Say your lease is solid. Then a tenant asks for a dog, two cars in a one-space driveway, or a different split on the electric bill. The base lease says nothing about any of it. Even a good lease, like the kind we cover in our guide to lease agreements for landlords, can’t predict every situation at every property.
That’s what an addendum is for. If you own a rental in Oklahoma, whether it’s your first house or your fifth door, this post covers how to write one, how to get it signed, and what to put in the four addenda we see most: pets, parking, utilities, and smoking.
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In This Guide
What a lease addendum does
An addendum is a separate signed page that attaches to the lease and adds rules on one topic. The lease is the foundation. The addendum covers the details that belong to one property or one tenant.
Why not stuff everything into the lease? Because one-topic pages are easier to update and easier to point to when someone disagrees. “Page two, paragraph four” ends an argument faster than “somewhere in the lease.”
A generic lease also can’t know your parking layout, your meter setup, or whether the carpet is two years old. Here’s how the four common addenda compare:
| Addendum | What it should spell out | Common money line |
|---|---|---|
| Pet | Animal type, number, approval terms, damage terms | Non-refundable fee, often $500 or more |
| Parking | Assigned spaces, guest rules, unauthorized vehicles | $50 to $150 a month for reserved or covered spots |
| Utilities | Who pays which utility, whose name is on each account | Depends on the property |
| Smoking | What counts as smoking, where it’s banned, cleanup terms | Tenant agrees to cover damage |
Those dollar ranges are typical for this market, not rules. Oklahoma City has no citywide rent control, so owners have room to set their own terms. Use that room carefully.
How to add an addendum, step by step
The process is the same for all four.
- Decide before move-in when you can. It’s far easier to add an addendum at signing than to bolt one on later.
- Cover one topic per page. A pet addendum that also covers parking and trash is a mess to enforce.
- Identify the lease. Put the property address, tenant names, owner or manager name, and lease dates on the addendum.
- Write plain rules with real numbers. Name the dollar amounts, the due dates, and the exact areas covered.
- Get every adult tenant to sign and date it. Add the owner or manager signature too.
- Hand the tenant a copy. Keep the original with the lease.
- Store it where you can find it in two minutes. A signed page you can’t locate doesn’t help you in a dispute.
Skip step 5 and the rest is decoration.
The pet addendum
Pets cause more addendum questions than anything else. A no-pets lease with a verbal “okay, keep the dog” is the classic setup for trouble.
Picture an owner who does exactly that. The dog tears up the carpet. The owner has no signed record of the approved pet, the fee, or who owes what for damage. That owner has very little footing to deduct anything.
What to put in it
- Animal details: type, breed, weight, and age.
- Number of pets: a hard cap, in writing.
- Approval terms: what happens if the tenant adds a second pet without asking.
- Money terms: any fee, deposit, or monthly pet rent, labeled correctly.
- Damage terms: the tenant pays for damage the pet causes, beyond normal wear.
Fee versus deposit
Label these honestly. A refundable pet deposit is a deposit under Oklahoma law, so it gets the same treatment as any other security deposit. A non-refundable pet fee is a different thing, and the page should say so in plain words.
A pet deposit has to sit in an escrow account at a federally insured institution in Oklahoma, not in your operating account. Misusing deposit money is a crime under 41 O.S. § 115(A), with up to 6 months in county jail and a fine of up to twice the amount taken.
We lean toward the non-refundable fee. Tenants push back hard on big refundable deposits, and deposit fights at move-out are a top source of landlord-tenant conflict. A reasonable fee plus clear approval terms tells everyone where they stand on day one. We also don’t know of a cap in § 115, but check the current statute before setting amounts.
At Weston, if an approved pet causes damage, we handle the repair costs at no extra charge to the owner. For carpet, we call Watson & Sons, LLC.
One more rule. Service and emotional support animals are not pets. Don’t run them through a pet addendum or charge pet fees or pet rent. Oklahoma has a separate statute on assistance animals, and the Fair Housing Act applies.
The parking addendum
Parking sounds minor until it isn’t.
Picture a multi-unit owner with limited spots and no parking addendum. Tenants start doubling up, then taking each other’s spaces. Before long somebody is typing landlord harassment Oklahoma into a search bar, and the owner has no written policy to point to.
Parking matters even more in two kinds of local rentals:
- Student housing near OU and OCU: shared lots and high turnover mean a lot of new faces every August.
- Military tenants tied to Tinker Air Force Base: work trucks, second vehicles, and trailers are common, and tenants often want clear rules up front.
A good parking addendum names these items:
- Which space belongs to which unit
- How many vehicles each unit gets
- Where guests park
- Whether trailers, boats, and inoperable vehicles are allowed
- What the owner can do about vehicles in the wrong spot
- Any monthly fee for reserved or covered parking, typically $50 to $150
Check the OKC Municipal Code before writing towing language. We haven’t verified what local rules apply.
The utility addendum
Oklahoma summers run hot from June through August, and a big electric bill makes tenants angry fast. Settle who pays what before the first July bill.
Say an owner switches a property to “tenant pays utilities” in the middle of a lease with nothing signed. The tenant points to the original lease. The owner has no document backing the change, and an unpaid balance turns into a dispute. A tenant who feels blindsided starts looking up Oklahoma tenant rights to withhold rent, and then you have two problems.
List each utility on its own line:
- Electric: tenant or owner, and whose name is on the account.
- Gas and water or sewer: same question.
- Trash: often forgotten.
- Internet and cable: usually the tenant, but say so.
- Transfer date: when the account goes into the tenant’s name.
If you plan to split or bill back a shared meter, have a lawyer read that language first. We can’t confirm what Oklahoma allows for utility billing arrangements.
