How Homeownership Through Roommate Income Helped This Buyer Beat High Interest Rates
Homeowners facing high interest rates are increasingly using rental income from colocation to qualify for mortgages that would otherwise exceed debt-to-income limits. By purchasing properties with extra bedrooms, buyers can leverage potential rental revenue as a “facilitator” to meet bank solvency requirements, according to industry professionals.
Bastien, a 33-year-old who sought a home purchase following a 2024 divorce, successfully utilized this strategy to secure a 200,000 euro loan. After selling a previous property, he faced a market where interest rates had climbed to approximately 4% in 2025, compared to the 1.5% rate he had previously held. By purchasing a 100 m² house from the 1970s for 202,000 euros and committing to host two roommates, he secured financing at a 3.6% interest rate over 20 years.
Did You Know? Banks typically factor in only 70% to 80% of projected rental income when assessing a loan application, a measure designed to account for potential vacancy periods, according to Laurent Bortoli, director of credits at La Banque Postale.
How Banks Evaluate Rental-Supported Mortgages
Financial institutions treat the inclusion of rental income on a case-by-case basis. Laurent Bortoli confirms that La Banque Postale considers this revenue in its solvency and debt analysis if it is necessary for the approval of the file. However, this strategy is not a guaranteed path to approval.
David Coquillaud, director of the Meilleurtaux franchise in Aix-en-Provence, notes that rental income should serve primarily as a “facilitator.” He warns that if a loan application is entirely dependent on future rental income, the risk is often too high for lenders. For a file to succeed, the overall financial profile must remain fundamentally solid, with rental revenue acting as a bridge to cross the 35% debt-to-income threshold.
Expert Insight: Samantha Carter observes that while this strategy effectively lowers an individual’s monthly debt burden, it introduces a reliance on external tenants. The trade-off involves transitioning from sole occupancy to a shared living environment, which requires both long-term personal commitment and the financial discipline to maintain the property for renters.
Financial Implications and Future Risks
For Bastien, the arrangement covers 1,000 euros of his 1,260-euro monthly mortgage payment. Without this income, his estimated debt-to-income ratio would have reached approximately 43%, placing it well above standard lending limits. He supplemented his 15,000-euro down payment with 50,000 euros in renovation costs, supported by personal savings and family assistance.
Looking ahead, the longevity of this arrangement remains uncertain. Bastien acknowledges that if his personal circumstances change, such as entering a new relationship, he may discontinue the colocation. Laurent Bortoli notes that banks are aware of these “accidents of life,” such as separations or changes in household composition, and structure credit agreements to include a degree of operational flexibility to handle such transitions.
Frequently Asked Questions
What percentage of rental income do banks typically count toward a loan application?
According to Laurent Bortoli of La Banque Postale, banks generally account for 70% to 80% of the projected rent to protect against the risk of periods where the property may be vacant.
Can I get a loan if my debt-to-income ratio is above the limit without roommates?
David Coquillaud of Meilleurtaux suggests that rental income can help a file “tip to the right side” if the borrower is slightly over the 35% limit, but the core loan application must be inherently solid to be approved.
What happens if the homeowner’s personal situation changes?
Credit agreements are designed with built-in flexibility to accommodate life events, such as moving in with a partner or other personal changes, which lenders typically factor into the long-term analysis of the file.
Would you consider sharing your home with roommates to reduce the financial burden of a mortgage?