About us

Qualifications / Accreditations

• C.Eng- Chartered Engineer (CIBSE)
• BEng (Hons) Building Services Engineering 
• Member of The Chartered Institution of Building Services Engineers (MCIBSE)
• Registrant of the Engineering Council
• Diploma in Industrial Studies

James Porter is the Managing Director of Delta Green Environmental Design and a Chartered Mechanical Engineer with over 25 years’ experience in the design and delivery of building services engineering. He has established a strong reputation for leading the delivery of high-quality, low-carbon solutions across a wide range of sectors, combining technical expertise with a clear strategic vision for the built environment.

James’ experience spans the full project lifecycle, from early-stage feasibility and concept development through to detailed design and construction. He brings a pragmatic, design-led approach to mechanical engineering, with a particular focus on energy efficiency, system optimisation, and the integration of sustainable technologies. His work is defined by a deep understanding of both technical performance and the commercial drivers that shape successful project outcomes.

As Managing Director, James is responsible for setting the strategic direction of the business, while maintaining an active role in project delivery and client engagement. He works closely with clients and design teams to develop tailored, deliverable solutions that align with low-carbon objectives and long-term asset performance. Under his leadership, Delta Green has built a reputation for technical excellence, reliability, and a collaborative approach to engineering.

James combines strong leadership with hands-on technical insight, fostering a culture of accountability, continuous improvement, and high-quality delivery across the team. His commitment to thoughtful engineering and sustainable design underpins Delta Green’s approach to supporting the transition to a low-carbon built environment.

Qualifications / Accreditations

• Chartered Engineer (CEng)
• MEng (Hons) Electrical and Electronic Engineering
• Member of CIBSE (MCIBSE)
• MIET Member of the Institution of Engineering Technology
• Excellence Within Industry- Design, Construction and Asset Management
• IOSH Managing Safety

Jack Price is an experienced building services engineer and has held a long-standing role within the practice since joining in 2015. He specialises in electrical building services design, leading the development of efficient, resilient, and low-carbon electrical systems across a wide range of projects. His expertise includes power distribution, lighting design, and the integration of smart, energy-efficient technologies to support high-performing buildings.

Jack’s work spans multiple sectors, supporting projects from early feasibility through to detailed design and construction. He combines a strong technical understanding of electrical systems with a pragmatic, delivery-focused approach, ensuring that solutions are robust, coordinated, and aligned with client objectives and sustainability targets.

In his role as Associate Director, Jack oversees the engineering team and plays a key part in developing and mentoring colleagues, fostering a culture of technical excellence and continuous improvement. He is responsible for the quality of project deliverables, ensuring that all outputs meet Delta Green’s high standards for performance, coordination, and buildability. Working closely with clients and multidisciplinary teams, he provides clear technical leadership and maintains a strong focus on delivering well-considered, high-quality engineering solutions.

With a collaborative mindset and a commitment to excellence, Jack contributes to the delivery of integrated building services strategies that prioritise efficiency, resilience, and long-term value. His work reflects Delta Green’s focus on thoughtful engineering and practical solutions to support the transition to a low-carbon built environment.

Qualifications/Accreditations:

• MEng Engineering Science
• Certified Passive House Designer

Inge Oosthuizen is an experienced sustainability and building services professional with a strong track record in low-carbon design and environmental analysis across the built environment. With over a decade of industry experience, she has developed deep expertise spanning building services engineering, energy modelling, and sustainability consultancy. Her career includes key roles at Scotch Partners, where she progressed from Building Services Engineer to Lead Energy Consultant, and at Hoare Lea, where she operated at Senior Associate level, contributing to the delivery of complex, high-performing building projects.
Inge’s work is characterised by a rigorous, analytical approach to building performance, combining technical design knowledge with advanced modelling and a clear understanding of how buildings operate in practice. She has extensive experience advising on strategies to reduce both operational and embodied carbon, supporting clients in delivering sustainable, future-ready developments. Known for her collaborative approach and sound engineering judgement, she works closely with multidisciplinary teams to translate sustainability objectives into practical, deliverable solutions aligned with both environmental and commercial priorities.
As Associate Director and Building Physics Lead at Delta Green Environmental Design, Inge is responsible for leading the delivery of building performance analysis across the practice. She oversees the development and application of advanced modelling techniques, ensuring that design decisions are informed by robust data and evidence. Inge plays a key role in shaping project strategies, guiding teams and clients towards optimised, high-performing outcomes, and maintaining the highest standards of technical quality in the delivery of building physics and sustainability services.

Qualifications / Accreditations 

• MEng Mechanical Engineering

Charlie first joined Delta Green in 2015 and is an experienced building services engineer with a strong focus on sustainable design and the delivery of low-carbon solutions within the built environment. At Delta Green Environmental Design, he contributes to the development of mechanical and electrical engineering strategies that balance technical performance with environmental responsibility, supporting projects across a diverse range of sectors. His work spans commercial, residential, healthcare, and leisure developments, with involvement from early feasibility through to detailed design and construction.

His approach is practical and design-led, underpinned by a strong understanding of building physics and system performance. In addition to design work, Charlie undertakes condition surveys, lifecycle assessments, and technical reporting, helping clients understand the current performance and future requirements of existing building assets. He works collaboratively within multidisciplinary teams to develop solutions that are efficient, robust, and aligned with wider sustainability objectives. Combining technical capability with a proactive and detail-oriented mindset, Charlie plays a key role in translating project requirements into deliverable, high-performing engineering solutions.

Qualifications/Accreditations:

• PGDipSurv Building Surveying
• BSc Interior Design
• BREEAM UK Non-Domestic New Construction (NC) Assessor
• BREEAM UK Refurbishment and Fit-Out (RFO) Assessor
• BREEAM UK New Construction (NC) Residential Assessor
• BREEAM Advisory Professional (AP)

Lisa is a highly experienced sustainability professional with over 20 years in the industry, specialising in environmental assessment and building performance, with particular expertise in BREEAM delivery. Her career spans the construction and property sector, including a significant tenure at AES Sustainability Consultants, where she progressed through senior roles to Associate Director. During this time, she led BREEAM services and supported clients across the full development lifecycle, from early-stage planning through to post-construction certification.

Lisa engages regularly with the Building Research Establishment (BRE), contributing to discussions on the evolution of BREEAM, and is passionate about developing future talent, having previously been a guest lecturer at the University of Brighton.

As Associate Director and BREEAM Lead at Delta Green Environmental Design, Lisa brings a pragmatic and commercially focused approach to sustainability consultancy. Her experience spans environmental compliance, energy assessment, and integrated design strategies, enabling clients to achieve robust, measurable outcomes aligned with low-carbon objectives. With a background in interior design and surveying, alongside professional accreditations including BREEAM Assessor and Accredited Professional, she combines technical expertise with a strong understanding of design and delivery.

Lisa works collaboratively with project teams to realise sustainability aspirations, with a particular focus on BREEAM. She is known for her proactive and solutions-driven approach, fostering strong working relationships and consistently delivering high-quality outcomes.