A granny annexe is the ideal solution for offering a young family member their own space in your home while they save up for their own house, or to help an older relative have some independence while keeping them at a safe distance. But how much do they cost to build in Washington?

Building a granny annexe ranges from £85,960 (Dry Tec based in DH6) to £89,800 (David Robertson builders based in Sr4), but these are just estimates that can help give you an idea of who will be better value in your area.

The best thing to do is to get quotes to build a granny annexe in Washington by posting a job with HaMuch. We will send it to extension builders in Washington who will be happy to help you.