Service Areas
Brentwood, CACastro Valley, CADiscovery Bay, CADublin, CALivermore, CAPleasanton, CASan Ramon, CASunol, CATracy, CAWalnut Creek, CA
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About Sam Costello
As a dedicated and approachable realtor, I'm passionate about helping people navigate one of life's biggest decisions--buying or selling a home. With a strong background in marketing and a deep understanding of the local market, I bring a strategic yet caring approach to every transaction. I pride myself on being reliable, responsive, and fully invested in my clients' goals, treating each home sale or purchase with the same care and attention I would for my own family. Whether you're upsizing, downsizing, or buying your very first home, I'm here to guide you every step of the way.
Community Involvement
Being involved in the community is something I truly value. From supporting local schools and small businesses to participating in neighborhood events and charitable drives, I love finding ways to give back and stay connected. Whether it's volunteering, organizing giveaways, or simply showing up to support a neighbor, I believe that strong communities are built through kindness, consistency, and genuine care. As a local realtor, I don't just work here--I live here, raise my family here, and am deeply committed to helping our community thrive.
HOBBIES/INTEREST
When I'm not helping clients with real estate, you'll usually find me spending time with my family, enjoying the outdoors, or working out. I love going to the beach, walking our three dogs, and finding new places to explore together. Staying active is important to me, whether it's a good workout session or just being outside in nature. I also enjoy traveling--especially visiting family in England--and making memories through simple moments and traditions. These personal passions keep me grounded and bring balance to my life, which ultimately helps me show up even stronger for my clients.
FAMILY
Family is the heart of everything I do. I'm a proud wife and mom to five incredible kids, and we share our home with three sweet and spirited dogs. Life in our household is full of love, laughter, and nonstop activity--and I wouldn't have it any other way. Whether we're enjoying a beach day, cheering on our kids, or just spending quality time together, family means everything to me. They're my greatest source of inspiration and the reason I approach life and real estate with so much heart and dedication.
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Specialties
- Sellers
- Buyers
- Residential Property
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FAQ
My biggest advice to buyers is to get clear on your goals and stay prepared. In today’s market, being pre-approved by a trusted lender is key—it strengthens your position and helps you move quickly when the right home comes along. Know your must-haves versus your nice-to-haves, and trust the process. Homes can move fast, so working with an agent who understands your needs and can act swiftly is essential. Stay open-minded, ask questions, and don’t be afraid to lean on your agent—that’s what we’re here for! My goal is to make the experience as smooth, informed, and stress-free as possible so you can confidently move into the next chapter of your life.
My top advice for sellers is to focus on preparation and presentation. First impressions matter, so take the time to declutter, deep clean, and make any small updates that can help your home shine—buyers notice the details. Pricing your home correctly from the start is also critical; an overpriced home can sit, while the right price can spark strong interest and even multiple offers. Partnering with a knowledgeable agent (like me!) who knows the local market, uses strategic marketing, and offers honest feedback can make all the difference. You only get one chance to launch your home—let’s make it count.
I’ve had the pleasure of working with a wide range of clients—from first-time homebuyers and growing families to downsizers, investors, and those relocating to or from the area. Each client has their own unique story, and I take pride in tailoring my approach to meet their individual needs and goals. Whether it’s guiding someone through their very first purchase, helping a family find their forever home, or assisting a seller in preparing their property for top dollar, I’m committed to providing a seamless and supportive experience every step of the way.
One of the most rewarding transactions I’ve had was with a pair of first-time homebuyers who truly believed they’d been priced out of the market. They were feeling discouraged and unsure if homeownership would ever become a reality. After listening to their concerns and carefully reviewing their goals, we stayed persistent and strategic. When we found a home they loved, we acted quickly—and despite it being a competitive market, I was able to negotiate the purchase **below list price** and secure **credits toward their closing costs**. Seeing the joy on their faces when they got the keys to their dream home was unforgettable. Moments like that are exactly why I do what I do!
I’ve always had a passion for real estate—there’s just something about homes, design, and helping people find the perfect space that’s always inspired me. I started my career in marketing, which is where I really honed my skills in branding, communication, and connecting with people. Eventually, I began working behind the scenes with realtors, managing their marketing and supporting their day-to-day operations. That experience opened my eyes to how much I truly loved the business—and that’s when I knew I’d found my dream career. Getting my real estate license was the natural next step, and I’ve never looked back. Now I get to combine my creative background with my passion for helping people, and I truly love what I do.
I’m a proud holder of the SRES® (Seniors Real Estate Specialist) designation, which means I’ve completed specialized training to better serve the unique needs of clients aged 50 and over. Whether it's downsizing, relocating, or planning for the next chapter, I understand the financial and emotional considerations that come with these life transitions. My approach is always patient, respectful, and tailored to each client’s pace and priorities. People choose to work with me because I genuinely care—I listen closely, communicate clearly, and go above and beyond to make the process smooth and stress-free. With a strong background in marketing and a passion for building lasting relationships, I’m here to guide you with confidence, compassion, and expertise every step of the way.
