If you’re about to renovate your home, extend your kitchen, or convert your loft, there’s one question you need to answer first: do you need planning permission?
Whether you’re planning a modest garden room or a full-scale extension, understanding the rules around planning permission is essential. Getting it right ensures your project can move forward smoothly — without risk of refusal, costly delays, or even enforcement action.
At Lynch Brother Homes, we’ve helped homeowners across Oxford and beyond navigate the complexities of planning applications, building regulations, and permitted development rights. This guide brings together everything you need to know, from how to apply and what it costs, to how long it takes and when you can build without it.
Read on for a step-by-step breakdown of the entire planning process.
*If you have specific questions about the process you need answering please visit our comprehensive Planning Permission FAQs page here, alternatively call our team directly for expert advice on the topic.*
Understanding Planning Permission
Planning permission is official approval from your local authority to carry out certain types of building work. In simple terms, it’s a legal check to make sure your project won’t negatively affect neighbours, the environment, or the wider character of your area.
But not every home improvement requires it. To know where you stand, you’ll need to understand a few key distinctions.
What Counts as ‘Development’?
In planning terms, development includes building, engineering, or significant alterations to land or structures. That means things like:
- Building an extension
- Changing how a building is used (e.g. converting a garage into a separate dwelling)
- Adding a new outbuilding, balcony, or large dormer window
Small changes — such as internal remodelling, repainting, or replacing windows like-for-like — generally don’t count and don’t need permission. But the line isn’t always clear-cut.
💡 When in doubt, it’s safer to check before you start work.
You can use the Planning Portal’s interactive guides to understand what’s allowed under Permitted Development rights — or speak to a qualified builder or architect.
Permitted Development vs Full Planning Permission
Some minor works are automatically allowed under what’s called Permitted Development (PD). These rights let you carry out improvements — such as single-storey extensions or garden buildings — without submitting a full planning application.
However, PD rights:
- Don’t apply in conservation areas, AONBs, or for listed buildings
- Have strict limits on height, depth, and placement
- Don’t override building regulations (you may still need approval for safety and structural checks)
When your project goes beyond those limits — or PD doesn’t apply — you’ll need to apply for full planning permission.
👉 We’ll cover common project types like loft conversions, garden rooms, and side extensions in detail below.
Outline vs Full vs Reserved Matters
When applying, there are three common permission types:
- Full Planning Permission – complete approval based on detailed plans. This is the standard route for most home projects.
- Outline Planning Permission – initial consent based on the principle of development, with details (design, access) submitted later.
- Reserved Matters – the follow-up application that fills in those missing details from an outline approval.
Outline permission is more common for larger or multi-phase developments. For most homeowners, full planning permission is the route you’ll be taking.
Planning Portal & Oxford City Council Links
To apply for planning permission in England, most homeowners will submit their application through the Planning Portal — the UK government’s online gateway for planning applications. But it’s your local planning authority (LPA) — in this case, Oxford City Council or the relevant Oxfordshire district — that actually assesses and decides on your application.
Here’s how the two connect — and where to go depending on where you live.
The Planning Portal: Your Starting Point
The Planning Portal (planningportal.co.uk) is where you can:
- Create and submit your planning application
- Upload plans, drawings, and supporting statements
- Pay the relevant fee
- Track your application’s progress
The site also includes interactive visual guides for common home improvements, helping you understand whether your work qualifies under Permitted Development or requires a full application.
💡 You can save your progress and come back later — useful if you’re still finalising drawings or waiting on a survey.
Oxford City Council: Local Policy & Planning Checker
While you submit your application through the Planning Portal, it’s Oxford City Council (or your district council) that will:
- Validate your application
- Notify neighbours
- Assess it against local planning policies
- Make the final decision
Before submitting, it’s smart to check for any local requirements — for example, Oxford City Council may ask for specific reports (like heritage statements or bat surveys) depending on your project.
👉 Use the Oxford City Council Planning Application Checker to:
- Review live and historic applications
- See decisions made on similar projects in your street
- Track how long applications are currently taking
🔗 Oxford City Council Planning Portal: https://www.oxford.gov.uk/info/20066/planning_applications
Other Oxfordshire Authorities
Depending on where you live, your application may be handled by:
- Vale of White Horse District Council
- South Oxfordshire District Council
- Cherwell District Council
- West Oxfordshire District Council
Each has its own planning portal and validation checklist. Check your postcode on the Planning Portal LPA Finder to confirm who your authority is.
🛈 Live in Jericho, Summertown, or Headington Hill? These may fall within conservation areas — meaning stricter rules apply.
How to Apply for Planning Permission
Applying for planning permission might feel intimidating, but with the right preparation, it can be surprisingly straightforward. Whether you’re managing it yourself or working with a builder or architect, this section will walk you through each step of the application process — from early conversations with your council to the final decision notice.
