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Planning Permission for Extensions & Home Projects
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Planning Permission for Extensions & Home Projects
Planning permission is often one of the first things homeowners think about when considering an extension or major change to their property.
But not every project needs it.
Some extensions and alterations can be carried out under Permitted Development rights, while others require a full planning application. The answer depends on the property, the proposed work and, in some cases, where you live.
Understanding this early can save a considerable amount of time.
At Tholos, we help establish the right planning route, develop a design that responds to the property and its surroundings, and prepare the drawings and information needed for the application.
Planning Permission explained
Do You Need Planning Permission?
It depends on what you are proposing.
Planning permission is commonly required when work falls outside the limits of Permitted Development or when the property has additional planning restrictions.
Projects that may require an application include:
- larger house extensions
- substantial changes to the external appearance of a property
- some two-storey extensions
- certain loft alterations and dormers
- new buildings within the garden
- projects affecting listed buildings or properties in conservation areas
However, the fact that you are extending your house does not automatically mean you need a planning application.
The first step should be understanding which rules apply to your particular project.
Planning Permission
What Is Permitted Development?
Permitted Development rights allow certain types of work to be carried out without making a standard planning application.
For homeowners, these rights can cover things such as some rear extensions, loft conversions and other alterations, provided the proposed work stays within specific limits and conditions.
Those limits can relate to:
- the size and height of the extension
- how far it projects from the original house
- its position in relation to boundaries
- the materials being used
- the amount of the property being extended
- projects affecting listed buildings or properties in conservation areas
- the location and type of property
Permitted Development can make the planning stage considerably simpler, but the rules need to be checked carefully.
A design that exceeds even one of the relevant limits may require a different planning route.
Planning Permission or Permitted Development?
It is not always a question of choosing whichever process sounds easier.
Sometimes Permitted Development provides enough flexibility to create exactly what you need.
In other cases, making a planning application could allow a better design.
For example, reducing the size of an extension purely to remain within Permitted Development limits may not always make sense if a slightly larger scheme would work significantly better for the property.
The right approach depends on the project.
We look at what you are trying to achieve first, then consider the most appropriate planning route rather than designing everything around a rule before understanding your priorities.
Planning Permission
Planning Permission for House Extensions
House extensions are one of the most common reasons homeowners encounter the planning system.
Planning officers may consider how the proposal relates to:
- the existing house
- neighbouring properties
- the character of the surrounding area
- boundaries and overlooking
- daylight and privacy
- the scale and appearance of the extension
A successful extension should feel appropriate to the property while still giving you the additional space you need.
That does not mean every extension has to imitate the original house exactly.
Contemporary additions can often work extremely well, provided the overall design responds appropriately to the existing building and its context.
Planning Permission
Planning a Rear Extension
Rear extensions can often provide greater design freedom than changes to the front of a property.
Depending on the size, position and property type, some rear extensions may fall within Permitted Development rights.
Others will require planning permission.
The design still needs to consider its relationship with neighbouring properties.
A large extension close to a boundary, for example, could have a very different impact from the same extension on a detached property with a larger garden.
Height, projection, window positions and the overall mass of the extension all matter.
This is why planning should be considered as part of the design rather than as a separate form-filling exercise afterwards.
Planning Permission
Two-Storey Extensions
Two-storey extensions generally require more careful planning consideration because their impact can be greater.
They can affect neighbouring daylight, outlook and privacy and can significantly alter the external appearance of the house.
Important considerations may include:
- the distance from neighbouring properties
- proximity to boundaries
- window positions
- roof design
- the scale of the extension
- how the new work relates to the original house
Loft Conversions and Planning Permission
Many loft conversions can be completed under Permitted Development rights, but this is not always the case.
Planning permission may be required where a proposal exceeds the permitted limits or where restrictions apply to the property.
The location and form of dormers can also be important.
Large alterations visible from the street are generally treated differently from changes contained towards the rear of a property.
Even where planning permission is not required, a loft conversion will usually still need to comply with Building Regulations.
Planning and Building Regulations are separate processes.
Planning Permission
Planning Drawings
Planning drawings communicate what you are proposing to the local planning authority.
They normally show both the existing property and the proposed development so the changes can be understood clearly.
Depending on the project, the application may include:
- existing and proposed floor plans
- existing and proposed elevations
- site and location plans
- roof plans where relevant
- sections where needed to explain the design
These drawings are primarily intended to explain the scale, appearance and relationship of the proposal to the existing property.
They are not normally detailed enough for a builder to construct the project from.
That comes later.
Planning Drawings Are Not Building Drawings
This distinction is important.
Obtaining planning permission means the council has accepted the development in planning terms.
It does not mean the project is ready for construction.
Planning drawings usually do not contain enough information about foundations, insulation, structural design, drainage, construction build-ups or technical details.
After planning, the design normally needs to be developed further.
That is where Building Regulations, structural design and technical drawings become important.
Planning Permission
What Happens During a Planning Application?
Once an application is submitted, the local planning authority checks the information and begins the assessment process.
Neighbours may be notified and relevant consultees may be invited to comment.
The planning officer then considers the proposal against national and local planning policies.
