Duncan

What Duncan does

Duncan Seawall, Dock & Boat Lift, LLC is a privately held, full-service marine construction company founded in 1979 and headquartered at 1714 Independence Blvd, Sarasota, Florida. The company designs, permits, and builds waterfront infrastructure — primarily seawalls, custom docks, and boat lifts — for residential waterfront property owners and commercial marina operators across Sarasota, Manatee, Charlotte, and Pinellas counties in Southwest Florida. Duncan self-positions as Florida's largest residential marine contractor and Southwest Florida's largest marine contractor, and has held Golden Boat Lifts' designation as the #1 worldwide dealer for 12+ consecutive years.

The company's core technology is physical marine construction across multiple material systems: vertical, curved, stepped, and rubble-mound seawalls in concrete, vinyl, composite panels, steel, and wood; custom docks in pressure-treated lumber, tropical hardwood, composite (Trex, Azek), and recycled plastic; and Golden Boat Lifts installations in 4-post, 8-post, and elevator configurations. A proprietary differentiator is the use of Truline vinyl seawall panels with fillable voids for reinforced concrete seawall construction. Duncan holds three Florida contractor licenses (Marine Specialty Contractor A1346, CGC General Contractor 1517864, Electrical EC13005773), enabling in-house delivery of seawalls, docks, boat lifts, marine electrical services, and dredging.

The business model is project-based professional services revenue with custom quote-driven pricing after on-site assessment; no standardized pricing is publicly disclosed. Go-to-market is enterprise-style direct field sales: a regional sales team conducts on-site property visits, delivers detailed proposals through the in-house design center, and runs projects from permitting through cleanup with a published 24-hour response commitment. The company supplements direct sales with content marketing (educational blog, downloadable guides) and operates a recurring boat lift service function handling over 1,000 service calls per year. Revenue is generated through one-time construction projects for residential customers (primary segment) and commercial marina operators (secondary segment, up to 200-slip facilities).

Name

Duncan

Legal name

Duncan Seawall, Dock & Boat Lift, LLC

Website

https://duncanseawall.com

Company type

Private

Founded year

1979

Operating status

Operating

Headcount range

51–100 employees

Short description

Duncan Seawall, Dock & Boat Lift is a full-service marine construction company based in Sarasota, Florida, serving residential waterfront property owners and commercial marina operators across Southwest Florida with seawalls, docks, boat lifts, marine electrical, and dredging services.

Ownership category

akta.pro rank

Product category

Marine Construction Services

NAICS

Support Activities for Water Transportation (4883), Boat Building (336612)

SIC

Ship & Boat Building & Repairing (3730)

akta.pro primary industry

Breakwaters, Seawalls & Coastal Defense Structures (IMAFAJAC)

akta.pro secondary industries

Marine Piling & Deep Foundations (Jetties, Dolphins, Moorings) (IMAFAJAE), Port Rehabilitation, Maintenance & Asset Renewal (Repairs, Strengthening) (IMAFAJAL)

Keywords

• Marine construction services
• Seawall installation
• Custom dock building
• Boat lift installation
• Marine dredging services

Headquarters

HQ city

Sarasota

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Personnel, Supply Chain, Operations, Marketing or Sales, Others

Revenue model

1. Marine Construction Services: One-time project-based revenue from construction and installation services for seawalls, docks, boat lifts, and marine electrical systems. Projects range from residential repairs to commercial marina construction up to 200 slip facilities.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Duncan Seawall, Dock & Boat Lift is a full-service marine construction company that builds and repairs waterfront structures including seawalls (concrete, vinyl, composite, steel, wood), custom docks (residential to 200-slip marinas), Golden Boat Lifts, and marine electrical systems. The company manages projects end-to-end from permits to cleanup for residential and commercial clients across Southwest Florida.

Product overview

Duncan Seawall, Dock & Boat Lift is a full-service marine construction company offering a unified portfolio of waterfront services. The core offerings include seawall construction and repair (using concrete, vinyl, composite, steel, and wood materials), custom dock building (residential to commercial), Golden Boat Lift installation (as a top dealer), marine electrical services, commercial services, and dredging. Products are offered as integrated service packages from design through permitting to construction and cleanup, serving residential homeowners and commercial marina operators throughout Southwest Florida.

