Seamless, Light-Filled Spaces That Transform the Way You Live
At Armstrong Simmonds Architects, we design bespoke rear extensions that enhance the quality of everyday life. Whether you’re seeking an open-plan kitchen, a contemporary family living space, or a better connection to your garden, we create thoughtful architectural solutions that respond to your lifestyle, complement your property, and maximise natural light and flow.

Aside from providing you with a beautiful design, your architect needs to navigate complex
planning and building laws that regulate the construction industry. Therefore, appointing a
practice with the right amount of experience is the key to a smooth project delivery. Although
not essential, appointing a RIBA chartered practice is also an important factor to consider.
Being RIBA Chartered means that the practice must adhere to a code of conduct of
professionalism and ethics which ensure quality control within the Architectural industry. The
experience of the practice within London is another important factor to consider, particularly,
as each borough has different modes of operation which can influence the design process.
Whilst the National Planning Policy Framework (NPPF) provides the backbone for planning
policy, each individual borough will have its own set of policy and guidance. A particular
challenge within the borough of London is the planning process for basement design. For
such a complex undertaking, stringent planning requirements must be met in the form of
traffic reports, geology surveys and more. Another challenge is the added complexity of
working with historic buildings. If your building is within a conservation area, a designated
building of interest, or a listed building, any work to that building or surrounding area will be
subject to strict requirements that are typically more rigorous than standard planning
requirements. London Architects and designers must ensure their clients are advised
appropriately on the process and that suitable consultants are appointed to conduct the
necessary work.
A rear extension is one of the most effective ways to add space and improve functionality particularly in period and terraced homes across London. Extending towards the garden allows for reimagining ground-floor layouts with spacious kitchens, dining zones, or versatile family areas filled with daylight and garden views.
With space at a premium in London, a well-designed rear extension can offer flexibility without the disruption of moving.
From our Battersea studio, we work across the London boroughs, offering a complete architectural service tailored to each project:
We begin by understanding your aims and assessing the site. We explore design options to make the most of available space, natural light, and movement through the home.
Our team prepares the required drawings and submits planning applications on your behalf, liaising with local authorities. Given we were founded in 2010, we have exceptional experience in dealing with planning departments.
We incorporate elements such as bespoke glazing, sliding or folding doors, rooflights, and soft landscaping to create cohesive indoor-outdoor living environments.
We produce comprehensive technical drawings and collaborate with structural consultants to provide a coherent technical design package
Throughout construction, we administer the contract, carry out regular site visits, and oversee project implementation to help deliver the design as intended.


No two extensions are alike. Our portfolio ranges from sleek contemporary additions in glass to more traditional brick-built designs that blend effortlessly with period façades. Across all projects, we focus on:
Whether your aesthetic leans contemporary or classic, we tailor every element to reflect your brief and aspirations.
As a RIBA Chartered Practice with a strong portfolio of residential work, Armstrong Simmonds Architects has an excellent reputation and are well regarded amongst homeowners across London. We bring together creative thinking, technical precision, and deep local knowledge to deliver rear extensions that are as functional as they are enduring.
If you’re thinking about a rear extension in London, we’re here to guide you. Whether you have a vision in mind or are just exploring possibilities, let’s unlock the potential of your home together.

Architect's studio