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WHO WE ARE
A DESIGN AGENCY.
The dynamic team at Cullinan Design Group combines creativity with expertise to reimagine outdoor spaces. We bring a wealth of knowledge in landscape design, translating your ideas into lush, vibrant environments.

OUR VISION
We believe that your yard should be a masterpiece. We are here to fill in the missing piece of your outdoor puzzle with exceptional communication, transparency, and excellence.
Whether you're starting with an empty space or envisioning a beautiful design, we ensure your outdoor area becomes a cherished part of your life.
MEET THE EXPERTS

Diego Pinon
LANDSCAPE DESIGNER / FOUNDER
As a Landscape Designer specializing in 3D design, I’m passionate about turning my clients' dreams into reality. Growing up on the west side of Downtown Denver, Colorado, I developed a deep love for the outdoors and a strong connection to nature. My journey into landscaping began in the field as a laborer, where I gained hands-on experience and a unique perspective on what makes a yard truly special.
Over time, I noticed a significant gap between clients' desires for stunning outdoor spaces and the lack of design guidance that could bring those visions to life. This realization inspired me to shift my focus from labor to landscape design, with the goal of helping homeowners transform their exteriors into personal, functional, and beautiful environments.
I believe every outdoor space has the potential to reflect the personality of its owner, and I’m dedicated to infusing each design with character, style, and thoughtful planning. With my expertise in 3D design, I work closely with clients to create visually dynamic landscapes that feel as good as they look, bringing each vision to life in vivid detail.
Whether it's designing a serene garden retreat, a modern outdoor entertainment area, or a welcoming front yard, my goal is to craft spaces that feel like an extension of the home itself—both unique and inviting. Let’s create the outdoor space of your dreams, together.

Marcos Gracia
LANDSCAPE DESIGNER / CO- FOUNDER
Hey, I’m a 22-year-old 2D/3D landscape designer, born and raised in Colorado. Being surrounded by nature most of my life really shaped the way I see outdoor spaces — not just as something nice to look at, but as places where people make memories, unwind, and spend time with the people they love.
It all started with a simple curiosity. I’ve always been drawn to design, but over time, I found a real passion in taking empty yards or forgotten corners of a property and turning them into something meaningful. I love the challenge of taking a blank space and imagining what it could be — whether that’s a cozy fire pit area, a modern patio, or a peaceful garden retreat.
Now I use 2D and 3D design tools to help bring those ideas to life, giving people a clear vision of their space before the work even begins. It’s not just about making things look good — it’s about creating something that fits how a family actually lives and uses their space every day.
I take a lot of pride in my work and in the relationships I build with clients. I care about the details, about doing things right, and about creating spaces that last. At the end of the day, I just want to help people fall in love with their own outdoor spaces — and I’m grateful I get to do that through design.