R.W. Warner
R.W. Warner, Inc. is a third-generation, family-owned commercial mechanical contractor in Frederick, MD providing HVAC, plumbing, electrical, sheet metal fabrication, and general construction services to enterprise, institutional, healthcare, and government clients across the Mid-Atlantic region.
- Company typePrivate
- Founded1937
- HeadquartersFrederick, United States
- Headcount—
- GTM typeB2B
- OfferingServices
What R.W. Warner does
R.W. Warner, Inc. is a third-generation, family-owned commercial mechanical contracting firm headquartered at 217 Monroe Avenue in Frederick, Maryland. Founded in 1937 originally as a small plumbing business, the company has grown into an integrated four-division platform delivering HVAC and plumbing services (Warner Mechanical), precision sheet metal fabrication and installation (Kaempf & Harris Sheet Metal), general contracting and construction management (Warner Construction), and electrical contracting (Williams Electric). It serves commercial, industrial, institutional, and government clients — including named accounts in education, healthcare, pharmaceutical manufacturing, and federal research — across Western Maryland, Northern Virginia, and parts of West Virginia.
The company's service offering spans the full mechanical and construction stack: design-build, pre-construction consulting, new construction installation, renovations, and 24/7 emergency service across both commercial and residential properties. Kaempf & Harris operates a state-of-the-art fabrication facility with capacity exceeding 500 tons per year, allowing the group to control sheet metal quality from raw fabrication through on-site installation — a capability the company has used to pursue federal-grade projects that require U.S. Army Corps of Engineers CQMC and EM-385-1-1 compliance, OSHA-trained supervisory staff, and ABC STEP Platinum safety performance.
R.W. Warner generates revenue on a project-based, quote-by-project basis using a single direct B2B sales motion: customers reach the company primarily by phone, website contact form, or referral. Pricing is not publicly disclosed; estimates are valid for 30 days and payment is typically due upon completion, accepted via credit card, check, or electronic bank transfer. There are no public pricing tiers, no subscription or recurring-revenue offering, and no external fundraising. The company is led by third-generation CEO Matt Warner (since 1998), with Frederick Niehoff as EVP/CFO and Joseph Frank as Secretary-Treasurer/Corporate Controller, operating without institutional ownership, venture capital, or private equity backing.
R.W. Warner firmographics
Firmographics- Name
- R.W. Warner
- Legal name
- R.W. Warner, Inc.
- Website
- https://rwwarner.com
- Company type
- Private
- Founded year
- 1937
- Operating status
- Operating
- Short description
- R.W. Warner, Inc. is a third-generation, family-owned commercial mechanical contractor in Frederick, MD providing HVAC, plumbing, electrical, sheet metal fabrication, and general construction services to enterprise, institutional, healthcare, and government clients across the Mid-Atlantic region.
- Ownership category
- akta.pro rank
R.W. Warner industry classification
Industry- Product category
- Commercial Mechanical Contracting
- NAICS
- Electrical Equipment Manufacturing (33531), Electrical Apparatus and Equipment, Wiring Supplies, and Related Equipment Merchant Wholesalers (42361)
- SIC
- Power, Distribution & Specialty Transformers (3612), Miscellaneous Electrical Machinery, Equipment & Supplies (3690)
- akta.pro primary industry
- Power Cables & Conductors (LV/MV cables, flexible cables, bus wire, armored cable) (IMAGAEAC)
Keywords
Where R.W. Warner is headquartered
LocationHeadquarters
- HQ city
- Frederick
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
R.W. Warner business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Infrastructure, Supply Chain, Marketing or Sales
Revenue model
- Mechanical Contracting Services: R.W. Warner generates revenue through providing integrated mechanical, electrical, plumbing, HVAC, and sheet metal fabrication services to commercial, industrial, institutional, and government clients. Revenue is project-based, generated from construction contracts, service agreements, and installation projects across its four divisions.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Pay-as-you-go | Project-based pricing |
Go-to-market motion1 record
Distribution channels1 record
Marketing channels5 records
R.W. Warner product offering
Product offeringCore offering
R.W. Warner is a multi-division commercial mechanical contracting firm that delivers integrated HVAC, plumbing, electrical, sheet metal fabrication, and general construction services to commercial, industrial, institutional, and government clients. The company operates four specialized divisions (Warner Mechanical, Warner Construction, Kaempf & Harris Sheet Metal, and Williams Electric) that together provide design-build, installation, fabrication, and 24/7 emergency response across the Mid-Atlantic region from its Frederick, Maryland headquarters.
Product overview
R.W. Warner, Inc. is a third-generation family-owned commercial construction and mechanical contracting firm founded in 1937, headquartered in Frederick, Maryland. The company operates as a unified platform of four specialized divisions — Warner Mechanical (HVAC and plumbing), Kaempf & Harris Sheet Metal (custom sheet metal fabrication and installation), Warner Construction (general contracting and construction management), and Williams Electric (electrical contracting) — that together deliver comprehensive mechanical, electrical, sheet metal, and general construction services across commercial, industrial, institutional, and government sectors in Frederick, MD, Western Maryland, Northern Virginia, and parts of West Virginia. Each division functions as a distinct brand with its own service offerings and website, coordinated under the parent R.W. Warner corporate umbrella with shared quality, safety, and accountability standards.
Differentiator
Problem solved
Functional benefit
Products and services
- Warner Mechanical HVAC and plumbing services division providing heating repair and installation, cooling/AC services, drain cleaning, pipe repair, water heater services, and 24/7 emergency response for residential and commercial properties in Frederick, MD and surrounding region.
