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House extension ideas: before and after photos

4 min read
Oct '25 • by Heather

Quick summary

House extension ideas vary widely, but on average you could spend around £1,500 to £3,000 per square metre for a rear or side extension, depending on design and materials. Smaller projects or simple designs may cost less, while larger or more elaborate builds, like glass structures, will be more expensive. Planning and design costs are also part of the total.

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?