We usually ask whether switching a broadband or energy deal pays for itself, but the same bills quietly decide how much a mortgage lender will offer. Fixed monthly commitments are not background noise to an underwriter; they are part of the affordability test.
Committed bills are part of the affordability test
When a lender stresses your budget, regular outgoings come off the top before the mortgage is even considered. Broadband, mobile, energy and water are all in that list, alongside credit commitments and subscriptions. A household paying top-of-the-range tariffs on everything simply shows less spare income than one that has shopped around, and over a long mortgage term that gap matters. Our energy and water guide walks through the bills that tend to be overpriced by default.
Price rises eat the headroom you planned on
Mid-contract increases make this harder to plan, because a bill you signed up to can climb partway through the year. We logged the 2026 round in our piece on every provider’s mid-contract rule, where the largest fixed rise reached forty-eight pounds a year. That is not a fortune on its own, but several rises landing together can trim the surplus a lender wants to see. Trimming those bills before you apply is one of the few things a buyer actually controls.
Turning lower bills into borrowing power
Once the regular spending is tidy, it is worth seeing what that means for a loan. A broker can compare lenders rather than relying on one bank’s calculator, and buyers near Romford can start at https://www.alittlemortgageadvice.co.uk/locations/romford-mortgage-broker/ to have the figure checked. The MoneyHelper affordability calculator is a neutral place to sanity-check the same numbers first. Cheaper bills will not transform what you can borrow, but they rarely hurt the application.
Written by The Bill Check. General information on household bills, not financial advice; figures current for 2026.…