- Kaempf & Harris Sheet Metal Sheet metal fabrication and installation division specializing in custom metal solutions, HVAC ductwork, and custom components for commercial, industrial, and institutional projects. Operates a state-of-the-art fabrication shop with capacity exceeding 500 tons per year.
- Warner Construction General contracting and construction management division providing pre-construction, construction management, and design-build services from conception through completion for commercial, industrial, institutional, and residential projects.
- Williams Electric
Quantifiable outcome
- EMR of .62 (industry-besting)
- +2 more outcomes
Companies that use R.W. Warner
Customer profileNamed customers6 records
Segments5 records
Ideal customer profiles3 records
R.W. Warner technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
R.W. Warner partnerships and signals
Strategic signalPartnerships
One partnership is on record.
- Subcontractors and SupplierscoreWarner Construction maintains strong partnerships with trusted subcontractors and suppliers who share their commitment to quality, service, and ethical business practices. Interested subcontractors and suppliers are encouraged to complete a questionnaire to explore potential collaboration opportunities.
Scale indicators6 records
Recent moves7 records
Expansion highlights4 records
R.W. Warner competitors and assessment
Company assessmentDirect peers
- Limbach Holdings: Public multi-trade mechanical contractor (HVAC, plumbing, electrical) serving commercial, institutional, and industrial customers across multiple U.S. regions. Closest direct peer to R.W. Warner given integrated service model and similar customer verticals.
- IES Holdings: Provider of electrical and mechanical infrastructure services for commercial, industrial, and residential markets including data centers. Comparable business mix to R.W. Warner with both electrical contracting (like Williams Electric) and mechanical work.
- MYR Group: Public specialty contractor focused on electrical construction for transmission, distribution, and commercial/industrial markets. Direct comparable for the Williams Electric division's commercial and industrial electrical contracting work.
- Holders Construction: Mid-Atlantic and Midwest general contractor and construction manager serving commercial, institutional, and healthcare clients. Direct comparable to R.W. Warner's Warner Construction division on project type and customer mix.
Broad incumbents
- EMCOR Group: Fortune 500 provider of mechanical and electrical construction, energy, and facilities services across commercial, industrial, utility, and institutional markets. National incumbent with deep capabilities that mirror R.W. Warner's four-division platform at vastly greater scale.
- Quanta Services: Large infrastructure contractor serving the electric, oil & gas, telecom, and renewable energy industries. Comparable for the utility-scale electrical contracting and government infrastructure work that R.W. Warner's certifications qualify it to bid on.
- APi Group: Global provider of safety, specialty, and industrial services including fire suppression, HVAC, and electrical. Overlaps with R.W. Warner's mechanical and electrical contracting capabilities and government/institutional customer base.
- Comfort Systems USA: Large national mechanical contractor specializing in HVAC, plumbing, piping, and building automation for commercial and industrial clients. Overlapping service lines and customer base make it a broad comparable for R.W. Warner's Warner Mechanical division.
Others
- Welspun Enterprises: Infrastructure and construction company active in India and the U.S. with capabilities in water, transportation, and building services. Thematically comparable as a multi-disciplinary contractor operating in regulated environments.
Regional players
- B.R. Friesen & Associates: Regional Mid-Atlantic mechanical contractor providing HVAC, plumbing, and energy services to commercial and institutional clients. Geographic and service overlap with R.W. Warner's Frederick-based operations.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat4 records
Key risks6 records
Key highlights7 records
Customer concentration
R.W. Warner social profiles
Digital presenceR.W. Warner compliance and trust
Trust signalCompliance6 records
R.W. Warner financial estimates
Financial estimateRevenue estimate
Valuation estimate
R.W. Warner leadership team
Management profileNumber of profiles
Profiles3 records
R.W. Warner subsidiaries and ownership
Company hierarchySubsidiaries4 records
R.W. Warner funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
R.W. Warner M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about R.W. Warner
What does R.W. Warner do?
R.W. Warner is a multi-division commercial mechanical contracting firm that delivers integrated HVAC, plumbing, electrical, sheet metal fabrication, and general construction services to commercial, industrial, institutional, and government clients. The company operates four specialized divisions (Warner Mechanical, Warner Construction, Kaempf & Harris Sheet Metal, and Williams Electric) that together provide design-build, installation, fabrication, and 24/7 emergency response across the Mid-Atlantic region from its Frederick, Maryland headquarters.
Is R.W. Warner a public or private company?
R.W. Warner is a private company. It is classified as family owned and is currently operating.
When was R.W. Warner founded?
R.W. Warner was founded in 1937.
Where is R.W. Warner based?
R.W. Warner is headquartered in Frederick, United States, in the North America region.
How does R.W. Warner make money?
One revenue line is on record: mechanical Contracting Services.
Who are R.W. Warner's main competitors?
Direct peers on record are Limbach Holdings, IES Holdings, MYR Group and Holders Construction. Broad incumbents are EMCOR Group, Quanta Services, APi Group and Comfort Systems USA. Welspun Enterprises is listed as an others. B.R. Friesen & Associates is listed as a regional player.
Does R.W. Warner have an API?
No public API is recorded for R.W. Warner.
What industry is R.W. Warner in?
R.W. Warner's product category is Commercial Mechanical Contracting. Its primary akta.pro industry code is IMAGAEAC, Power Cables & Conductors (LV/MV cables, flexible cables, bus wire, armored cable). Its NAICS code is 33531 and its SIC code is 3612.