One of the most common areas of confusion for homeowners starting a residential project is understanding what permitted development actually means and whether it applies to their property.
In simple terms, permitted development allows certain types of residential work to be carried out without needing to submit a full planning application, provided the proposal falls within specific rules and limitations.
For many homeowners across Worthing, West Sussex and the South Coast, permitted development can provide a simpler route for smaller residential projects such as extensions, loft conversions and alterations.
However, permitted development rules can often feel more complex than many people initially expect.
What Types of Work Can Fall Under Permitted Development?
Permitted development rights can apply to a range of residential projects, including:
Rear extensions
Certain side extensions
Loft conversions
Rooflights
Garage conversions
Porches
Outbuildings
Whether a project qualifies depends on factors such as:
Size and scale
Height
Location on the property
Previous extensions
Roof alterations
Proximity to boundaries
Every property should always be assessed individually before assumptions are made.
Does Permitted Development Mean No Rules Apply?
No — permitted development still comes with strict limitations and conditions.
Although formal planning permission may not be required, proposals still need to comply with detailed permitted development criteria covering areas such as:
Maximum extension depth
Overall height
Roof alterations
Materials
Boundary relationships
Window placement
Projects exceeding these limits will typically require a full planning application instead.
Are Permitted Development Rights Always Available?
Not always. Some properties have additional limitations, or do not have householder permitted development rights for the proposed work.
A Conservation Area or National Park does not automatically remove every permitted development right. On Article 2(3) land, additional restrictions apply to some householder works, including certain side extensions and external cladding. Listed buildings need separate checks, and an Article 4 direction or a condition on an earlier planning permission can remove specific rights.
Check the property’s designation, planning history and the precise proposal before relying on a permitted development route. The government’s technical guidance for householders explains the detailed rules.
What Is a Lawful Development Certificate?
Even where planning permission is not required, many homeowners still choose to apply for a Lawful Development Certificate.
This is a formal certificate issued by the local authority confirming that the proposed works fall within permitted development rights.
A Lawful Development Certificate can often be useful when:
Selling the property later
Reassuring mortgage lenders
Providing clarity during construction
Confirming compliance officially
The application still requires drawings and supporting information similar to a planning submission.
Do I Still Need Building Regulations Approval?
Usually, yes.
Permitted development only relates to planning permission.
Most residential projects will still require Building Regulations approval before construction begins, particularly where structural work, insulation, drainage or loft conversions are involved.
This is where detailed technical drawings and structural coordination become important.
Can I Build Under Permitted Development Without Drawings?
Technically, drawings may not always be legally required purely for permitted development itself.
However, in practice, accurate drawings are extremely important for:
Confirming compliance
Supporting Lawful Development Certificates
Coordinating builders and engineers
Preparing Building Regulations drawings later
Clear drawings also help avoid misunderstandings and costly issues during construction.
Is Permitted Development Better Than Planning Permission?
Not necessarily — it simply depends on the project.
Some proposals fit comfortably within permitted development limitations, while others benefit from a full planning application to achieve a better overall design solution.
In many cases, understanding the planning options early on can help homeowners make much more informed decisions about the direction of the project.
Understanding the Best Route for Your Project
Permitted development can often provide an excellent opportunity for homeowners to improve and extend their property without the need for full planning permission.
However, because every property is different, it is always important to properly assess the site, planning history and proposal before progressing too far.
At Downland Studio, residential projects are approached collaboratively and practically, helping homeowners across Worthing, West Sussex and the South Coast understand the most suitable planning route for their project before moving into design and technical stages.
If you’re considering extending or altering your home and would like some honest advice before getting started, feel free to get in touch for an informal conversation.
Check the route for your own project
Our Planning Permission guide and Planning Checker offer a starting point for exploring your proposal. Read the difference between planning and Building Regulations, then explore the architectural design fee calculator for the services you may need.
A calculator result does not establish that works are lawful. Discuss your proposal with Downland Studio so the property, planning history and relevant constraints can be considered.