Owning real estate with another person can be financially rewarding, but it can also lead to serious legal conflicts when the co-owners disagree. These disagreements are especially common when one person wants to rent out the property, make costly renovations, or sell their share while the other refuses. Whether the property is an inherited family home, an investment, or a residence purchased by an unmarried couple, disputes between co-owners can become deeply personal and legally complex.
At Peterson Law, LLP, we represent clients throughout California who are navigating the challenges of shared property ownership. Below, we explain your rights, your legal options, and how you can resolve disputes before they escalate into litigation.
Types of Co-Ownership in California and How They Affect Dispute Resolution
Before understanding your rights in a co-ownership dispute, it’s important to know how the property is legally held.
- Tenancy in Common (TIC): This is the most common form of co-ownership for unrelated parties. Each co-owner owns an undivided interest, which can be unequal, and can sell or transfer their share without the others’ consent. TIC does not include survivorship rights.
- Joint Tenancy: This includes the right of survivorship: when one co-owner dies, their interest passes automatically to the surviving joint tenant(s). This form is common among married couples or family members.
- Community Property: This applies to spouses or registered domestic partners in California. Property acquired during the marriage is presumed to be equally owned.
The type of co-ownership impacts how disputes are resolved, who has the right to use or improve the property, and what happens if one party wants to sell.
Common Disputes Between Co-Owners
Disagreements between co-owners are surprisingly common. Whether the property was inherited, purchased together, or held as an investment, disputes often arise when co-owners don’t see eye to eye on how the property should be used, improved, or disposed of.
1. One Owner Wants to Renovate or Improve the Property
Home improvements are one of the most frequent sources of friction. One co-owner may want to remodel the kitchen, add an accessory dwelling unit (ADU), or make landscaping upgrades to increase the property’s value or comfort. The other may see these efforts as unnecessary, disruptive, or too expensive.
These disputes raise several questions: Who decides whether improvements happen? Who pays? And what happens if one party contributes financially and the other does not? Even if improvements increase the home’s value, the owner who paid may struggle to recover costs without a written agreement.
2. One Owner Wants to Rent the Property
Renting the property, either short-term through platforms like Airbnb or long-term to a tenant, can create immediate conflict. One owner may see it as a smart way to generate income, while the other may worry about liability, wear and tear, or losing personal use of the home.
When there’s no written agreement, renting without unanimous consent can cause significant tension. Even if both parties agree to rent, disputes may arise over tenant selection, rental rates, how income is split, and who manages the property.
3. One Owner Wants to Sell but the Other Does Not
Perhaps the most emotionally and financially charged situation is when one co-owner wants to sell and the other refuses. This commonly occurs when one party needs to access equity, wants to exit the investment, or no longer wishes to share ownership.
Without a clear agreement or buyout mechanism, the owner who wants out may have no choice but to pursue a partition action: asking the court to force a sale and divide the proceeds. These cases are especially complex when improvements or unequal contributions to the property are involved.
Legal Rights and Responsibilities of Co-Owners
Under California law, co-owners generally have the following rights:
- Equal right to possession: Regardless of the ownership percentage, each owner has the right to use and occupy the entire property.
- Right to profits and obligations for expenses: Income generated by the property must be shared, and each owner must contribute to necessary expenses like taxes, insurance, and repairs.
- No automatic fiduciary duties: Co-owners are not obligated to act in the other’s best interests, but must deal fairly and in good faith.
These default rules apply unless otherwise agreed in writing. When disputes arise, courts look at the facts, not just the title.
Resolving Disputes Over Improvements
When one co-owner wants to improve the property, it can benefit the overall value. However, it can also lead to legal disputes, especially if the improvements are made without consent.
Can One Co-Owner Improve the Property Without Consent?
Yes, but they do so at their own financial risk. Under California law, one co-owner can make improvements to shared property without approval from the others. Still, the law does not require the others to contribute to the cost or compensate the improving party unless specific legal standards are met.
Even if the improvement adds significant value, the non-consenting co-owner isn’t automatically liable. Courts may consider these improvements when dividing proceeds in a sale or partition, but will typically only grant reimbursement if the improvement increased the fair market value and was reasonably necessary.
Reimbursement and Contribution Claims
To obtain reimbursement for an improvement, a co-owner generally must prove:
- The costs were reasonable and necessary to preserve or enhance the property.
- The improvement added measurable value, not just aesthetic benefit.
- The improvement wasn’t personal, such as installing a luxury pool or home theater for exclusive use.
