What Harry Caswell does

Harry Caswell LLC is a privately held plumbing, mechanical, and utility contractor founded in 1989 and headquartered at 34836 Long Neck Road, Millsboro, Delaware. The company provides integrated plumbing, underground utility, fire protection, sewer inspection, and certified medical gas piping services to residential, commercial, and institutional customers across Delaware and Maryland's Eastern Shore. Its core customer mix spans homeowners, hotels, hospitals, restaurants, medical and dental offices, schools, prisons, mobile home parks, apartments, and condominiums, with 24/7/365 emergency response as a stated service standard.

Operationally, Harry Caswell delivers field service through approximately 11-50 employees dispatched from its single Millsboro headquarters, supported by specialized equipment such as sewer jetting rigs and Nassco-certified camera truck inspection systems. Its service portfolio is organized into seven lines: commercial plumbing, residential plumbing, residential fire protection, medical gas piping, sewer jetting and video inspection, utility services, and additional services (including water heater installation, tankless systems, sump pumps, garbage disposals, remodeling, and winterization). Revenue is generated through labor-based professional-services fees under quote-based pricing, with no publicly disclosed rates or contract structures.

The company's competitive position is anchored by a broad stack of multi-state and specialty contractor licenses — DE, MD, and NJ plumbing/HVAC credentials, ASSE 6010 / ASME IX medical gas certification, Nassco sewer inspection certification, fire protection, well drilling, and pump installation licenses — that few regional competitors can match. Go-to-market is primarily direct, driven by a prominently displayed 24/7 phone line, a website with contact forms, a Facebook presence, and longstanding local reputation across more than 25 Delmarva communities. The company is not venture- or PE-backed, has no disclosed M&A activity, and operates as a stable, owner-managed regional trade-services business.

Name

Harry Caswell

Legal name

Harry Caswell LLC

Website

https://harrycaswell.com

Company type

Private

Founded year

1989

Operating status

Operating

Headcount range

11–50 employees

Short description

Harry Caswell LLC is a privately held plumbing, mechanical, and utility contractor founded in 1989, serving residential, commercial, and institutional customers across Delaware and Maryland's Eastern Shore from its Millsboro, Delaware headquarters with 24/7 emergency service.

Ownership category

akta.pro rank

Product category

Plumbing and Utility Services

NAICS

Plumbing, Heating, and Air-Conditioning Contractors (238220), Plumbing, Heating, and Air-Conditioning Contractors (23822)

akta.pro primary industry

Pipe Installation, Repair & Repiping (HSAOAAAB)

Keywords

• Commercial plumbing services
• Residential plumbing services
• Medical gas installation
• Underground utility services
• Sewer inspection services

Headquarters

HQ city

Millsboro

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure, Supply Chain

Revenue model

1. Plumbing Services Revenue: Harry Caswell generates revenue through providing plumbing installation, repair, and maintenance services to residential and commercial customers. Services include commercial plumbing, residential plumbing, fire protection, sewer services, utility services, medical gas installation, and various additional services. Revenue is earned through service fees for labor and installation.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels3 records

Core offering

Harry Caswell LLC is a plumbing, mechanical, and utility contractor providing installation, repair, and maintenance services to commercial and residential customers across Delaware and Maryland's Eastern Shore. The company offers commercial plumbing, residential plumbing, residential fire protection, certified medical gas piping, sewer jetting and video inspection, underground utility contracting (sewer, water, fire mains), and additional services such as water heater installation, sump pumps, and kitchen/bath remodeling. Services are delivered by field crews dispatched from the Millsboro, DE headquarters with 24/7 emergency response.

Product overview

Harry Caswell is a plumbing and utilities service company offering a comprehensive suite of services through seven integrated offerings: Commercial Plumbing (new construction, renovations, gas systems, grease traps, back flow prevention), Residential Plumbing (pipe repair, fixture installation, general plumbing for homes and multi-family), Residential Fire Protection (sprinkler systems), Medical Gases (certified medical gas piping for healthcare facilities), Sewer Jetting and Videos (hydro jet cleaning and camera inspection), Utility Services (underground pipe installation and repair for water/sewer/fire systems), and Additional Services (water heaters, tankless systems, remodeling, winterization). The company operates as a unified service organization rather than a platform-plus-modules software product, serving Delaware and Maryland's Eastern Shore since 1989 with 24/7 emergency availability.

