1. Is the lease contract valid without the signature of Party B?

If one party has actually fulfilled the main obligations of the house lease contract and the other party has accepted the performance, it can be said that both parties have a * * * understanding of the contents of the contract, and the contract is established.

2. Is the lease contract signed by both parties valid?

A contract is a kind of contract concluded by two or more civil subjects on the occurrence, change and elimination of civil legal relationship. A contract is binding on all parties only when they express their wishes.

Therefore, it is effective for both parties to sign a house lease contract. If someone else signs the contract, it is invalid, unless the agent has a power of attorney, which states that the agent is allowed to sign the contract on his behalf.

Third, how to deal with housing lease disputes

1, apply for arbitration to solve the problem.

Arbitration is a legal way for citizens, legal persons or other organizations to apply to the Arbitration Commission for settlement of contract disputes or other property rights disputes. However, if the parties settle their disputes by arbitration, it shall be voluntary, and an arbitration agreement shall be agreed in the contract in advance or reached afterwards. If there is no agreement in the contract in advance and the parties fail to reach an arbitration agreement afterwards, if one party applies for arbitration, the Arbitration Commission will not accept it.

On the other hand, if both parties have agreed in advance in the contract or reached an arbitration agreement afterwards, one party brings a lawsuit to the court, and the court will not accept it. Arbitration has the effect of a judicial act. Once the judgment takes effect, the parties may not bring a lawsuit to the people's court for the same dispute.

2, civil litigation to solve the problem

If the parties agree in the house lease contract to settle the dispute by litigation or fail to reach an arbitration agreement after the dispute occurs, they may directly bring a civil lawsuit to the people's court. If the parties to the lease violate the relevant provisions and the lease contract is invalid, they shall bear civil liability according to law. If the lease contract is terminated due to one party's failure to fulfill the obligations stipulated by relevant laws, the party that fails to fulfill the agreed obligations shall bear civil liability according to law; If property losses or personal injuries are caused to the other party or a third party, it shall be liable for compensation according to law.

According to the above analysis, we can know that if one party has actually fulfilled the main obligations of the house lease contract, and the other party has accepted the performance, it can be said that both parties have a * * * understanding of the contents of the contract, and the contract is established.