Guarantor usage in accepted rental applications more than doubled between January 2025 and July 2026, rising from approximately 9% to 18.4%, according to data from HomeLet. The steepest climb occurred in the first seven months of 2026, when the proportion jumped from 11.4% to 18.4%. The shift coincides with provisions under the Renters' Rights Act that prevent landlords from requiring multiple months' rent upfront, capping advance payments at one month's rent before occupation once a tenancy agreement is signed.
Letting agents and portfolio landlords now face a structural change in tenant risk assessment. The legislative removal of upfront rent as a financial buffer has pushed guarantor vetting from an occasional requirement to a routine part of nearly one in five tenancies. Average UK rents reached £1,369 in July 2026, and HomeLet data indicates renters typically spend around one-third of their income on rent when starting a new tenancy.
Guarantor requirements narrow the funnel
The shift creates immediate friction for overseas tenants and those without UK-based family or friends. Data from Foxtons shows almost two-thirds (63%) of its tenants come from overseas, a demographic disproportionately affected by guarantor requirements despite often having the income to afford rent. London rents increased by 9.9% in the two years to May 2026, rising from £2,088 to £2,294, according to Zero Deposit.
Letting agents face longer tenant onboarding times if guarantor searches become routine, with potential knock-on effects on void periods and administrative cost. No data has been published on guarantor rejection rates, tenant dropout rates during the application process, or whether the guarantor requirement is deterring applications before they reach acceptance stage. That gap matters. If guarantor requirements are filtering tenants out earlier in the funnel, the 18.4% figure understates the operational impact.
Mike Dawson, head of sales at Barbon Insurance Group, stated that guarantors are "no longer the exception" and attributed the shift to affordability pressures. He added: "While Renters Rights and the ban on rent in advance have added a further dimension, our data shows this is on top of the longer term trend."
Commercial pressure on guarantor products
The regulatory constraint on upfront rent creates an opening for proptech vendors offering guarantor insurance, rent guarantee insurance, or alternative affordability assessment tools. Barbon itself sits in this market, and the timing of the data release positions guarantor products as a necessary response to both affordability pressure and regulatory change.
The commercial read is straightforward. Landlords previously used multiple months' rent in advance as a liquidity cushion and screening mechanism. That option is now legislatively closed. Guarantor insurance providers and deposit alternative firms can pitch their products as the compliant substitute, but the cost and administrative burden shifts from tenant to landlord or agent. Margin pressure in the lettings sector makes that a harder sell unless void risk or tenant default demonstrably rises.
No independent landlord-side data has been published on whether guarantor requirements are increasing rejection rates or lengthening time to let. If agents are now routinely requesting guarantors where they previously accepted higher upfront rent, the tenant pool narrows and negotiation timelines extend. Both increase cost per let.