Some lenders may be reluctant to offer a mortgage to those who are self-employed. This is because salary is one of the biggest determiners for your eligibility. If you are self-employed and cannot demonstrate that you earn enough annually to cover your repayments, you may struggle.
The good news is, it’s not impossible. You’ll need to show your lender between one to three years of accounts to prove you have sufficient profit and income from your business and demonstrate your ability to come up with the deposit. If you've sent your Self-Assessment tax return to HMRC for the past 4 years Tax Overviews or a SA302 should be sufficient. You can also show them work records, for example details of upcoming projects or retained accounts.
Luckily, a £60,000 mortgage is a relatively small amount to borrow, so you may not have to show your business is making huge profits, assuming your business trades successfully throughout the year and year on year profits are stable, or increasing.