Building Contract for House Extension

Building Contract for House Extension: A Comprehensive Guide

If you`re planning to have a house extension, it`s essential to have a building contract. A building contract is a legal agreement between you (the owner) and the builder, outlining the scope of the project, the responsibilities of both parties, and the timeline for completion.

Here are the essential elements that should be included in a building contract for a house extension:

1. Scope of Work: The scope of work should detail the specific tasks that the builder will undertake. It should include a detailed description of the work, such as the materials to be used, the timeline for completion, and the cost of the project.

2. Payment Schedule: The payment schedule should clearly outline how much the builder will be paid and when. It should include the total cost of the project, the deposit required, and the payment schedule for the remainder of the work.

3. Duration of the Project: The duration of the project should be stated in the contract, including the start and end dates. This will ensure that both parties are aware of the timeline and can plan accordingly.

4. Termination Clause: The termination clause should specify the conditions under which the contract can be terminated by either party. Reasons could include delays in completion, costs exceeding the budget, or unsatisfactory work.

5. Insurance and Liability: The contract should specify who is responsible for obtaining the necessary insurance, permits, and licenses required for the project. It should also outline the builder`s responsibility for any damages or injuries that may occur during the construction.

6. Change Orders: The contract should specify the process for changes to the original plan. Any alterations to the scope of work, timeline, or cost of the project should be agreed upon in writing by both parties.

7. Warranties and Guarantees: The contract should establish the builder`s warranty or guarantee for the work performed. This should include a detailed list of the materials used and their expected lifespan, as well as any warranties from manufacturers.

8. Dispute Resolution: The contract should outline a process for dispute resolution between the owner and builder. This could include mediation, arbitration, or a legal process.


A building contract is a critical document when it comes to any construction project, especially a house extension. The contract should be clear, concise, and comprehensive to ensure that both parties are aware of their responsibilities and obligations. Hiring a lawyer or a building professional to help draft the contract can ensure that all legal and technical aspects are appropriately addressed. Ultimately, a good contract will help protect your investment and ensure that your house extension project is completed on time, within budget, and to your satisfaction.