Home repair in Philadelphia, PA

Philadelphia homes at a glance

Median year built

1949

Built before 1960

65%

Built since 2000

10%

Owner-occupied

52%

Median home value

$243,100

Main heat

Gas, 70%

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

What Philadelphia’s housing means for repairs

Philadelphia is a rowhouse city. Only about 8% of homes are single-family detached, and the median home was built in 1949. That means most repairs touch a neighbor: a flat roof that drains across two houses, a party wall that carries moisture, or a sewer lateral that runs under a shared alley.

About 65% of the housing stock predates 1960, and gas heats about 70% of homes, often through an old boiler or a converted coal-era furnace in the basement. Expect galvanized supply lines, cast iron drains, knob-and-tube or early cloth-wired circuits, and plaster walls that crack instead of flexing. With the median home worth about $243,100 and only 52% of homes owner-occupied, a lot of the work is landlords keeping older units habitable.

Weather that wears on Philadelphia homes

Philadelphia gets cold, wet winters and hot, humid summers, and its flat and low-slope rowhouse roofs take the worst of both. Freeze-thaw cycles open seams in rolled roofing and modified bitumen, and ponding water finds the gap at the parapet or the chimney flashing. Heavy summer thunderstorms test downspouts that empty into old terra cotta or cast iron leaders, and when those clog, water backs up into the basement. Brick and brownstone fronts lose mortar to freeze-thaw, which lets water into the party wall. Basements in older blocks stay damp through humid summers, so efflorescence and musty smells are common.

Common repairs in Philadelphia

• Flat roof leak repair

  Rowhouse roofs leak at parapets, chimneys and seams between neighbors, and the stain usually shows up on the top-floor ceiling.

• Ceiling repair after a leak

  Old plaster ceilings sag and crack after a roof or bathroom leak, and patching them means matching plaster or skimming over lath.

• Drain and sewer line backups

  Cast iron stacks and old laterals under rowhouse alleys clog and crack, and the backup shows up at the basement floor drain.

• Boiler and radiator service

  Many Philadelphia homes run gas boilers with cast iron radiators that need bleeding, valve work and burner service each fall.

• Brick pointing and front steps

  Marble and brick front steps loosen as mortar washes out, and they are a trip hazard on a narrow sidewalk.

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 Philadelphia homeowners

• Roof leaks in one spot and stains the ceiling below

  Flat rowhouse roofs in Philadelphia tend to leak in one spot near a parapet or chimney, which this guide helps you trace.

• Ceiling is stained and sagging after a water leak

  A stained, sagging ceiling under a Philadelphia flat roof or second-floor bath is one of the most common calls in older rowhouses.

• Sewage backs up into the basement floor drain

  Basement floor drains in Philadelphia rowhouses tie into old laterals that back up during heavy storms.

• Bricks on the porch steps are loose, missing or crumbling

  Brick front steps on Philadelphia rowhouses lose mortar to freeze-thaw and need repointing before they come apart.

Seasonal checklist

Fall

Clear the roof drain and scuppers on your flat roof and check the flashing where your roof meets your neighbor's parapet.

Winter

Keep heat on in a vacant unit or back room so the water lines in exterior rowhouse walls do not freeze.

Spring

Look at the top-floor ceiling and the basement walls for new stains after the freeze-thaw season ends.

Summer

Run a dehumidifier in the basement and confirm the downspouts empty away from the foundation, not into a clogged leader.

Common questions

Who fixes a roof leak that comes from my neighbor's side of a Philadelphia rowhouse?

Water often travels along the parapet or a shared seam, so the leak may start on the roof next door. A roofer can tell you where the water enters, and the fix may need both owners to agree. Runhome can get the roof looked at and give you a written estimate to share with your neighbor.

Does a Philadelphia house built before 1950 still have knob-and-tube wiring?

Some do, especially where earlier owners added circuits instead of rewiring. An electrician can confirm what is behind the plaster when you open a wall or add an outlet. Replacing it room by room is common in rowhouses because walls are shared and runs are short.

What drives the cost of a boiler repair in Philadelphia?

The age of the boiler, whether parts are still made for it, and whether the problem is the burner, the circulator or the piping all change the price. Steam systems in older rowhouses take more labor than hot water systems. Describe the symptoms to Runhome and you get an estimate before anyone comes out.

Neighborhoods served

• Fishtown
• Northern Liberties
• Manayunk
• Germantown
• Society Hill
• Point Breeze
• Kensington
• Chestnut Hill

Other Pennsylvania cities

• Home repair in Pittsburgh