Flat Conversion in London

Have you ever thought about turning a larger home into multiple apartments – or transforming several flats into a single-family space? That’s exactly what a flat conversion is about. Whether you are looking to maximize space, or create opportunity through the creation of flats, a well-planned conversion can unlock a lot of potential.

In a city like London, where space is limited and housing demand is high, conversion properties are more than just a trend – they’re a smart way to maximise the spatial prospects of a property.

Let’s take a closer look at the opportunities available for flat conversions and how we can help bring your vision to life.

Looking for Experienced Architects in London?

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.

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Typical Flat Conversion Opportunities

Flat conversions have a range of benefits which could include increased functionality and enhanced spatial sensibility. Here are some examples of how a property may be converted into a flat or from a flat into a single dwelling.

Single dwelling to multiple flats. Split one larger home into two or more self-contained units – ideal for creating shared living spaces.
Multiple flats to single-family homes. Combine individual units to create a spacious, unified home. Perfect for growing families or clients looking for generous layouts.
Loft or basement conversions. Maximise space by converting ancillary spaces into fully functional flats, creating value and liveable space without changing the footprint of the building.

With years of experience as residential architects, we understand how to make the most of London’s diverse house types – from period homes to post-war developments.

Why Choose Flat Conversion As A Service

Flat conversions require careful design, structural planning, and a strong understanding of local planning and building regulations. As an experienced architect studio, we have the expertise required to handle various types of flat conversions as displayed by our project portfolio. .

Our team works closely with each client to understand their needs and create both practical and beautifully designed spaces. Whether you’re converting a Victorian terrace or a modern apartment, we bring the same level of attention to detail and commitment to quality.

We also offer a full range of architectural services, providing continuity from the initial concept through to completion. From handling planning permission to coordinating with engineers and contractors, we take the stress out of the process.

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Our Flat Conversion Process

We follow a clear, step-by-step process to ensure every flat conversion is thoughtfully designed:

Concept

Briefing & Survey

Armstrong Simmonds Architects will work with you to develop a concept design, sketching layout options to explore the potential of the property. We will also carry out a full measured survey of the property and its surroundings, allowing us to produce an accurate set of drawings.

Planning

Application & Scheme Design

Following on from the briefing we will prepare a set of scale drawings reflecting the range of ideas discussed. We will prepare and submit the planning application, liaising with the council as needed throughout the process. Our extensive experience will help facilitate a smooth planning process.

Visualisation

3D Modelling Services

To help you visualise the space in three dimensions we can produce internal and / or external views of your project. This can also be a useful tool to demonstrate the merits of the scheme to planners.

Technical

Building Control and Detailing

We will produce detailed technical drawings including drainage and electrical layouts, consulting with you to ensure the design meets your needs. We will then submit to building control and manage the approval process. As part of our architectural services during this process we can assist you in appointing other consultants, for example the structural engineer or party wall surveyor.

Specification

Interior Architecture and Schedules

We offer interior architecture and design for a high spec finish. We can produce further detailed information integrating specialist glazing components, floor finishes, joinery and bespoke staircase design as required.

Interior Design

Furniture, Fittings & Equipment

We provide Interior design architecture services ourselves or through collaboration with other London based Interior Designers, who may also be appointed by the client.
We are happy to specify FF&E (furniture, fittings and equipment) for the project, providing a complete “one-stop” shop for your development.

Tendering

Prices and Builders

We will help you make an informed choice on an appropriate contractor. We maintain a selective tender list of contractors especially in the local London area, who we have experience working with on site. We will prepare tender documentation and appraise their quotes.

On Site

Contract Administration

Armstrong Simmonds Architects facilitates the implementation of the design by administrating a contract between you and the contractor. Amongst a wide array of architectural services, this will include undertaking site visits to monitor the quality of construction and handle any on-site queries from the contractor.

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chris walters

We are glad we found Armstrong Simmonds Architects to help us on our first project. We had bought a run-down terraced house near Clapham Common with the goal of extending and refurbing to increase value. John initially impressed us by first listening carefully to what we wanted to do, then showing us creative ways to achieve the results and finish we were looking for.

Safe to say we certainly have managed that and both John and Alan have been instrumental in doing so. The guidance and consideration at every step have exceeded our expectations and Alan’s attention to detail during the build has been critical for the high standards we have set for this project.

They have provided us with a service which reflects every stage of the design and build. Starting with the initial drawings, schedule of works, tendering and interior design. We also employed ASA for Contract Administration to be the key middle-man between us and the builder, which they were happy to help.

We are now underway with our second project with ASA and they have been able to deliver the final drawings for planning within a fairly tight time frame, without hindering on quality. I know the whole team worked hard to help bring our vision to life and it’s been brilliant working with them over the last 18 months. They have shown a great ability to solve any issues that arose quickly and are able to communicate effectively with different contractors at all levels. I have no doubt the next redevelopment project will go well.

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Matt Wood

We chose Alan and John for our extensive project and incredibly pleased with that choice and the result. We have a Victorian terraced house and wanted to do a classic loft conversion and ground floor extension. The Armstrong Simmonds team provided a vision which achieved our goals, but with a design we could have never have thought of ourselves which we love. We used them from start to finish and are incredibly glad we did. Alan supported us through the tender and renovation processes, and we are incredibly pleased with the end-product and the quality of work of builder Cezar of Vecchini. We would highly recommend Armstrong Simmonds for their vision, design thoughtfulness and exceptional assistance through the project. Thanks team!

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Dom & Kamilla

We worked with Alan and the team from Armstrong Simmonds for 3 years from start to finish to achieve the full renovation of a London townhouse. It was a challenging brief given the nature of the property but collectively what has been achieved is an outstanding end result. Alan and John thoughtfully incorporated our vision with the realities of converting an old Victorian house and the scrupulous attention to detail, symmetry and balance achieved in the design were instrumental in us choosing Armstrong Simmonds in the first place.

In addition Alan supported us through the tender and during the renovation working with our excellent builder Cezar of Vecchini to deliver the brief. I would highly recommend if you are looking for a team to turning your vision to the end product with a very high attention to detail while still being good humoured and a generally great guy to work with. Thanks again team. Dom and Kamilla

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Michael van Ree

John and his team have been brilliant to work with for our full house renovation and extension in SW London. Our house is quite unique and that combined with it being in a conservation area we knew it wouldn’t be a straight forward planning process – but Armstrong Simmonds did a fantastic job and helped us navigate us through every step. We couldn’t be happier with the detailed design and outcome.

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FAQ

What are the benefits of a flat conversion?

Flat conversions can enhance value by creating additional living spaces, which could provide rental income opportunities. They're also a smart way to adapt older buildings to serve modern living requirements, an alternative to buying a new property.

How long does a flat conversion usually take?

Timelines vary depending on the project's size and complexity. Typically, smaller conversions like lofts can take a few months, while larger conversions might take six months or more from construction start.

Do I need planning permission for a flat conversion in London?

In almost every scenario we recommend consulting the council on any proposed change – especially flat conversions. Our team will review your project brief and the necessary planning regulations when developing a proposal for your project before proceeding to submit an application.

Can you help with the entire flat conversion process?

Our expertise covers initial design through to planning and technical stages for construction. We can also assist our clients with appointing a builder for construction through tendering following the production of our technical drawings.