Looking for an addition contractor in Valley Stream, NY? Describe your project once and up to three addition contractors who work in Valley Stream and Nassau County get back to you with a quote. It's free and there is no obligation.
Valley Stream is home to about 40,232 people (2024 Census Bureau estimate), a stable community (−1.0% since 2020). With 11,569 people per sq mi, it is a densely built-up area. Growing families here often add space instead of moving.
Valley Stream at a glance
- Population (Census Bureau estimate, 2024)
- 40,232 (−1.0% since 2020)
- Rank in New York
- 18th of 595 cities and towns
- Land area
- 3.5 sq mi
- Population density
- 11,569 people per sq mi (densely built-up)
- Type
- Village (Valley Stream village)
- Main county
- Nassau County
What to check before hiring in Valley Stream
- Zoning: check Valley Stream's setbacks, lot coverage and height limits first.
- License and permit: in New York, 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 Valley Stream
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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 Valley Stream
How much does an addition cost in Valley Stream, NY?
It depends on size, foundation and finishes. Describe your project: contractors who serve Valley Stream 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 Valley Stream 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.