Pre-Application Advice: Should You Get It?
Before you submit a formal application, you can request pre-application advice from your local planning authority. This is a chance to get early feedback on your proposal — and flag any potential issues before you’ve paid for drawings or planning fees.
You’ll usually receive:
- Guidance on whether your proposal is likely to be approved
- Notes on design, access, or neighbour impact
- Suggestions for changes to improve your chances
💡 It’s optional, but highly recommended for complex sites, heritage buildings, or first-time applicants.
🗂️ Visit the Oxford City Council pre-application page for costs and response times.
Drawings & Supporting Documents
Most planning applications will need:
- Location plan – showing where the site sits within its surroundings
- Block plan – showing the layout of buildings, access, and boundaries
- Existing and proposed floorplans and elevations
- Design and Access Statement – especially for conservation areas or listed buildings
- Other reports (if required): heritage, flood risk, ecology, tree surveys
If you’re working with a professional, they’ll typically prepare these on your behalf.
Submitting Your Application
Once you’ve gathered your documents:
- Head to the Planning Portal
- Create an account and start a new application
- Upload your documents and pay the application fee
- Submit your proposal
You’ll receive a confirmation email and reference number.
🕵️ Your council has 5 working days to “validate” your application — this means checking all the required information is included. If something’s missing, they’ll ask you to resubmit.
Consultation and Decision Timeline
Once validated:
- Neighbours are notified (usually by letter or site notice)
- Statutory consultees (like Highways or Conservation) may be contacted
- Case officers review your application against national and local policies
The official decision deadline is:
- 8 weeks for most household applications
- 13 weeks for larger projects or developments
- 16 weeks if an Environmental Impact Assessment is needed (rare for homes)
You’ll receive a written decision — either approved, approved with conditions, or refused. If approved, the permission usually lasts for 3 years.
How to Apply for Planning Permission
Applying for planning permission might feel intimidating, but with the right preparation, it can be surprisingly straightforward. Whether you’re managing it yourself or working with a builder or architect, this section will walk you through each step of the application process — from early conversations with your council to the final decision notice.
Pre-Application Advice: Should You Get It?
Before you submit a formal application, you can request pre-application advice from your local planning authority. This is a chance to get early feedback on your proposal — and flag any potential issues before you’ve paid for drawings or planning fees.
You’ll usually receive:
- Guidance on whether your proposal is likely to be approved
- Notes on design, access, or neighbour impact
- Suggestions for changes to improve your chances
💡 It’s optional, but highly recommended for complex sites, heritage buildings, or first-time applicants.
🗂️ Visit the Oxford City Council pre-application page for costs and response times.
Drawings & Supporting Documents
Most planning applications will need:
- Location plan – showing where the site sits within its surroundings
- Block plan – showing the layout of buildings, access, and boundaries
- Existing and proposed floorplans and elevations
- Design and Access Statement – especially for conservation areas or listed buildings
- Other reports (if required): heritage, flood risk, ecology, tree surveys
If you’re working with a professional, they’ll typically prepare these on your behalf.
Submitting Your Application
Once you’ve gathered your documents:
- Head to the Planning Portal
- Create an account and start a new application
- Upload your documents and pay the application fee
- Submit your proposal
You’ll receive a confirmation email and reference number.
🕵️ Your council has 5 working days to “validate” your application — this means checking all the required information is included. If something’s missing, they’ll ask you to resubmit.
Consultation and Decision Timeline
Once validated:
- Neighbours are notified (usually by letter or site notice)
- Statutory consultees (like Highways or Conservation) may be contacted
- Case officers review your application against national and local policies
The official decision deadline is:
- 8 weeks for most household applications
- 13 weeks for larger projects or developments
- 16 weeks if an Environmental Impact Assessment is needed (rare for homes)
You’ll receive a written decision — either approved, approved with conditions, or refused. If approved, the permission usually lasts for 3 years.
Planning Permission Costs
One of the most common questions we hear is: “How much will planning permission cost me?” The answer depends on the type and scale of your project — but it’s more than just the application fee.
This section breaks down what you can expect to pay, including hidden extras that often catch homeowners off guard.
Application Fees
These are the standard government-set fees you’ll pay when submitting through the Planning Portal.
Application Fees (effective 1 April 2025)
| Project Type | Statutory Fee (2025) |
| Householder application – works to a single dwelling (extensions, lofts, garage conversions, etc.) | £528 |
| Householder application – works affecting two or more dwellings | £1,043 |
| Full planning permission – new single dwelling | £723 |
| Outline planning permission (any number of dwellings) | £723 |
| Lawful Development Certificate (LDC) – proposed use or works | £162 |
| Lawful Development Certificate (LDC) – existing use or works | £324 |
When you submit online via the Planning Portal, an additional £70.83 + VAT service charge is applied to any application where the main planning fee exceeds £100.
