Looking for a retaining wall contractor in Portsmouth, NH? Describe your project once and up to three retaining wall contractors who work in Portsmouth and Rockingham County get back to you with a quote. It's free and there is no obligation.
Portsmouth is home to about 22,938 people (2024 Census Bureau estimate), a growing community (+4.5% since 2020). With 1,465 people per sq mi, it is a suburban area. Sloped lots, terraced yards and driveways cut into hillsides keep local wall builders busy.
Portsmouth at a glance
- Population (Census Bureau estimate, 2024)
- 22,938 (+4.5% since 2020)
- Rank in New Hampshire
- 7th of 13 cities and towns
- Land area
- 16 sq mi
- Population density
- 1,465 people per sq mi (suburban)
- Type
- City (Portsmouth city)
- Main county
- Rockingham County
What to check before hiring in Portsmouth
- Permit and engineer: in New Hampshire, taller walls or walls with loads above usually need an engineered design and a permit.
- Drainage: ask how water behind the wall will be drained.
- Property line: a survey avoids building on the neighbor's land.
- Price drivers: height, length, material, access and drainage.
Useful official resources
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ICC: International Code Council
Official information and guidance.
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Call 811
Official information and guidance.
Services available in Portsmouth
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Retaining wall construction
Design and construction of a new retaining wall with drainage.
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Retaining wall repair or replacement
Assessment and repair or replacement of a leaning, bulging or cracked wall.
Frequently asked questions in Portsmouth
How much does a retaining wall cost in Portsmouth, NH?
It depends on height, length, material and access. Describe your project: contractors who serve Portsmouth reply with a quote.
How long does it take?
A small wall can take a few days; engineered walls take longer with permits.
Can a failing wall be repaired?
Sometimes; often a leaning wall must be rebuilt with proper drainage.
Which retaining wall contractors will contact me?
Up to three independent retaining wall contractors who serve Portsmouth 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.