Cjsmiths Builders St Albans is an independent family-run home extension company based in St Albans with over 13 years of experience! We understand that building a home extension can be stressful, trust us weve been there ourselves with our family home. This is why we treat your home like its our own providing the highest level of service and care. An impeccable reputation is hard to achieve, with 5* reviews and 90% of our work coming from recommendations.