Keep or sell BTL

Three pressures have landed at once. The Renters’ Rights Act 2025 changed how tenancies and possession work; fixed-rate mortgages taken at 1% to 2% are maturing into much higher refinance rates; and every rental is set to need the band C standard by 1 October 2030, at a capped cost of up to £10,000, once the regulations are made. Together they have pushed many landlords to ask whether a property still pays its way. This tool puts the cash-flow side of that decision on one screen.

The maths is deliberately simple. Annual rent, minus the new mortgage interest (loan times rate, the interest-only basis most buy-to-let runs on), minus your running costs (insurance, maintenance, licensing and any agent fee) gives your net cash flow. A property that was comfortably positive at 2% can tip negative at 6%, which is exactly what is happening to many landlords refinancing this year. Seeing that number clearly is usually more useful than any general “is buy-to-let dead?” article.

The EPC C bill is the swing factor. A one-off cost of several thousand pounds to reach band C can wipe out years of thin cash flow, so the tool shows how many years of profit the works would take to recover. If that number is small, the bill is an inconvenience; if it is large, or the property is already loss-making, it often tips a marginal hold into a sell. Run the EPC grant finder first, because grants can cut that bill substantially and change the answer.

If the numbers point to selling, the route matters. Section 21 is gone, so to sell with vacant possession you serve a Section 8 notice on Ground 1A: four months’ notice, and the tenancy must have begun at least a year before the date in the notice. Once served, you cannot let or market the property until 12 months after the earliest court date in the notice, unless an exception applies. Breaking that is an offence with a council penalty of up to £40,000, so you cannot quietly go back to renting if the sale falls through. Selling with the tenant in place avoids all of this.

Treat the output as a starting point, not a verdict. It is a cash-flow lens: it does not value capital growth, the capital gains tax due when you sell, void periods, or your own tax position and plans. Two landlords with identical numbers can rightly reach different decisions. Use it to frame the question, then take regulated mortgage, tax and legal advice before you act.