What a JBSP mortgage actually commits you to
As a joint borrower you sign the mortgage deed alongside the owner. Your liability is joint and several: the lender can pursue you for the entire monthly payment and the entire outstanding balance, not a proportion. Missed payments affect your credit file exactly as if the property were yours.
What you do not get is ownership. You are not on the title, you have no automatic right to live in the property or to a share of its value, and you cannot force a sale to release yourself from the mortgage. If your circumstances change, getting off a JBSP mortgage requires the owner to remortgage without you, which they may not be able to do.
Why the lender requires ILA
Liability without benefit is the classic scenario in which someone later argues they did not understand what they signed, or signed because a family member pressed them to. English case law on undue influence means such a challenge could threaten the lender's security, so the lender requires each non-owning borrower to be advised by an independent solicitor and to provide a signed certificate before completion.
For the joint borrower, the appointment is worth taking seriously rather than treating as a formality: it is an independent professional's explanation of a long-term financial commitment made mostly for someone else's benefit.
What the appointment covers
The solicitor reviews the mortgage offer and deed, then explains: the full extent of your liability, the fact you gain no ownership interest, the effect on your own future borrowing capacity (the JBSP mortgage counts as your debt in any affordability assessment), what happens if the owner stops paying, and how difficult exiting the arrangement can be. They confirm you are acting freely, then sign the lender's certificate.
Appointments are typically 20 to 40 minutes. Most JBSP lenders accept video-call advice, and the certificate is usually signed the same day.
Cost and how to arrange it
ILA for a JBSP borrower is a fixed-fee service, typically £150 to £250 at standard turnaround, more for 48-hour or 24-hour service. The conveyancer handling the purchase cannot give the advice, because they act for the owner, so you need a separate firm.
Only the non-owning joint borrowers need ILA. The proprietor is represented by the conveyancer and does not need a separate certificate. Where two parents join one mortgage, some lenders allow both to be advised in one session; others require separate advice, so check the offer conditions.
Need an ILA certificate for joint borrower sole proprietor?
Compare fixed prices and turnaround times from SRA-regulated solicitors who offer exactly this advice, and contact them directly.
Compare solicitorsFrequently asked questions
Who needs ILA on a JBSP mortgage?
The joint borrowers who are not on the title deeds. The owner (the sole proprietor) is advised by the conveyancer handling the purchase and does not need a separate certificate. If two people are joining as non-owning borrowers, both need advice, sometimes in one session and sometimes separately depending on the lender.
Can the conveyancer doing the purchase give the joint borrower ILA?
No. The conveyancer acts for the property owner, so they are not independent for this purpose. The joint borrower needs a solicitor from a different firm, which is what the ILA requirement in the mortgage offer means in practice.
Does being a JBSP borrower affect my own mortgage or credit?
Yes, and this is a core part of what the ILA appointment explains. The full mortgage counts as your debt in any future affordability assessment, and missed payments appear on your credit file. You carry the downside of the mortgage without owning the property.
How much does JBSP independent legal advice cost?
Typically £150 to £250 as a fixed fee at standard turnaround, rising to roughly £250 to £500 for 48-hour or 24-hour service. Video-call appointments, which most lenders accept, tend to be at the cheaper end.
This guide is general information about how independent legal advice works in England and Wales, not legal advice on your situation. Lender requirements vary; always check your offer conditions. For advice you can rely on, speak to an SRA-regulated solicitor.