Differentiator

Problem solved

Functional benefit

Products and services

• Seawalls Marine construction service for shoreline protection structures including vertical, curved, stepped, and rubble mound seawalls. Materials include concrete, vinyl, composite panels, steel, and wood. For residential waterfront property owners and commercial marina operators in Southwest Florida.
• Docks Custom dock construction for residential and commercial properties, from personal watercraft docks to 200-slip marinas. Offers various decking materials including pressure-treated lumber, tropical hardwood, composite (Trex, Azek), and recycled plastic.
• Boat Lifts Installation of Golden Boat Lifts with options for 4-post, 8-post, and elevator configurations. Services include PWC lifts and GEM remote systems. Duncan is Golden's #1 worldwide dealer for over a decade.
• Electrical Services Marine electrical services including LED deck lighting, LED piling lights, vintage-style snook lights, underwater dock lighting, underwater fish lights, security lights, security faux cameras, solar kits, GEM remote boxes, and drum switches.
• Commercial Marine Services Full-service commercial marine construction including marina construction up to 200 slips, commercial dredging, and large-scale waterfront infrastructure projects.
• Dredging Services Marine dredging services for maintaining and improving waterfront properties, removing sediment buildup, and deepening waterways.

Quantifiable outcome

• Protects waterfront properties from over $10,000 per year in hurricane damage repairs; can save over $400,000 over seawall lifespan

Named customers2 records

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Partnerships

One partnership is on record.

• Golden Boat LiftscoreChannel Partner/ Reseller/ DistributorDuncan Seawall has been named Golden Boat Lifts #1 worldwide dealer every year for the past decade (12+ years consecutively). They install Golden Boat Lifts and are the exclusive dealer for this premium boat lift manufacturer.

Scale indicators4 records

Recent moves5 records

Expansion highlights5 records

Emerging players

• Walcon Marine: Walcon Marine designs and supplies aluminum pontoon and dock systems for marinas and recreational waterfronts. Comparable to Duncan on the dock/pontoon product side, but operates more as a supplier than a turnkey installer.
• Marinetek: Marinetek is a European-based marina pontoon and breakwater manufacturer with growing North American presence. Comparable to Duncan for concrete floating dock and marina construction, though Duncan adds residential seawall and lift work that Marinetek does not.

Broad incumbents

• Orion Group Holdings: Orion is a publicly traded heavy marine contractor providing marine construction, dredging, and specialty services to ports, governments, and private clients. Comparable to Duncan's commercial and dredging offerings but at vastly larger scale and more industrial/port-oriented focus.
• Bellingham Marine: Bellingham Marine is the largest global marina builder, designing and constructing concrete floating dock systems, seawalls, and marina infrastructure worldwide. Highly comparable to Duncan's commercial marina construction line of business, but at much greater scale and geographic reach.
• Cashman Equipment Corp. Cashman is a multi-disciplinary marine services company providing marine construction, equipment rental, and dredging across the U.S. East Coast and Gulf. Directly comparable to Duncan's commercial marine construction and dredging work, though much larger and more diversified.

Regional players

• Atlantic Marine Construction: Atlantic Marine Construction is a Florida-based marine contractor providing seawall, dock, and shoreline protection services. The most direct regional peer to Duncan in terms of service mix, scale, and customer profile.
• Trevcon Construction Company: Trevcon is a Northeast-based marine and heavy civil contractor performing pile driving, dock, and waterfront infrastructure work. Comparable to Duncan on the structural pile/dock side, though operating in a different geography.
• ICON Equipment: ICON Equipment is a Southeast U.S. marine construction and equipment provider offering shoreline protection, dock, and bulkhead work. Closely comparable to Duncan's seawall, dock, and bulkhead construction services in the regional market.
• Coastal Marine Construction: Coastal Marine Construction provides marine construction, seawall, and dock services in Florida and the Southeast. Closely comparable to Duncan across residential and light commercial waterfront projects in the same regional market.

Direct peers

• Meeco Sullivan: Meeco Sullivan is a U.S.-based manufacturer and builder of galvanized steel and aluminum marinas, docks, and boat lifts. Direct overlap with Duncan's dock construction, boat lift installation, and marina development services.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights7 records

Customer concentration

• Xx.com/DuncanSeaSRQ

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Duncan