NestInsights

NestInsights works out buy-to-let numbers for England and Wales from its own calculator and official data, so Claude can repeat real figures instead of estimating them.

Two read-only tools:

• check_deal: give a purchase price and monthly rent, plus any other figures you know. It returns the cash needed to buy, stamp duty or Welsh Land Transaction Tax under the dated rules, the mortgage, monthly cash flow, gross and net yield, return on cash, and the profit after tax in your own name and in a company, with a verdict and the three checks behind it. It says which typical costs it assumed, and it gives a link that opens the same deal on nestinsights.com so you can change any figure. With a full postcode, it adds the neighbourhood's type, its five-year change in home values and its most similar neighbourhoods.
• area_figures: give a postcode, council, town or neighbourhood. It returns the council's average price, rent, gross yield and growth from the UK House Price Index and ONS rent data, and for towns and neighbourhoods their sold prices from HM Land Registry, the five-year change, the neighbourhood type and the most similar neighbourhoods, with links to the area pages and the data credits.

Free, with no account or sign-in. The figures are not kept; only a daily count of calls is. Figures and explanations, not financial, tax or mortgage advice.