How Big Can a Garden Shed Be Without Planning Permission in the UK?

There is no maximum size for a garden shed under UK planning law. That surprises most people, because a very confident figure, usually 15m², gets repeated across the internet as if it were written in the planning regulations. It is not. The 15m² rule belongs to Building Regulations, which is an entirely different system. Under permitted development rules in England, you can build a shed larger than 15m² without planning permission, provided you stay within three constraints: overall height, position in the garden, and the 50% coverage rule. This guide explains what those three limits actually mean, where the edge cases are, and the one rule change from 2024 that most shed guides have not yet caught up on.

In this article

• The myth of the maximum size shed
• How high can a garden shed be?
• The 50% rule: how big can it actually be?
• Where can you put a shed?
• When you do need planning permission
• Planning permission vs building regulations
• How many sheds can you have?
• Scotland, Wales and Northern Ireland
• What happens if you get it wrong?
• Frequently asked questions

The myth of the maximum size shed

Let us deal with the 15m² thing once and for all.

Planning permission in England is governed by the Town and Country Planning (General Permitted Development) (England) Order 2015. Schedule 2, Part 1, Class E covers outbuildings, which includes garden sheds, summerhouses, greenhouses, garages and similar structures. Read Class E carefully and you will find rules about height, position, roof type and garden coverage. You will not find a maximum floor area of 15m².

What you will find at 15m² is a Building Regulations threshold. Building Regulations are a separate system that covers structural safety, fire safety and similar concerns. They are not the same as planning permission. You can need one without the other, both, or neither, depending on what you are building.

The practical upshot: a shed of 20m², 25m², or larger is perfectly legal without planning permission in England, as long as it meets the height, position and coverage limits described below. The 15m²/30m² figures come back into play under Building Regs, we cover those separately.

How high can a garden shed be?

Height is where most people trip up, and the rules are slightly more nuanced than a single number.

A few things worth knowing about how height is measured:

The base counts. Height is measured from the highest adjacent ground level to the highest point of the structure. If you lay a concrete slab, build a timber deck, or the ground is uneven, the shed height starts from wherever the ground is highest next to it, not from inside your garden where it might be lower. A 2.4m shed on a 15cm raised slab is 2.55m. That puts it 5cm over the limit near a boundary, and your neighbour only needs to point a tape measure at it.

The 2m boundary rule is about ALL boundaries. Not just the back fence. The side fences count too. A shed positioned 2.1m from the back fence but 1.8m from the side fence is within 2m of a boundary and therefore capped at 2.5m overall.

There is no minimum distance from the boundary. The rules do not say you must be X metres away. You can legally build right up to the fence. The 2m rule only affects the permitted height. Cross that line and you drop from 3m/4m to 2.5m. From a practical standpoint, leaving at least 50cm is worth it: you will need to re-treat timber, replace a panel, or fix a roof at some point, and a shed built flush to the fence makes all of that a favour you are asking of your neighbour.

Most popular

8x4ft Metal Garden Shed with Pent Roof, Grey

A solid mid-size metal shed with a pent roof. At 8x4ft (roughly 3m wide), it sits comfortably within permitted development limits when positioned 2m or more from the boundary.

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The 50% rule: how big can it actually be?

The real size limit for a garden shed under permitted development is this: all outbuildings and extensions combined must not cover more than 50% of the land around the original house.

A few things that trips people up here:

"Original house" means the house as it was first built, or as it stood on 1 July 1948 if older. Not the house as it stands today. If a previous owner added a conservatory, that extension counts toward your 50% even though you had nothing to do with it. If you have already added a single-storey extension yourself, that counts too. The shed gets whatever land is left.

The 50% includes all outbuildings, not just sheds. Garages, summerhouses, greenhouses, garden offices, hot tub enclosures, they all eat from the same allowance. If your garden is 100m² and a previous garage already covers 30m², you have 20m² left for a shed before you hit the 50% cap.

Most standard UK gardens have plenty of headroom. A typical semi-detached has a rear garden of 60 to 100m². At 50%, that is 30 to 50m² of combined outbuilding coverage available. A standard 8x6ft shed is roughly 4.5m², nowhere near the limit. The 50% rule mostly matters on smaller plots, gardens already full of outbuildings, or terraced houses with compact rear yards.

