Remortgaging to Buy Out an Ex-Partner's Share of the House in 2026/27

The two things that need to happen together

Buying out an ex-partner's share of a jointly owned property, whether following divorce, separation from an unmarried partner, or ending a joint ownership arrangement with a family member, generally requires two coordinated legal and financial steps: a transfer of equity to remove the departing party's name from the property title, and a remortgage to raise the funds needed to pay them their agreed share and take over the mortgage in one name (or with a new co-applicant).

Working out the ex-partner's share

The starting point is usually an independent valuation of the property (or agreed estate agent valuations), from which the outstanding mortgage balance is deducted to establish the total equity. That equity is then split according to the ownership shares recorded on the title, or as agreed in a divorce settlement or separation agreement, which doesn't have to be a straight 50/50 split, particularly where one party contributed a larger initial deposit or has other relevant financial circumstances.

Worked example: buying out an ex-partner

Property value: £380,000 Outstanding mortgage: £180,000 Total equity: £200,000 Agreed split: 50/50 (per the original ownership arrangement) Ex-partner's share to be paid out: £100,000

New mortgage required: The remaining party needs to raise £180,000 (to replace/take over the existing mortgage) plus £100,000 (to pay the ex-partner) = £280,000 total new mortgage, subject to passing affordability on their income alone.

Affordability check: If the remaining party earns £58,000/year, a lender applying a typical 4.5x income multiple would support borrowing of roughly £261,000 — below the £280,000 needed, meaning they may need to negotiate a lower payout, contribute savings, bring in a co-applicant, or explore a lender with more flexible multiples.

Stamp Duty considerations

Transferring a share of a property can trigger Stamp Duty Land Tax if the "chargeable consideration" (broadly, the value of the share transferred plus a proportionate share of any mortgage debt assumed) exceeds the relevant threshold. However, transfers made as part of a court order or formal agreement in connection with divorce or dissolution of a civil partnership often qualify for specific exemptions — this is a complex area where professional advice from a solicitor or tax adviser is genuinely worthwhile given the potentially significant sums involved.

What if the numbers don't work today?

• A Mesher order (common in divorce cases involving children) can defer the sale or buyout until a future trigger event, such as the youngest child finishing full-time education, keeping both parties on the mortgage and title in the meantime under a court-approved arrangement
• Selling and splitting proceeds avoids the affordability hurdle entirely, at the cost of both parties needing to find new accommodation
• Bringing in a co-applicant, such as a new partner or family member, can boost affordability for the buyout mortgage, provided they're willing to take on joint liability

Practical steps

1. Get an independent valuation to establish the starting equity figure fairly
2. Agree the split — via mediation, solicitors, or court order if divorcing
3. Check affordability on your income alone before assuming a buyout is achievable
4. Instruct a solicitor to handle the transfer of equity and coordinate with the remortgage lender
5. Check Stamp Duty implications specific to your situation, particularly if divorcing or dissolving a civil partnership

The bottom line

Buying out an ex-partner is achievable for many people, but it hinges on passing a mortgage affordability assessment based on a single income where two incomes previously supported the loan — worth checking early in any separation, before assuming the property can simply change hands informally. Where the sums don't currently work, a Mesher order or bringing in a co-applicant are genuine alternatives worth exploring with proper legal advice.