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50+ Years
experience
Award-Winning Architectural Design Services in Silver Spring, MD
O'Neill Architects has been delivering cost-efficient and tasteful architectural designs for over 50 years, establishing itself as a trusted leader in the industry. Our firm specializes in a diverse range of projects, including historic buildings, multifamily facilities, shopping centers, office buildings, judicial centers, and resorts. With a commitment to sustainable living, we integrate innovative technologies such as geothermal heat pumps and solar panels to create energy-efficient spaces that benefit both clients and the environment. Our work has earned numerous design awards, reflecting our dedication to excellence and client satisfaction.

We serve communities across Maryland, Virginia, South Carolina, and Puerto Rico, offering expertise in historic rehabilitation, community planning, and multifamily housing. Our team, led by managing partner Stephen ONeill, brings decades of experience and a deep understanding of architectural innovation to every project. Clients consistently praise our attention to detail and ability to transform complex urban spaces into functional, family-friendly environments. As a firm rooted in tradition yet forward-thinking in sustainability, we continue to shape the architectural landscape with designs that inspire and endure.
Services
Architectural Design Historic Restoration Sustainable Architecture Community Planning Multifamily Rehabilitation Judicial Center Design Resort Development Elderly Housing Solutions Commercial Building Design Energy-Efficient Renovations
Details
  • Year established: 1958
Highlights and features
  • We have over 50 years of experience in architectural design and historic rehabilitation.
  • Our team specializes in sustainable practices, including geothermal and solar energy integration.
  • We hold numerous design awards for excellence in multifamily, commercial, and community projects.
  • Our architects are licensed in multiple states and bring deep local market knowledge.
  • We prioritize client collaboration and attention to detail from concept to completion.
What people say
Award-winning designs Sustainable practices Historic rehabilitation expertise Client-focused approach Decades of experience
Services
Architectural Design
O'Neill Architects creates innovative, cost-efficient designs for commercial, residential, and institutional buildings. Our team combines functionality with aesthetic appeal, ensuring projects meet client needs while adhering to sustainability standards. With expertise in diverse sectors, we deliver tailored solutions that enhance community spaces and maximize property value.
Historic Restoration
We specialize in preserving historic structures while integrating modern functionality. Our approach maintains architectural integrity through meticulous research and material selection. Clients benefit from our deep knowledge of period-specific techniques and compliance with preservation guidelines, ensuring timeless restorations that honor historical significance.
Sustainable Architecture
Our sustainable designs prioritize energy efficiency and environmental responsibility. We implement geothermal systems, solar panels, and passive solar strategies to reduce ecological footprints. These solutions lower operational costs for clients while promoting eco-conscious development aligned with global sustainability goals.
Community Planning
We design holistic community spaces that balance residential, commercial, and recreational needs. Our plans emphasize walkability, green spaces, and infrastructure efficiency. By collaborating with stakeholders, we create vibrant, future-ready neighborhoods that adapt to evolving urban demands.
Multifamily Rehabilitation
Our team revitalizes multifamily housing to meet modern living standards while preserving affordability. We address structural upgrades, energy efficiency, and amenity enhancements. This service extends property lifespans and improves tenant satisfaction through thoughtful, code-compliant renovations.
People
Stephen ONeill
Managing Partner
Licensed architect in five U.S. states and D.C., Stephen ONeill leads O'Neill Architects with over 40 years of experience. A University of Maryland honors graduate since 1982, he transformed Collins & Kronstadt into a renowned firm. His expertise spans sustainable design and large-scale developments, driving the firms innovation and industry leadership.
Questions
What services does O'Neill Architects offer?
We specialize in architectural design, historic restoration, sustainable buildings, community planning, and multifamily rehabilitation projects.
How long has O'Neill Architects been in business?
Our firm has over 50 years of experience, established in 1958 with a legacy of innovative design.
Do you focus on sustainable architecture?
Yes, we integrate geothermal systems, solar panels, and energy-efficient designs to create environmentally responsible buildings.
How can I schedule a consultation?
Contact us at 301-587-8642 or visit our Silver Spring office to discuss your architectural needs.
What areas do you serve?
We work across Maryland, Virginia, South Carolina, Puerto Rico, and the District of Columbia.
What awards has your firm received?
We've earned numerous design awards for excellence in historic, commercial, and sustainable architecture projects.