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Jason  Green

Jason Green  

Senior Partner | Guernsey


  • Extremely knowledgeable and fills you with confidence
    Client feedback
  • Jason Green offers both property knowledge and also provides common sense options and alternatives to problems that always arise in complicated transactions - he is also quick to notice where there maybe issues so that parties can discuss and resolve
    Legal 500
  • Jason Green is the partner that we deal with on almost a weekly basis, he has an excellent knowledge of the Guernsey property sector along with a very good commercial understanding of the sector. Collas Crill have an excellent property team.
    Legal 500 (UK) 2023
  • Jason's responsiveness and advice are top notch.
    Chambers UK 2023
  • Jason Green is good to work with, professional, responsive and pragmatic, which is important.
    Legal 500 (UK) 2023
  • Jason is very responsive and understands some of the complex issues that we deal with. All of our property work in Guernsey is undertaken by Jason Green.
    Legal 500 (UK) 2023
  • Helpful, active, intelligent and approachable
    Client feedback
  • We particularly enjoy working with Jason Green. We find him responsive, diligent, commercially minded and a good team player.
    Legal 500 2022
  • Articulate and knowledgeable, he is client-focused and goes the 'extra mile' to ensure satisfaction
    Client feedback


Jason is the Senior Partner of Collas Crill, and a Partner in the Guernsey Property team.

Jason acts for numerous high net-worth individuals with property portfolios as well as banks, companies and other clients with commercial and residential property portfolios. He also acts for high net-worth individuals moving to Guernsey and sits on the Guernsey Property Forum.

The role of Senior Partner encompasses being an ambassador for the Collas Crill group across its offices in Guernsey, Jersey, Cayman and BVI, and raising its profile across the globe. As the most senior figure within the firm, Jason is involved in the strategic direction and decision making of the firm.

"What clients need is timely commercial practical advice which leads them to their target. We are not the passengers, we are the drivers."


Jason has over the years been involved in most of the largest commercial transactions in Guernsey, whether acting for seller, buyer, lender, landlord or tenant and including Royal Chambers, Royal Bank Place, La Grande Mare Hotel, The Guernsey Press, Albert House, Carey House to name but a few.

His clients include The Channel Islands Property Fund, RBSI, Kleinwort Hambros, Guernsey Housing Association and ComProp.

Jason also advises on planning matters and has appeared before the Appeals Tribunal on various occasions advising on some of the most controversial applications.

For for the past few years Jason been heavily involved in the redevelopment of Admiral Park, which has seen the construction of a brand new Premier Inn, a restaurant as well as two flag ship office buildings – Jason having drafted many of the documents required for the construction, agreements for lease, leases and related documents. He also acted for the developer in the recent sale of the smaller office building which is home to Bank Julius Baer. He regularly provides advice to office tenants as well as landlords on their property requirements

Jason is also the Registrar of the Bailiwick of Guernsey Probate Registry and Ecclesiastical Court.

He is a Notary Public and Chair of the Association of Guernsey Notaries Public. Jason is also the Registrar of the Bailiwick of Guernsey Probate Registry and Ecclesiastical Court.


Jason joined Collas Day and Rowland, as it then was, in 1994 and has been integrally involved in the development and growth of the firm over almost three decades. He headed up the property team until December 2020. 

Aside from property, Jason has a passion for Corporate Social Responsibility and has been involved in many charities over the years, most notably being chair of Autism Guernsey from its incorporation until 2018, as well as chair of the Judging Panel of the Community Foundation Awards for Achievement. He is also an ambassador for the Priaulx Premature Baby Foundation and regularly provides legal advice to charities on their property requirements.

Most recently he was the driving force behind Collas Crill's involvement in the Guernsey Liberation Day hamper initiative, a partnership with Education, Sport and Culture (of which Jason is a non-voting member), which saw 500 hampers donated to those islanders who lived through the Occupation or who were evacuated from Guernsey in the Second World War.

Jason was appointed as Senior Partner in June 2023.


  • Leading Individual in the Legal 500 2023
  • Band 1 in the Chambers UK Guide 2022



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Lisa  Paul

Lisa Paul

My services
Commercial Real Estate

At Collas Crill, our commercial property team includes some of the most highly regarded offshore commercial property lawyers. Our team is recognised and cited for its experience, commercial approach, exceptional service standards and its ability to deliver in a fast and efficient manner. Across Guernsey, Jersey and the Cayman Islands we have been involved in many of the most significant commercial property transactions of the last decade. We handle all aspects of commercial freehold and leasehold real estate, acting for both landlord and tenant, buyer and seller. We have the experience to guide you through every stage of a transaction with absolute confidence.


