Planning Permission for House Extensions & Residential Projects in Essex
Providing planning permission services for home extensions, loft conversions and residential projects across Essex, East London and surrounding areas — from the first conversation through to council approval.
What Is Planning Permission?
Planning permission is the process of getting formal approval from the council before carrying out certain types of building work or changes to a property. When homeowners are planning an extension or conversion, one of the first questions they ask is: do I need planning permission?
The answer depends on the type of project, the property, and the size and design of the proposed work. Not every project requires full planning permission. In fact, most residential extensions and alterations are dealt with through one of two routes:
- Permitted Development — a set of national rights that allow certain work without a full planning application
- A Householder Planning Application — required when permitted development does not apply
Kirkwood assesses each project individually and advises homeowners on the most appropriate route before preparing and submitting any application. We work with homeowners across Essex and East London, helping them understand what is possible, what approval is needed, and how to move their project forward.
Projects Kirkwood handles planning permission for
Single storey extensions Double storey extensions Side extensions Rear extensions Loft conversions Garage conversions Garden rooms Outbuildings Porches Annexes
Permitted Development — Do You Need a Full Planning Application?
Many homeowners assume that any extension requires full planning permission. This is not usually the case. A significant number of residential projects can be completed under Permitted Development rights — meaning a full planning application may not be required.
However, this does not mean no application is needed at all. For most Permitted Development projects, Kirkwood applies to the council for a Certificate of Lawful Proposed Development. This is formal confirmation from the council that the proposed work meets Permitted Development rules and can legally proceed. It is an important document — without it, you have no formal proof that your extension is lawful, which can cause problems when you come to sell or remortgage.
What Permitted Development typically covers | Certain single storey rear extensions within size limits, loft conversions within volume limits, garage conversions, garden rooms, outbuildings, and porches — subject to the specific rules for each project type and property. |
What Permitted Development does NOT cover | Properties in conservation areas or national parks, listed buildings, flats and maisonettes, properties where permitted development rights have been removed by a planning condition, and projects that exceed the size or height limits for each category. |
The Certificate of Lawful Development | Even where no full planning application is needed, Kirkwood recommends — and always applies for — a Certificate of Lawful Proposed Development. This formally confirms your project is lawful and protects your position with buyers, mortgage lenders and solicitors. |
How Kirkwood advises on this | Kirkwood reviews each project in detail before advising on the correct route. The rules surrounding Permitted Development are complex and have changed in recent years. Getting the right advice before starting work is essential. |
Householder Planning Applications — When They Are Required
Where Permitted Development does not apply, a Householder Planning Application is the route most commonly used for residential extension projects. This is a formal application to the local planning authority — your local council — for permission to carry out the proposed work.
A Householder Planning Application is typically required for:
- Extensions that exceed Permitted Development size or height limits
- Side extensions in conservation areas or properties with Article 4 Directions
- Properties where Permitted Development rights have been removed
- Larger or more complex alterations that fall outside standard Permitted Development rules
Kirkwood prepares all of the architectural drawings required for the application, submits the application to the council on the client’s behalf, and manages all communication with the council throughout the process — including responding to any queries or requests for additional information.
A Householder Planning Application typically takes 8 weeks for the council to determine, though this can vary by council and by the complexity of the proposal.
How Much Does Planning Permission Cost?
Planning permission costs have two components: the council application fee paid directly to the local authority, and the architectural fee for preparing the drawings and managing the process. At Kirkwood, the planning application process is included within the architectural package — we prepare the drawings, submit the application, and manage communication with the council as part of the service.
Council fees are set nationally but can change, so the figures below should be verified before quoting to a client. The council fee is paid directly to the local authority and is separate from Kirkwood’s professional fees.
Application Type | Council Fee (approx) | Timescale | Used For |
|---|---|---|---|
Certificate of Lawful Development | Approx £350 | 5–8 weeks | Confirms permitted development projects are lawful |
Householder Planning Application | Approx £600+ | 8–10 weeks | Required for extensions beyond PD limits |
Pre-Application Advice | Varies by council | 4–6 weeks | Optional — useful for complex or uncertain proposals |
Full Planning Permission | Approx £600+ | 8–13 weeks | Larger developments, new builds, major changes |
These are council application fees only and do not include Kirkwood’s professional fees for preparing drawings and managing the application. Contact Kirkwood for a full cost breakdown for your specific project.
