A 95% mortgage is a popular option for first-time buyers who often can’t afford to save up more than a small deposit.
Keep in mind that interest rates on a 95% LTV mortgage won't be as favourable as those on a mortgage with a lower LTV ratio. If you can manage to offer a 10% deposit, you’ll get much better deals.
It’s also worth bearing in mind that some mortgage lenders won't accept first-time buyers even with a 5% deposit, so make sure you check before applying.