To work out your personal limit: measure the area of land around the house (excluding the footprint of the original house itself), halve it, subtract any existing extensions and outbuildings, and that is what you have left.

Where can you put a shed?

Rear garden: yes. This is where permitted development lives. A shed in the rear garden that meets the height and coverage rules requires no planning permission.

Front garden: almost certainly no. No outbuilding is permitted development "forward of a wall forming the principal elevation", the main wall of the house that faces the road. In practice this means the front garden. Councils are fairly active about enforcing this, particularly when a shed is visible from the street. Front-garden bike stores, bin enclosures and log stores run into the same rule. You can apply for permission, but approval is not guaranteed.

Side of the house: if the side elevation faces a highway (a road, footpath or public right of way), the same restriction applies as for the front garden. On corner plots this catches a lot of people by surprise.

Listed buildings: within the curtilage of a listed building, any outbuilding, no matter how small, requires planning permission. There is no permitted development shortcut.

Designated land (National Parks, the Broads, Areas of Outstanding Natural Beauty, World Heritage Sites): the rules tighten. Outbuildings more than 20m from the house are limited to 10m² of floor area. Outbuildings to the side of the house may need permission.

Conservation areas and Article 4 Directions: conservation areas often have Article 4 Directions (common in conservation areas) which remove some or all permitted development rights. If your area has one, the normal PD rules may not apply. Check with your local planning authority: it takes five minutes and saves a lot of bother.

When you do need planning permission

Permitted development covers a lot, but it is not unlimited. You will need a full planning application if:

• The shed exceeds the height limits for its position in the garden
• It sits forward of the principal elevation (front garden)
• It covers more than 50% of the land around the original house when combined with other outbuildings and extensions
• It is within the curtilage of a listed building
• It is in a designated area and more than 20m from the house with a floor area over 10m²
• Your property has an Article 4 Direction removing outbuilding rights
• New-build estates sometimes have planning conditions removing PD rights entirely: check your original planning consent
• The shed will be used as sleeping accommodation, a self-contained annexe, or for a business that brings customer visits, deliveries, noise or additional traffic

That last point is worth expanding. Storage, a hobby workshop, a gym, a playroom, and ordinary occasional home-office use are all considered "incidental to the enjoyment of the dwellinghouse", which is the test permitted development uses. Running a business that employs people, sees customers arrive, or creates impact on the neighbourhood is a material change of use and needs permission. Quietly writing emails from the shed while your employer thinks you are being very productive at home does not.

Near the fence pick

5x7ft Lean-To Metal Garden Shed with Foundation, White

A lean-to sits naturally close to a wall or fence. Check the assembled height against the 2.5m limit if placing within 2m of the boundary: the product page lists full dimensions.

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Planning permission vs building regulations

These two systems are routinely confused, including by people who should know better. They are entirely separate and you can need one without the other.

Planning permission is about whether you are allowed to build something at all, what it looks like from outside, its size and position in the landscape. The rules above all relate to planning.

Building Regulations are about how it is built, structural safety, fire safety, drainage, energy performance. For garden sheds, the thresholds are:

• Under 15m²: Building Regs do not apply, as long as the building has no sleeping accommodation
• 15m² to 30m²: exempt from Building Regs if there is no sleeping accommodation AND the building is either at least 1m from any boundary OR built from substantially non-combustible materials
• Over 30m²: Building Regs approval required regardless

The 1-metre figure here (the fire-safety setback) is what people confuse with the 2-metre planning rule. They are different rules from different systems. The planning 2m rule affects permitted height. The Building Regs 1m rule affects fire safety for larger buildings. Both can apply simultaneously, and you need to read them together when planning a larger structure.

One thing Building Regs always cover, regardless of shed size: any fixed electrical installation must comply with Part P. If you are running power to the shed (lighting, sockets, a consumer unit) that work needs to be carried out by a competent person registered with a Part P scheme, or you need to notify your local building control. This applies whether the shed needed planning permission or not.

How many sheds can you have?

