Foundation Repair in Suffolk County, Long Island — APM O'Neill & Sons

Foundation work
that keeps water out.

Foundation parging, crack repair, waterproof coatings, and drainage tie-ins for block and poured foundations.

Call (631) 480-3238 Get Your Free Estimate

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

Crack repair

Hydraulic cement, epoxy injection, or urethane depending on crack type and load.

Included in every build

№02

Parging

Full parge coat over block or poured foundations with fiber-reinforced mix.

Included in every build

№03

Waterproof membrane

Rubberized asphalt or elastomeric membrane on excavated exterior.

Included in every build

№04

Drainage tie-in

Footing drain / dry-well tie-in where downspouts and grade allow.

Included in every build

Why homeowners choose us

Why hire us
for Foundation Repair.

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.

Get a Free Estimate (631) 480-3238

The build · Five stages

Five steps. One crew.

A cohesive process engineered for durability and professional delivery.

01
The Discovery
Free estimate
On-site measure, scope, and written proposal — no pressure, no upsell.
02
The Blueprint
Design & materials
Layout, samples, and finishes confirmed before we mobilize.
03
The Logistics
Build
Our own licensed crews — no subs — on-site daily until it's done right.
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.

Is my foundation crack serious?

Vertical hairline cracks are usually cosmetic. Horizontal, stepped, or widening cracks need a professional look — we'll tell you honestly.

Do you excavate?

Yes, when interior fixes won't stop water intrusion.

Do you fix leaking foundation walls?

Yes — crack injection, parging, exterior waterproofing, and drainage correction depending on the cause.

Is a cracked foundation always structural?

No. Hairline shrinkage cracks are common. Stair-step or widening cracks need evaluation, and we'll tell you honestly which one you have.

Do you need an engineer?

For structural repairs and permits, yes — we work with licensed engineers and handle the filing.

Where we work

Foundation Repair across
all of Suffolk County.

Serving Long Island's South Shore and central corridor. Licensed, insured, and locally owned — 35 years building for the towns listed below and every Brookhaven and Islip neighborhood in between.