The right lawyers, with the right experience, in the right place, at the right cost.

Our Team

At Costigan King we have an exceptional team of talented lawyers across a wide range of practice areas.

All of our professionals share a commitment to practice at the highest standard. Upon each instruction, we create bespoke teams of the very best professionals in the business. With our wealth of experience in the legal industry, we are committed to delivering exceptional legal results, with a flexible, commercial attitude.



  • "Working with Costigan King is an all round seamless process. No action is too small or request too big once their services are engaged. Highly coveted legal expertise with a personal touch. They have been integral to getting our business off the ground, I look forward to working with them in the future."

     Darren Michael, Founder, Renewable Infrastructure Network 

  • Julian Critchlow "has vast experience in construction matters and is excellent at quickly getting to the crux of the issue and identifying the most appropriate way forward."

    Chambers and Partners 2021

  • Julian Critchlow "has phenomenal experience and looks at things from a client's perspective in a very commercial way."

    Chambers and Partners 2021

  • "Costigan King is our key port of call for construction matters. Carl Asser's exceptionally client-friendly approach always strikes the right balance of commercial and legal advice in a way that the business needs and loves. Carl is a trusted expert who understands the needs of the business, cutting through complex legal matters to deliver pragmatic advice in an intelligent and efficient way." 

    Charmaine Gragasin, Toyota Plc

  • "Arianne has been our lawyer since the beginning and is excellent, I can't speak highly enough."

    Two Up Digital

  • "Arianne & her team handled the sale of our European marketing business to a large US firm. The sale, & subsequent 3-year earn-out, went smoothly thanks in large part to the excellent job they did in protecting our interests & diligently & efficiently handling all legal aspects of...

     Mike King, Eleven Hundred Agency

  • ...the transaction. Selling a business is never easy, due diligence, countless warrants and long, detailed contracts make the process time consuming and complex. In our case, I’m certain that having the right solicitors on our side made the difference between success and failure."

    Mike King, Eleven Hundred Agency

  • "In a world where law language is the opposite of tech language, Costigan King always make time to break down the complexities and help us understand the detail. Friendly, approachable and efficient."

    Rob Morris, Director, Two Up Agency 

  • "Excellent lawyer." Carl Asser advises on a broad range of non-contentious construction matters relating to infrastructure and commercial development projects. He has recently been sought out to advise on matters relating to London’s high-end residential market as well as on projects involving luxury hotels and department stores. 

    Chambers and Partners 2019