Byrne & O'Neill

What Byrne & O'Neill does

Byrne & O'Neill, LLP is a privately held New York-based boutique law firm (LLP) concentrating in all aspects of professional liability, construction, and design law. The firm serves design professionals and construction-industry clients — including architects, engineers, owners, developers, contractors, sureties, consultants, accountants, attorneys, and other licensed professionals — across New York, New Jersey, and Connecticut. Its core product set comprises four interconnected service lines: Litigation Services (representation in state and federal courts, arbitration panels, and administrative forums); Risk Management Advisory (contract review, internal practice assessment, and strategic claim-prevention planning); Corporate Services (entity formation, multi-state practice authorization, and M&A support); and Transactional Services (drafting and negotiation of design and construction contracts, partnership agreements, NDAs, copyright assignments, and termination agreements, including projects based in the United States and internationally).

The firm is staffed by ten attorneys — four partners (Michael J. Byrne, Kevin J. O'Neill, Elaine C. Gangel, Albert W. McKee) and at least two associates (Mark R. McCauley, Paul Novak) — with partners personally handling all client files. Revenue is generated exclusively through professional-services legal fees on a quote-based, matter-by-matter pricing structure; no productized, subscription, or technology-mediated revenue streams exist. The firm has maintained an "AV" (Excellent) Martindale-Hubbell rating for many years and is led by partners with embedded positions across ACEC, ASFE, AIA, and the New York State Bar Association's professional liability committee, which function as primary referral pipelines.

The business is operating at a small scale (10 attorneys, single headquarters at 26 Broadway in Manhattan), with no disclosed funding, no subsidiaries, no parent entity, and no acquisition history. There are no proprietary technology products, APIs, or AI capabilities in evidence; the offering is wholly human-capital-driven, with the firm's competitive position resting on attorney experience, partner-led service delivery, regional court expertise, and institutional affiliations within the design-professional and construction-bar communities.

Name

Byrne & O'Neill

Legal name

Byrne & O'Neill, LLP

Website

https://bonlaw.com

Company type

Private

Founded year

2017

Operating status

Operating

Headcount range

11–50 employees

Short description

Byrne & O'Neill, LLP is a New York-based boutique law firm specializing in professional liability, construction, and design law, serving architects, engineers, contractors, developers, and other professionals across New York, New Jersey, and Connecticut.

Ownership category

akta.pro rank

Product category

Construction & Design Law Services

NAICS

Legal Services (5411)

SIC

Services-Legal Services (8111)

akta.pro primary industry

Management Liability (D&O/EPL/Fiduciary) (FSAJAGAD)

akta.pro secondary industry

Construction Specialty (Wrap-Ups/Builders Risk/Contractors) (FSAJAGAH)

Keywords

• Construction law services
• Professional liability law
• Design law services
• Legal risk management
• Construction litigation

Headquarters

HQ city

New York

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations

Revenue model

1. Legal Services - Professional Liability and Construction Law: The firm provides legal support and business advisory services in professional liability and construction/design law. Revenue is generated through legal fees for litigation, risk management, corporate, and transactional services rendered to professional clients.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels2 records

Core offering

Byrne & O'Neill, LLP is a law firm that provides legal representation and business advisory services in professional liability, construction, and design law. Its offerings include Litigation Services in state and federal courts and arbitration, Risk Management Advisory for proactive claim prevention, Corporate Services for business formation and expansion, and Transactional Services for drafting and negotiating design and construction contracts, partnership agreements, and related documents for architects, engineers, contractors, developers, and other professionals.

Product overview

Byrne & O'Neill, LLP is a law firm offering a unified suite of legal services focused on professional liability, construction, and design law. The firm provides four interconnected core service offerings: Litigation Services for dispute resolution in courts and arbitration; Risk Management Advisory for proactive claim prevention; Corporate Services for business formation and expansion; and Transactional Services for contract drafting and negotiation. These services are delivered by ten attorneys with extensive experience representing architects, engineers, contractors, and other design professionals throughout New York, New Jersey, and Connecticut.

Differentiator

Problem solved

Functional benefit

Quantifiable outcome

• Hundreds of disputes involving tens of millions of claim dollars handled through trials, arbitration, mediation, and negotiation

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Scale indicators4 records

Recent moves5 records

Expansion highlights2 records

Broad incumbents

• Smith, Currie & Hancock LLP: One of the largest U.S. construction law firms with a national footprint. Both firms serve contractors and design professionals in construction litigation and contract matters, though Smith Currie operates at significantly greater scale with offices across multiple states.
• Peckar & Abramson, PC: Major construction law firm with national reach, serving contractors, owners, and design professionals. Comparable practice mix in construction litigation and contract negotiation, though significantly larger and more geographically diversified.

Direct peers

• Watt, Tieder, Hoffar & Fitzgerald, LLP: National construction and government contracts law firm representing contractors, sureties, and design professionals. Highly comparable to Byrne & O'Neill in serving the A&E and surety community on professional liability and construction disputes.
• Traub Lieberman Straus & Shrewsberry LLP: Mid-size law firm with strong professional liability and construction practices serving architects, engineers, and other professionals. Overlaps directly with Byrne & O'Neill's core client base in NY/NJ/CT.
• Garson, Segal, Steinmetz, Fladgate LLP: New York-based boutique law firm focused on construction, design professional liability, and surety law. Closely comparable in size, specialization, and client base to Byrne & O'Neill within the same NY/NJ metro market.
• L'Abbate, Balkan, Colavita & Conti, LLP: Long-standing New York-based law firm representing design professionals, contractors, and sureties in construction and professional liability matters. Direct competitor in the NY/NJ/CT A&E legal market.
• Zetlin & De Chiara LLP: New York construction and design law boutique representing architects, engineers, contractors, and owners. Highly comparable in size, specialization, and geographic focus to Byrne & O'Neill.
• Mound Cotton Wollan & Greengrass: Established New York-based law firm with a professional liability and insurance defense practice serving architects, engineers, and other licensed professionals. Direct competitor in the NY metro design professional defense market.
• Aronowitz, Skidmore, Lentz & Cappelli: New Jersey-based boutique law firm focused on construction law and professional liability defense for design professionals. Comparable practice footprint in the NY/NJ regional market.

Regional players

• Cohen Seglias Pallas Greenhall & Furman PC: Construction law firm with strong Mid-Atlantic presence serving design professionals, contractors, and sureties. Comparable practice areas but primarily based in Philadelphia rather than NY/NJ/CT.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights6 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

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 Byrne & O'Neill