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Everything you need to know about side return extension on a Victorian terrace

4 min read
Oct '25 • by Molly-Sue Moore

Quick summary

A Victorian terrace side return extension typically costs between £80,000 and £120,000, depending on size, materials, and location, with most projects taking around 3 to 5 months. It is often possible without planning permission if it meets specific size and height rules, but consulting an expert is recommended to ensure compliance.

If you have a Victorian terraced house and you’re looking to extend, a side return extension (sometimes referred to as a side infill) could be an excellent option for you. A lot of Victorian terraced houses have unused alleyways to the side of their property – filling in this space squares off the space and creates extra room.

Advantages of side return extensions on Victorian terraces

Hang on to your green spaces compared to other common extensions, like a rear extension, side return extensions use up ‘dead space’ that’s not being used for anything else, rather than digging into your garden. This makes it a great option for anyone living in cities or other areas where green space is scarce.

Maximise your light

Whether you opt for glass bifold doors, skylights or a glass structure, side return extensions can be a fantastic way to invite more natural light into your home. There’s evidence to suggest that plenty of natural light is beneficial for wellbeing, making a side return extension a potential great investment in both your home and your health.

Adding natural light to your Victorian terrace side return extension

Save time

Because many Victorian terraced properties already have the space available to extend into and the added square metres are relatively small, they can be more time efficient compared with other projects. And, although the numerical value of the space might not look huge, the extra space can be really transformative.

Add value

Taking advantage of your unused space and creating even more room, light and character is a fantastic way of adding value to your property. So, when you invest in a side return extension now, you’re investing in better offers from buyers should you decide to move in the future.

How much does an architect charge?