There are contracts that seem simple because they happen every day. A house, rent, a key, and the promise that each party will do their part. However, in rental agreements, "simple" is often the first step towards costly conflicts when the contract is poorly written, when essential clauses are missing, or when the obligations of landlord and tenant are understood differently.

A lease agreement is not just for "formality." It serves to prevent disputes regarding renovations, rent, deadlines, security deposits, value updates, rules for using the property, visits, termination, renewal, and, in the most serious cases, eviction.

In this article we explain the most important clauses, the landlord's obligations and the tenant's obligations, and how to act when the first sign of non-compliance appears.

What is a lease agreement?

A lease agreement is an agreement by which the landlord grants the tenant the temporary use of a property, in exchange for rent.

This seems basic, but notice what's hidden in the word "gozo" (enjoyment/pleasure): it's not just about "living." It's about using, enjoying, and inhabiting within the legal rules and what was agreed upon in the contract. And this is where the fractures arise.

When a contract is incomplete, two things happen.

First, each party begins to fill the void with what it "thinks" is normal.

Then, when conflict arises, the solution is no longer a conversation. It involves evidence, deadlines, and sometimes, the courts.

Written contract vs. verbal contract: the risk of thinking that "everything is settled"“

In Portugal, informal agreements still exist. The problem is that what isn't written down is harder to prove, and this weakens both the landlord and the tenant.

If this is your reality, it's worth reading. Verbal lease agreement: is it valid?, Because many conflicts start precisely there: no one can clearly prove the deadline, the agreed income, the expenses included, or the termination rules.

The essential clauses in a lease agreement.

There are clauses that are not "extras." They are the core of the contract. And when they fail, the lease becomes vulnerable.

Below is a map of the essential clauses and what should be clear in each one.

Identification of the parties and the property

The contract must identify the landlord and tenant with complete details and accurately describe the property.

Mistakes here may seem small, but they can complicate notifications, procedures, and evidence.

Deadline, renewal and termination

The contract term and how it is renewed (or not renewed) must be clear.

It should also be clear:

• • whether the contract is for a fixed term or indefinite duration;
  • How to file a complaint from each of the parties;
  • How far in advance should it be communicated?;
  • For what address or contact information?.

Many disputes arise because communication was late, sent to the wrong address, or done through a means that leaves no proof.

Rent amount, payment date, and payment method.

The contract should state:

• • income value;
  • payment deadline;
  • Payment method (transfer, reference, other);
  • The consequence of the delay and whether there is a clause for interest or compensation within legal limits.

When there are recurring delays, the lack of contractual discipline becomes a cash flow problem for the landlord and a risk of eviction for the tenant. To understand the path forward when payment is missed, see [link/reference]. Tenant not paying rent: legal steps for the landlord.

Security deposit and guarantees

Security deposits are one of the issues that creates the most friction at the end of a contract. Simply saying "there's a security deposit" isn't enough. It's necessary to define it:

• • value;
  • purpose (damages, lost income, expenses);
  • when and how it is returned;
  • What type of proof is needed to retain assets?.

A rule of thumb: a security deposit without any return criteria is an invitation to dispute.

Expenses and charges: water, electricity, condominium fees, and others.

It is essential to clarify what the tenant pays and what the landlord pays.

In everyday life, it's normal for the tenant to cover utilities and the landlord to cover structural costs. But there are hybrid cases, and it's better to address this issue in the contract than to have it discussed later.

Property status and inventory

A well-executed inventory reduces conflicts in 80%.

It doesn't have to be complex. It has to be precise.

A good inventory includes:

• • description of the general condition;
  • List of equipment (e.g., water heater, oven, appliances);
  • photographs with date;
  • Initial meter reading, when applicable.

Without an inventory, the end of the lease turns into a battle over what was already damaged and what was damaged during the process.

Construction, repairs and maintenance

This is a critical point.

The contract should specify how to request repairs, how long it takes for the landlord to respond, and in what situations the tenant can proceed with urgent repairs.

To explore this topic further, see Works on the Rented Property: Who Decides and Who Pays?.

Rules for use, visits and subletting

When the lease is going well, these clauses seem irrelevant. When it's going badly, they become crucial.

It is important to clarify:

• • whether or not the tenant can sublet;
  • It is possible to accommodate third parties for extended periods;
  • Rules regarding animals, noise, and the use of common areas;
  • Conditions under which the landlord can visit (with notice, how far in advance, at what times).

