RZ Building Services Looking for high quality building services in London? About Us RZ Building Services Ltd are here to provide the whole package for all your building needs. We are highly skilled general builders offering a wide range of building services in North London. We are here to help you with all aspects of building including all renovation, refurbishments, extensions and new builds. We specialise in refurbishing homes which require close consultation with the client and a tailored approach to the high-end building and design techniques which we are proud to offer.