This tool will help you estimate how much you can afford to borrow to buy a home. We’ll work it out by looking at your income and your expeniture. Use the tool as a guide as we will obtain basic information from you, this will enable us to review your case on an individual basis and establish your maximum borrowing requirements.

https://www.moneyadviceservice.org.uk/en/tools/house-buying/mortgage-affordability-calculator

This calculator can be used for residential property or non-residential property.

The calculator works out the Stamp Duty Land Tax (SDLT) you'll have to pay for residential purchases (including lease premium) using new rules effective from 4 December 2014. It also shows how much SDLT is due under the previous rules and for non-residential purchases.

Please complete all the sections below.

You can't enter a value for both the 'Residential' and 'Non-residential' property purchase price, so please enter a zero in the one that doesn't apply to you.

http://www.hmrc.gov.uk/tools/sdlt/land-and-property.htm