Understanding the Key Changes to Building Regulations in Wales Starting July 2026

If you are planning a new build, extension, renovation, or development project in Wales, you need to prepare for important changes to the Building Regulations coming into effect on 1 July 2026. These updates are part of the Welsh Government’s Building Safety Programme and the Building Safety Act 2022. They introduce new requirements for dutyholders and competence declarations that will affect every project submitted from that date.

This post explains what these changes mean for homeowners, developers, and professionals involved in construction projects in Wales. It also highlights how to avoid delays and costly issues by understanding the new rules early.

New Competence Declarations for Key Dutyholders

One of the most significant changes is the introduction of new competence declarations. These declarations must be completed and signed by the following dutyholders before a Final Certificate can be issued:

• The Client or Homeowner

• The Principal Designer

• The Principal Contractor

  
  

These declarations confirm that each party has the necessary skills, knowledge, and experience to carry out their roles safely and competently. This step aims to improve accountability and ensure that all projects meet higher safety standards.

For example, if you are a homeowner acting as the client for your renovation, you will need to sign a declaration confirming your understanding of your responsibilities. Similarly, the principal designer and contractor must declare their competence in managing design and construction safely.

New Time Limits for Project Commencement

The regulations also introduce strict time limits for starting work on projects. After an Initial Notice is accepted, the project must reach a defined "Commencement Stage" within three years. Simply beginning any work on site will no longer be enough.

The exact requirements for the Commencement Stage depend on the type of project:

• For complex buildings: foundations and lowest floor structure must be completed

• For extensions: foundations and substructure must be completed

• For material alterations: around 15% of permanent works must be completed

  
  

If these milestones are not met within the three-year window, the application may lapse. This means you would need to submit a new application, causing delays and additional costs.

What These Changes Mean for Homeowners and Developers

For homeowners and developers, these changes bring new responsibilities and require careful planning:

• Homeowners acting as clients must understand their role in managing safety and competence declarations. This may require seeking professional advice to avoid mistakes.

• Developers and contractors need to ensure projects meet the new commencement milestones on time to avoid lapsing applications.

• Designers and contractors must demonstrate their competence clearly through signed declarations, increasing transparency and safety on site.

  
  

Failing to meet these requirements could lead to project delays, increased costs, and difficulties in obtaining final certification.

How to Prepare for the New Regulations

Preparation is key to navigating these changes smoothly. Here are practical steps to take now:

• Engage professionals early: Work with architectural consultants, designers, and contractors familiar with the new regulations.

• Understand your role: If you are a homeowner client, learn what the competence declaration involves and how to fulfill your duties.

• Plan project timelines carefully: Ensure your project schedule allows reaching the required commencement stage within three years.

• Keep clear records: Document all declarations and milestones to provide evidence for final certification.

• Seek guidance: Consult experts who can help coordinate compliance and avoid lapsing applications.

  
  

How Innovate Architecture Can Support Your Project

At Innovate Architecture Ltd, we are already prepared for these regulatory changes. Our team can guide you through the new requirements from the earliest stages of your project. We offer:

• Advice for homeowners on their responsibilities as clients

• Project design and management aligned with new dutyholder requirements

• Coordination with contractors and consultants to demonstrate compliance

• Support to avoid delays, lapsing notices, and costly regulatory issues

• Clear guidance throughout planning, design, and construction phases

  
  

If you are considering a project in Wales, now is the time to seek professional help to ensure your build meets the new standards and progresses smoothly.

The upcoming changes to Building Regulations in Wales will raise the bar for safety and competence in construction projects. Understanding these new requirements early will help you avoid delays and additional costs. Whether you are a homeowner or developer, preparing now and working with knowledgeable professionals will make your project more successful and compliant.