Do I Need Planning Permission for a Front Extension? 2026 (UK)
In almost all cases, yes. A front extension projects beyond the principal elevation of your house — the wall that fronts a highway — and that is specifically excluded from permitted development, so it needs a householder planning application. The one common exception is a small porch, which has its own separate allowance. This guide explains exactly where the line falls, the 2026 fees, how to apply, and how long it takes.
The short answer
A genuine front extension needs planning permission. Permitted development lets you extend at the rear and, within limits, the side — but not out past the front wall that faces the road. The only routine way to add to the front without an application is a small porch that stays inside the porch limits below. If you are unsure whether your plan counts as a porch or an extension, a Lawful Development Certificate settles it in writing.
| What you want to build at the front | Planning permission? |
|---|---|
| Small porch within the porch limits (see below) | Usually not — permitted development |
| Porch larger than 3m², or over 3m high, or within 2m of a highway boundary | Yes |
| Front extension adding a room (bay, hall, garage conversion projecting forward) | Yes |
| Any front addition on a flat, maisonette or listed building | Yes |
| Any front addition where an Article 4 direction applies | Yes |
What getting permission costs — 2026
England householder fees plus typical drawing costs. Fees current for 2026.
Sources: MHCLG planning fee schedule (England) · BestBuilders 2026 quote data
Why front extensions are excluded from permitted development
Permitted development rights let you make many changes without a planning application, but they draw a hard line at the principal elevation — the main face of the house, which for most homes is the front wall facing the road. The rules specifically say an extension must not extend beyond a wall forming the principal elevation, or beyond a side wall that fronts a highway. A front extension does exactly that, so it falls outside permitted development and needs a householder planning application.
This is why rear extensions are so much simpler: at the back you are not touching the elevation that faces the street, so within the size and height limits you can often build under permitted development. Move the same box to the front and the right to build it disappears.
The porch exception — the one thing you can add to the front
A porch has its own permitted development allowance, separate from the extension rules. You can build a porch at any external door without planning permission as long as all of these hold:
- The ground-floor area (measured externally) is no more than 3m².
- No part is more than 3 metres high.
- No part is within 2 metres of any boundary that fronts a highway.
Break any one of those and the porch needs planning permission. And note the porch rules cover a genuine covered entrance — the moment the structure becomes a usable room, or joins the house as extra floor space, it is treated as a front extension and the exception no longer applies. If your porch is close to the limits, a Lawful Development Certificate gives you documented proof it is lawful, which is worth having when you sell.
Other things that change the answer
Permitted development is not universal. Even where a rule would normally allow something, these remove or restrict it:
- Flats and maisonettes have no permitted development rights for extensions at all — any addition needs permission.
- Listed buildings need listed building consent as well as planning permission, and the bar is high.
- Conservation areas, National Parks and AONBs have tighter limits and sometimes removed rights.
- Article 4 directions let a council withdraw permitted development for a street or area — common on period frontages, and they catch front alterations in particular.
- Planning conditions on a newer estate may already have removed permitted development when the homes were built.
Always check with your local planning authority before you assume anything is permitted. Our planning permission guides cover the common projects one by one.
Building regulations apply either way
Planning permission and Building Regulations are two separate approvals. Even a porch that needs no planning permission may still need Building Regulations — and a front extension always does. Building control checks the foundations, structure, insulation, drainage, electrics and any new or altered openings, and signs the work off on completion. A porch is exempt from Building Regulations only if it is under 30m², at ground level, separated from the house by the existing external door, and does not cover a controlled service; otherwise it is in scope. Budget for building control fees on top of the planning fee.
How to apply, and the 2026 fees
A front extension goes in as a householder planning application through the Planning Portal or your council. You will need a location plan, a site plan and scaled drawings of the existing and proposed elevations. The 2026 costs:
| Item | 2026 cost (England) | Notes |
|---|---|---|
| Householder planning application | £548 | The application fee paid to the council |
| Lawful Development Certificate | £274 | To confirm a porch is permitted development |
| Architect or technician drawings | £750–£1,500 | More for a design-led scheme |
| Building control | £300–£900 | Full plans or building notice |
A good builder or an architect will handle the drawings and the submission for you — compare quotes for the build itself through our free quote service, and see typical build costs on the extension cost guide.
How long it takes
A householder application is normally determined within 8 weeks of the council validating it. Before that clock starts you need drawings prepared (1–3 weeks) and the application validated (a few days to a couple of weeks). Realistically, budget two to three months from deciding to build to holding a decision, and do not order materials or book a start date until permission is granted.
Before you commit: checklist
- Confirm whether your plan is a porch (within the 3m² / 3m / 2m limits) or a front extension — the answer decides everything else.
- Check for an Article 4 direction, conservation-area status or removed rights on your property with the council.
- Get scaled existing and proposed drawings — a valid application needs them.
- Ask your builder or designer to confirm who is submitting the application and signing off building control, and get it in writing.
- Do not start on site until you hold written planning permission — building first and applying later risks an enforcement notice.
Common mistakes
- Assuming a front porch is automatically allowed — the 2m-from-a-highway rule catches many terraced and semi frontages.
- Treating a forward-projecting garage conversion or bay as "just a bit of front" — it is a front extension and needs permission.
- Relying on a neighbour's build as proof — their permission, or an older rule, may not apply to you.
- Building first and applying afterwards — retrospective refusal can mean tearing it down.
Frequently asked questions
Yes, in almost all cases. An extension that projects beyond the principal elevation of your house — the wall that fronts a highway — is specifically excluded from permitted development, so a front extension needs a householder planning application. The main exception is a small porch, which has its own separate allowance.
A porch is a small covered entrance. It stays permitted development if its ground-floor area is no more than 3m², no part is higher than 3 metres, and no part is within 2 metres of a boundary next to a highway. Anything larger, or that adds a full room to the front, is a front extension and needs planning permission.
The householder planning application fee in England is £548 in 2026. A Lawful Development Certificate, if you want to confirm a porch is permitted development, is £274. Drawings from an architect or technician usually add £750–£1,500.
A householder application is normally determined within 8 weeks of validation. Allow extra time for drawings, submission and any request for more information, so budget two to three months from starting.
Yes. Building Regulations apply to the structure, foundations, insulation, drainage and any new openings regardless of whether planning permission is needed. A building control body inspects and signs the work off.
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