If these elements are met, a court may order equitable reimbursement during a sale or partition. However, the process is often contentious, especially when documentation is lacking.
Improvements as Grounds for Partition
Unilateral improvements can signal a breakdown in the co-ownership relationship. If one party acts independently, especially after being told not to, it may justify a partition action (see discussion below).
In these cases, the court may order a sale of the property and award reimbursement for provable improvements before dividing the net proceeds.
Disputes Over Rental or Occupancy
Occupancy rights and rental decisions are another major flashpoint between co-owners, particularly when one wants to monetize the property and the other does not.
Can One Co-Owner Rent the Property Without Permission?
This question sits in a legal gray area. Technically, each co-owner has the right to lease their own undivided interest, but not the entire property. This often creates practical problems, as tenants typically want exclusive possession, which no single co-owner can legally guarantee without infringing on the other’s rights.
Suppose a co-owner rents out the property without consent. In that case, the other may challenge the lease, seek their share of the rental income, or pursue partition. Courts have broad discretion to cancel unauthorized leases or require the parties to split profits and expenses fairly.
Ouster and Exclusive Occupancy
If one co-owner excludes the other from using the property, either physically (by changing locks or removing belongings) or constructively (by renting it to someone else without permission), that may constitute ouster. Under California law, ouster entitles the excluded co-owner to seek:
- Re-entry, or legal access to the property
- Fair rental value, paid by the occupying owner
- Partition, to force a sale or division of ownership
However, just because one co-owner lives in the property alone does not mean an ouster has occurred. The excluded party must show that access was denied, not merely that they chose not to live there.
Disputes over occupancy often require careful legal analysis. One party’s desire to maintain exclusive use may conflict with the other’s equal right to possession, leading to claims of ouster, unjust enrichment, or partition.
Partition Actions as a Legal Solution
When co-owners reach a breaking point and informal negotiations fail, a partition action may be the only way to resolve a deadlock. Under California law, every co-owner has the right to seek a partition of jointly owned property. This legal remedy allows the court to divide or sell the property and allocate the proceeds, bringing finality to otherwise intractable disputes.
What Is a Partition Action?
A partition action is a lawsuit filed by a co-owner to force the division or sale of jointly owned real estate. The plaintiff doesn’t need the other owners’ consent and does not have to prove wrongdoing. They need to demonstrate that co-ownership exists and that continued joint ownership is no longer workable.
There are three types of partition in California:
- Partition by Sale: This is the most common outcome in residential property disputes. The court orders the property to be sold, and the proceeds are divided according to each party’s ownership interest, with adjustments for certain credits or reimbursements.
- Partition in Kind: In rare cases, the court may physically divide the property between owners. This is more common with large parcels of land or undeveloped property, but it is generally impractical for single-family homes or urban lots.
- Partition by Appraisal: When one party is willing to buy out the other, the court may appoint an appraiser to determine the property’s fair market value. The buyer pays the appraised amount, and the court supervises the transfer and distribution of funds.
Partition actions in California are governed by the California Code of Civil Procedure §§ 872.010–874.323. These statutes outline the process, from the initial complaint through judgment, and cover key issues such as cost allocation, appointment of referees, and accounting for improvements or rents.
When Partition May Be the Best Option
Partition becomes the most viable legal path when co-owners are deadlocked and no informal resolution appears possible. Common scenarios include:
- Irreconcilable Disagreements on Use, Sale, or Investment: Whether one party wants to renovate, rent, or cash out and the other does not, partition can cut through the impasse.
- Forcing a Resolution When One Owner Refuses to Cooperate: A partition lawsuit compels the court to intervene, even when a co-owner refuses to negotiate, sign listing agreements, or buy out the other’s interest.
- Accounting for Improvements or Unequal Contributions: Courts can consider financial contributions when distributing sale proceeds. If one co-owner paid for repairs, taxes, or upgrades, they may be entitled to reimbursement before the proceeds are split. However, the burden of proof lies with the party seeking compensation.
Although partition can be a powerful tool, it should be used thoughtfully. Filing suit will likely strain the relationship further and result in court oversight that neither party may fully control.
Costs, Timelines, and Risks of Partition
Partition actions can be expensive and time-consuming. Litigation costs may include:
- Attorney’s fees (sometimes recoverable from the property proceeds)
- Court filing fees
- Costs for a court-appointed referee to handle the sale or division
- Appraisal fees and expert witness testimony
- Accounting to sort out reimbursements and credits for expenses, rents, or improvements
Timelines vary, but a contested partition action may take six months to two years, depending on the court’s calendar, the complexity of the issues, and the parties’ willingness to settle.
