Jason  Green

Jason Green  

Senior Partner | Guernsey

Real Estate

  • Jason is always available and he provides excellent advice.
    Chambers UK 2024
  • Paul is a speedy responder who gives sensible, pragmatic advice.
    Chambers UK 2024
  • Jason Green is good to work with, professional, responsive and pragmatic, which is important.
    Legal 500 (UK) 2023
  • Well connected to the marketplace, regularly hosting focus groups that encourage debate among the attendees not only on market conditions but also issues and concerns affecting the sector. Help shape the industry through thought leadership.
    Legal 500 2025 (UK)
  • 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
  • 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 provides excellent advice for board consideration.
    Legal 500 2024
  • Paul's passion for getting things right is very impressive, yet he is very commercial and likes to cut through complexity to deliver sensible solutions.
    Chambers UK 2024
  • Extremely knowledgeable and fills you with confidence
    Client feedback
  • Jason is experienced and knowledgeable.
    Chambers UK 2024
  • Articulate and knowledgeable, he is client-focused and goes the 'extra mile' to ensure satisfaction
    Client feedback
  • Helpful, active, intelligent and approachable
    Client feedback
  • Jason's responsiveness and advice are top notch.
    Chambers UK 2023
  • 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
  • We particularly enjoy working with Jason Green. We find him responsive, diligent, commercially minded and a good team player.
    Legal 500 2022


Jason is the Senior Partner of Collas Crill, and global head of the firm's Real Estate 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 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.

He was sworn in as a Lieutenant Bailiff of the Royal Court of Guernsey and Deputy Judge of the Magistrate's Court of Guernsey in 2023.


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 2024
  • Band 1 in the Chambers UK Guide 2024


*Business Assistant
Lisa  Paul

Lisa Paul

My services
Guernsey real estate

Whatever your property goals, you want personalised advice that is right for you.

We take the time to get to know you and offer discreet, practical advice that’s tailored to your needs. Our friendly, experienced team is one of the largest on the island and can help you with a range of property services, whether you're relocating to the Channel Islands, moving house on island, planning to develop your property or seeking other residential or commercial property advice.

Read more
Personal relocation

When considering a move offshore, it's essential to seek advice from experienced advisers who know the market inside out. Our property teams regularly help newcomers to the Cayman Islands, Guernsey and Jersey in acquiring new homes and/or business premises and guiding them through the relocation process. We act for many high-net-worth individuals and high-value residents.

Read more
Third sector - charities and NPOs

The third sector is an umbrella term that covers a variety of different organisations with different legal structures and purposes, belonging neither to the public sector (the state) nor to the private sector (profit-making private enterprise).

As a business, we are heavily focused on supporting third sector organisations both in our local communities on local issues and also internationally.

Charities, non-profit organisations (NPOs) and voluntary organisations are increasingly required to plug the gap and perform the social and cultural functions formerly carried out by the public sector.

Read more
Wills and estates

Managing wealth, asset preservation, planning for succession and inheritance, and writing wills can be a complex and difficult experience. It's important to ensure that your assets are distributed according to your wishes and that your family and/or successors are taken care of.

Read more
Commercial real estate

Our commercial property team includes some of the most highly regarded offshore commercial property lawyers. We are recognised and cited for our experience, commercial approach, exceptional service standards and 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.

Residential real estate

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.

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 recognised businesses.

Construction and development

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, though to estate schedule drafting and eventual sales. Our team also regularly advises on construction law documents and contracts.

16 May 2024

Collas Crill's hampers bring back memories for islanders on Liberation Day

Collas Crill was very proud to support the Liberation Day hampers once again this year, along with the Guernsey Dairy, Guernsey Hamper Company and States of Guernsey's Committee for Education, Sport and Culture. A team of Collas Crill volunteers spent a ...

26 Apr 2024

GDA's plans for Guernsey shared at latest Commercial Property Lunch

The Real Estate team in Guernsey was delighted to welcome Simon Kildahl and Peter Watson from the Guernsey Development Agency as guest speakers at its latest Commercial Property Lunch on 24 April. Taking place on a quarterly basis, these lunches provide ...

4 Apr 2024

Collas Crill once again keeps the spirit of Liberation Day alive in Guernsey

PLEASE NOTE THAT ALL 500 HAMPERS HAVE BEEN ALLOCATED In commemoration of Liberation Day Collas Crill will once again be supporting the States of Guernsey's Committee for Education Sport and Culture in gifting individual hampers to those islanders who rem...

11 Jan 2024

Collas Crill restructures to harness global expertise

Collas Crill has restructured its legal services into four global practices to provide clients with even greater access to the breadth and depth of its expertise across the world. This has led to a number of new leadership roles within the firm: Michael...

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 (IDP). The Call for Sites is an opportunity for residents, landowners, developers a...

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 across its offices in Guernsey, Jersey, Cayman and BVI, and raising its profile acr...

Showing 6 of 98 Results

Load more

Showing 2 of 2 Results