Our People.
Our team has several years of experience within the land and planning industry, making us ideal partners to offer advice on land promotion, the planning process and development.
Joshua Sinnett
Managing Director
Josh joined Rainier Developments in 2017 from Gallagher Estates, where he worked as Land Director with a primary focus on strategic land.
He has an extensive track record at delivering sites suitable for development throughout the UK and prides himself on working closely with landowners, their advisers and key stakeholders to obtain the best possible planning consent for all involved.
During his spare time, Josh enjoys playing a range of sport (especially tennis) and is a life long suffering supporter of Aston Villa football club.
Gavin Gallagher
Planning Director
Gavin has been working in Planning and Development since the year 2000. He is fully conversant with all aspects of the Planning process, including land promotion, planning applications and appeals. He is also a member of the Royal Town Planning Institute (RTPI).
Having started his career as a Planning Officer at Stratford on Avon District Council, Gavin moved into consultancy in 2004 working at Derek Horne and Associates based in London before moving back to the midlands to work at Barton Willmore. Gavin has been working at Rainier since 2017.
When not at work Gavin enjoys taking his son to play football.
Grant Stevenson
Planning Director
Grant has over 25 years’ experience in planning and development, advising on all aspects of the planning process. He has extensive expertise in leading large, multi-disciplinary teams to secure timely and cost-effective planning permissions across a wide range of development projects.
Grant began his career at Birmingham City Council before moving to Barton Willmore, where he advised a broad range of housebuilder and developer clients. During this period, he was involved in several high-profile schemes across the Midlands, including one of the Government’s shortlisted eco-town proposals. Prior to joining Rainier Developments, he spent four years at Catesby Estates identifying new development opportunities and managing strategic land projects throughout the UK.
Grant is a member of the Royal Town Planning Institute (RTPI).
Jo Kirk
Group Finance Director
Jo qualified as an accountant at an earlier age than is typical, due to deciding not to go to university after A Levels and going straight into the industry to gain experience and study around a full-time job. This method of study was repeated with the ICSA qualification and a MBA from Warwick Business School.
Jo has been involved in a variety of sectors, managing and leading finance functions, but more notably within property investment and development since 2005, ensuring as part of her finance leadership role that the operational function was aligned to the strategic goals. Within her current role she is responsible for developing the finance function to meet the strategic requirements of the company.
In her spare time, Jo can be found running, swimming or undertaking random DIY tasks.
David Harper
Land Director
David has over 25 years of experience in the property and development sector, having previously held the role of Land Director at Catesby Estates before joining Rainier Developments Ltd.
He brings extensive expertise gained from working with both national housebuilders and land promotion companies where he has gained a detailed knowledge of promotion agreements, option agreements, and development infrastructure. Throughout his career, he has built a strong track record in identifying opportunities, creating value, and delivering successful land strategies across a wide range of residential and mixed-use projects.
David’s specialist areas include strategic land identification, land acquisition and subsequent disposal of future land opportunities throughout the UK. He prides himself on working closely with landowners, developers, and professional advisors to unlock the full potential of sites, navigate complex transactions, and achieve commercially successful outcomes.
With a practical, results-driven approach and deep market knowledge, he is committed to delivering opportunities that support sustainable growth and long-term value.
Emma Cancho-Marchena
Office Manager
Emma is a key member of the team, bringing 24 years of experience as an Office Manager at Barclays Corporate Finance. She is known for keeping everything running smoothly, staying on top of every detail, and providing reliable support across the business.
Married with three children, Emma enjoys travelling, cooking, and staying active at the gym. Friendly, organised, and dependable, she brings a positive, down-to-earth approach to both her work and home life.