Looking for an addition contractor in Brentwood, PA? Describe your project once and up to three addition contractors who work in Brentwood and Allegheny County get back to you with a quote. It's free and there is no obligation.
Brentwood is home to about 9,704 people (2024 Census Bureau estimate), a shrinking community (−3.8% since 2020). With 6,699 people per sq mi, it is a densely built-up area. Growing families here often add space instead of moving.
Brentwood at a glance
- Population (Census Bureau estimate, 2024)
- 9,704 (−3.8% since 2020)
- Rank in Pennsylvania
- 73rd of 1,013 cities and towns
- Land area
- 1.4 sq mi
- Population density
- 6,699 people per sq mi (densely built-up)
- Type
- Borough (Brentwood borough)
- Main county
- Allegheny County
What to check before hiring in Brentwood
- Zoning: check Brentwood's setbacks, lot coverage and height limits first.
- License and permit: in Pennsylvania, additions are built by licensed contractors under a permit.
- Structure: second stories need an engineer to check the existing house.
- Price drivers: size, foundation, roof tie-in, plumbing and finishes.
Useful official resources
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ICC: International Code Council
Official information and guidance.
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NAHB
Official information and guidance.
Services available in Brentwood
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Room addition
Ground-floor addition with foundation, framing, roof and finishes.
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Second-story addition
New floor over the existing house, with structural engineering.
Frequently asked questions in Brentwood
How much does an addition cost in Brentwood, PA?
It depends on size, foundation and finishes. Describe your project: contractors who serve Brentwood reply with a quote.
How long does it take?
Often a few months, plus design and permits.
Does an addition raise property taxes?
Usually, since it increases the assessed value.
Which addition contractors will contact me?
Up to three independent addition contractors who serve Brentwood 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.