There’s also a risk of financial loss. Forced sales can yield lower-than-market values, especially if the parties are uncooperative or sabotage the listing process. If the dispute is acrimonious, buyers may be wary of purchasing the property, further depressing its value.
Despite these challenges, many partition cases settle before trial. A partition filing often motivates reluctant co-owners to engage in meaningful negotiations, whether through direct talks or mediation.
Alternative Dispute Resolution (ADR) Options
Before going to court, co-owners should consider alternative dispute resolution (ADR) methods. These approaches can resolve conflicts more efficiently, privately, and cost-effectively than litigation.
Mediation
Mediation involves a neutral third party who helps the co-owners negotiate a mutually acceptable resolution. Unlike a judge, a mediator has no power to impose a decision. The process is confidential and collaborative.
In a property co-ownership dispute, mediation may help the parties:
- Agree on a buyout price
- Decide how to share costs or rental income
- Determine how improvements should be handled
- Create a schedule for sale or occupancy
Mediation can occur before or during a partition action and often leads to creative, personalized outcomes that the court cannot provide.
Arbitration
Arbitration is a more formal ADR process in which a neutral arbitrator hears evidence and issues a binding or non-binding decision. While faster than litigation, arbitration is generally only available if the parties have agreed to it in a co-ownership agreement or have signed an agreement to arbitrate after the dispute arises.
Binding arbitration can be especially useful in cases involving:
- Valuation disputes
- Rent-sharing disagreements
- Claims for improvement reimbursement
Collaborative Agreements and Pre-Litigation Settlement Efforts
Sometimes, co-owners are willing to negotiate directly but need legal guidance to structure a fair exit. Pre-litigation settlement efforts may include:
- Buyout agreements with or without appraisal
- Sale agreements with predetermined listing strategies and broker selection
- Cost-sharing contracts for repairs, improvements, or taxes
These agreements should always be put in writing and, ideally, recorded to avoid future misunderstandings.
Modifying Ownership Structure
When parties wish to maintain co-ownership but reduce conflict, restructuring may help. Options include:
- Quitclaiming one party’s interest into a separate legal entity (such as an LLC)
- Creating a co-ownership agreement that defines use, improvements, rental decisions, and exit strategies
- Designating one party as the managing owner for specific decisions, with limitations and oversight
While these strategies don’t work for all situations, they offer a middle ground for co-owners seeking to preserve their relationship or investment without going to court.
At Peterson Law, LLP, we guide clients through all stages of co-ownership disputes, from exploring ADR to litigating partition actions when necessary. Our goal is to protect your property interest and help you move forward with clarity and control.
How Peterson Law, LLP Helps Co-Owners in Conflict
Peterson Law, LLP has deep experience in real estate disputes involving co-ownership. We help clients:
- Understand their rights and obligations under California law
- Evaluate their options: improvement reimbursement, partition, or negotiated agreement
- Represent clients in partition actions or settlement negotiations
- Protect their financial investment and personal interests in the property
We approach each case strategically, with the goal of avoiding unnecessary litigation, but prepared to litigate when necessary.
FAQs About Co-Owner Property Disputes in California
Can a co-owner be forced to pay for upgrades they didn’t approve?
Not usually, unless the improvement was necessary or significantly increased the property’s value. A court may order partial reimbursement during a partition.
What if my co-owner rented out the home without telling me?
You may be entitled to a share of the rental income or have the lease canceled. It may also justify a partition action.
Can I stop my co-owner from making changes to the house?
If the changes are substantial or affect your use of the property, you may be able to get a court injunction. Minor upgrades are harder to block.
How long does a partition action take in California?
Timelines vary, but partition actions can take 6 to 18 months, depending on complexity, court backlog, and whether parties settle early.
Do I have to go to court, or can we settle out of court?
You can and should attempt to settle first. But if the other co-owner refuses to cooperate, court may be your only option.
Take Control of Your Co-Ownership Conflict
Shared property ownership is a legal and financial partnership. When it stops working, it’s critical to act quickly, understand your rights, and take the appropriate legal steps. Whether you’re trying to get reimbursed for improvements, resolve a rental conflict, or pursue a partition sale, experienced legal counsel can make all the difference.Peterson Law, LLP is here to guide you through every stage of your co-ownership dispute. Contact us today to schedule a consultation and explore your legal options.