Pre-Application Advice — Is It Worth It?
For projects where there is uncertainty about whether planning approval is likely, Kirkwood can help with a pre-application submission to the council. This gives homeowners the opportunity to discuss a proposal with a planning officer before the main application is submitted.
Pre-application advice can help to:
- Understand what the council is likely to accept before committing to a full application
- Identify potential design issues or policy conflicts early — before any fees are paid
- Make amendments to the design that improve the chances of approval
- Reduce the risk of refusal, delays, or requests for additional information
Pre-application advice is not required for every project. For straightforward permitted development projects or standard householder applications, it adds unnecessary time and cost. Kirkwood advises on a case-by-case basis whether pre-application advice is worthwhile for a specific project.
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Based in Brentwood, Essex, we were also introduced to builders and tradespeople through Kirkwood, and they were excellent—professional, respectful, and a pleasure to work with. If we ever take on another project, we wouldn’t hesitate to use them again.
We now have an amazing extension, and would be happy to use the team again.
Very knowledgeable and contactable throughout the process.
Couldn't ask for a better outcome and value for money.
Will definitely be recommending and 100% will use again!
5 star!!!
Why Choose Kirkwood for Planning Permission
The right advice at the start of a project can save significant time, cost, and stress. Kirkwood specialises in residential extension projects and has extensive experience helping homeowners achieve planning approval across Essex, East London, and surrounding areas.
Kirkwood's Planning Permission Process
Kirkwood manages the planning process on behalf of homeowners, making it as straightforward as possible. Here is what to expect at each stage.
Honest Reviews from Our Customers
We ask every customer to leave us an honest review. Not everyone gets around to it, but for those who do, we appreciate it. It’s not just about 5-star ratings—it’s about helping future customers navigate this sometimes tricky industry. If you have a moment, we’d love to hear your feedback.
Based in Brentwood, Essex, we were also introduced to builders and tradespeople through Kirkwood, and they were excellent—professional, respectful, and a pleasure to work with. If we ever take on another project, we wouldn’t hesitate to use them again.
We now have an amazing extension, and would be happy to use the team again.
Very knowledgeable and contactable throughout the process.
Couldn't ask for a better outcome and value for money.
Will definitely be recommending and 100% will use again!
5 star!!!
Planning Permission vs Building Regulations — What Is the Difference?
Planning permission and building regulations are two separate approval stages, and it is important to understand the difference between them.
Planning permission focuses on whether the council accepts the proposed development — the appearance, size, and impact of the extension on the surrounding area. Building regulations focus on how the project will be constructed — the structural safety, insulation, fire safety, ventilation, and drainage. Both are required for most extension projects, but they are managed separately and at different stages of the project.
Stage | What It Covers |
|---|---|
Planning Permission | Does the council approve the project? Focuses on appearance, scale, and impact. Submitted before construction. Managed by Kirkwood as part of the architectural package. |
Building Regulations | Is the project constructed correctly? Focuses on structural safety, insulation, fire safety, ventilation, and drainage. Submitted after planning is approved. Kirkwood offers a separate Building Regulations drawing service. |
Kirkwood’s architectural designs are always created with building regulations in mind. Building Regulations drawings and approval are a separate stage of the project — please see the Building Regulations Drawings page for more information.
Start Your Project the Right Way — Book a Free Discovery Call
Before finding a builder or committing to any fees, Kirkwood provides a free Discovery Call to help homeowners understand their project in full.
During the call, we cover:
- Your ideas and what you want to achieve
- Whether planning permission is required and which route applies to your project
- Likely architectural costs
- Structural engineering costs
- Building regulations costs
- Estimated build costs
- The next steps for your specific project
By the end of the call, you will have a clear understanding of what your project involves and what it is likely to cost. If you decide to proceed, Kirkwood begins with the architectural package — creating your drawings and managing the planning process on your behalf.
Book your free discovery call
No charge. No obligation. Just a clear, honest conversation about your project.
