Vertical extensions - a sustainable approach to creating additional space
Article posted on: 30 November 2023
We understand the benefits of vertical extensions for all stakeholders, having built our expertise through years of involvement in a wide variety of schemes, from extensions on modern developments, through to refurbishments and the sensitive adaptation of listed buildings. Our team has the knowledge and skills to ensure the successful delivery of this type of project.
A sustainable advantage
Adaptation through vertical extension is a much more environmentally friendly approach to creating additional space when compared to horizontal expansion or constructing new building. It reduces energy, material consumption and waste generation, ultimately improving our environment and contributing to a more sustainable economy.
Extending vertically as a sustainable approach to expanding available areas is often considered advantageous for several reasons:
Land conservation: Vertical expansion allows for increased density without expanding horizontally. This is particularly important in urban areas where land is limited and expensive. By building upwards instead of out, valuable land can be conserved for other purposes such as parks, agriculture, or natural habitats.
Energy efficiency: Taller buildings can benefit from improved energy efficiency. For instance, vertical structures can take advantage of natural lighting and ventilation, reducing the reliance on artificial lighting and climate control systems. This can lead to energy savings and a smaller environmental footprint.
Infrastructure optimization: Vertical expansion often leverages existing infrastructure more efficiently. By building on top of existing structures, such as adding floors to an existing building, developers can minimize the need for new roads, utilities, and other infrastructure required for horizontal expansion.
Transportation and commuting: Vertical expansion can contribute to more sustainable transportation practices. By creating more compact urban environments, people may have shorter commutes and be more inclined to use public transportation, walk, or cycle, reducing the overall environmental impact associated with long-distance commuting.
Preservation of green spaces: Building upward can help preserve green spaces and natural ecosystems. Instead of encroaching on undeveloped land, vertical expansion allows for the conservation of green areas, promoting biodiversity and maintaining ecological balance.
Economic efficiency: In many cases, vertical expansion can be more economically viable than acquiring new land. Building vertically often requires less upfront investment in land acquisition and infrastructure development than expanding horizontally, making it a cost-effective solution.
Adaptability and flexibility: Vertical structures are often more adaptable to changing needs over time. They can be repurposed or renovated more easily than sprawling horizontal developments, which may encounter greater challenges in adaptation.
One of our latest schemes involving a vertical extension is Tempo in Maidenhead, which is transforming an existing commercial building into sustainable new office accommodation. We’re providing civil and structural engineering services for Legal & General for this £39m Category A office fit-out development. The four-storey building will see a new entrance lobby with a two-storey extension and three rooftop pavilions and terraces.
Recent changes to permitted development rights mean that many existing buildings may now be extended by up to two storeys without requiring a formal planning application. This applies to a range of building types, from city centre commercial schemes to residential blocks and more traditional domestic properties.
Structural engineering challenges associated with vertical extensions
From a structural engineering perspective, there are a number of challenges to overcome when assessing a vertical extension to an existing building, including:
Record information
Building codes and regulations
Budget and time constraints
Structural analysis
Foundation and footing design
Structural compatibility
Connection details
Coordination with all stakeholders
Disruption to occupied spaces
Our team provides solutions to these challenges by collaborating closely with the client and wider design team to provide cost-effective solutions, whilst meeting a project’s objectives. From inception, we review existing information about the structure to advise on the maximum feasible additional storeys and whether structural intervention to strengthen the existing foundations is required. Our focus includes meeting all necessary standards and ensuring health and safety compliance for a structurally sound and purpose-fit building.
It's important to note that the sustainability of vertical expansion depends on various factors, including the design, construction methods, and energy sources used. Additionally, local regulations, community acceptance, and the availability of resources also play crucial roles in determining the overall sustainability of vertical development.
Satpal Sagoo, Clancy Divisional Director, has produced a CPD presentation covering this topic, in particular, the challenges from a structural engineering perspective. If you would like to arrange more information from Satpal about this, please get in touch here.