Double Storey Extension
Through a unique combination of engineering, construction and design disciplines and expertise.
Welcome to Studio 20 Architects, London
Looking to transform your home with a double-storey extension? At Studio 20 Architects, our expert team specialises in innovative design and architecture, including double-storey side extensions. We provide complete double-storey extension services, guiding you through every stage from site surveys and concept design to detailed double-storey extension drawings, planning permission, and full construction oversight.
Undertaking a double-storey extension can be challenging, but as a trusted London-based extension company, we ensure your project runs smoothly, on time, and within budget, helping you create more space and enhance the beauty and functionality of your home.

Types of Double-Storey Extensions
- Double Storey Side Extension – Widens your property while preserving garden space, ideal for additional bedrooms or living areas.
- Double Storey Rear Extension – Expands the back of your home, perfect for open-plan kitchens, dining, or family rooms.
- Double Storey Extension Drawings – Visualise layouts and design details accurately before construction begins.
- Double Storey Extension Pricing – Understanding costs early helps keep your project within budget while maximising value and comfort.
Specialists in Double-Storey Extensions
At Studio 20 Architects, we are specialists in double-storey extensions, including double-storey side extensions and rear extensions. Our comprehensive process begins with a feasibility study, followed by des ,ign development and double-storey extension drawings to visualise your project.
We then handle planning application consultation and submission, building regulations and structural calculations, tender evaluation, contract administration, and full site supervision. Our expert architects focus on maximising available space while enhancing your home’s appearance. With clear steps, transparent communication, and attention to detail, we ensure your project runs smoothly, on time, and within budget.
Double Storey Rear & Side Extension Prices
We provide expert double-storey extension drawings, detailed planning applications, building regulation submissions, and structural calculations to secure approval for your project. Explore our double-storey extension pricing for transparent costs and professional guidance.
Why Choose our Architects in London?
If you’re planning a double-storey extension, get in touch to arrange a free consultation at our studio. Discover how our expert architects can transform your home and bring your dream extension to life.
Choose Studio 20 Architects for your double-storey extension projects and experience a seamless journey from design to completion. Our team combines creativity, technical expertise, and attention to detail to maximise your home’s potential. We deliver precise double-storey extension drawings, manage planning applications, building regulations, and structural calculations, and ensure projects are completed on time and within budget. With proven experience across Wandsworth, Richmond, Kingston, and surrounding areas, our expert architects provide transparent double-storey extension pricing, personalised guidance, and full project support, making your home transformation stress-free, efficient, and visually stunning.
Get a Free Quote for Your Double Storey Extension Project
Whether you’re considering a double-storey extension, a double-storey side extension, or a rear extension, our team is here to guide you. Contact us to arrange a free consultation at a time that suits you. During the session, our expert architects will listen to your ideas, provide professional advice, and create detailed double-storey extension drawings to help visualise your project.
We will also provide transparent double-storey extension pricing, ensuring you understand costs from the start. Call or email us today to start turning your dream home into reality.
Here’s what our clients have to say.

This was my first project and I was nervous at the beginning as every thing was new to us. Nadir was very helpful in guiding us through the entire project from planning stages to choosing materials to assigning builders; giving us assurances that the project would be finished on time and on budget. He also provided us with ideas for interior design. The build was of high quality with great care taken throughout. Geroge and his team were excellent builders and really gave us a peace of mind. There were issues with some of the materials (not their faults but due to Covid restrictions and the subcontractors), all of which were sorted out by Nadir and George between themselves. I’m hugely impressed by the after build care (nagging jobs and other issues). They were all addressed without fuzz.
A true test of a beautiful house is whether you are proud of showing it to guests. I’d say this project has passed this test with the highest score. We are still in love with the extension 3 years after it has finished. We’ve also received a lot of compliments from our guests.
I highly recommend both Nadir and George for their service.
Frequently Asked Questions About Double Storey Extensions
A double-storey extension adds a second level to your home, creating extra living space, bedrooms, or bathrooms while improving your property’s layout and overall functionality.
A double-storey side extension widens your home, allowing for additional rooms or living areas without compromising your garden or outdoor space.
A double-storey rear extension expands the back of your property, ideal for open-plan kitchens, dining areas, or family rooms, while increasing natural light and usability.
Double Storey Extension Pricing varies depending on size, materials, complexity, and planning requirements. We provide clear, tailored quotes to help you plan your project effectively.
Most double-storey extensions require planning permission, especially if they affect neighbours or exceed certain limits. Our team will guide you through the application process.
Completion timelines depend on project complexity, size, and permissions. Typically, a double-storey extension takes 4–6 months from design to finish, including planning and construction.
Yes, adding a double-storey extension can significantly increase your home’s market value, provide extra space, and improve functionality and aesthetics.
Our team produces detailed double-storey extension drawings to visualise layouts, help with planning submissions, and guide construction with precision.
We handle everything: feasibility studies, planning applications, design, double-storey extension drawings, building regulations, structural calculations, tender management, contract administration, and site supervision.
Our architects follow all building regulations and planning requirements, conduct thorough site surveys, and supervise construction to ensure high-quality results that meet legal standards.
We assess your property’s layout, budget, and goals, offering professional advice and design options such as side or rear extensions to maximise space and style.
Yes, we offer a free consultation where we discuss your ideas, provide expert advice, and deliver a transparent double-storey extension pricing quote for your project.
