Skip to main content

Kieran Joseph Costello

Divorce and separation Attorney

4.4   13 reviews
  • Licensed for 31 years
    State CT
    Acquired 1992
    Active Lawyer disciplined by state licensing authority in 2016

About Kieran

Learn Kieran’s areas of practice.


No contact information available for this lawyer


4.4 / 5.0
  13 customer reviews
5 Star
4 Star
3 Star
2 Star
1 Star
Posted by Clark | November 8, 2016
This review is from a person who hired this attorney.
| Hired Attorney
Effective attorney
Attorney Kieran Costello was a on top of my divorce case right from the start. He was diligent in pursuing settlement, but very able in front of judge, which was necessary at several points during the case. I appreciate the time and effort he and his team put into my matter, and was very happy with the results. His office was prompt with billing, so that I was able to understand the progress of my case and could evaluate my options accordingly. Highly recommend.
Read less
Posted by Georgina | October 11, 2016
This review is from a person who hired this attorney.
| Hired Attorney
Attorney Costello and his entire team were amazing to work with. They represented me a year ago in a divorce. Not only where they efficient, but they were also very kind. They shared every step of the process and guided me to a dissolution of my marriage efficiently, professionally and all fees were fair and clear from the beginning.
Read less
Posted by Kate | August 24, 2016
This review is from a person who hired this attorney.
| Hired Attorney
Excellent Attorney
I was referred to Attorney Costello last year from a friend for child support and custody issues. Attorney Costello was very knowledgeable and compassionate. He kept me informed me on every issue and made me feel safe to put my child's future in his hands. I would highly recommend him.
Posted by Roger L. | August 19, 2014
Responsive and Thorough
I worked with Kieran and his staff for nearly two years on a very contentious and complicated matrimonial matter. The case ended up going to trial where Kieran argued zealously on my behalf. I was impressed by the way in which he and his staff were responsive to my inquiries. I was also pleased by the thorough manner I was prepared and he was prepared for the trial. The outcome after the trial was very favorable. I interviewed several other attorneys and was happy that I chose Kieran to ultimately represent me.
Read less
Posted by Linda | September 27, 2013
Many thanks for your efforts!!!
I hired Attorney Costello to represent me in a divorce case. I had been represented by other attorneys on this case over the course of the last year. He was the first attorney to clearly communicate what he was doing for me and my children in my case. He was able to help me finish the case and get my Ex to stop harassing. He gave me a voice when I felt that no one was listening to me. I am so glad a friend recommended him to me. Thank you Mr. Costello! I will never forget what you did for me!!----- Linda
Read less
Posted by anonymous | February 10, 2012
Great Appreciation
I hired Attorney Costello and his team at Costello and McCormack, P.C. to help me through my divorce, he kept his promise by fixing my problems and getting me the financial support and property that I deserved from my marriage. I am 100% satisfied with the result of my case. Attorney Costello and his associates kept me informed through every step of the divorce proceeding and returned all my phone calls and emials the very same day. They ensured that I was happy with every decision along the way and they were always availabe when I needed to talk. In my opinion, Attorney Costello's billing was very fair and his advice and the ultimate outcome of my case was well worth the money spent. If you want good quality work done, you have to expect a price that will match the work and I definitely received the service I paid for. He is a smart, strong advocate and is also a very compassionate person. In my opinion, He is one of the best attorneys I have ever hired. Highly recommended!
Read less
Posted by Suzanne | December 15, 2011
Divorce Lawyer
I hired Attorney Costello and his firm to represent me in a child support collection case. He was able to secure a substantial payment for me on the back owed child support. I had tried unsuccessfully for years to get regular payments from my former husband. Kieran was the only person who would help me. I really appreciate what he did for me and my kids. I would hire him again in a heartbeat and highly recommend him to my friends and family if they need a lawyer.
Read less
Posted by Mimi O. | December 14, 2011
Thank you!
What I appreciated most about Kieran Costello was that he always returned my phone calls the same day. I came to Attorney Costello after firing my first lawyer in my divorce case because nothing was getting done. That lawyer never returned my calls or emails. It's so important to have someone who will communicate with you throughout the process and address concerns. Going through a divorce, you sometimes don't know what to press and what not to press. Attorney Costello counseled me on what battles are worth fighting and what to let go, and as a result no unnecessary costs were incurred. This divorce was the best Christmas present I ever got! I would highly recommend him for family cases and will definitely return to him for any other legal issues.
Read less
Posted by anonymous | December 7, 2011
