The UK housing market is facing renewed pressure as rising government borrowing costs and growing political uncertainty threaten to push mortgage rates higher and weaken buyer confidence, fresh analysis shows.

Bond yields have climbed sharply in recent days amid concerns over inflation, public spending and the prospect of further instability within the Labour party, with markets increasingly focused on the potential economic direction of any future leadership change. The rise in gilt yields is already feeding through into mortgage pricing, adding further strain to affordability across the housing market.

Tom Bill, head of UK residential research at Knight Frank, said the movement in gilt markets reflects a combination of renewed inflationary pressures and uncertainty over the UK’s fiscal outlook.

The 10-year gilt yield traded above 5% for most of last week, its highest level since the global financial crisis in 2008. The move has been driven in part by renewed inflationary pressures linked to energy price volatility following geopolitical tensions in the Middle East, which have left the UK particularly exposed due to its reliance on energy imports.

Alongside this, markets are also pricing in uncertainty over the UK’s medium-term fiscal outlook, including expectations around public spending and borrowing. Concerns about the potential inflationary impact of future policy decisions have contributed to upward pressure on government borrowing costs.

The rise in gilt yields is significant for the housing market because mortgage pricing closely tracks government borrowing costs, meaning sustained higher yields typically translate into more expensive lending for households.

While US Treasury yields have also increased since the escalation in Middle East tensions, they remain below 4.5%, highlighting the relative scale of the recent movement in UK debt markets.

The combination of higher energy prices and tighter financial conditions comes at a time when the housing market is already adjusting to affordability constraints, with any further increases in borrowing costs likely to influence buyer demand in the months ahead.

Bill said: “The key issue for the property market is what a new chancellor would mean for inflation. Handing out further public sector pay awards, for example, would be seen as driving it higher.

“Higher inflation expectations mean higher swap rates, which is the instrument lenders use to price fixed-rate mortgages. If borrowing costs continue to rise, it will dampen prices and, to a lesser extent, transaction volumes. It’s a calculation that buyers and sellers face if they are deciding whether to act now or this autumn.”

We have seen the gap between political ideology and the hard-headed reality of debt markets this week.

Paula Barker, an MP backing Andy Burnham for the Labour leadership, said that “markets will have to fall in line.” It follows previous comments by Burnham that the government had to “get beyond this thing of being in hock to the bond market.”

The prospect of political upheaval, looser fiscal discipline and higher inflation was a “toxic mix” for financial markets, said Pepperstone analyst Michael Brown.

“The simple way to avoid being ‘in hock’ to bond markets is to further consolidate the overall fiscal position, cutting public spending and demonstrating a degree of fiscal restraint, while also implementing growth-friendly policies such as tax cuts (in due course), and investment incentives,” he said.

“The UK will never struggle to sell its debt, or refinance obligations that are coming due. The issue is what yield investors demand in return.”

Knight Frank recently downgraded our house price forecasts for all UK markets as a result of the jump in borrowing costs but also the prospect of another tax-raising Budget as the government grapples with the economic fallout from the conflict in the Gulf.

Uncertainty surrounds not only what the chancellor might say this autumn but also their identity.

“I’m sceptical about a full scale move to a land value tax,” said James Nation, a former special advisor to Rishi Sunak at the Treasury. “It would take years to introduce, and the Labour Party will only have two ahead of the next general election. Plus, in the near term, they need additional revenue to top up public spending.”

UK property professionals remain upbeat despite rising uncertainty