Retaining Walls work on a jobsite in New Hampshire

Retaining Walls in New Hampshire

Retaining Walls contractors in New Hampshire

Segmental block, poured concrete, timber and boulder walls built with the base, drainage and reinforcement that keep them standing.

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Project guide

Hiring retaining walls contractors in New Hampshire

Retaining walls hold back soil where a grade change is too steep to slope, and they fail for one reason far more than any other: water. A wall that lasts has a compacted crushed-stone base, a perforated drain pipe at the heel, clean gravel backfill behind the wall face, and geogrid layers tied into the backfill on anything tall. Segmental concrete block is the most common residential system and can be built by a landscape contractor up to about four feet; above that, or wherever a driveway, slope or structure sits above the wall, an engineer's design is required by most codes and the wall becomes structural work. Poured concrete and reinforced masonry walls are used for tall cuts and tight sites, boulder walls for rural and natural-look projects, and pressure-treated timber for budget walls with a shorter life.

GradeLine lists 33 retaining walls contractors that serve New Hampshire.Compare their work and equipment, then confirm availability and service area before requesting a quote.

Listed businesses are based in Brentwood, Sunapee, West Chesterfield, , Madison, Northfield, though most crews travel well beyond their home city.

What retaining walls work costs

Segmental block walls typically cost $25 to $50 per square foot of wall face installed, poured concrete $30 to $60, timber $15 to $30 and boulder walls $20 to $40. A four foot tall, 50 foot long block wall therefore commonly runs $5,000 to $10,000, and engineered walls above that height climb quickly once geogrid, engineering and larger equipment are involved.

Ranges are national and approximate; regional labor rates, material prices and site conditions move them in both directions.

Common projects

Segmental block and gravity walls for yards, driveways and terraced slopes
Engineered poured concrete, reinforced masonry and sheet pile walls for tall or surcharged cuts
Boulder walls, timber walls, terracing and replacement of leaning or failed walls

What affects a quote

Wall height and length, and whether a surcharge such as a driveway, pool or slope sits above it
Engineering, excavation, base preparation, drainage and geogrid the design requires
Block or material type, backfill stone, spoil haul-off and restoring the grade above and below

Retaining Walls FAQ

What does retaining walls work cost?

What should I share when requesting a retaining walls estimate?

Send the height and length of the grade change, a photo of the slope, what sits above and below the wall, where water comes from, and the look you are after.

What can change the cost of retaining walls work in New Hampshire?

The main cost items are wall height and length, and whether a surcharge such as a driveway, pool or slope sits above it; engineering, excavation, base preparation, drainage and geogrid the design requires; block or material type, backfill stone, spoil haul-off and restoring the grade above and below. A site visit helps the crew see which ones apply.

Do retaining walls projects in New Hampshire need permits?

Most building codes exempt walls under four feet measured from the bottom of the footing with no surcharge, and require a permit and stamped engineering above that. Walls near a property line, a public sidewalk or a stream can trigger additional setback, drainage and environmental review.