Costello and McCormack successfully negotiated a divorce agreement that served both me and my daughter well. I am very grateful for all of their hard work."
Posted by anonymous | December 5, 2011
Gets the job done right!
Attorney Costello and his colleagues effectively worked together to modify my ongoing child custody case against my ex husband. I initially met with Attorney Costello but was pleased to know that everyone in the firm would contribute their knowledge and skill towards my case. You definitely get what you pay for at Costello and McCormack. Attorney Costello was much more knowledgeable about the ins and outs of this type of case especially in comparison to my other attorney based out of Fairfield as well. I highly recommend them to anyone considering they do more than divorces and child custody suits.
Read less
Posted by anonymous | December 2, 2011
Strong representation in my divorce
I had an excellent experience with Kieran Costello and all the attorneys at Costello and McCormack. Attorney Costello was extremely knowledgeable about the divorce process and the way to get the best settlement for my case. I thought I knew about my husbands finances, but Kieran uncovered the truth and I received a favorable divorce settlement. Kieran was the tough attorney I needed for my case. While he was tough arguing my case, he was very compassionate and patient with me - I needed that too. Costello and McCormack's billing was fair and clear.
Read less
Posted by suzanne | September 18, 2016
This review is from a person who hired this attorney.
| Hired Attorney
Seemed caring but steered me the wrong way
I believe on the one hand Kieran means well, that he is a good person at heart. Unfortunately, the facts of his representation of me illustrate the poor footing I had as a start of a long legal battle as Defendant Mother in what should have been a straight forward child custody case. He told me when I interviewed him that my case was simple and straightforward, so that the $2500 retainer I gave him would be all we need to get the basics done. I spent only 3 months with he and his colleague Claire (who was incredibly responsive and caring, smart) and my bill tallied in excess of $25,000. When I disputed the final large bill he sent as I was changing representation, he filed a lawsuit in civil court against me and served me papers. He permitted the counter lawyer on the case (the Plaintiff's lawyer) to dispose me for hours without any trial dates scheduled and only 6 weeks after my c-section giving birth to my son. He was not firm, did not stand up for me in a family relations meeting whereby a visitation schedule for my newborn was put into play that was 50% more time / frequency than was not at all feasible with the estranged, very aggressive and abusive father of my son. From all that I've learned the last 2+ years in the court system, his approach is not one I'd recommend. He was very effective in communicating and winning his/our position to Probate Court on a separate but related matter, and for that I'm very grateful.
Read less
Response from Kieran Costello September 19, 2016
What the reviewer fails to include in her comments is that her matter required many court appearances in three separate court proceedings in three different courts - criminal, family and probate court. When initially retained there was only a family court case for which I was to provide legal representation. Depositions are standard in contested custody matters and was agreed to in writing by the reviewer.. Indeed, the reviewer requested that the deposition be scheduled on a particular date which was convenient to her. I never indicated the total fee to be charged. The reviewer ultimately paid a compromised amount of fees after it was negotiated in a friendly telephone conversation. I know that the reviewer received quality legal representation from me and my office. I am proud of the work we performed and I firmly believe that the reviewer was in a better place after my representation.
Read less
Posted by Laura | September 26, 2013
I hired Kieran to help with a simple modification because my dauther turned 18. He said it could be done for the $2500 I gave him at our first meeting. We had not even gone to court and the bill was an additional $11,000 which he knew I did not have. I fired him. He got a judgement against me and tried to foreclose on my house. After reviewing all his invoices I realized he charged me more per hour than I had agreed to. RUN - RUN fast!
Read less
View less reviews


We have not found any cost information for this lawyer


AVVO RATING 5.4 (Average)

Professional misconduct

This lawyer was disciplined by a state licensing authority in 2016.

Reprimand issued in CT, 2016
updated on 03/06/2017

A reprimand is an order from the Statewide Grievance Committee after it has found that an attorney has engaged in ethical misconduct. If an attorney receives more than 3 reprimands in 5 years, a presentment must be filed against the attorney so the Superior Court can decide if more serious discipline should be ordered.

Attorney endorsements

Received (0)
Given (0)
Endorse Kieran
Endorsements from fellow lawyers are an important consideration for many when selecting the right attorney.
This attorney hasn't created any attorney endorsements recently on Avvo.

Avvo Contributions

This attorney hasn't created any legal answers in Q&A or legal guides recently on Avvo.

No Photo
Kieran Joseph Costello
Divorce and separation Attorney
Licensed for 31 years
This lawyer was disciplined by a state licensing authority in 2016. See details