Looking for a basement contractor in Philadelphia, PA? Describe your project once and up to three basement contractors who work in Philadelphia and Philadelphia County get back to you with a quote. It's free and there is no obligation.
Philadelphia is home to about 1,573,916 people (2024 Census Bureau estimate), a shrinking community (−1.9% since 2020). With 11,717 people per sq mi, it is a densely built-up area. Full basements are common here and often the cheapest way to add living space.
Philadelphia at a glance
- Population (Census Bureau estimate, 2024)
- 1,573,916 (−1.9% since 2020)
- Rank in Pennsylvania
- 1st of 1,013 cities and towns
- Land area
- 134 sq mi
- Population density
- 11,717 people per sq mi (densely built-up)
- Type
- City (Philadelphia city)
- Main county
- Philadelphia County
What to check before hiring in Philadelphia
- Moisture first: waterproof before finishing.
- Egress: in Pennsylvania, a basement bedroom needs an escape opening.
- Radon: test before you finish.
- Price drivers: size, bathroom, ceiling height, finishes and egress.
Useful official resources
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ICC: International Code Council
Official information and guidance.
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EPA: radon
Official information and guidance.
Services available in Philadelphia
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Basement finishing
Framing, insulation, electrical, drywall and flooring of a basement, with permit.
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Basement bathroom or rental unit
Bathroom, kitchenette or legal basement unit with egress and plumbing.
Frequently asked questions in Philadelphia
How much does basement finishing cost in Philadelphia, PA?
It depends on size, bathroom and finishes. Describe your basement: contractors who serve Philadelphia reply with a quote.
How long does it take?
Often several weeks.
Can I rent it out?
Only if local rules allow an accessory unit; check zoning.
Which basement contractors will contact me?
Up to three independent basement contractors who serve Philadelphia and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.