New Landlord? The Lease Mistakes That Cost the Most

Becoming a landlord for the first time is a crash course in property management, tenant relations, and — whether you expected it or not — landlord-tenant law. Most new landlords focus on finding good tenants and keeping the property maintained. Few spend enough time on the document that governs the entire relationship: the lease.

The lease is the foundation of every landlord-tenant interaction. When it is well-drafted and compliant with your state's law, it provides clarity and protection for both parties. When it is not, it may create liabilities, unenforceable provisions, and expensive surprises.

Here are the most common lease mistakes new landlords make — and what they tend to cost.

Mistake 1: Using a Template From the Wrong State

This is the single most common mistake, and it is understandable. You search "residential lease template," download something that looks professional, and start filling it in. The problem is that landlord-tenant law is state-specific, and in many cases, city-specific.

A lease template written for Texas — which has relatively few statutory tenant protections — may include provisions that directly conflict with California law, which has extensive protections around deposits, entry notice, rent increases, and termination.

The clauses that vary most by state include:

• Security deposit caps and handling requirements. Caps range from one month's rent to no cap at all, and return deadlines range from 14 to 60 days depending on the state.
• Late fee limits. Some states cap late fees; others do not. Some require grace periods; others do not.
• Entry notice requirements. Most states require 24 to 48 hours' notice. Some specify permissible hours.
• Termination and eviction procedures. Notice periods, cure rights, and just-cause requirements vary significantly.

What this costs: Using a non-compliant template may result in unenforceable clauses, statutory penalties (some states impose two to three times damages for deposit violations), and weakened legal standing in any dispute.

Mistake 2: Not Updating the Lease for Law Changes

Even if your lease was compliant when you first drafted it, landlord-tenant law changes frequently. States and cities regularly update deposit rules, notice requirements, rent control provisions, and required disclosures.

For example, California changed its security deposit cap in 2024, limiting deposits to two months' rent for most units. Oregon and Washington have enacted rent increase caps in recent years. Multiple cities have added or expanded just-cause eviction protections.

A lease that was perfectly compliant three years ago may contain provisions that now conflict with current law.

What this costs: Outdated provisions may be unenforceable. If you rely on a clause that was valid when the lease was signed but has since been superseded by statute, a court may apply the current statute rather than the lease language. Some tenants find it helpful to review their lease annually against current law — and landlords may want to consider doing the same.

Mistake 3: Collecting a Security Deposit Above the Cap

New landlords sometimes set high security deposits to protect against damage, especially when renting to tenants with limited rental history. The instinct makes sense, but many states cap how much you may collect — and the penalties for exceeding the cap can be steep.

In New York, the cap is one month's rent. In California, it is two months' rent for unfurnished units. In Massachusetts, it is the first month's rent. Collecting above the cap — even by a small amount — may expose the landlord to statutory penalties.

Some states impose penalties of two to three times the excess amount. Others allow the tenant to recover the entire deposit plus attorney fees if the landlord did not comply with deposit handling requirements. In eviction proceedings, a non-compliant deposit may create a defense or counterclaim that complicates the case.

What this costs: Penalties for deposit overcharges can easily exceed the amount of the deposit itself. A $500 overcharge in a state with treble damages exposure may result in $1,500 in liability plus legal fees.

Mistake 4: Including Clauses That May Not Be Enforceable

Many new landlords want their lease to be as protective as possible, so they include broad clauses — blanket liability waivers, habitability disclaimers, unrestricted entry rights, automatic forfeiture of deposits. These clauses may feel protective, but if they conflict with state law, they are generally unenforceable.

The problem is not just that the clause fails. In some cases, including an unenforceable clause may:

• Undermine credibility in court. A judge who sees multiple unenforceable provisions may view the entire lease with skepticism.
• Create affirmative defenses. A tenant facing eviction may argue that the lease is unconscionable or that the landlord acted in bad faith.
• Signal awareness of risk. A habitability waiver, for example, may suggest the landlord knew the property had habitability issues and attempted to contract around them.

What this costs: The cost is indirect but potentially significant. Unenforceable clauses do not protect you, and they may actively harm your position in legal proceedings.

Mistake 5: Missing Required Disclosures

Federal law requires a lead paint disclosure for any property built before 1978. Beyond that, disclosure requirements vary by state and locality — and new landlords frequently miss them.

Common required disclosures include:

• Lead paint disclosure (federal — all pre-1978 properties)
• Mold history (required in California, Indiana, and others)
• Bed bug history (required in several states and municipalities)
• Flood zone information (required in some states)
• Registered sex offender notice (required in some states)
• Move-in inspection checklist (required in some states for deposit retention)
• Landlord identity and contact information (required in many states)

Missing a required disclosure may have consequences beyond a fine. In some states, a landlord who fails to provide required disclosures may lose the right to retain any portion of the security deposit, regardless of actual damage to the unit.

What this costs: The specific penalty depends on the disclosure and the state. Lead paint violations can result in federal penalties. Missing a move-in checklist may mean forfeiting your right to make deductions from the deposit — even if the tenant caused thousands of dollars in damage.

Mistake 6: Not Knowing Local Ordinances

State law sets the baseline, but many cities and counties have their own landlord-tenant ordinances that impose additional requirements. New landlords who focus only on state law may miss local rules that apply to their property.

Examples of local ordinances that may apply:

• Rent control or rent stabilization (applicable in parts of California, New York, Oregon, Washington, and the District of Columbia, among others)
• Just-cause eviction requirements (many cities have adopted these independently of state law)
• Rental registration or licensing (some cities require landlords to register rental properties)
• Additional disclosure requirements (some cities require disclosures about tenant rights, rent history, or building conditions)
• Relocation assistance requirements (some cities require landlords to pay relocation costs in certain no-fault eviction scenarios)

What this costs: Non-compliance with local ordinances may result in fines, inability to pursue eviction, or affirmative claims by the tenant. Some ordinances include substantial penalties — multiple months' rent in some cases — for landlords who fail to comply.

A Better Starting Point

Every one of these mistakes is avoidable. The common thread is that new landlords often do not know what they do not know — they assume their lease is fine because it looks professional or because they downloaded it from a reputable source.

The reality is that compliance depends on your specific state and city. A lease that is perfectly compliant in one jurisdiction may contain multiple problematic provisions in another.

A few steps that many landlords find helpful:

1. Research your state's landlord-tenant statute before choosing a template.
2. Check for local ordinances in your city or county.
3. Review your lease annually against current law, since statutes change.
4. Get a second opinion on your lease from someone — or something — that knows your state's specific requirements.

Run Your Lease Through FlagMyLease

FlagMyLease analyzes lease agreements clause by clause against state-specific law. Upload your lease template, select your state, and get a detailed report identifying provisions that may conflict with your jurisdiction's statutory framework — before your first tenant signs it.

Run your lease through FlagMyLease before your first tenant signs it.