At Three Counties Builders, we provide professional extension services to the people living in London, Buckingham and Hertfordshire. We assure our customers that all types of extension work will be performed by our team of local and highly skilled tradesmen. In your extension project, our team will work with you from the initial planning stage to the final completion. Our regular follow up pf work progress will ensure you that you are completely satisfied from our work that we have performed on your property. Having access to reliable and recognized material stores, we will offer you advice on where to buy your house material at a competitive price.