The company now consists of five people, with an ambition to increase to 12 by the end of the year.
Neall was previously senior broker and head of desk, managing a team of brokers at London Belgravia Brokers.
She has also arranged insurance for projects including a £50m mixed-use Sheffield residential development, and she has supported a number of prime residential developers, including the Royalton Group.
Jack Bristow, managing director at J3 Advisory, said: “I am thrilled to be working with Daisy again. We agreed when incepting J3 that a core principle exhibited by everyone had to be tenacity and a desire to push the ball forward every day.
“I’ve seen first-hand Daisy’s unwavering desire to make her clients the kings and queens of the work she undertakes, so I could not think of anyone more suited to helping us drive J3 forward.
“We’re bullish about the future of the UK property market, and we will be on hand to protect our clients and help enable their growth by delivering the right insurance advice and funding solutions.”
Johnny Leadsom, director, J3 Advisory, added: “Daisy’s enthusiasm and understanding of our markets and the requirements of experienced developers is invaluable to us, and we are very pleased to welcome her to the leadership team.”
Neall said: “Having worked with J3 founders Jack Bristow, Johnny Leadsom, and James Mole previously, I know we work really well together and I very much look forward to driving the growth of the business at such an exciting time.
“All three founders of J3 are hugely knowledgeable and provide a new, integrated approach to finance and insurance, which is already adding real value to its developer client base.”