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Sherry Costello

Sherry is passionate about real estate and her clients, and her love for her profession is evident when you speak with her. She’s highly driven to professional excellence; deeply committed to her work and to ensuring that every client receives exceptional service. Her extensive experience and market knowledge have equipped her with the skills to be a successful real estate agent. Her authenticity and honesty have earned her a well-regarded reputation which has contributed to her consistent success.

I’m so proud to be recognized as one of the 2026 Top 200 Realtors on the South Shore! A huge thank you to South Shore Real Producers for this honor!

As always, I am grateful for my awesome clients, colleagues, family and friends for their continued confidence and support – you are the best.

Here’s to following your heart and doing what you love… it makes a difference!

Looking forward to an amazing 2026!

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What Our Clients Say

“Sherry is a dedicated real estate professional. We worked together for over a year to find my new home in Marshfield. She worked tirelessly during this time to show me numerous houses and condos in the area before we landed my dream location. Once I found this home, I had a tremendous experience working with Sherry on the sale of my existing house in Marshfield. Sherry had great ideas how to position my home to showcase the value it contained. The closings for both homes went seamless due to Sherry's extensive knowledge of the process and documentation required. I could not be happier! I trust Sherry and would wholeheartedly recommend her to anyone looking to sell or buy a home.”

“Sherry is fantastic! She knows the market, and is very genuine. I listed with Sherry to sell my parents’ home at a very difficult personal time and a tough time of year. She guided me through the process with ease and gave me confidence. She’s a good listener and gently advises / directs when appropriate. Sherry “made it happen” very quickly, handled some surprises and a tight closing schedule without missing a beat. It could not have been any easier. Sherry is a 5-star realtor and lovely person!”

“I was thinking of selling our house. We had a Realtor, but we needed someone who knew the local market. I looked around and did my research and all roads lead to Sherry. I selected Sherry and never looked back. She did all the leg work. She listened, advised and was dogged in her pursuit to landing us the best offer and terms. Boy did she come through. Simply the best. We now have more than a business relationship we are now friends. I highly recommend Sherry if you are buying or selling, we used for her both. Honest, thorough and hard working.”

“Sherry is amazing! Extremely detail oriented, organized, honest and easy to talk to. She stuck with us even though we were extremely picky during a terrible market. We highly recommend working with Sherry. Thank you!!!”

“Sherry Costello was our Realtor for our house up in Marshfield, MA, this was our 4th home we have sold and she was by far the best agent we ever have had. She was a true professional and adjusted very well with some unforeseen circumstances Kept us updated with all the information and kept in communication with the other agent. We never would have felt more comfortable with anyone else during the situation, she really put us as ease. We would definitely recommend Sherry to anyone looking for a Realtor a true professional!”

“I had a fantastic experience working with Sherry Costello as my real estate broker for selling my home. She was professional, knowledgeable, and dedicated throughout the entire process. Sherry went above and beyond to market my property effectively and negotiate a great deal for me. She was always available to answer any questions and provide guidance, making the selling process as smooth as possible. I would highly recommend Sherry Costello to anyone looking to sell their home.”

“My wife and I used Sherry within the last several months to sell our existing house on the South Shore, and to buy a new house. Both the sale and purchase were challenging situations, and we could not have been happier with Sherry. She is knowledgeable and experienced; transparent and reliable; provides solid advice re pricing and creative options in negotiating; is calm under pressure; and is easy to work with. As an unexpected bonus, Sherry has network of people on the South Shore that we drew on for help: lawyers, house inspectors, movers, etc.; without exception, they were experienced, reliable, and priced fairly. Sherry has our highest recommendation!”

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Why Work with Sherry

Sherry has been in various sales positions since 1987; Administrative Search Representative, Sales Coordinator, and Realtor. During her 13 years in real estate, she has benefitted from extensive professional development and training, keeping up with current trends, and continually expanding her knowledge base. She is extremely passionate and serious about her work, and she is strongly committed to her clients. Her determination is described as “professionally tenacious.” Selling homes is not just a business transaction; most often, there is an emotional component to the process. She can approach this piece pragmatically and effectively balance it with the business side of the transaction. Her clients know that she is watching out for their best interests and that her goal is a successful outcome, whether it is the sale of a current home or the purchase of a new home.