The Department for Education (DfE) is transforming the future of educational facilities with its newly updated design standards (CF25). A notable example of this evolution is Little Reddings Primary School, where Streif’s advanced timber framework helped deliver a forward‑thinking facility in strict alignment with the DfE’s rigorous sustainability and design standards. Built under the 2021 Construction Framework (CF21), this project embodies a holistic approach to eco-conscious education architecture, prioritising healthy indoor environments, embracing nature-based solutions, and driving down emissions to achieve true net-zero.
While CF21 established the baseline for net-zero carbon in operation, CF25 significantly raises the bar. It expands focus to the building’s total lifecycle, introducing strict embodied carbon caps targeting manufacturing, transport, and construction pollution, while mandating advanced data management to definitively prove environmental performance.
Meeting and exceeding these evolving standards requires continuous industry improvement. Delivering sustainable schools relies heavily on using “lessons learned” and performance data from successful projects to shape updated best practices.
Little Reddings as a leading industry example
Cited by the DfE as a “compelling case study” for demonstrating exceptional net-zero performance in real-world use, Little Reddings Primary School stands as a leading example within the education construction industry.
Data gathered one year post-completion highlights its high performance, with the school operating at an energy consumption rate of just 41.44 kilowatt-hours per square metre (kWh/m2), well below the rigorous 48.56 target set for the project. Furthermore, the total embodied carbon in the school’s construction was extremely low, coming in at just 585.4kg of CO² per square metre against a strict Royal Institute of British Architects (RIBA) target of 1,000kg.
The power of offsite timber manufacturing
How was the exceptional performance at Little Reddings achieved? As Morgan Sindall’s chosen partner for prefabricated components, Streif proudly delivered an integral timber frame solution, collaborating with the wider project team to support the project’s sustainability efforts in line with DfE framework objectives. We provided the fabric-first, closed-panel timber frame system that formed the building’s core structure. Our precision‑engineered timber solution aligned seamlessly with the DfE’s focus on low‑carbon construction and use of modern methods of construction (MMC), demonstrating how high‑performance design and sustainability can work hand in hand.
Opting for our offsite-manufactured system offered several key benefits that reflect the DfE’s ideal construction model:
Sustainable material
Utilising precision-engineered timber as our primary construction material means we are building with naturally renewable and recycled resources. This conscious choice allows us to strictly minimise reliance on non-renewable, carbon-hungry components like steel and cement.
Low embodied carbon
The DfE strongly encourages delivery partners to carefully monitor and cap embodied carbon. To track this, the main contractor Morgan Sindall utilised their CarboniCa system, a digital carbon assessment tool that measures emissions across a building’s design, construction and entire lifecycle to provide stakeholders with a granular understanding of the project’s footprint. Impressively, the resulting report revealed that thanks to the highly efficient nature of our system, Streif’s structural frame contributed just 7.3% to the building’s total lifecycle embodied carbon. As shown in the dashboard below, the timber system also acts as a massive biogenic carbon sink, actively storing 333 tonnes. This minimal contribution was a major factor in driving the overall project’s embodied carbon down to nearly half of the allowance specified by RIBA, underscoring how early design choices materially dictate whole‑life performance.
Exceptional air tightness performance
Following completion, the building significantly exceeded its target air permeability rate, achieving an impressive 2.38 m³/h·m² @ 50Pa. This strong performance highlights the structural and thermal benefits of Streif’s timber solution, demonstrating that a precision‑engineered building envelope is vital for eliminating heat loss and maximising long‑term operational efficiency.
Streamlined assembly and minimal disturbance
Because Little Reddings remained operational during the build, tight control over onsite activity was essential. Offsite manufacturing meant that wall panels and heavy-duty floor cassettes were packaged and transported in a specific order, arriving on site pre-organised for assembly. This highly streamlined process made construction as simple as possible, minimised noisy onsite work to reduce disturbances for students and local residents, and successfully minimised carbon emissions from delivery vehicles during construction.
Leading the way in evolving education frameworks
Ultimately, delivering a net-zero school is about more than just meeting framework criteria and carbon quotas; it is about creating high-quality environments where children can thrive. As Josh MacAlister, Minister for Children and Families, noted regarding the opening of Little Reddings, these projects provide pupils with spaces that are “not only fit for the future, but somewhere that they can feel proud of and want to learn in every day”.
Achieving this level of success requires deep collaboration, open communication, and a commitment to shared environmental objectives across the entire supply chain. As a UK market leader in offsite timber construction, Streif is proud to partner with forward-thinking contractors and clients to turn these ambitious sustainability targets into reality. By continuing to innovate and supply precision-engineered solutions, we remain committed to building the sustainable, high-performance education facilities of tomorrow.
