Planning Permission vs Building Regulations: Why Homeowners Get Confused
One of the most common questions we hear from homeowners is whether they need planning permission or building regulations approval for their project.
The confusion is understandable. Both processes are required by local authorities, both involve submitting drawings, and both can affect whether your project can proceed. However, planning permission vs building regulations are two completely different approvals that serve different purposes.
Understanding the distinction can save time, money and frustration when planning an extension, renovation, loft conversion or new build home.
1. What Is Planning Permission?
Planning permission focuses on how a development affects it’s surroundings.
When a local planning authority reviews an application, it considers factors such as:
The appearance of the proposed development
Impact on neighbouring properties
Privacy and overlooking
Scale and massing
Heritage considerations
Local planning policies
Environmental impacts
In simple terms, planning permission asks:
“Should this development be allowed in this location?”
Some projects can proceed under Permitted Development Rights and may not require full planning permission.
For Further information and guidance regarding Permitted Development or Planning Permission, take a look at our article here.
For guidance on planning policy, homeowners can refer to the UK Government’s Planning Portal.
2. What Are Building Regulations?
Building regulations are entirely separate from planning permission.
They focus on the technical performance and safety of a building.
Building regulations cover areas such as:
Structural integrity
Fire safety
Ventilation
Insulation and energy efficiency
Drainage
Accessibility
Electrical safety
In simple terms, building regulations ask:
“Is this building safe and compliant to construct?”
Even if planning permission is not required, building regulations approval often still applies
Detailed guidance is available through the UK Government Building Regulations resource.
3. Planning Permission vs Building Regulations: The 7 Essential Differences
1. Purpose
Planning permission considers the impact of development on the surrounding area.
Building regulations ensure the building is safe, functional and energy efficient.
2. Who Reviews the Application?
Planning applications are assessed by planning officers at the local authority.
Building regulations are assessed by building control officers or approved inspectors.
3. Design vs Technical Compliance
Planning focuses on appearance and impact.
Building regulations focus on construction standards and technical performance.
4. Drawings Required
Planning applications generally require:
Site plans
Existing drawings
Proposed drawings
Building regulations submissions require much more detailed technical information, including construction details and specifications.
5. Timing
Planning approval is usually obtained before technical design progresses.
Building regulations approval is often sought once planning approval has been secured.
6. Approval Does Not Automatically Mean Approval of the Other
A project can receive planning permission but fail building regulations approval.
Likewise, technically compliant drawings do not guarantee planning approval.
7. Most Projects Need Building Regulations
Many homeowners are surprised to learn that projects falling under permitted development rights often still require building regulations approval.
This is one of the most important distinctions when comparing planning permission vs building regulations.
4. Do You Need Both Planning Permission and Building Regulations?
The answer depends on the project.
Typical House Extension
Usually requires:
Planning Permission (unless permitted development applies)
Building Regulations Approval
Loft Conversion
May not require planning permission.
Usually requires building regulations approval.
Internal Alterations
Often do not require planning permission.
May still require building regulations approval if structural work is involved.
New Build Home
Will almost always require:
Planning Permission
Building Regulations Approval
Because every project is different, professional advice should be sought before starting work.
5. Common Misconceptions
Many homeowners believe building regulations approval automatically grants permission to build.
This is incorrect.
The two approvals are entirely separate.
Starting Work Too Early
Beginning construction before obtaining the necessary approvals can result in delays, enforcement action and additional costs.
Underestimating Technical Requirements
Even relatively simple projects may require structural calculations, energy assessments and detailed construction information.
Not Seeking Professional Advice
Early involvement from an architect can help identify potential planning constraints and technical requirements before significant costs are incurred.
6. Real-World Example
Imagine a homeowner wants to build a rear extension.
The planning authority may approve the proposal because it is appropriately sized and does not negatively impact neighbouring properties.
However, before construction can begin, building regulations approval is still required to demonstrate that:
Foundations are suitable
Structural elements are adequate
Insulation meets current standards
Fire safety requirements are satisfied
This example clearly illustrates the difference between planning permission vs building regulations.
7. How TAOB Can Help
At TAOB, we help clients:
Assess planning requirements
Prepare planning applications
Develop technical designs
Coordinate building regulations submissions
Liaise with consultants and local authorities
By considering planning and technical requirements together, projects can progress more efficiently from concept to construction.
8. Final Thoughts on Planning Permission vs Building Regulations
Understanding planning permission vs building regulations is one of the most important steps before starting any building project.
Planning permission determines whether a development is acceptable in principle, while building regulations ensure it is safe and compliant to construct.
Many projects require both approvals, and confusing the two can lead to unnecessary delays and costs.
If you’re considering an extension, renovation, loft conversion or new build project, obtaining professional advice early can help ensure a smoother journey from initial ideas through to completion.
