Main residence nil-rate band- RNRB (from 6 April 2017)
Meaning that each taxpayer has additional £175,000 to add to £325,000 if they leave their main residence to children. If unused it can be transferred to a living spouse
If you give away your home to your children (including adopted, foster or stepchildren) or grandchildren.
If you’re married or in a civil partnership and your estate is worth less than your threshold, any unused threshold can be added to your partner’s threshold when you die. This means their threshold can be as much as £1,000,000.