The smoking addendum
Owners assume “no smoking on premises” in the lease covers them. It rarely does in practice. A one-line clause leaves too many questions open.
A real smoking addendum answers them:
- What counts: cigarettes, cigars, vaping, and marijuana in any form.
- Where it’s banned: inside the unit, on balconies and patios, near entrances, or all of it.
- What happens on a violation: the tenant agrees that smoking breaks the lease.
- Cleanup terms: the tenant agrees to cover damage the smoking causes.
That last point matters at move-out. Under 41 O.S. § 115(B), you can use the deposit only for unpaid rent and damages caused by the tenant breaking the Act or the lease. If your smoking rule lives in a signed addendum, the damage ties back to a lease violation you can document. For wall repair and repainting after smoke damage, we call Clean Paint Repair LLC.
A vague rule is hard to enforce. A signed addendum that defines the behavior, the area, and the cleanup terms gives you something to point to at move-out.
Adding an addendum mid-lease or at renewal
Can you add a new rule in the middle of a lease just by sending notice? We can’t confirm that, and we wouldn’t bet on it. The Act has a section on landlord rules and regulations (§ 126), and the limits there aren’t something to guess at. Get the tenant’s signature.
If a tenant won’t sign, you may have to wait until renewal. Either way, don’t act like the rule is in force.
Renewal is the other trap. An owner who added a parking addendum in Year 1 and didn’t reattach it to the renewal may find it hard to enforce in Year 2. At every renewal:
- Re-sign any addenda that still apply.
- Update amounts and names.
- Remove any addendum for a pet that has moved out.
Other addenda Oklahoma owners shouldn’t skip
Pets, parking, utilities, and smoking get the attention. A few other pages deserve it too.
- Flooding disclosure: Oklahoma has a statute on disclosing flooding within the past 5 years in written rental agreements (41 O.S. § 113a). Don’t leave it out.
- Assistance animals: these fall under 41 O.S. § 113.2 and the Fair Housing Act, not your pet rules.
- Mold: owners ask about the Oklahoma landlord tenant act mold language more than you’d think. Read the Act itself, since we aren’t summarizing mold rules here.
- Lead-based paint: older properties may trigger a federal disclosure. Check the current federal rule.
Fair Housing mistakes get expensive. Civil penalties for a first violation can run into the tens of thousands of dollars per violation, and federal agencies adjust those amounts for inflation every year. A pet addendum applied to a tenant’s assistance animal is exactly the kind of error that triggers one.
How we keep addenda organized
Paper addenda get lost. We use Buildium, which lets us store signed addenda, attach them to the tenant record, and pull them up in seconds. Darby Buchanan, our admin and office manager, handles a lot of that paperwork. Kaira Streeter, our leasing agent, walks applicants through the pet, parking, and smoking pages before anyone signs.
We manage 135 properties, and we’ve been in business for 15 years. That covers single-family homes, multi-family, townhomes and condos, student housing, Section 8 and HUD, and HOA properties. Each one has its own quirks, which is why we don’t hand every tenant the same stack of pages.
Documentation matters most to owners who aren’t nearby. One out-of-state owner with six rentals here wrote in a review that our manager “follows up on every question or concern.” When you live 1,500 miles away, that’s the whole point. You can’t walk the property, so the paperwork has to speak for you.
Tenants notice the same thing. Another reviewer wrote that when their bank double-paid their rent, the mistake was corrected in minutes. If you read through property management Oklahoma City Oklahoma reviews for us, that kind of fast fix comes up a lot.
If a tenant ever lands in an eviction case, they may look for Legal Aid OKC eviction help. Whoever helps them will want to see the signed paperwork, and so will a judge.
When to bring in an attorney
An addendum template is a starting point. Once, early on, have a landlord tenant attorney OKC investors already use look over yours. Some firms offer a landlord tenant lawyer free consultation, so ask before you assume it costs anything.
Get a lawyer’s eyes on the page when:
- You want to bill back a shared meter.
- A tenant is refusing to sign a new addendum mid-lease.
- You’re drafting language for assistance animals or disability-related requests.
- Your property is old enough to raise lead-paint disclosure questions.
Tenants who look up how to report a landlord in Oklahoma are usually already frustrated. A clear, signed addendum keeps you from becoming the landlord in that search. The landlord tenant act Oklahoma owners work under gives you a lot of flexibility, but it expects you to write your terms down.
If addendum paperwork feels harder than it should, or you have rental property owner questions in Oklahoma City, Oklahoma, we’re open to a conversation, and the first one is free.
FAQ
Do all tenants have to sign a lease addendum?
Every adult on the lease should sign and date it, and so should the owner or manager. An addendum signed by only one of two tenants leaves you with an argument about the other.
Can I charge a pet deposit and a pet fee at the same time?
You can use both if your pet addendum labels each one clearly. A refundable deposit goes into an Oklahoma escrow account at a federally insured institution, and a non-refundable fee is a separate charge. We don’t see a cap in the statute, but check the current rule before setting amounts.
How long do I have to return a deposit collected under an addendum?
It follows the same clock as any other deposit. The balance is due within 45 days after the tenancy ends, the tenant gives up possession, and the tenant makes a written demand. You send a written list of any deductions, either in person or by return-receipt mail.
Can I charge pet rent for a service or emotional support animal?
No, don’t treat assistance animals as pets. Oklahoma has a separate statute on them (41 O.S. § 113.2), and the Fair Housing Act applies. Pet fees and pet rent don’t belong on those tenants.
What should I do with addenda when a lease renews?
Re-sign any that still apply, update the amounts and names, and drop ones that no longer fit. Don’t assume an old addendum carries over without checking.