They may also look at issues such as:
- design and appearance
- impact on neighbouring properties
- privacy and overlooking
- local character
- parking or access where relevant the design
- heritage considerations
For straightforward residential applications, a decision is normally expected within the statutory determination period, although applications can sometimes take longer.
Planning Permission
What If the Planning Officer Wants Changes?
A planning application does not always move directly from submission to approval or refusal.
Sometimes the planning officer identifies a particular concern and asks whether the proposal can be amended.
Where appropriate, a relatively small design change may resolve the issue.
That could involve changing the height of part of an extension, adjusting a window or modifying another element of the proposal.
Whether amendments can be accepted during the application depends on their scale and the local authority’s approach.
The aim should be to respond sensibly without compromising the project unnecessarily.
What Happens If Planning Permission Is Refused?
A refusal does not necessarily mean the end of the project.
The decision notice should explain why permission was refused.
Depending on those reasons, it may be possible to redesign the proposal and make a new application.
There is also a planning appeal process, although redesigning and resubmitting can sometimes be the more practical route for a residential project.
Understanding the reason for refusal is important.
There is little value in simply submitting essentially the same design again without addressing the council’s concerns.
Planning Permission
Conservation Areas and Listed Buildings
Some properties have additional restrictions that affect what can be changed.
Conservation areas are intended to protect the special character of particular locations, so alterations may receive greater scrutiny.
Listed buildings have a separate consent regime because changes can affect their historic or architectural significance.
In these situations, design decisions often need to respond more carefully to existing materials, proportions and architectural features.
Permitted Development rights may also be restricted or removed.
It is therefore particularly important to understand the status of the property before developing the proposal too far.
What Is a Lawful Development Certificate?
If work falls within Permitted Development rights, a homeowner may choose to apply for a Lawful Development Certificate.
This provides formal confirmation from the local authority that the proposed work is lawful without requiring a standard planning application.
Although it is not always mandatory, having formal evidence can be useful.
For example, it can provide reassurance when selling the property later or where you simply want certainty before investing in construction.
Planning Permission Does Not Mean You Are Ready to Build
This is one of the most important parts of the process.
Planning approval is a milestone, not the end of the design stage.
Once permission has been obtained, the project may still require:
- Building Regulations information
- structural design
- technical construction drawings
- drainage coordination
- specifications and construction details
Those pieces allow the design approved in principle to become something a contractor can accurately price and build.
Planning Permission
From Planning Approval to Builder Tender
Once planning issues have been resolved, the project can move into much greater technical detail.
This is the stage where decisions about structure, materials, insulation, junctions and construction methods are developed and coordinated.
Completing this work before approaching builders has an important advantage.
It means contractors are pricing a defined project rather than trying to fill gaps themselves.
That gives you:
- clearer quotations
- fewer assumptions
- a better basis for comparing builders
- greater cost certainty
- fewer unresolved decisions once work starts
Tholos can help take the project from the initial planning design through to the technical information needed before tender.
Client experience
"
Lorem ipsum dolor sit amet, consectetur adipiscing elit. We had a vision for our home but no idea how to realise it. Tholos Interiors took complete ownership of the project — every detail was considered, every decision explained. The result exceeded everything we had imagined.
– Lawrence Ipsum, Homeowner · London –
Planning Permission
Frequently Asked Questions
Do all house extensions need planning permission?
No. Some extensions can be built under Permitted Development rights, provided they meet the relevant conditions and limits.
What is the difference between planning permission and Building Regulations?
Planning considers whether the development itself is acceptable. Building Regulations deal with how it is constructed, including areas such as structure, fire safety, insulation and ventilation.
Can I build an extension under Permitted Development?
Possibly. It depends on the size and location of the extension, the type of property and whether any additional planning restrictions apply.
How long does planning permission take?
A straightforward householder application normally has a statutory determination period of around eight weeks, although actual timescales can vary between local authorities and individual applications.
Do I need planning permission for a loft conversion?
Not always. Many loft conversions fall within Permitted Development rights, but larger alterations or properties with additional restrictions may require permission.
Do I need planning permission to remove an internal wall?
Usually not purely because of planning, although listed buildings can be different. Removing a load-bearing wall will normally involve Building Regulations and structural design.
Can my neighbours stop my planning application?
Neighbours can comment on an application, but they do not personally decide whether permission is granted. The local authority considers relevant planning matters when making its decision.
What happens after planning permission is approved?
The project normally moves into the technical stage, including Building Regulations, structural design and construction drawings before builders are asked to provide final quotations.
Are planning drawings enough for a builder?
Usually not. Planning drawings show the proposed design but generally lack the technical information required for accurate pricing and construction.
Should I find a builder before applying for planning permission?
You can speak to builders at any stage, but it is generally better to define the project properly before obtaining firm quotations. Otherwise builders need to make assumptions about work that has not yet been designed.
Ready to Start Planning Your Project?
Whether your project needs a planning application, can be developed under Permitted Development or you are not yet sure which route applies, Tholos can help you understand the options and develop the right approach from the beginning.
We can then take the project beyond planning into structural design, Building Regulations, technical drawings and builder tender, helping you move from the initial idea towards construction.
Start your project