The government increased all planning fees by 25 % on 1 April 2025. Keep this in mind when setting your budget.
Professional Fees
Unless you’re submitting a very simple application, you’ll likely need support from professionals. Typical costs include:
- Architectural drawings – £400–£1,200 for basic plans; more for full design packs
- Planning consultant (if required) – £600–£2,000 depending on complexity
- Structural engineer – £300–£800 if load-bearing alterations are proposed
These vary by region and project. At Lynch Brother Homes, we offer fixed-fee design packages tailored to your specific project type.
Hidden & Optional Costs
Some projects trigger additional expenses, such as:
- Ecology or bat surveys – £250–£1,000
- Flood risk or drainage reports
- Tree surveys (Arboricultural Impact Assessment)
- Community Infrastructure Levy (CIL) – payable on some new builds and extensions over 100 m² in Oxford
💡 Your planning consultant or architect should flag these early on. They’re usually not included in your standard application fee.
DIY vs Professional Support: A Quick Comparison
| Option | Pros | Cons |
| DIY Submission | Lower upfront cost
Direct control |
Higher risk of refusal
Time-consuming Can miss key documentation |
| Professional Submission | Stronger chance of approval
Guidance through the process |
Additional cost
Needs clear brief from you |
How Long Does Planning Permission Take?
Planning permission isn’t instant — and knowing how long each stage takes can help you plan your build (and budget) more realistically. While most applications follow a standard path, delays can happen — especially if documents are missing or if the application triggers consultations or objections.
Here’s what to expect, from start to finish.
Typical Timelines
Once you’ve submitted your application via the Planning Portal and it’s been validated by your local authority, the clock officially starts ticking.
| Stage | Duration |
| Validation – council checks your application is complete | Up to 5 working days |
| Public consultation – neighbours and consultees notified | Minimum 21 days |
| Assessment by case officer | Ongoing during consultation period |
| Decision issued | Target of 8 weeks for household applications |
Extended Timescales
Some projects can take longer:
- 13 weeks for larger or complex applications
- 16+ weeks if your project requires an Environmental Impact Assessment (rare for residential homes)
- Delays may occur if additional reports are needed (e.g. bat survey), or if revisions are requested mid-process
How Long Is Planning Permission Valid For?
If your application is approved, your planning permission typically lasts:
- 3 years from the date of approval
You must start work within that time. If you don’t, you’ll need to reapply.
🔁 Changing the design or layout? You may need to submit a new application or a “non-material amendment”.
Top Tips to Stay on Track
- Submit everything up front — missing plans or statements can delay validation
- Avoid major changes mid-application — they’ll likely reset the clock
- Stay responsive — if your case officer asks questions, answer promptly
💬 If your application is time-sensitive, consider speaking to the council about a Planning Performance Agreement (PPA), which can provide more structured timelines and support.
Project-Specific Rules
Different types of home improvements fall under different planning rules. Some are covered by Permitted Development (PD) rights, while others will require a full planning application — especially if you live in a conservation area, own a listed building, or are making major changes.
Here’s a breakdown of the most common project types and what you’ll need to consider before you start.
House Extensions
Many single-storey rear extensions can be built under Permitted Development, but you must stay within strict size and design limits.
Permitted Development allows a single-storey rear extension up to 3 m (terraced/semi-detached) or 4 m (detached).
If you need more space, the Larger Home Extension prior-approval scheme lets you extend up to 6 m on a terraced/semi and 8 m on a detached house — provided you complete a neighbour-consultation process and receive written approval from your council.
⚠️ In conservation areas, all extensions require planning permission.
Planning permission will be required if:
- You extend beyond PD limits
- You’re on a designated site (e.g. Oxford’s Headington Hill or North Oxford Conservation Areas)
- Your home has already been extended and maxed out PD rights
Loft & Dormer Conversions
Loft conversions often don’t need planning permission, unless they significantly alter the roof’s shape or height.
You’ll need full planning permission if:
- The dormer faces a public highway
- The roof height increases
- You live in a conservation area
Permitted Development typically allows:
- Up to 40 m² (terraced) or 50 m² (semi/detached) added roof volume
- Rear dormers with non-reflective materials
- Side-facing windows must be obscure-glazed
Always check for roof alterations that might affect neighbouring privacy or the streetscape.
Garden Rooms & Offices
This is a growing trend — and one with strict rules.
Permitted Development rules allow:
- A garden building up to 2.5 m tall, if within 2 m of a boundary
- Larger structures up to 4 m (with a pitched roof) if 2+ m from boundaries
- No sleeping accommodation allowed
- Cannot be used as a separate residence or Airbnb let
⚠️ Buildings forward of the front elevation, or in conservation areas, require permission.