Our team regularly advises on construction law documents and contracts.


We act for a number of well-known and well-respected local development companies and can assist with all aspects of a development project, including site acquisition, finance, planning and constructions advice, all the way though to estate schedule drafting and eventual sales.

Leisure and Retail

We have acted for numerous business owners, developers and investors in the leisure and retail market, including freehold acquisitions and disposals, financing and leasehold and commercial aspects. We regularly act for many funds, hoteliers, and retail landlords and tenants, including many nationally and internationally recognized businesses.

Private Client

As global legislation, regulation and taxation constantly change and become more complex, it has never been more important to make long-term plans to secure your future, the future of your family or your business. We cut through the legal jargon to provide clear, practical advice when you most need it and anticipate the challenges you are likely to face so that you can rest assured you and your family are in safe hands at every step of the way.


At Collas Crill we take a hands-on approach, working in close collaboration with our clients, their advisers and other legal professionals to ensure every deal and transaction is managed to successful completion. Regardless of the prevailing economic and market conditions our goal is to minimise the risks and drive maximum value for our clients in every property transaction. Our property specialists have the local knowledge and expertise to not only offer top quality advice on all commercial and residential transactions, but to give meaningful opinions and anticipate challenges and opportunities at every stage of the process.

Property Relocation

When considering moving to the island, it's essential to seek advice from experienced advisers who know the market inside out. Our property teams regularly help newcomers to the islands in acquiring new homes and/or premises for new business and guide them through the relocation process. We believe that communication and responsiveness are the key to a stress-free experience which is why we're always on hand to listen, offer assistance and pick up the phone to keep you informed at every stage of your move. We act for many HNWIs and HVRs and are consistently praised by clients for their calm, proactive and hands-on approach, ensuring all transactions are completed as swiftly and stress-free as possible.

Residential Property

Property law can be a complex, daunting and emotional experience for many individual buyers and sellers. Feeling an emotional tie to your new or prospective property, your 'home', is inevitable. When buying or selling property you need a strong, dependable team that knows the market inside and out. We offer top quality advice and successfully anticipate the unique challenges and opportunities you are likely to face. We believe that communication and responsiveness is the key to a stress-free experience which is why we're always on hand to listen, offer assistance and pick up the phone to keep you informed at every stage of a transaction.

Wills & Estate Planning

Planning for the future is something that people often don't like to think about however it is one of the most important things that you should do during your lifetime. Whether you need simple Wills put in place or more complex estate structuring, our experienced and approachable team can help you organise and plan your affairs for the immediate and longer term future. We work hard to guide you through any issues of concern to ensure that you reach a position where you feel reassured that you are clear as to what will happen to your assets, and the ones you leave behind, in the future.

News 11 Sep 2023

Guernsey's Call for Sites

On Monday September 11, The Guernsey Development & Planning Authority launched a 'Call for Sites' as part of the ongoing focused review of the Island Development Plan...

Life & Careers 30 Jun 2023

New Senior Partner for Collas Crill

The Partners of Collas Crill have elected Jason Green as the firm's Senior Partner. The role of Senior Partner encompasses being an ambassador for the Collas Crill group...

Life & Careers 20 May 2023

Liberation Day hampers a success

Collas Crill was very proud to support the Liberation Day hampers this year, along with the Guernsey Dairy. A team of Collas Crill volunteers spent busy morning handing the...

News 1 Mar 2023

Guernsey Immunity Certificate fee i

Applying for an Immunity Certificate from the States of Guernsey Development & Planning Authority (DPA) is due to become more costly. The application fee (currently £70)...

Insight 23 Jan 2023

Guernsey property market review

The past few years have seen unprecedented activity in the Guernsey property market as easy access to low-interest lending (among other influences) whipped the post-pandemic...

Guide 16 Jan 2023

Collas Crill explains... Vesting and severance

This is part of a series of guides in which we examine areas of Guernsey law that frequently arise in practice. Further guides will be released; click here to subscribe to...

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Event 3 Apr 2019
Past Event

Risk and Regulatory Spring Seminar

Collas Crill is hosting a seminar on Public Law: considerations for business. In an age of increasing legislation, regulation and government decision making that impacts the...

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