|---|
| Beallsville | 1.5 mi | 1969 | 1 |
| Barnesville | 2.9 mi | 1968 | 1 |
| Boyds | 5.1 mi | 2003 | 1 |
| Poolesville | 5.8 mi | 1989 | 1 |
| Tuscarora | 6.4 mi | 1991 | 1 |
| Adamstown | 7.5 mi | 1996 | 1 |
Deck planning checklist for Dickerson homeowners
- Confirm your ZIP code is 20842, the covered Dickerson ZIP.
- Find out when your current deck was built and whether it uses pre-2004 treated lumber.
- Plan stair location and snow storage so winter shoveling doesn't damage boards or railings.
- Probe the ledger, post bases and joist tops for soft wood before planning a resurface.
- Call 811 before any digging so utility lines are marked.

