Looking for an addition contractor in Nashua, NH? Describe your project once and up to three addition contractors who work in Nashua and Hillsborough County get back to you with a quote. It's free and there is no obligation.
Nashua is home to about 91,851 people (2024 Census Bureau estimate), a stable community (+0.6% since 2020). With 2,979 people per sq mi, it is a suburban area. Growing families here often add space instead of moving.
Nashua at a glance
- Population (Census Bureau estimate, 2024)
- 91,851 (+0.6% since 2020)
- Rank in New Hampshire
- 2nd of 13 cities and towns
- Land area
- 31 sq mi
- Population density
- 2,979 people per sq mi (suburban)
- Type
- City (Nashua city)
- Main county
- Hillsborough County
What to check before hiring in Nashua
- Zoning: check Nashua's setbacks, lot coverage and height limits first.
- License and permit: in New Hampshire, 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
-
ICC: International Code Council
Official information and guidance.
-
NAHB
Official information and guidance.
Services available in Nashua
-
Room addition
Ground-floor addition with foundation, framing, roof and finishes.
-
Second-story addition
New floor over the existing house, with structural engineering.
Frequently asked questions in Nashua
How much does an addition cost in Nashua, NH?
It depends on size, foundation and finishes. Describe your project: contractors who serve Nashua 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 Nashua 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.