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House extension ideas: before and after photos

4 min read
Oct '25 • by Heather

Quick summary

House extension costs vary depending on size and style, but a typical rear extension can start from around £1,500 per square metre, with larger projects often costing more. Planning and design help, especially for neighbours' concerns, are important, and extensions like glass roofs or bi-fold doors can add to the budget. Expect to spend several thousand pounds for a noticeable transformation.

Are you in the mood for some home inspiration? If the answer is yes, then brace yourself for some before and after delights.

While we all love to see the finished product, knowing where a homeowner started out can be vital to seeing the potential in your own space. After all, those fancy glass structures might feel out of your league until you see how dated the property was beforehand.

So if you’re ready to be impressed, here are some of the best before and afters from our photo gallery portfolio. These transformations showcase the possibilities of rear bungalow extensions, single storey rear house extensions and much more, all designed to turn your space into a dream home...

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This property had plenty of unloved and unused space that could be transformed into a stunning rear house extension, but being a semi-detached home, the owners also had to consider their neighbours.Therefore, in order to transform their long (and cramped) kitchen, they would need an architect to help balance their needs with those common neighbour concerns. With concerns like loss of privacy, overshadowing, and noise pollution, they needed an architect who could design a solution that balanced their needs as well as the surrounding properties.

To achieve this, and get the extra room that they needed, our designers chose to extend the property with a side extension. Taking the building out into that dead space at the side of the kitchen, we were able to create a bright, open-plan kitchen-diner. Large sliding doors now lead to the garden, offering not only stunning views but also a seamless connection to outdoor living.

How much does an architect charge?