House Extensions

In the era of “don’t move, improve”, Scenario finds itself among the top residential architecture studios in London for high-end house extensions. Our portfolio of distinctive, highly functional single-storey extensions, side-return extensions, rear extensions, basement extensions and loft extensions give period properties new purpose and help transform London’s architectural landscape.

We established Scenario in 2007 with a vision to maximise living spaces to their greatest potential. Our boutique practice takes a considered, collaborative approach to our clients’ habits, hobbies and aspirations, delivering contemporary house extensions that tell a story about the owners – not the architects.

Our landmark project Scenario House, an East London Victorian home with a unique, light-filled side-return extension, was covered widely by the media and shortlisted for several prestigious architecture prizes – including the 2018 RIBA London Awards. It demonstrates our innovative and tailored approach to building house extensions onto period properties for 21st century lifestyles.

Tell us about your house extensions

House Extensions

Edwardian house extension in London

House Extensions

Glazed house extension in London

House Extensions Your house extension project

Tackling London house extensions

If you plan to take on a house extension in London, we’re happy to help, whether you’re planning a single-storey extension, side-return extension, basement extension or rear house extension.

We’ve created a brief illustrated overview to help you understand each stage of the house-extension process.

Most house extension projects in London require planning permission from the local council. With our successful record securing planning permission on behalf of our clients, we can claim home advantage across London.


Discover if your chosen architect has had success pushing planning applications through your local council. Visit the “planning applications” section of your council’s website and enter the architect’s name in the search criteria.

House Extensions


To help you understand what it takes to obtain planning permission in London for a house extension, we’ve created this helpful guide. Download it below.
Planning guide

House Extensions Your house extension project & Scenario Architecture

Working with Scenario Architecture on your house extension project

Scenario is a boutique architecture studio focused on improving homes with spacious, contemporary house extensions across London and beyond. Through our bespoke architecture service, we tackle projects of every scale and complexity, from modest single-storey extensions to side-return extensions, basement extensions, loft extensions and rear house extensions.

Our highly skilled architects can take you step-by-step through the challenge of building a house extension. We’ll collaborate closely with you from the initial drawings, detail design and planning, guiding you through the tender and construction process and completing your house extension on time and on budget.

Early adopters of the latest drafting and building technologies, we use innovative 3D design and visualisation tools as a standard for all our house extensions. Our experience has shown that real-time visualisations and virtual reality are extremely efficient tools for choosing finishes, fixtures and fittings, and simulating natural light.

We use 3D building information modelling (BIM) to produce reliable construction information, so all our project data comes from an accurate 3D model. Using this technology collaboratively with consultants and contractors is proven to save our clients time and money. This Chartered Institute of Building case study featuring a Scenario project demonstrates the benefits of this advanced technology for house-extension projects.

Scenario Architecture is a RIBA Chartered Practice. We comply with all the criteria of the Royal Institute of Chartered Architects, covering insurance, health and safety and quality-management systems.

Start your house extension

House Extensions

Rear house extension, London

House Extensions

Conservation Area House Extension, London

House Extensions

Victorian Villa Glass Conservatory, London

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House Extensions In our clients words


We wanted to renovate our house in a conservation area in central London. Given this involved a complete demolition and new build with an extra floor on top, getting planning approval was always going to be tricky. Scenario did an amazing job on the new house ‘envelope’ and throughout the planning phase. We couldn’t have wished for better from them and having succeeded in gaining planning approval owe them a very big ‘thank you’.


Scenario designed a kitchen extension for us, and we are delighted with the results. The process was well organised, planned and delivered, and the whole team were a pleasure to work with. I would highly recommend them for their design, planning and project management skills.


Worked with these guys on the internal development of our office. From start to finish they were great. They got what we wanted first time and really made working with them very easy. Their aftercare has been great too helping us deal with something that they were not involved with in the first place. Will highly recommend them to anyone.

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