Kirkwood works with homeowners across Essex, East London and surrounding areas including Chelmsford, Brentwood, Basildon, Billericay, Wickford, Rayleigh, Southend, Colchester, Thurrock, Epping Forest and Havering.
Planning Permission — Frequently Asked Questions
Does my house extension need planning permission?
Not necessarily. Many house extensions in Essex qualify as Permitted Development and do not require a full planning application. However, a Certificate of Lawful Proposed Development is usually still required to formally confirm compliance. Kirkwood assesses this for every project during the free Discovery Call before any drawings are prepared.
What is Permitted Development?
Permitted Development is a set of national rights that allow homeowners to carry out certain types of work — including some extensions, loft conversions, and garage conversions — without a full planning application. The rules are specific and complex, and not every property qualifies. Kirkwood reviews each project individually to confirm whether Permitted Development applies.
What is a Certificate of Lawful Development and do I need one?
A Certificate of Lawful Proposed Development is a formal document from the council confirming that your extension or alteration is lawful under Permitted Development. Even when a full planning application is not required, Kirkwood strongly recommends obtaining this certificate. Without it, you have no formal proof that the work is lawful — which can cause problems when selling or remortgaging. Kirkwood applies for this as part of the architectural service.
What is a Householder Planning Application?
A Householder Planning Application is a formal application to the local planning authority for permission to carry out work on a residential property. It is required when Permitted Development does not apply — for example, for larger extensions, properties in conservation areas, or projects where Permitted Development rights have been removed. Kirkwood prepares all drawings and manages the application on the client’s behalf.
How much does planning permission cost?
Council fees are approximately £350 for a Certificate of Lawful Development and approximately £600 or more for a Householder Planning Application. These fees are paid directly to the council and are separate from Kirkwood’s architectural fees. Kirkwood includes the preparation and submission of planning applications within the architectural package. Contact Kirkwood for a full cost breakdown for your specific project.
How long does planning permission take?
A Certificate of Lawful Development typically takes 5 to 8 weeks. A Householder Planning Application typically takes 8 to 10 weeks, though this varies by council. Kirkwood manages the process and keeps clients updated throughout — you do not need to contact the council directly.
What happens if planning permission is refused?
If a planning application is refused, the applicant has the right to appeal the decision or resubmit an amended application. Kirkwood reviews the reasons for refusal, advises on the best route forward, and where appropriate amends the design and resubmits. In most cases, Kirkwood identifies and resolves potential issues before submission to avoid refusal in the first place.
What is pre-application advice and when is it useful?
Pre-application advice is an informal discussion with a council planning officer before a formal application is submitted. It can be useful for complex or uncertain proposals where there is a risk of refusal. Kirkwood advises on a case-by-case basis whether pre-application advice is worthwhile for a specific project — for straightforward applications, it is usually not needed.
What is the difference between planning permission and building regulations?
Planning permission is about whether the council approves the proposed development — its appearance, scale, and impact. Building regulations are about how the project is constructed — structural safety, insulation, fire safety, and drainage. Both are usually required for extension projects, but they are separate processes managed at different stages. Kirkwood offers a Building Regulations Drawing service in addition to the planning service.
Can Kirkwood manage the full planning process on my behalf?
Yes. Kirkwood manages everything — from assessing the correct planning route, preparing architectural drawings, submitting the application, communicating with the council, and tracking progress through to a decision. Clients do not need to deal with the council directly at any stage. To get started, book a free Discovery Call to discuss your project.
Get a no-obligation, free quote
Tell us about your project — whether it is an extension, loft conversion, renovation, or just a set of drawings you need. We will confirm your planning position, give you an honest cost estimate, and explain exactly what is involved.
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Design and Build Service Across Essex
Kirkwood provides design and build services for house extensions, loft conversions, and renovations across Essex and parts of East London. The service area includes Brentwood, Billericay, Chelmsford, Wickford, Basildon, Rayleigh, Leigh-on-Sea, Southend-on-Sea, Hornchurch, Benfleet, Chigwell, Braintree, Colchester, Grays, and surrounding areas.
If you are not sure whether Kirkwood covers your specific address, call 01268 944233 or get a free quote online — we confirm within 24 hours.