If you’re planning plumbing, heating, or insulation for year-round use, you may also need building regulations approval.
Change of Use (e.g. Garage to Living Space)
Converting a garage into a home office or spare room may not need planning permission if:
- The garage is integral to the house, not detached
- You’re not changing the building’s use class (e.g. not turning it into a separate flat)
- External changes (like windows or doors) are minimal
Detached garages or conversions in Article 4 areas (where PD rights are removed) will usually need permission.
🗂️ Check your title deeds or speak to the council — some homes have conditions preventing garage conversions entirely.
Listed Buildings & Conservation Areas
In Oxford, designated areas like Jericho, Central Headington, and parts of Summertown fall under conservation status.
Key points:
- All extensions and external alterations require planning permission
- Listed Building Consent is needed in addition to planning permission
- You may need a heritage statement and specialist design advice
🛈 Even internal changes to listed buildings may need approval — speak to your architect or the council’s conservation officer early.
What Happens If You Build Without Permission?
It’s surprisingly common: a homeowner extends their property, adds a garden room, or converts a loft — only to discover later that they should have applied for planning permission.
So, what happens next?
In most cases, it’s not the end of the world — but it’s important to act quickly and correctly. Here’s how it works.
Retrospective Planning Applications
If you’ve carried out work without the necessary permission, your first step should be to submit a retrospective planning application. This gives the council a formal opportunity to assess the work already completed.
- If approved, the matter is resolved — you now have legal consent.
- If refused, you may be required to alter or remove the work.
💡 Approval isn’t guaranteed, but councils are usually pragmatic if the work is in line with policy and hasn’t caused harm.
You can apply for retrospective permission via the Planning Portal, just like a standard application.
Enforcement Notices
If the council decides your unauthorised development is unacceptable, they can issue an enforcement notice. This is a legal order that usually requires:
- The removal or reversal of the unauthorised work
- Reinstatement of the original building or use
- Compliance by a set deadline
Failure to comply can result in prosecution and fines.
However, enforcement isn’t automatic. Councils are advised to take a proportionate approach, and may not act at all if:
- The breach is minor or technical
- The development is deemed “lawful” due to time limits (see below)
Four-Year and Ten-Year Rules
- From 25 April 2024, all breaches of planning control in England are subject to a unified 10-year enforcement period. Operational development (building works) no longer becomes immune after four years.
Transitional rule: If your works were substantially completed before 25 April 2024, the previous 4-year limit still applies.
You’ll need to apply for a Lawful Development Certificate (LDC) to formalise this.
Don’t Risk It
Unlawful development can delay home sales, reduce your property’s value, and create a stressful legal situation. If in doubt:
- Speak to a planning consultant or architect
- Request advice from your local planning authority
- Review past approvals via the Oxford Planning Portal
🧭 Fixing things after the fact is almost always more expensive than getting it right first time.
Refusals, Appeals & Resubmissions
Even well-prepared applications can be refused. Maybe the design didn’t meet local policy, neighbours objected, or the planning officer felt it impacted privacy or overshadowed other homes.
A refusal isn’t the end — but it’s important to understand why it happened, and what your next steps should be.
Why Are Planning Applications Refused?
Common reasons include:
- Overlooking or loss of privacy to neighbouring properties
- Overdevelopment of the site (e.g. too large, too dominant)
- Poor design quality or materials
- Impact on character of the street or conservation area
- Lack of information (e.g. missing drawings or supporting statements)
- Breach of local planning policy
💡 Most refusal notices include helpful officer comments. These are your guide to a stronger re-application or appeal.
Appealing a Refusal
If you believe your proposal was wrongly refused, you can appeal to the Planning Inspectorate.
Appeal routes include:
- Written representations – the most common, decided on documents alone
- Informal hearing – round-table discussion with a planning inspector
- Public inquiry – formal, evidence-based appeal (for complex or controversial cases)
🕒 You have 6 months from the date of refusal to appeal. Householder applications have a shorter window — 12 weeks.
🔗 Use the Planning Portal appeal tool to start your appeal.
Resubmitting a Revised Application
In many cases, it’s quicker and more effective to submit a revised application with changes based on the officer’s comments.
Benefits of resubmitting:
- Often more collaborative with planning officers
- Faster than an appeal in most cases
Note: The previous “free-go” rule (which waived the fee for one resubmission within 12 months) was abolished on 6 December 2023. All repeat applications now attract the full statutory fee, even if the design is identical.
💡 If you’re unsure which route to take, speak with a planning consultant or architect familiar with Oxford’s local policies.
How We Can Help
At Lynch Brother Homes, we regularly support clients through refused or stalled applications — identifying solutions that retain your vision while addressing council concerns.
Visit our Planning Support page to learn more about how we can help move your project forward.
