Article 4 of 9·Ownership 7 min read
Exit planning: what happens when one co-buyer wants out
A job abroad. A new relationship. A change of heart. Someone will want to leave before the mortgage ends. Sort out how that works while everyone still likes each other.
Assume someone will leave
Over 25 years, the chance that four people all stay put is basically zero. Planning for an exit isn't pessimism — it's the thing that lets everyone say yes with confidence.
The goal is a process everyone signed up to back when they were getting on, so nobody has to negotiate it during a stressful month.
The standard way out
Almost every good agreement follows the same four steps. Write them into your Deed of Trust with real numbers, not vague intentions.
- 1
Notice
The person leaving says so in writing, usually three to six months ahead. Many groups also set a minimum of one or two years of ownership before anyone can leave, to stop snap decisions.
- 2
Valuation
An agreed method produces a price. Important: they get a share of the equity, not of the sale price — the mortgage comes off first.
- 3
First refusal
The people staying get an exclusive window, usually 60 to 90 days, to buy the leaver's share.
- 4
Replace or sell
If they can't afford it, the group can bring in a new co-buyer everyone (and the lender) accepts — or the house is sold and the money split by share.
Fill in your own notice period and deadlines. The shape stays the same.
What the leaver actually walks away with
This trips people up constantly. If the house is worth £320,000 and you still owe £240,000, there's £80,000 of equity. A 25% owner is entitled to a quarter of that £80,000, not a quarter of £320,000.
Selling costs, early repayment charges and any IOUs recorded in your deed come off before the split too.
Home valued at
£320,000
Mortgage still owed
£240,000
Equity left over
£80,000
A 25% share is worth
£20,000
Simplified. Real figures also come down after fees, legal costs and anything owed between owners.
The remortgage hurdle nobody expects
Buying someone out usually means going back to the bank and proving the remaining owners can carry the whole mortgage on their own.
If they can't, the buyout fails — no matter what your agreement says.
So plan for it. Write down what happens when a buyout is blocked by affordability, and put a limit on how long the group has to keep trying before the house goes on the market.
When it all goes wrong
Include a short list of things that let any owner force a sale: months of missed payments, bankruptcy, a clear breach of the agreement, or simply the buyout window running out. Without it, someone can be stuck for years.
Add a route for disagreements too: talk first, then mediation, then court as an absolute last resort. Naming mediation up front keeps most fallouts out of a courtroom.
Cheap and quick
- •A proper conversation with the deed in front of you
- •A neutral mediator, often settled in a day
- •Costs hundreds, not thousands
- •Relationships usually survive it
Slow and expensive
- •Solicitors' letters going back and forth
- •A court application to force a sale
- •Can run to five figures and many months
- •Relationships usually don't survive it
Quick check — 4 questions
Every answer is in the article above. Get 3 of 4 right to complete the quiz — sign in to save your score.
1. What are the four steps of a standard exit?
2. A home is worth £320,000 with £240,000 still owed. What is a 25% owner entitled to?
3. What commonly blocks a buyout even when the agreement allows it?
4. What's the cheap, relationship-preserving route through a serious disagreement?
Talk this through with the community
Nothing here is advice for your situation. Bring your questions to other locked-out buyers working through the same decisions.
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