The absence of these rules fuels conflicts of privacy and trust.

Landlord's obligations: what must they guarantee and what can't they demand?

The landlord is not just "the one who receives the rent." They have legal and contractual duties.

In practical terms, the landlord's obligations usually include:

• to deliver the property in habitable and usable condition;
• to ensure that the tenant can use the house peacefully, without undue interference;
• To carry out necessary works and repairs to maintain the property in good condition, when the responsibility does not lie with the tenant;
• Respect communication rules and deadlines when you intend to cancel or not renew;
• Issue receipts when applicable and fulfill tax obligations associated with the lease.

A common mistake is for the landlord to "enter" the property without notice, feeling like the owner. Being the owner does not give the right to violate the tenant's peaceful use.

Tenant obligations: what they must do to avoid litigation.

From the tenant's perspective, the most obvious obligation is to pay the rent. But it's not the only one.

In practice, the tenant's obligations include:

• pay the rent on time;
• Use the property prudently, without damaging it;
• Inform the landlord of relevant situations (e.g., leaks, serious damage);
• Do not carry out any work without authorization, except in cases of legally justifiable urgency;
• respect condominium and neighborhood rules;
• Return the property at the end of the contract in its proper condition, taking into account normal wear and tear.

When non-compliance begins, it usually starts small: a delay here, a postponed repair there. If the problem isn't dealt with early, it escalates.

Rent arrears: what to do before eviction?

When rent is overdue, the worst mistake is silence.

From the landlord's perspective, letting things accumulate for months without notification means losing control.

From the tenant's perspective, hiding means losing room to negotiate and organize.

In practical terms, the safest path involves:

• Formalize the delay in writing and request regularization;
• Keep proof of communications;
• assess whether there is room for a payment agreement;
• When necessary, proceed to the appropriate legal mechanisms.

For a complete guide from the landlord's side, see Tenant not paying rent: legal steps for the landlord.

Eviction process: when does it happen and how to prepare?

Eviction is the most feared consequence in a tenancy dispute. But it doesn't begin in court. It almost always begins with non-compliance and poor communication.

When the situation reaches the point of requiring property recovery, it's important to understand the procedures and requirements. For this, see... Landlord wants to evict: how does the eviction process work?.

The detail that determines the success of the process is often simple:

• valid contract;
• proof of non-compliance;
• correct notifications;
• deadlines met.

Without this, the landlord could delay the resolution for months. With this, predictability is gained.

Tenant's right of first refusal: when the house is sold

There's a topic that surprises a lot of people: the right of first refusal.

In certain cases, when the landlord intends to sell the rented property, the tenant may have the right of first refusal in the purchase, provided that the legal requirements are met.

This is not a "favor." It is a legal protection mechanism.

If you're facing a sale and don't want to be caught off guard, see Right of First Refusal: When can it be exercised?.

A well-drafted lease agreement prevents litigation.

Some people see clauses as a complication. In lease agreements, clauses are a safeguard.

A well-drafted lease agreement protects the landlord against default and protects the tenant against arbitrary actions.

And it protects both against that common scenario: each one thinking that "it was obvious".

When the contract includes simple communication mechanisms, construction rules, methods for returning the security deposit, and update criteria, it avoids an emotional escalation that often ends up in court.

If you want a broader overview of the law and typologies, you can supplement it with... Lease Agreement: Type and Law.

A practical guide for landlords and tenants before signing.

Before signing, there's a set of simple checks that will save you headaches.

• Read the entire contract, not just the rental amount.
• Confirm deadlines, renewal procedures, and termination rules.
• Finalize expenses and charges in writing.
• Include inventory and photographs.
• Define rules for construction and repair work.
• Clarify the terms of the deposit and refund.
• Confirm addresses and contact information.

This guide is not a substitute for legal analysis, but it reduces obvious risks.

Conclusion

A lease agreement is often the most common contract in people's lives and, paradoxically, one of the least thought about. When things go well, nobody remembers it. When things go wrong, it's the agreement that decides who is right, who pays, and who wastes time.

If you are a landlord, a contract with clear clauses gives you predictability and tools to act when there is a breach of contract.

If you are a tenant, a well-drafted contract gives you security, sets boundaries, and reduces the risk of unfair disputes.

If you are negotiating, renewing, terminating, or resolving a problem with your lease, talk to our team. lawyers in Braga and protect your case strategically.