ABM builders are experts in extending and improving homes throughout Sussex, Surrey and the south east. We are specialists in loft conversions, home extensions, dormers, new builds and maintenance for residential and commercial buildings. Full design and build service. References & examples. Fixed estimate no extras. Skilled qualified tradesmen. Craftsmanship and reliability. 10 Year insurance backed guarantee. Traditional building skills with the latest technology making sure that the design is kind to your pocket and the Environment. certified members of Federation of masterbuilders. Constructionline. Masterbond insurance scheme. Home extensions and building in Horsham