Garden flat extensions
London architect guide
Inspiration and ideas
London is home to a diverse typology of properties and home-owners with a variety of needs.
Garden flat extensions have to create specific solutions and no two projects are the same.
Consider GOAStudio London residential architecture as your problem solvers, who will help you create the right environment for your home and lifestyle requirements.
As part of this garden flat extensions architect guide we have selected some projects to lend architectural inspiration and design ideas for your garden flat extension.
For more advice and information see the following:
Royal Institute of British Architects (RIBA)
- Do I need an architect for my extension or home project?
- Why work with an architect?
- How do architects calculate their fees?
Planning Portal
Architect designed garden flat extension Kilburn Brent NW2 – Kitchen framed garden view
Hampstead architects flats amalgamation Living views to the garden
Kings Cross, Islington WC1 – Listed Building rear flat extension – Internal and external views
Architect designed flat extension Warwick Avenue Westminster W9 Kitchen area
GOAStudio London residential architecture
George Omalianakis, BA (Hons) B.Arch Pg Dip Environmental Design.
Chartered RIBA architect and ARB registered.
RIBA Conservation Registrant specialism in conservation areas, period and Listed buildings.
Residential expert contributor for magazines including Which? magazine and Ideal Home.
Last reviewed by George Omalianakis for GOAStudio: August 2026
Garden flat extensions London architect guide – Design aspirations and key considerations
The architectural elements and design ideas are not what primarily create the essence of a home. Yet the created spaces accommodate everyday routines, activities, and the little moments that make up our lives.
Extending a flat is not just a box-ticking exercise about house building plans, the number of bedrooms that can be created, and cost per square foot. Admittedly this seems to be the case especially with new-built houses and flats.
Ultimately however, it is the genuine quality of the space around us that is essential for a happy life.
This is what we aim to achieve for your home and we will need your help to understand what is important to you since this is what will drive our decision making.
Garden flat extensions London architect guide – Types and options for your home project
Garden flat extensions can be grouped in a variety of ways.
By asking how to extend:
Going up
This is difficult to achieve since planning policy tends to protect adjacent properties from the effect that first floor extensions tend to have on privacy and outlook.
It is also worth pointing out that flats have no Permitted Development Rights which restricts options even more.
Going down
This is an expensive and construction-intensive way of adding floor space and is best avoided unless absolutely necessary, especially in the context of recent planning restrictions to basement extensions.
Intelligently designed basement levels can still feel spacious and airy, with access to natural light, and in specific parts of London they can still be good value for money.
Going out
Rear and side extensions, by a single storey or more, traditional, contemporary, or a combination of both, typically aim to create a larger kitchen, dining and living space.
At the same times such extensions can ignite a better relationship between the inside of the house and the rear garden.
They tend to become the heart of the home, both in terms of the day-to-day life, but also as that special part of the home you can really stamp your aesthetic on, and transform to taste.
This is the most common type of flat extension.
All of the above
Because your needs might require a combination of solutions, and through the design development stage we will assess what is right for you and your project.
Or by asking why to extend:
More space
Because families grow, kitchen areas are never large enough, and there is never enough storage space for your growing future needs.
Better space
Because rooms can be dark, the living areas can be cut off from the garden, and everybody likes the convenience of an en-suite in the master-bedroom.
Adding value
Because of stamp duty costs, the desire to step up the property ladder, and because of overall old good common sense.
All of the above
Because our clients rarely have a single reason when embarking on their project.
And we often have to work our way through considerations of practicality, cost, value, aesthetics, sustainability, and regulations before we put pen to paper and start with the design process.
Design development stage
During the design development stage we will get to explore lots of ideas, but you can start the process now by considering answers to questions as such:
- “How long do we plan to live in the property, and how is our lifestyle likely to change over this time?”
- “What are the chances for a growing family, working from home, or picking up gardening as a hobby one day?”
- “Is this garden flat a place for us to grow into or is it a stepping stone to our dream property?”
- “What are the top three things we like about the flat, and what are the top three things we want to change as part of extending and re-designing it?”
- “Do we have a specific budget ceiling and which are the areas you want to focus the spending of most of our budget?”
- “What are the special elements of the design we do not want to compromise, and where can we be more flexible within the context of our budget?”
- “What are the provisions of my Lease or Share of Freehold Agreement, and how do we need to go about securing Freeholder Approval for the building works?”
Request a free Feasibility Review
If you're not quite sure what’s possible, or whether now’s the right time, we can help you make an informed start.
Send over your address, a few photos, and a short outline of what you're hoping to achieve.
We’ll take a look at your site context, planning history, and potential constraints and respond with early advice tailored to your home and circumstances.
Email us with the subject “Feasibility Review” or send us your information through our Contact us page.
Book a Home Consultation
It is the ideal first step if you are planning works to your home or if you are in the middle of purchasing a property in need of renovation.
George will visit the property to understand its character, how you use the space day to day, and offer advice on all relevant design and other matters.
You will come away with a clear sense of your next steps and greater confidence to make informed decisions. The consultation (2hrs, £250 +VAT) is a standalone service with no obligation to proceed.
Visit our Contact us page to book.
Not sure where to start with your renovation or extension?
Read this before you meet an architect, speak to a builder or spend money on drawings.
This free, architect-prepared guide walks you through the 15 essential questions every homeowner should ask before starting a project.
"Should we renovate, extend… or walk away?
15 Questions every London homeowner must ask before starting a project to include homes in Conservation Areas and Listed Buildings."
Whether you're planning a modest rear extension or major alterations to a listed home, it will help you avoid expensive mistakes and give you clarity on what’s possible for your property. Includes guidance on:
Planning approvals. Conservation areas.
Timelines and costs. Appointments you need to make.
Design and sustainability options.
When to press ahead and when to walk away
We provide architectural services for residential projects in the following London Boroughs:
Barnet, Camden, Enfield, Hackney, Hammersmith and Fulham, Haringey, Islington, Kensington and Chelsea, Lambeth, Lewisham, Newham, Tower Hamlets, Waltham Forest, Wandsworth, Westminster
We specialise in
- Greener homes
- Retrofit and energy efficiency for older and traditional buildings
- Conservation areas
- Listed Buildings
- Homeowner architectural services
- Property developments architectural services
GOAStudio London residential architecture limited.
86-90 Paul Street, EC2A 4NE, Hackney
Chestnut Avenue South, E17 9EJ, Waltham Forest
t: 0203 984 3005
