Although the NHBC guarantee is for 10 years, remember that this is from construction i.e. if there have already been a couple of owners it may have expired or be nearly up. During the first 2 years, NHBC will step in if you make a claim against the developer and they do not carry out any remedial work. So if your property is less than 2 years old ensure you keep this date in the diary. Check your warranty (whether new build or at purchase) that it includes “snagging”, the term used for getting little issues like squeaky or stiff doors sorted.