Contra Costa County, California
If your roommate owes you money in Contra Costa County
Updated August 2026 · California small claims and roommate dispute basics
Can I sue my roommate in small claims court in Contra Costa County?
Usually, yes. If your roommate owes you for unpaid rent, took your property, damaged shared items, or kept your share of a deposit, small claims court is often the simplest way to ask for money.
For most people, the key questions are: what exactly your roommate agreed to pay, what you can prove, and whether your claim fits within the usual small claims limit for individuals, which is $12,500. In Contra Costa County, small claims cases are heard in Martinez, Pittsburg, and Richmond, so where you file and where you later appear may depend on where your roommate lives, where the rental was, or where the problem happened.
This page is about disputes with a roommate, not with the landlord. That matters because your rights often come from your agreement with the roommate, your text messages, how bills were actually split, and who paid what. The court generally will not fix a vague unfairness problem unless you can turn it into a clear money claim.
What can I recover from a roommate?
You can usually ask for money your roommate should have paid or should return to you. Common examples are unpaid rent, utilities, your share of a security deposit they kept, and the value of property they took or damaged.
Think in categories. The more specific you are, the easier your claim is to understand.
- Unpaid share of rent if you covered more than your agreed portion
- Unpaid utilities, internet, or other shared household bills
- Your share of a security deposit if one roommate got the refund and did not divide it fairly
- Value of furniture, electronics, kitchen items, or other belongings a roommate took and did not return
- Repair costs if a roommate damaged jointly owned property
What you usually cannot recover is just stress, annoyance, or a bad living situation by itself. You need a money loss you can explain and back up with proof.
Deposit fights are different when the dispute is with a roommate
If the landlord returned a security deposit to one roommate, the next issue is how that money should have been split between the people living there. California generally requires landlords to return or account for a residential security deposit within 21 calendar days after move-out, but a fight between roommates is separate: the court will usually focus on who paid the deposit, what everyone agreed to, and whether deductions were real and shared fairly.
If you paid the roommate directly when you moved in, gather proof of that payment. If the landlord sent the deposit refund to your former roommate, try to get the itemized deductions, any move-out statement, and proof of the refund amount.
Do I need to send a demand letter before filing?
Yes, in most small claims cases you should first clearly ask your roommate to pay or return the property before you file. California requires a demand before filing under Code of Civil Procedure § 116.320.
A demand letter does not need legal language. It should say what happened, what amount you want, why you believe they owe it, and a short deadline for them to respond. Keep the tone calm. If you are asking for property back, name the items and say you will accept return of the items instead of money if that solves the problem.
- List the exact amount or items you want back.
- Attach or mention your proof: payment apps, lease, roommate agreement, photos, receipts, or texts.
- Say how they can pay you or arrange return of the items.
- Keep a copy of the letter and proof you sent it.
Sometimes a clear demand letter is enough. If you want help organizing the facts and sending a firm written demand, mediation or a service like Judicaid can be one option before court, especially when you still want a practical settlement.
What proof do I need to win a roommate money claim?
Bring proof of the agreement, proof you paid more than your share or lost property, and proof your roommate did not fix it after you asked. Small claims judges usually care more about simple, organized evidence than long arguments.
- The lease, if both of you signed it
- Any separate roommate agreement, even if it was just by text
- Screenshots showing how rent or bills were supposed to be split
- Bank records, Venmo, Zelle, checks, or receipts showing what you paid
- Photos of the property before move-out and after
- A list of items taken, with estimated value and proof they were yours
- Messages where your roommate admits owing money or having the items
- The landlord's deposit accounting, if the dispute involves the security deposit
If your agreement was never written down, the court may still consider what the two of you actually did month after month. Regular payments in the same pattern can help show the deal.
Where do I file a small claims case in Contra Costa County?
Contra Costa small claims matters are heard in Martinez, Pittsburg, and Richmond. The right location often depends on where your roommate lives, where the rental unit was, or where the agreement was supposed to be performed.
That local setup matters if you are in Concord, Richmond, Antioch, Walnut Creek, Pittsburg, Martinez, San Ramon, or Brentwood, because the county does not hear small claims in every city. Before you go in person, it is smart to confirm filing and hearing logistics with the court at (925) 608-1000. Clerk window hours are 8:00 a.m. to 4:00 p.m., with most clerks answering phones from 8:00 a.m. to 3:00 p.m., which can matter if you are trying to file around work or school.
Two of the county locations people commonly look for are 725 Court Street, Martinez, CA 94553 and 1000 Center Drive, Pittsburg, CA 94565. If your dispute connects more naturally to Richmond, that may be the most practical hearing location, but confirm with the court because filing venue can depend on the facts of your case.
How long do I have to sue a roommate?
It depends on the kind of claim, but do not wait. For an oral agreement, California generally gives you 2 years to sue.
