Looking for an addition contractor in Middlesex, NJ? Describe your project once and up to three addition contractors who work in Middlesex and Middlesex County get back to you with a quote. It's free and there is no obligation.
Middlesex is home to about 14,874 people (2024 Census Bureau estimate), a growing community (+1.6% since 2020). With 4,264 people per sq mi, it is a densely built-up area. Growing families here often add space instead of moving.
Middlesex at a glance
- Population (Census Bureau estimate, 2024)
- 14,874 (+1.6% since 2020)
- Rank in New Jersey
- 70th of 323 cities and towns
- Land area
- 3.5 sq mi
- Population density
- 4,264 people per sq mi (densely built-up)
- Type
- Borough (Middlesex borough)
- Main county
- Middlesex County
What to check before hiring in Middlesex
- Zoning: check Middlesex's setbacks, lot coverage and height limits first.
- License and permit: in New Jersey, 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 Middlesex
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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 Middlesex
How much does an addition cost in Middlesex, NJ?
It depends on size, foundation and finishes. Describe your project: contractors who serve Middlesex 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 Middlesex 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.