Differentiator

Problem solved

Functional benefit

Products and services

• Commercial Plumbing Comprehensive commercial plumbing services including new construction, renovations, gas system testing/installation/repair, grease trap installation and repair, back flow testing and prevention, and wet tapping for hotels, hospitals, restaurants, medical offices, schools, and prisons.
• Residential Plumbing Residential plumbing services covering pipe replacement and repair, toilet installation and repair, plumbing fixtures, and general plumbing repairs for mobile homes, modulars, apartments, and condos, including new construction and renovations.
• Residential Fire Protection Installation of residential fire sprinkler systems for homes to provide fire safety and protection, delivered under the company's Fire Protection FSC-0337 contractor license.
• Medical Gases Certified installation and service of medical gas systems including medical air piping, oxygen piping, nitrous oxide piping, and vacuum piping for hospitals, medical offices, veterinary offices, and dentist offices.
• Sewer Jetting and Videos Commercial and residential sewer cleaning including storm drains and soft digging, plus state-of-the-art camera truck inspection for city and private sewers, delivered under Nassco certification.
• Utility Services Licensed utility contracting for underground service pipes including sewer piping installation and repair, fire hydrants, fire mains, water lines, grease traps, storm drains, manholes, wet taps, and pumping service.
• Additional Services Installation, repair, and maintenance services including garbage disposal repair and installation, kitchen and bathroom remodeling, sump pumps, tankless water heaters, water heater installation and repair, and winterization.

Named customers9 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Five partnerships are on record, tiered minor and core.

• MoenminorOthersMoen is shown as a brand partner/supplier on the Harry Caswell website. Harry Caswell uses Moen plumbing fixtures and products for installations and repairs. This represents a supplier relationship rather than a formal partnership.
• American StandardminorOthersAmerican Standard is shown as a brand partner/supplier on the Harry Caswell website. Harry Caswell uses American Standard plumbing fixtures for installations and repairs. This represents a supplier relationship.
• RinnaiminorOthersRinnai is shown as a brand partner/supplier on the Harry Caswell website. Harry Caswell installs and services Rinnai tankless water heaters as part of their additional services. This represents a supplier/vendor relationship.
• NasscocoreTechnology or IntegrationHarry Caswell is Nassco certified (License U-412-15111) for sewer inspection and assessment services. Nassco is the National Association of Sewer Service Companies, providing certification standards for sewer inspection professionals. Harry Caswell uses Nassco-certified inspection methods including camera truck inspection of city and private sewers.
• Techno GooberminorOthersTechno Goober is identified as the web design company that designed the Harry Caswell LLC website. This is a vendor/contractor relationship for website design services.

Scale indicators2 records

Recent moves5 records

Expansion highlights5 records

Emerging players

• Cool Guy Mechanical: Delaware-based mechanical contractor offering plumbing and HVAC services in the Delmarva region. Comparable service mix and regional focus, smaller scale.

Direct peers

• Sobieski Mechanical Services: Large Delaware-based mechanical and plumbing contractor serving DE, MD, NJ, PA with commercial and residential plumbing, HVAC, and underground utility services. Overlaps Harry Caswell on utility, medical gas, and commercial plumbing work in the same geography.
• Tri-County Plumbing & Drain: Local Delaware plumbing and drain service company serving the Delmarva Peninsula. Direct competitor on residential plumbing and sewer services in overlapping geographies.
• Boulden Brothers: Delaware-based mechanical contracting and plumbing firm offering residential and commercial plumbing, heating, and cooling services across DE and Eastern Shore MD. Direct local competitor on service menu and service area.

Broad incumbents

• Benjamin Franklin Plumbing: National residential plumbing franchise with mid-Atlantic franchises competing on residential repair, drain, and water-heater services — directly comparable residential service model.
• Roto-Rooter Plumbing & Water Cleanup: National plumbing, sewer, and drain-cleaning franchise with strong mid-Atlantic presence. Competes on residential service, drain cleaning, and sewer jetting — overlap with Harry Caswell's residential and sewer service lines.
• Mr. Rooter Plumbing: National plumbing franchise offering residential and commercial plumbing services across the U.S., including the Eastern Shore area. Overlaps on residential service and trenchless sewer offerings.

Regional players

• Len the Plumber: Multi-location residential and commercial plumbing operator in the mid-Atlantic (DE, MD, PA, VA, DC, NJ). Closest scale-comparable peer with similar emergency-service model and commercial/residential breadth; serves overlapping Eastern Shore geography.
• Atlantic Mechanical Contractors: Eastern Shore/Mid-Atlantic mechanical contractor providing plumbing, HVAC, and utility services to commercial and institutional clients, including healthcare facilities. Comparable scope on commercial plumbing and medical gas.
• JW Plumbing, Heating & Air: Sussex County, Delaware-based plumbing and HVAC service provider. Direct local competitor targeting the same Western Sussex/Eastern Shore residential and light commercial market.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/people/Harry-Caswell-LLC/61571105203135/?_rdr
• LinkedInlinkedin.com/company/harry-caswell-inc

Compliance10 records

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 Harry Caswell