Different deadlines can apply depending on whether the case is about a spoken agreement, written agreement, property damage, or conversion, which is the legal term for someone wrongfully taking or keeping property. If you are close to a deadline, act quickly and get tailored help.
Should I try to settle with my roommate before court?
Usually yes. Roommate cases are often about messy facts, shared blame, and records spread across phones and payment apps, so settlement can save time and stress.
| Option | When it fits | Possible downside |
|---|---|---|
| Direct demand letter | You have a clear amount, clear proof, and think your roommate may pay if asked firmly | They ignore you or argue without offering anything real |
| Mediation | You want a practical deal about money, payment plans, or return of property | No guaranteed agreement |
| Judicaid | You want help structuring a dispute, making a settlement ask, and keeping the process moving for a flat fee of $34.99 | It is still a negotiation tool, not a court order |
| Small claims court | You need a judge to decide whether money is owed | You must prepare evidence, attend, and then collect if you win |
| Walking away | The amount is small, proof is weak, or continuing the fight will cost you more energy than it is worth | You may recover nothing |
Settlement does not mean you were wrong. It means you are deciding whether a sure, workable result now is better than a hearing later.
What if my roommate took my stuff instead of just owing money?
You can usually ask for the property back or for its reasonable value if it is gone. Be specific about what was taken, when, and why it belonged to you.
Make a simple item list with the best proof you have: purchase receipts, photos of the item in your room, serial numbers, messages about ownership, or witnesses who saw it there. Use fair values, not replacement-at-new prices unless that truly fits.
If the property is still being held, your demand letter can say you will accept return of the listed items by a certain date. If you would rather be paid than keep dealing with your former roommate, state the amount you believe each item is worth.
What if only one of us was on the lease?
You may still have a claim. A roommate dispute does not disappear just because the landlord only dealt with one person.
If you paid rent to the roommate on the lease, that payment history may help prove an agreement between the two of you. The same is true if your former roommate promised to return part of the deposit, split utilities, or hold belongings for you after move-out.
But the facts matter. If there was never a clear agreement, or if you cannot show how the amount was calculated, the case gets harder. Focus on what can be proved, not everything that felt unfair.
What should I do this week if I want my money back?
Start by organizing the story into a short timeline and gathering your proof. Then send a written demand and decide whether settlement, mediation, or small claims is the better next step.
- Write a timeline: move-in, payments, move-out, deposit return, missing items, and your requests for payment.
- Add up only the amounts you can explain and prove.
- Collect screenshots, receipts, lease pages, and photos in one folder.
- Send a calm written demand.
- If there is no real response, consider filing in Contra Costa County at the appropriate small claims location.
If you are preparing to file, double-check local logistics with the Contra Costa County Superior Court at (925) 608-1000 during 8:00 a.m. to 4:00 p.m., with most clerks answering phones from 8:00 a.m. to 3:00 p.m.. Because small claims hearings in this county are heard in Martinez, Pittsburg, and Richmond, planning ahead can save you a wasted trip.
Frequently asked questions
Can I ask for my share of the security deposit if the landlord sent it to my roommate?
Usually yes. If your roommate received the refund and kept money that should have been shared, your claim is usually against the roommate, not the landlord. The court will often want to see proof that you paid into the deposit and any landlord accounting issued after move-out.
What if we never had a written roommate agreement?
You can still have a case. Texts, regular payment patterns, and messages about splitting rent or utilities can help show the agreement, and an oral agreement may still be enforceable, with a general deadline of 2 years to sue.
Do I have to go to Martinez to file my case?
Not always. In Contra Costa County, small claims cases are heard in Martinez, Pittsburg, and Richmond, so the proper location depends on the facts. You can check practical filing questions with the court at (925) 608-1000 during 8:00 a.m. to 4:00 p.m., with most clerks answering phones from 8:00 a.m. to 3:00 p.m..
Can I sue for emotional distress because my roommate made my life miserable?
Usually not in a straightforward roommate money dispute unless there are unusual facts and a recognized legal basis. Small claims works best for concrete losses like unpaid rent, utilities, deposit money, or the value of property taken or damaged.
What if my roommate says the deposit was used for damage?
Then the details matter. Ask for the landlord's itemized deductions and compare them with the move-out condition, photos, and who actually caused the problem. A judge may look at whether the deductions were real and whether your roommate split them fairly.
Is sending a demand letter really necessary?
In most small claims matters, yes. California requires a demand before filing under Code of Civil Procedure § 116.320, and even when it does not fully resolve the dispute, it helps show the court that you clearly asked for payment first.
This guide is general information, not legal advice, and Judicaid is not a law firm. Court fees, dollar limits, and procedures change — always verify current details with the Contra Costa County Superior Court (cc-courts.org) or a licensed California attorney before acting.