Legal 7 min read
The Co-ownership Agreement: house rules, bills and guests
A Deed of Trust covers who owns what. A Co-ownership Agreement covers how you actually live together. Bills, guests, pets, noise and what happens when you disagree — here's how to write it down before you move in.
It's the missing piece after the Deed of Trust
The Deed of Trust is about money and ownership. The Co-ownership Agreement is about daily life. Both matter, and they do different jobs.
If the Deed of Trust is your pre-nup for the property, the Co-ownership Agreement is the household manual. It answers the questions that come up in the first month and the third year.
It isn't usually a legal document in the same formal sense, but it can be made binding if a solicitor drafts or witnesses it. At the very least, it becomes powerful evidence of what everyone agreed.
Deed of Trust
- •Who owns what percentage
- •Deposit and mortgage contributions
- •Buyout and exit terms
- •What happens on death
- •Prepared by a solicitor
Co-ownership Agreement
- •How bills are split
- •Guests, partners and pets
- •Noise, tidiness and shared spaces
- •How disagreements are resolved
- •Can be a signed household contract
Bills: split by share or split by use
This is the most common early argument. One person works from home and uses more energy. Another is away half the week. Someone owns a bigger share but uses the same broadband.
The cleanest approach is to separate property costs from living costs. Property costs follow ownership share. Living costs follow who uses what.
Put a default method in the agreement, then list the exceptions. Council tax, energy, broadband, water, buildings insurance, maintenance and any service charges should each have a rule.
Tap a card to flip it over.
Guests, partners and pets
These conversations feel awkward because they sound like relationship rules. But they are property rules, and they protect everyone's investment.
How often can someone stay over before they're effectively living there? After how many nights does a partner need to contribute? Can a room be let on Airbnb? Can someone get a dog without asking?
Write down the trigger points and the process. Most groups agree that a partner staying more than a set number of nights per month becomes a discussion, and any new pet or lodger needs unanimous consent.
- 1
Overnight guests
How many nights per month before it needs a conversation?
- 2
Partners moving in
Notice period, rent or bill contribution, and whether they need everyone to agree.
- 3
Pets
Allowed? Any restrictions? Who pays for damage?
- 4
Lodgers or Airbnb
Can a room be rented out, and who keeps the income?
- 5
Parties and noise
Quiet hours, advance notice for gatherings, and how to handle complaints.
Dispute resolution: talk first, write second
Every agreement should include a ladder for disagreements. Start with a house meeting. If that fails, bring in a neutral mediator. Court is the last resort, named as such.
Also name the practical tie-breakers. What happens if you can't agree on a £2,000 repair? On a new tenant? On whether to accept an offer when one person wants to sell?
Some groups give each person a small solo budget for urgent repairs, say £250, so no one has to wait for a vote when the boiler breaks. Above that, everyone agrees or follows the dispute process.
- 1
1. House meeting
Everyone gets the facts, no phones, and the agreement is on the table.
- 2
2. Written summary
Each side writes down their view and preferred outcome.
- 3
3. Mediation
A neutral mediator helps find a compromise. Usually settled in a day.
- 4
4. Independent advice
Each person takes legal advice on the specific issue.
- 5
5. Last resort
Court or a forced-sale clause, only if the Deed of Trust allows it.
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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