Licensed & Insured — Orange County, CA

We keep
water out.

L3 Energy Construction delivers waterproofing solutions for homes and commercial buildings across Orange County. From foundations to rooftop decks — guaranteed protection.

Get Free Estimate → Call (949) 612-4046
500+Projects
25+Years
100%Satisfaction
Why L3

The complete waterproofing solution.

Unlike testing-only companies, we find the problem and fix it. One team, one call, total protection.

01

Full-Service Contractor

Detection, repair, and prevention under one roof. No middlemen or handoffs between companies.

02

Licensed & Certified

CSLB licensed, fully bonded and insured. Trained in the latest waterproofing methods and building codes.

03

Transparent Pricing

Detailed line-item estimates before work begins. The price we quote is the price you pay — no surprises.

04

Emergency Response

Water damage can't wait. We offer rapid-response service to stop leaks and protect your property fast.

05

Fast Turnaround

Same-week assessments. Most residential jobs finished in 2–5 days. We work around your schedule.

Services

What we protect.

Foundation Waterproofing

▼

Exterior and interior membranes, drainage systems, and vapor barriers. We protect your home's most critical structure from hydrostatic pressure and groundwater intrusion.

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Basement Waterproofing

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Sump pumps, sealants, and complete drainage systems. Interior and exterior solutions to keep your basement permanently dry — no matter the season.

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Deck & Balcony

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Waterproof coatings, membranes, and drainage for decks, balconies, and rooftop terraces. Stop water from intruding into the spaces below.

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Commercial Waterproofing

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Parking structures, plazas, multi-unit residential. Large-scale solutions with dedicated project management and full code compliance.

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French Drain Systems

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Redirect groundwater away from your foundation. Prevent flooding, soil erosion, and hydrostatic pressure buildup before it becomes a problem.

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Concrete Sealing & Coating

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Epoxy, polyurethane, and penetrating sealers for driveways, garage floors, and exterior surfaces. Long-lasting protection that looks great.

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How It Works

Three steps. Done right.

We kept it simple so you can focus on what matters.

1

Free Assessment

Book in 30 seconds. We inspect on-site the same week and deliver a detailed, no-obligation estimate.

2

Custom Solution

We design a waterproofing plan tailored to your property — the right materials for your situation and budget.

3

Expert Install

Licensed crew completes the work on schedule, cleans up, and ensures everything meets code.

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Reviews

What our clients say.

"Very knowledgeable with cost effective construction solutions."
JF
Jim Fitzpatrick
Google Review
"L3 Energy Construction / Water Intrusion Specialists exceeded my expectations from start to finish."
DM
Davion Morgan
Google Review
"The quality of work is top-tier. They showed a level of expertise and attention to detail that truly sets them apart."
EC
Evan Cacatian
Google Review
"Working with these guys was a great experience, everyone was very professional from start to finish. I highly recommend bringing your business here, I definitely will be back!"
ZM
Zander Minniti
Google Review
"Had a 10/10 experience and would highly recommend! They truly were so considerate and made my experience outstanding. Definitely using again."
JC
Jack Coleman
Google Review
"Nolan Rogers gave this a 5-star review."
NR
Nolan Rogers
Google Review
Our Founder

Built on Decades of Expertise

L3 Energy Construction was founded by Nathan McDonnell, who began his career in residential construction in 1986. He later founded Hydrotech Construction (1999–2021), specializing in water intrusion; Tariff Power (2010–2016), specializing in large-scale solar; Rove Charging (2018–2023), building large-scale EV charging centers; and L3.Energy in 2024.

Nathan has worked with many local law firms ensuring businesses and homeowners are made whole from contractor oversights or defects. Today he continues helping businesses and homeowners across Newport Beach, Newport Coast, Corona Del Mar, and surrounding areas.

"We bring nearly four decades of hands-on experience to every project — from diagnosing hidden water intrusion to designing energy-resilient systems that keep the lights on when everyone else's go dark."

1986Career begins in residential construction
1999–2021Hydrotech Construction — water intrusion specialist
2010–2016Tariff Power — large-scale solar
2018–2023Rove Charging — large-scale EV charging centers
2024L3.Energy Construction — founded
Nathan McDonnell, Founder of L3 Energy Construction
Coverage

Coastal & Southern California.

Professional waterproofing from Los Angeles to San Diego and everywhere in between.

Redondo BeachCoastal Protection Hermosa BeachBeachfront Homes Manhattan BeachOceanfront Specialist Palos VerdesBluffs & Hillside TorranceCoastal Residential Long BeachCoastal & Commercial Seal BeachBeachfront Protection Huntington BeachCoastal Protection Newport BeachCoastal Waterproofing Corona Del MarOceanfront Homes Laguna BeachHillside & Coastal Laguna NiguelCoastal Residential Dana PointOceanfront Protection San ClementeCoastal Homes OceansideNorth County Coastal CarlsbadCoastal Homes EncinitasBeachfront & Bluffs Del MarLuxury Coastal La JollaOceanfront Specialist San DiegoCoastal & Commercial
FAQ

Common questions.

If you don't see your question here, give us a call — we're happy to help.

Residential waterproofing in OC typically ranges from $3,000–$15,000 depending on scope, foundation type, and materials. Exterior foundation work runs higher due to excavation; interior solutions like sealants and French drains are more cost-effective. We provide free estimates with line-item pricing — no hidden fees.
Most residential projects take 2–5 days. Deck coatings: 1–2 days. Full exterior foundation or commercial work: 1–3 weeks. We provide a detailed timeline during your free assessment.
Damp proofing only resists water vapor — it can't withstand hydrostatic pressure. True waterproofing creates a complete barrier against both vapor and liquid water. Many older OC homes were only damp-proofed during construction, which is often the root cause of foundation moisture problems.
Insurance typically covers sudden water damage (burst pipe) but not preventive waterproofing. That said, waterproofing is one of the smartest investments — it prevents mold, protects structure, and increases property value at a fraction of what major water damage repair costs.
Dry months (May–October) are ideal. But if you have active water intrusion, don't wait — we offer emergency services year-round. Delaying leads to mold, structural issues, and significantly higher repair costs.
Signs: damp or musty smells, water stains on walls, white mineral deposits on concrete, peeling paint in lower levels, standing water after rain, foundation cracks, or mold growth. If you notice any of these, schedule a free assessment — early action saves money.
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What do you need?

Select all that apply.

Foundation
Basement
Deck / Balcony
Exterior Walls
French Drain
Concrete Seal
Commercial
Not Sure
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How urgent?

Why book with L3?

Free Assessment

No cost, no obligation.

Same-Week Availability

Usually 2–3 business days.

Transparent Pricing

Detailed written estimates.

Licensed & Insured

CSLB licensed. Fully bonded.

Prefer to talk?

Humans answer the phone here.

(949) 612-4046

Mon–Fri 10am – 6pm

Ready to protect your property?

Free, no-obligation assessment from OC's trusted waterproofing experts.

Book Free EstimateCall (949) 612-4046

Need waterproofing? Book a free assessment — same-week availability.

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