While your mortgage deposit is likely to be the biggest thing you need to save up for, there are a few others things you'll need to pay for.
Solicitor fees. These vary depending on your solicitor but it's a good idea to factor in at least £2,500 for this cost.
Stamp duty. Use a stamp duty calculator to find out exactly how much you may need to pay - you may not need to pay anything, but this depends on if you're a first-time buyer or not, if you're planning on living in the house and how much the property will cost.
Moving costs. If you plan to hire a van or movers, you'll need to factor this cost in.
New furniture. This can be bought over time but you might like to include this in your budget if you know you'll need to buy some furniture as soon as you move in.
Mortgage advisor fees. Some mortgage advisors are paid by the lender you take your mortgage out with, but some will charge you for their services. It's worth finding this out before you ask them to help you.