House Extensions & Renovations in London

Fellner Construction is a London - based building company specializing in residential extensions and high-end property renovations. We transform houses into exceptional homes - designed for modern living while reflecting your unique style and personality.

We specialise in working with clients who are serious about quality, timeliness and long-term value. If you’re ready to invest in a project that’s executed with precision and care, let’s see if we’re a perfect fit for you.

What sets us apart is our unwavering commitment to transparency, communication, and customer satisfaction. We believe that collaboration with our clients is key to delivering homes that surpass expectations. From the initial concept and design phase through construction and final touches, we work closely with you every step of the way to ensure your vision is realized.

What Our Customers Are Saying

  • These guys are fantastic - very professional and excellent attention to detail. They worked very efficiently, talked through all the options and always ensured I was happy with the results. I would highly recommend them and will certainly give them a ring for any future projects - have already begun planning my bathroom and kitchen renovation with them. Good old-fashioned quality service with modern day efficiency. Job well done guys!

    Wes, TN2

  • Thoroughly pleased. From the initial quote onwards, everything was dealt with in an extremely professional manner. The job was completed very punctually, with no mess, and the results are far more than I expected. I can recommend Fellner Construction with absolutely no reservations.

    Gordon, DA12

  • The quality of finish, professionalism and complete integrity in which the manner and work was done has been second to none. Our whole house needed core re-structuring and team arrived early and worked late into the evening to keep on schedule and provided great stability in trying circumstances! I had no difficulty in entrusting them with keys/ free access even though we were away at work. I could not rate this company highly enough on all accounts, including the price which was more than competitive. 10/10.

    Rachel, CR3

  • I would thoroughly recommend Fellner Construction for the quality and care in the work which was undertaken. The team conducted themselves in a quiet and efficient manner and were very conscientious in their care to ensure that the working area, as well as the any passageways which they had to traverse were kept clean and tidy. This is a big plus for lady clients!! All in all Fellner Construction were highly competent and demonstrated great professionalism. As a professional project manager myself, I frequently work with many tradesman and I can rate Fellner Construction as being one of the very best. As a footnote, we have since engaged them to do further work for us, again delivering a very high quality result, and I will have no hesitation in recommending them to my friends and relatives.

    Tom, TN12