Retaining Walls in Suffolk County, Long Island — APM O'Neill & Sons

Retaining walls
built to hold.

Segmental block and natural-stone retaining walls with frost-depth footings, geogrid reinforcement, weep pipe, and drainage stone — engineered to hold grade for decades on Long Island soils..

35
Years serving Long Island
500+
Projects completed
4.9
Google review rating
Lic # 58161-H
NY License · Fully insured
What's built in

Details that separate
good work from great.

Four disciplines · One crew
№01

Engineered footings

Frost-depth compacted base or poured footing per wall height and load.

Included in every build
№02

Geogrid reinforcement

Geogrid tie-backs on any wall over 3 ft. — code-compliant and inspected.

Included in every build
№03

Full drainage

Perforated weep pipe, 3/4" drainage stone, and geotextile behind the wall.

Included in every build
№04

Cap & finish

Bull-nose, wash, or natural-stone caps set in polymer or mortar.

Included in every build
Why homeowners choose us

Why hire us
for Retaining Walls.

Licensed & insured

Suffolk County HIC License # 58161-H with full liability and workers' comp coverage.

35 years on Long Island

Family-owned and operating across Suffolk County since 1991.

Workmanship warranty

Every installation is backed in writing — base prep, drainage, and finish work included.

Free written estimate

On-site measure and a clear, itemized proposal before any work is scheduled.

The build · Five stages

Five steps. One crew.

A cohesive process engineered for durability and professional delivery.

  1. 01
    The Discovery

    Free estimate

    On-site measure, scope, and written proposal — no pressure, no upsell.

  2. 02
    The Blueprint

    Design & materials

    Layout, samples, and finishes confirmed before we mobilize.

  3. 03
    The Logistics

    Build

    Our own licensed crews — no subs — on-site daily until it's done right.

  4. 04
    The Build

    Walk-through

    Punch list closed, site cleaned, and written workmanship warranty issued.

Est. 1991 · Lic # 58161-H
What clients say · Verified Google reviews

Straight from
our neighbors.

4.9/ 5 average

Rated 4.9 on Google by homeowners across Suffolk County. Every project is warrantied in writing and completed by our own crew — no subs.

Read all reviews on Google

Ready to get started? Free on-site estimates across Suffolk County.

(631) 480-3238
Frequently Asked

Answers before
you call.

01

Do I need a permit for a retaining wall?

Anything over 4 ft. of exposed face typically needs a permit and stamped drawing. We handle it in-house.

02

Block or natural stone?

Segmental block is stronger and cheaper per foot; natural stone is more architectural. We build both.

03

How much does a retaining wall cost?

Most Suffolk County walls run $60–$150 per face foot depending on height, stone selection, and drainage requirements.

04

How long will a retaining wall last?

Built with a frost-depth base, geogrid, and full drainage, 40+ years. Walls that bow or lean almost always skipped one of those three.

05

Can you repair or rebuild a failing wall?

Yes. We assess whether it's a drainage failure or a base failure, then rebuild with proper tie-backs and weep drainage.

Financing Available

Build now.
Pay monthly.

Flexible monthly payment plans for patios, driveways, and outdoor living projects across Suffolk County. Licensed & insured. Free estimates.

60-120mo
Terms
Hearth
Lending Partner
Fast
Approval
Outdoor living space with patio built by APM O'Neill & Sons

Financing provided by Hearth. 60-120 month terms. Subject to credit approval. Rates and terms vary by lender.