Expertise
- Property Investment
- Property deal sourcing
- Property refurbishment
- Property Acquisition Finance
- Property Investment Finance
Summary
John has been in the construction industry for over 40 years, providing leadership across high end London projects refurbishments and new construction guiding the assessment, improvement and long-term stewardship of each development or property.
A qualified Senior Project Manager with a proven track record, he ensures consistent standards and a disciplined, forward-looking approach across all projects he does..
Experience
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Jam property management group Limited
Co founder
1 - 5 Employees 2025 - 2026
JAM Property was co-founded by John Warren and Mary O'Sullivan, combining decades of expertise across property investment, development, construction, sales, and marketing. Together, they have created a company capable of operating across the full spectrum of property investment strategies, providing comprehensive solutions for homeowners, investors, and property developers alike.
Whether clients are seeking to acquire a property, identify investment opportunities, or participate in development projects offering attractive financial returns, JAM Property delivers a bespoke service tailored to individual objectives and requirements.
Mary brings extensive experience gained from senior leadership roles within some of the UK's largest new-build developers, where she excelled as a Sales and Marketing Director. Her deep understanding of the residential property market, customer engagement, and strategic sales provides invaluable insight into identifying and maximising property opportunities.
John complements this expertise with a distinguished background in high-end construction and property development. Having held positions as a Director, Consultant, and Senior Project Manager on a wide range of prestigious projects, he possesses extensive knowledge of construction, refurbishment, project delivery, and asset enhancement.
By combining their respective strengths, John and Mary have established JAM Property as a trusted, one-stop property solutions provider. Their shared commitment to quality, professionalism, and client success enables them to deliver exceptional property sourcing, investment, refurbishment, and development services from inception through to completion.
