Home repair in Washington, DC

Washington homes at a glance

Median year built

1958

Built before 1960

52%

Built since 2000

24%

Owner-occupied

42%

Median home value

$737,100

Main heat

Gas, 48%

Source: U.S. Census Bureau, American Community Survey 2024 1-year estimates

What Washington’s housing means for repairs

Washington's housing splits between prewar rowhouses and new condo buildings. About 52% of homes predate 1960, about 24% were built since 2000, and the median year built is 1958. Only about 11% are single-family detached, so most owners deal with shared walls, flat roofs and basement units that were converted into rentals.

Heating is split almost evenly, with gas in about 48% of homes and electric in about 47%. Older rowhouses often run radiators or retrofitted forced air, while newer condos use electric heat pumps in closets. The median home value is about $737,100 and only about 42% of homes are owner-occupied, so condo boards, landlords and owners of English basements all need repairs done right the first time.

Weather that wears on Washington homes

DC summers are hot and humid, and winters bring a few hard freezes and the occasional heavy snow. The humidity drives mold in below-grade basement units and condensation in ductwork. Flat rowhouse roofs and box gutters leak where freeze-thaw cracks the membrane or the coping. Summer thunderstorms can overwhelm older combined sewers and push water into basement drains in low-lying areas. Old brick fronts lose mortar, and the city's mature trees drop limbs and fill gutters every fall. Radiators and boilers sit idle for months and then need to work hard on the first cold week of the season.

Common repairs in Washington

• Rowhouse roof and box gutter repair

  Flat roofs and built-in gutters on DC rowhouses leak at seams and coping, often right above the stairwell or top bedroom.

• Basement unit leaks and mold

  English basements in DC take on water at the walls and floor drain during heavy summer storms, and humidity follows.

• Plaster ceiling repair

  Old plaster ceilings in DC rowhouses crack and sag after a leak from an upstairs bath or the roof.

• Radiator and boiler service

  Rowhouses that still have radiators need bleeding, valve fixes and boiler service before winter.

• Bathtub caulk and tile leaks

  In stacked rowhouses and condos, a failed tub seal shows up as a stain on the ceiling of the unit below.

What these repairs cost

The middle half of Runhome repair estimates nationwide for each kind of job. Your price depends on the scope of the work.

Fix guides for Washington homeowners

• Bathtub is separating from the wall

  In DC rowhouses and condos, a tub pulling away from the wall often shows up first as a stain on the ceiling below.

• Ceiling is stained and sagging after a water leak

  Plaster ceilings in older DC homes sag after leaks from upstairs baths and flat roofs.

• Roof leaks in one spot and stains the ceiling below

  Flat roofs on Washington rowhouses usually leak in one spot near the coping or a vent, which this guide helps you narrow down.

• Sewage backs up into the basement floor drain

  Basement units in low-lying DC neighborhoods can see backups through the floor drain during summer downpours.

Seasonal checklist

Spring

Clean your box gutters and downspouts after the trees bloom so the first heavy rain drains off the roof.

Summer

Run a dehumidifier in a basement unit and check behind furniture on exterior walls for mold.

Fall

Bleed your radiators and have the boiler serviced before the first cold week.

Winter

Keep snow and ice off a flat roof drain so meltwater does not pond against the parapet.

Common questions

Who pays to fix a leak between two condo units in DC?

It depends on where the leak starts and what your condo documents say about unit versus common elements. A tub or shower leak inside a unit is usually the upstairs owner's job. A plumber can find the source, and that report helps you and the board sort out who pays.

Why does my DC basement unit smell musty every summer?

Below-grade rooms stay cooler than the outdoor air, so humid summer air condenses on walls and floors. A dehumidifier, working gutters and downspouts that empty away from the house help. If there is visible mold or water at the base of the wall, get it looked at before you repaint.

What affects the price of a flat roof repair on a Washington rowhouse?

The membrane type, how many layers are already on the roof, roof access and whether the coping and parapet need work all change the cost. Patching a seam costs much less than replacing the whole roof. Runhome gives you an estimate from photos before a roofer comes out.

Neighborhoods served

• Capitol Hill
• Georgetown
• Columbia Heights
• Petworth
• Shaw
• Brookland
• Anacostia
• Adams Morgan