Not always. Many homeowners can build a kitchen extension in Worthing without making a full planning application if the work falls within permitted development rights. An extension without planning permission must still meet strict rules on position, depth, height, previous additions and property type. Homes in a conservation area, properties affected by an Article 4 Direction, flats and some previously altered houses can face tighter controls. Experienced building services in Worthing can help establish the correct planning route before drawings, structural work and kitchen design move too far ahead.
“No full planning permission” does not mean “no planning rules.” Some larger rear extensions need prior approval, and many homeowners choose a lawful development certificate as formal evidence that a proposal is lawful. Building Regulations may also apply separately. Below, you will learn the main permitted development limits, conservation-area restrictions, two-storey rules, prior approval requirements and when a planning application is normally needed.
Can You Build a Kitchen Extension Without Planning Permission in Worthing?
Yes, in suitable circumstances. Permitted development rights allow many houses in England to carry out certain extensions without ordinary householder planning permission. Worthing Council also advises homeowners to check planning history, conservation status, listed-building status and Article 4 restrictions before relying on those rights.
For a typical single-storey rear kitchen extension, the standard permitted development depth is up to 4 metres beyond the original rear wall for a detached house and up to 3 metres for other houses. The extension must also satisfy height, boundary, coverage and design conditions. Larger rear extensions may be possible through prior approval.
“Original house” has a specific planning meaning. It generally means the building as it stood on 1 July 1948, or as first built if constructed later. A conservatory or extension added after that point can affect how much permitted development allowance remains.
Homeowners considering house extensions should therefore have the existing property and proposed footprint assessed together rather than treating the newest extension in isolation.
The Main Permitted Development Rules for a Kitchen Extension
Permitted development is not based on one measurement. A kitchen extension must comply with every relevant condition.
| Planning factor | Typical permitted development position |
| Standard rear projection | Up to 4m detached; up to 3m for other houses |
| Larger single-storey rear extension | Potentially up to 8m detached or 6m other houses, subject to prior approval and eligibility |
| Single-storey height | Generally no more than 4m |
| Extension near a boundary | If within 2m of a boundary, eaves are generally limited to 3m |
| Site coverage | Buildings and additions must not cover more than 50% of the curtilage excluding the original house |
| Side extension | Generally single storey, no more than 4m high and no wider than half the original house |
The proposal cannot exceed the highest part of the existing roof, while the eaves of the enlarged part cannot exceed the existing house’s eaves. Exterior materials should have a similar appearance to those on the existing dwelling.
These rules can overlap. A rear-and-side “wraparound” kitchen extension may need to satisfy both rear and side limits. Previous extensions joined to the new work can also count when the total enlargement is measured. A design that appears modest on a floor plan can therefore fall outside permitted development once the property history is checked.
What Is the Prior Approval Application for Larger Rear Extensions?
A larger single-storey rear kitchen extension may still be permitted development but require the neighbour consultation scheme. In Worthing, this applies where a rear extension exceeds 4 metres and is up to 8 metres for a detached house, or exceeds 3 metres and is up to 6 metres for other houses.
This is often described as a prior approval application, although it is not the same as a normal householder planning application. The homeowner notifies the local planning authority, and adjoining neighbours are consulted about the effect on their amenity.
The usual process is:
- Confirm the property qualifies for the larger-home-extension route.
- Prepare and submit the required plans and information before work starts.
- Allow the council to consult adjoining neighbours.
- Wait for the prior approval process to be completed before beginning the extension.
A neighbour objection does not automatically mean refusal. The council considers whether the proposal would have an unacceptable effect on neighbouring amenity. National guidance also requires this neighbour consultation process for qualifying larger rear extensions.
This larger-extension route is not available in the same way on Article 2(3) land, which includes conservation areas. The property’s location therefore needs checking before relying on the 6-metre or 8-metre allowance.
How Does a Conservation Area Affect a Kitchen Extension in Worthing?
Worthing has several designated conservation areas. Living in one does not mean every kitchen extension is prohibited, but permitted development rights are more restricted. Worthing Borough Council also maintains conservation-area maps and advises homeowners to check whether additional controls apply to their property.
On conservation-area land, a side extension is not permitted development under the usual Class A householder rights. A rear extension that creates more than one storey is also excluded from that route. Certain forms of exterior cladding face additional restrictions.
Article 4 Directions can add another restriction. Worthing Borough Council has Article 4 Directions affecting certain areas, and these can remove specific permitted development rights that would otherwise exist.
Before assuming you can create an extension without planning permission in a conservation area, check:
- whether the address is inside a designated conservation area;
- whether an Article 4 Direction applies;
- whether earlier planning conditions removed permitted development rights;
- whether the building is listed or otherwise heritage-sensitive.
A well-designed extension may still be acceptable through a planning application. The council can then assess scale, materials, neighbour impact and local character instead of the project proceeding automatically under permitted development.
Do Two Storey Kitchen Extensions Need Planning Permission?
A two-storey extension often needs closer scrutiny, but some rear two-storey extensions can qualify as permitted development outside restricted areas if every Class A condition is met.
The enlarged part must not project more than 3 metres beyond the original rear wall and must be at least 7 metres from the rear boundary opposite that wall. Other controls still apply, including height, eaves and existing-extension limits.
A two-storey side extension is not permitted development under standard Class A side-extension rules. On conservation-area land, a rear extension creating more than one storey is also excluded from Class A permitted development.
