It is indeed. Buyers on a lower income can consider other options such as a guarantor mortgage or buy a property with a parent or close family member to help them purchase their first home.
The increased income from two or more applicants means that you qualify for a larger mortgage.
For example:
As a single applicant, if you earn £40,000 a year and have a £30,000 deposit, you would need a 90% mortgage against a property costing £300,000. Most lenders will offer up to 4.5 times your annual income, which would be £180,000 and not close to the £270,000 required.
If you have another applicant on the mortgage that earns £30,000 a year, your combined annual income increases to £70,000. On that basis, you could borrow a mortgage of up to £315,000 and easily cover the required value.