Avalon Builders delivers side extensions and rear extensions to transform the way in which you live. We can manage the construction of your new extension in London from start to finish, from obtaining planning permission and drawing up the initial designs all the way through to ensuring that the build is completed on time and on budget, regardless of any challenges faced by our expert builders.

Already have the space, but need to renovate it? Contact us to learn more about converting your loft or basement into a room for virtually any purpose. Perhaps you’re expanding your family and would like to create an extra bedroom? Or maybe you’re keen to create more storage space? Regardless of your requirements, our team will be able to design a stylish loft conversion or basement conversion in London to meet your requirements.

Along with introducing more much-needed space to your home, extensions and conversions can also add a great deal of value to your property. Rest assured that Avalon Builders will work to keep the cost of your extension as low as possible to maximise your return.


Our company has been providing extensions, loft conversions and basement conversions to London for nearly two decades. We’ve worked with all kinds of properties, from period homes to modern developments, liaising closely with our clients at all stages of the construction process to make sure their unique needs are met.

  • Financial responsibility to our clients
  • Superior quality and craftsmanship
  • Quality and value to the Projects We Deliver
  • On Time and on Budget
  • Real focus on customer satisfaction
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