For a qualifying two-storey rear extension, the roof pitch should, as far as practicable, match the original house. Upper-floor side windows are also subject to privacy conditions, including obscure glazing and opening-height restrictions.
If the project mainly enlarges a ground-floor kitchen, a single-storey design often has a simpler planning route. Adding rooms above makes privacy, outlook and building appearance more significant.
When Is a Full Planning Application Usually Required?
A householder planning application is normally required where the proposal falls outside permitted development rights or those rights are unavailable.
Typical examples include an extension that projects too far, exceeds permitted height, extends forward of the principal elevation, creates a non-permitted two-storey arrangement, or breaches side-extension limits. Permission may also be needed because the property is a flat, listed, in a restricted location, subject to an Article 4 Direction, or affected by a condition on an earlier approval.
A planning application is not necessarily a setback. It can allow a design that would not fit the rigid permitted development envelope. The council can consider the actual merits of the proposal, including architecture, neighbour impact and its relationship with the surrounding area.
For a kitchen, that can sometimes produce a better layout than forcing the project into dimensions chosen only to avoid an application.
Why a Lawful Development Certificate Can Be Worth Having
If your extension qualifies as permitted development, a lawful development certificate is not planning permission. It is formal confirmation from the local planning authority that the proposed development is lawful based on the information supplied.
Worthing’s planning guidance directs homeowners towards a certificate of lawfulness where they want formal confirmation that planning permission is not required.
This matters because permitted development is a legal test. A builder’s opinion, a neighbour’s agreement or a similar extension down the road does not prove that your project is lawful.
A certificate also creates a clear planning record, which can be helpful if questions arise during a later sale, remortgage or building project. Accurate existing and proposed drawings are essential, especially where previous extensions affect the measurements.
Planning Permission and Building Regulations Are Different
Planning permission controls whether development is acceptable in planning terms. Building Regulations deal with how the work is designed and constructed. Worthing Council treats the two processes separately, and national permitted development guidance confirms that permitted development rights do not remove Building Regulations requirements.
A kitchen extension that is permitted development can still require Building Regulations approval. Structural stability, foundations, insulation, ventilation, drainage, glazing, fire safety and electrical work may all need to meet applicable standards.
Kitchen projects also need coordination between the new shell and finished room. Large openings through existing external walls can require structural calculations and support. Drainage routes can affect foundations or floor construction, while ventilation, glazing and insulation choices influence compliance and comfort.
If the extension includes a full internal refit, coordinating the building work with professional kitchen renovation services can reduce clashes between structure, services, cabinetry and final finishes.
The Party Wall etc. Act may also need consideration depending on walls, boundaries and excavation. That sits separately from planning permission and Building Regulations.
A Sensible Planning Check Before You Finalise the Design
Before committing to a kitchen layout or ordering major components, establish the planning position of the extension itself.
A useful pre-design review should examine the property type, original house, planning history, previous extensions, conservation status, Article 4 restrictions, boundaries, proposed depth, height and roof form. It should then identify whether the project needs full planning permission, prior approval, a lawful development certificate or no planning submission beyond other necessary approvals.
This protects the design from avoidable redraws. A kitchen island, storage wall or run of glazing may depend on the exact footprint and structural openings the planning route allows.
National permitted development rules sit alongside Worthing-specific conservation designations, Article 4 Directions and each property’s planning history. You can read more about the Sussex County Construction team before deciding how you want to manage design, approvals and construction.
FAQs About Kitchen Extension Planning Permission in Worthing
How big can a kitchen extension be without planning permission in Worthing?
For a standard single-storey rear extension, permitted development can generally allow up to 4 metres beyond the original rear wall of a detached house or 3 metres for other houses, subject to the remaining conditions. Larger rear extensions may be possible through prior approval.
Can I build a 6-metre kitchen extension without full planning permission?
Potentially. A qualifying terraced or semi-detached house may use the larger-home-extension route for a single-storey rear extension up to 6 metres. Prior approval and neighbour consultation are required, and conservation-area status can change the position.
Do I need planning permission for a kitchen extension in a Worthing conservation area?
Possibly. Some single-storey rear extensions may still be permitted development, but conservation areas have tighter restrictions. Side extensions and rear extensions creating more than one storey do not receive the same Class A permitted development rights.
Is a lawful development certificate compulsory?
No. A lawful development certificate is generally not compulsory simply because an extension is permitted development. It is a useful way to obtain formal confirmation from the council that the proposed work is lawful.
Does prior approval mean I already have planning permission?
No. Prior approval is a separate procedure for certain development that is permitted in principle subject to specified matters being checked. For larger rear house extensions, it includes neighbour consultation and must be completed before work starts.
Can a two-storey rear extension be permitted development?
In some cases, yes. Outside restricted areas, it may qualify if it projects no more than 3 metres beyond the original rear wall, remains at least 7 metres from the opposite rear boundary and meets the other Class A conditions.
Plan the Permission Route Before the Kitchen
A kitchen extension in Worthing does not automatically require full planning permission. Many houses can use permitted development for a carefully designed single-storey rear extension. Larger schemes may use prior approval, while other projects need a householder planning application.
The sensible approach is to establish the legal route before the kitchen design becomes fixed. Check the original house, earlier additions, measurements, conservation status, Article 4 controls and planning history, then coordinate Building Regulations and structural requirements with the approved footprint.
If you are considering a kitchen extension and want the property and proposal reviewed in context, you can contact Sussex County Construction to discuss the intended layout and practical next steps without committing to a particular planning route too early.
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