Marsha DeCosta

Marsha DeCosta is a top-producing Realtor® and lifelong resident of the Boothbay and Wiscasset regions. Since joining Tim Dunham Realty in 2017, she has built her business on the core values of trust, loyalty, and integrity principles that have earned her a sterling reputation across Midcoast Maine.

Over the past several years, Marsha has helped hundreds of families buy or sell their homes, with total career sales exceeding $83 million. Her commitment to exceptional service is reflected in her 150+ five-star reviews, highlighting her attention to detail, strong communication, and genuine care for every client she serves.

Marsha’s professionalism and dedication have earned her multiple honors, including the 2021 President's Award from Tim Dunham Realty and recognition as the 2024 Lincoln County Council REALTOR® of the Year. She has proudly served her profession as Treasurer/Secretary for both the Lincoln County Council and the Mountains to Shore Board of Realtors (MSBOR), and as a Director for the Maine Association of Realtors (MAR). In addition, she holds the prestigious Accredited Buyer's Representative (ABR®) designation.

With a trusted network of experts—photographers, stagers, lenders, inspectors, and title professionals—Marsha ensures that every transaction is handled with precision and care from start to finish.

Whether you’re buying your first home, searching for a coastal retreat, or ready to list your property, Marsha DeCosta is a knowledgeable, dedicated, and highly respected Realtor® who makes every client’s real estate experience seamless and rewarding.