How much value does a self-contained annexe add? The short answer is, yes. It's estimated that you could add up to 20-30% to the value of your property. That's some serious value you could add to your home.

Is it worth building an annex?

If you have the space, a granny annexe is an excellent way to give teenagers their own space but still keep them close. They are usually more affordable than a care home if used over a number of years. Annexes are great for guests who prefer personal space.

How much does a granny flat add to property value UK?

However, it's estimated most granny flats will add between 20-30% onto the market value. A granny flat also gives your property a unique selling point and gives the property great 'saleability' as it can be let out, providing an extra stream of income.