About Karen Costello

"I have had the pleasure of having Karen Costello as my Realtor. Karen did an amazing job getting my house sell-ready. As a matter of fact, my house sold on the first day of showings! This home is very special to me as it was my childhood home. Karen made sure every step of the way that it was easy on my heart. Her vibrant personality, professionalism, attention to detail got the job done! Thank you so much Karen & William Raveis Real Estate"!
Michelle Douglas (Weymouth)

"Karen is a wonderful person. When we had Covid, she saved our lives! We were new neighbors in Squantum and we hardly knew her and she was so generous and stopped over daily to check on us. She took care of us without us even asking. She is one of those people that goes above and beyond and puts 100% into everything she does! Her bubbly personality and her thoughtfulness are only a few of the wonderful qualities she possesses. We would strongly recommend working with Karen!"
Lee & Richie McDonald (Squantum)

"Karen helped me in my search and educated me on the current real estate climate and market trends. She aligned my with financial, legal and insurance professionals at Raveis, and followed through even after the closing to make sure my needs were met."
Christian Torres (,)

"Karen is knowledgeable, professional and she was very helpful throughout the sale of our home. She went above and beyond for us...helping us to clear out our home, moving furniture, donating items for us several times, booking a dumpster, etc. etc. <br /> <br />We have worked with Karen now on 4 transactions! <br />Once we had our home under contract, Karen helped us again throughout the process of buying our new home. I would recommend her in a minute! She is thoughtful and a "full-service" Realtor and makes sure her clients are well taken care of!"
Patricia Barrett (Weymouth, MA)

"Our agent, Karen Costello,went above and beyond for us. She guided us through the selling process.She was very helpful in explaining what we needed to do to get the house ready to ready to sell. Karen even helped us get rid of some things. She made the experience less nerve-racking. Thank You!"
Francine Caruso (Quincy, MA)

"- Initiate and sustain contact with seller's agent <br />- Research or find answer to any questions we had about a property <br />- Direct communication between buyers and any other necessary parties <br />- Show up for open houses and showings of properties"
Larry Thomas (Woburn, MA)

"My wife and I had not sold a house since the 1980s. The process has certainly changed. Karen Costello carefully explained all of the nuances that go with selling a house in Massachusetts in 2025. Her knowledge, experience and insight were invaluable!"
David Brink (Barnstable, MA)

"Karen was a fantastic agent to work with! She went above and beyond to make sure I found a home I was truly in love with and stayed with me right through closing. Karen was extremely professional, and you can tell that she puts her heart and soul into this! Would absolutely work with her again in the future!"
Amanda Davis (Sutton, MA)