Side Return Extension

Homeowners in London are always seeking to maximise the living space of their property, and a side return extension is a perfect way to achieve this objective. 


Land is at a premium, and a side return extension is one of the most popular ways for homeowners to increase the internal living area of their home and add equity to their property.


As a result, the side return to a semi-detached house is one of the most common build projects in London, offering homeowners an efficient way to expand the living area of their home without losing valuable and usable garden space.


NHBC-registered building firm Fittra has over 15 years of experience in building side return extensions for clients across the London area. We can help you expand your home and give you and your family a perfectly designed and executed living open-plan living space.

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Design and Build Side Return Extensions in London

If you own a period terrace or semi-detached home in London, you’ll often have a narrow corridor along the side of your property. Whilst this space had its use in Victorian times, today, this area offers little use. As a result, many homeowners today choose to reclaim this area of land to increase their living space.


With Fittra, you’re not just choosing a contractor, but a partner dedicated to realising your vision for your home. We can craft various designs for your side extension in countless shapes and forms. Our team understand that every homeowner has unique requirements. So whether it’s a spacious, light-filled open-plan kitchen or a cosy family room you envision, we cater to your needs without compromising your garden space.


Incorporating a side return extension to your semi-detached house in London bolsters space and light and revolutionises your living environment. When choosing a reliable builder like Firttra, we ensure your side extension project aligns with your expectations and lifestyle, promising an enhanced living experience.

Planning Permission for Side Return Extension

For many, venturing into a home extension project can seem daunting, especially when considering planning permissions. However, in many cases, you’ll find that planning permission for a side house extension in London is not always necessary.

  • Not Required: If your side extension falls under the Permitted Development Rights, you won’t need planning permission. This includes restrictions like single-storey rear extensions not exceeding 3 metres in depth for an attached or 4 metres for a detached house.
  • Required: Planning permission becomes mandatory if your property sits in a conservation area or if your extension will be near a road.

However, don’t worry about these regulations – Fittra is here to help. Our team provides comprehensive support with all planning permission and agreement matters. 

Additionally, we offer robust liability insurance coverage of £5 million to give you that extra assurance. With Fittra, your house side extension in London will be a hassle-free experience, backed by expert guidance at every step.

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Cost of Side Return Extensions

Are you contemplating a side extension but wary about the costs? Let’s break it down for you. 


The average cost of side return extension relies on various factors:


Size of the area to be extended

Specifications of the build and the interior finishes

Location of the build


For example, a small side return extension cost will naturally be less than a larger addition. The average side return extension cost in London is between £40,000 and £60,000.


It is important to remember that living space is at a premium in London. Many owners of terraced houses don’t have a large rear garden, which makes it impossible to build to the rear of the house. 


Therefore, in many cases, the only solution is to build a side return extension terraced house. So a side return extension represents a very good investment, as it will add a lot of value to your home.


Project costs can be minimised by working with a construction company that will give you a thorough and detailed project cost breakdown so that you can be sure that there will be no surprises down the line.


To avoid any unwelcome surprises, align with a construction firm offering a detailed project cost breakdown. That’s where Fittra comes in. Here’s how we ensure you save money and gain value:


A thorough breakdown of costs before project commencement

Free consultation to understand your requirements better

Transparent billing – you only pay a 10% deposit, and then for the work done

A dedicated project manager accessible 24/7 to ensure seamless execution

Our unwavering commitment to surpassing client expectations and delivering a hassle-free build project


Want to learn more? Get in touch with Fittra for a free consultation. Let’s explore how your vision of a side return extension costs in London can translate into a beautiful reality.

Interested in side return?


Why Work With US

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at all stages

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with project manager

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liability insurance

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of works

Integrated, In-house Team Will Work On Your Project

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Benefits from our trade discounts
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£5M public & products liability
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10% only deposit payments
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Detailed cost breakdown

In the End You Will Get




Our Projects

Do you have questions?

Frequently Asked Questions

What is a side return extension?

An extension to the side of the house is a popular home improvement strategy in London, particularly in Victorian and Edwardian terraces. It utilises the often-narrow strip of land that typically runs alongside the ground floor area of a house, turning it into useful living space. 


This could be anything from a small side return extension creating a bigger kitchen or dining area to a grand glass side return extension adding a dash of modernity to a traditional home. With Fittra, you can transform your side return garden into an architectural masterpiece.

How much does a side return extension cost in London?

The average cost of a side return extension in London is between £40,000 and £60,000. At Fittra, we strive to offer competitive prices while delivering high-quality side return extensions tailored to your specific requirements and budget.

Do you need planning permission for a side extension in the UK?

Getting a side extension for your home generally tends to be hassle-free, although there are specific rules to follow. If your side extension is within the realm of Permitted Development Rights, there’s no need for planning permission. Yet, if your home is located in a conservation zone or the extension is close to a public road, you may need to seek planning approval. At Fittra, we make it easy by dealing with these complications for you, guaranteeing a seamless, worry-free experience from the project’s initiation to its completion.

How long does a side return extension take?

The duration of a side return extension project can vary depending on factors such as the project’s size, complexity, and whether planning permissions are needed. When you choose Fittra, you can be assured that we prioritise efficiency and strict time management to complete your project on time and with minimal disruption.

Does a side return extension add value to a house in London?

Absolutely! Even a small extension, such as creating a slightly larger kitchen or utility area, can add about 12% to the value of a London property. Investing in a side return extension in London is a smart way to enhance not just your living space but also the potential resale value of your home. With Fittra, the costs of a side return extension are an investment in your future.

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