Guarantor mortgages

A guarantor signs a separate guarantee on top of the standard mortgage paperwork. They are not on the mortgage as a borrower and they are not on the deeds as an owner. They are a backstop. If the borrower defaults, the lender can pursue the guarantor for the missed payments and, in extremis, for the outstanding loan balance.

Why traditional guarantor products are rare now

Lender appetite for traditional guarantor mortgages has shrunk over the last decade. Most lenders moved to Joint Borrower Sole Proprietor (JBSP), where the supporter is a named borrower on the mortgage and assessed for affordability formally, rather than a side-letter guarantor. Family-assist products like Track Record, Family Springboard and Deposit Boost also occupy what used to be guarantor space.

When a guarantor product still fits

Niche cases. Some lenders use a guarantor structure for adverse credit cases where a family member effectively underwrites the risk. Some use it for graduate or trainee professional schemes. Most first-time buyer cases that would historically have been guarantor are now better served by JBSP or family-assist.

What the guarantor signs up to

The guarantor signs a deed agreeing to step in if the borrower defaults. They do not own the property, they do not pay any monthly costs unless the borrower defaults, and they do not have any tax exposure on the property in normal circumstances. The guarantee is typically for a defined period, often the first five years, and lifts when the borrower has built enough equity or income to qualify alone.

JBSP versus guarantor on the same case

Take a buyer on £32,000 income wanting £240,000 of borrowing, with a parent on £55,000 willing to support. On JBSP, the parent is a named borrower, jointly liable, and the affordability calculation uses combined income. The buyer alone is on the deeds, no SDLT surcharge. The lender pool is large. On a guarantor structure, the parent signs a deed, the affordability is still mainly assessed on the buyer alone (with the guarantor as comfort), the lender pool is small, and the rate is often higher. On almost every case the JBSP route wins on borrowing, on cost and on lender choice. We rarely end up recommending a traditional guarantor product.

Family-assist alternatives

Track Record uses 12 months of rental payment history as evidence the buyer can sustain a similar mortgage payment, no family money required. Family Springboard takes a small cash deposit (typically 10% of property price) from a family member into a savings account at the lender, held for 5 years, returned with interest at the end. Deposit Unlock on new build is housebuilder-backed insurance that lets a small group of lenders price 95% LTV (Loan to Value) more competitively. Each fits a different case. We map your specific situation to the right product rather than push everyone into one mould.

The honest comparison

For most first-time buyers, JBSP is the better route. The supporter is on the affordability calculation directly, lender appetite is broader, the additional-property surcharge is avoided. We will only recommend a guarantor product if it is genuinely the right fit, which is rare.

Common pitfalls we see

Asking for a "guarantor mortgage" by name and getting routed to one of the few specialist lenders left in that space, rather than into a JBSP product at a mainstream lender on better terms. Assuming the supporter has no exposure (they do, even on a guarantor; the deed is enforceable). Not setting an exit date. We work the structure conversation up front and pick the product that actually fits the case.