If it is less than two decades For the reason that house was done, remember to contact the builder or developer in the primary occasion. You can see a basic summary of Buildmark address here but you must generally Look at the certification and plan booklet precise to your own home. NHBC https://kingswoodhomes.uk.com/news/kingswood-homes-site-managers-win-double-nhbc-pride-in-the-job-quality-awards/