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Fri: 8:00am - 12:00pm
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    Unparalleled service
    and attention to detail
    We are experts in architectural planning,
    design, development, and construction.
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    Creating solid foundations
    PDIA is a full-service architecture firm focused on
    building strong partnerships across the Southeast.
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    Every detail matters
    We bring honesty and integrity
    to each and every development client.

We are Specialized

PDIA excels in comprehensive architecture services, and multifamily, commercial and assisted living facility development projects.

Learn more about our specialty: large multifamily developments, apartment complexes and new residential construction projects.

We provide full architecture services for senior living, assisted care and rehabilitation development projects.

View our development portfolio for business and office spaces, retail, restaurants, mixed use, and small medical facilities.


Striving to provide the best architectural services in the Southeast

Clemson University graduate Pat Iannelli is the founder and president of PDI Architecture. Pat and his team have decades of experience in architecture development, design, planning, construction and management, and have designed developments totaling over $950 million in construction costs. We believe attention to detail is the key to success and client satisfaction. Learn more about our firm and commitment to quality.

Why hire an architect?

What Our Clients Say?

PDI Architecture completed three rehab projects with us, each with 100+ units, and is slated to begin two more projects this year. They are extremely knowledgeable in Housing Authority programs; administrations of design, drawing and construction; accessibility and building codes; and all matters of construction. We look forward to working with PDI Architecture on future projects. Read More

James Kerr Sr.

Chairman, AMCS

I want to express my sincere thanks for a well-executed 55 unit apartment project. PDI Architecture was outstanding and truly professional. We produced the finest quality apartments in Greenville, and your team is responsible for the excellent design and follow-through. 98 E. McBee sets the highest standards for apartments in the community and is a terrific testament to your firm's talents. Read More

D. Grant Peacock

98 E. McBee

Your experience with HUD financing has been extremely beneficial to the entire team. You orchestrated the entire design team with professionalism, and I know that HUD holds your firm in high regard. We rely on your firm to manage the different state design requirements and your design work has been met with considerable success. I look forward to many continued projects and success between our firms. Read More

Craig Descalzi

Founder & CEO, Morrison Avenue Capital Partners

I’d like to express my appreciation for your work over the past 20 years. You designed over 2,000 multi-family units for me in North and South Carolina. You are creative and technically proficient, and appreciate budget constraints. You are always helpful in resolving inevitable construction problems with large development projects. I like your work so much that I prevailed upon you to design my home! I look forward to working with you and share my recommendation with all potential clients. Read More

John H. Crabtree, III

President, Meridia, Inc.

The success of the “Christopher Towers Rehab” project pivoted on well thought-out planning, exacting blueprints and tireless attention to detail. We got that from your team and much more. You were first rate, and your personal attention and involvement was tantamount to the overall success. You hit every mark and made the process as painless as possible. Your great rapport with HUD and understanding of their expectations and timetables made our lives immeasurably easier. Thank you for your execution of our vision and all your hard work. Read More

Anthony W. LaCaprucia

President, Board of Directors, The Navigator Corp.

We greatly appreciate the many charitable projects you completed for our parish over the past few years. Your design of our conference rooms, administrative offices and ministry offices made a huge difference in our work environment, and our parishioners' convenience and attendance. Your expertise, supervision, inspections, patience, accessibility and can-do attitude is invaluable. Doing all this free for our church is going above and beyond! Your kindness to us and the community can't be measured, and reflects your generous character. Read More

Fr. Rafael Castano

Sacred Heart of Jesus Catholic Church

I have worked with Pat lanelli for over 12 years on a variety of new construction and sub rehabilitation projects. He is my architect-of-choice on all my projects due to his responsiveness, attention to detail, and willingness to go above and beyond. There are few professionals and third parties to whom I can give a genuine four-star rating. PDIA and Pat lanelli have earned that rating from Multifamily Associates, Inc. Read More

Scott Neely

President, Multifamily Associates, Inc.