As many as you like, in theory. But they all eat from the same 50% allowance. There is no rule that says "one shed per garden." There is only the coverage rule, the height rule, and the position rule. A second small shed is fine if you are still under 50% combined coverage. A third one too, if the maths still works.

The practical limit most people hit is not planning law but garden space. And potentially their partner.

Scotland, Wales and Northern Ireland

The rules above apply to England. The devolved nations have their own planning frameworks and the differences matter.

Scotland applies a similar overall approach but with some useful quirks. The 50% test applies to the rear garden only, not the full curtilage. You are allowed a single small storage shed (maximum 1.5m high, 1.2m deep, 2.5m wide) even in the front or side garden, something England does not permit. In a conservation area or the grounds of a listed building, outbuildings are limited to 4m².

Wales follows broadly similar rules to England but with one crucial difference: the old four-year enforcement rule still applies in Wales. If you are in Wales and something was built four or more years ago without permission and nobody has complained, the position is different from England.

Northern Ireland has its own system under the Planning Act (NI) 2011. Permitted development for domestic outbuildings allows up to 4m in height, 2.5m eaves if within 2m of a boundary, and the building must not be within 3.5m of a rear boundary with a road. And for reasons lost to history, the regulations specifically prohibit the keeping of pigeons in a permitted-development outbuilding. You have been warned.

If you are in Scotland, Wales or Northern Ireland, check your local planning authority's guidance: the broad principles translate but the specific numbers and exceptions differ.

What happens if you get it wrong?

This is the question the forums are actually asking, dressed up as a planning enquiry.

The honest answer is: the most likely outcome if you build slightly outside the rules is that a neighbour reports it to the council. The council then issues an enforcement notice, and you have options: apply for retrospective permission, appeal the notice, or remove the structure. Councils vary significantly in how proactive they are. Most enforcement action is triggered by complaints rather than inspections.

The 2024 rule change most guides have missed: in England, the old four-year enforcement window for building operations was abolished on 25 April 2024 under the Levelling Up and Regeneration Act 2023. There is now a single 10-year enforcement window for all breaches of planning control, including sheds. If something was built after that date without permission, your local authority has a decade to act on it. Structures completed before 25 April 2024 that had already passed the old four-year window retain their immunity. This change is significant and most shed guides on the internet still say "4 years": they are wrong for anything built after April 2024 in England. Wales retains the four-year rule.

If you want certainty: a Lawful Development Certificate from your local planning authority confirms in writing that your shed is lawful. It costs around £206 in England (verify the current fee on the Planning Portal as fees are reviewed annually), takes around 8 weeks, and is useful when selling the house. It is not compulsory, but if you are sitting close to the limits or in a conservation area, it is cheap insurance.

Compact pick

4x6ft Metal Garden Storage Shed, Dark Grey

A compact shed that sits well within any standard garden's permitted development limits. Lockable door and vents included. Good for smaller gardens or plots where coverage headroom is limited.

£252.99 View this shed →

Frequently asked questions

What is the maximum size shed without planning permission in the UK?

There is no fixed maximum floor area in England under permitted development rules. The real limits are: all outbuildings combined must not cover more than 50% of the land around the original house; the shed cannot be taller than 2.5m if within 2m of a boundary (or 3m/4m depending on roof type if further away); and it cannot sit in the front garden. The commonly quoted 15m² figure belongs to Building Regulations, not planning law.

How close to the boundary can I put a garden shed?

There is no minimum distance from the boundary in planning law. You can build right up to the fence. However, if any part of the shed is within 2m of a boundary, the maximum overall height drops to 2.5m regardless of roof type. Practically, leaving at least 50cm for maintenance access is strongly advisable.

Can I put a shed in my front garden?

Almost certainly not under permitted development. No outbuilding is permitted development "forward of a wall forming the principal elevation", which in practice means the front garden. If you want a shed, bike store or any other outbuilding in the front garden, you will need to apply for planning permission, and there is no guarantee it will be granted.

Do I need planning permission for a shed with electricity?

Planning permission and electrical work are separate questions. The shed itself may be permitted development without needing planning permission. However, any fixed electrical installation, sockets, lighting, a consumer unit, must comply with Part P of the Building Regulations regardless. That means the work must be done by a registered competent person or notified to your local building control.

Does a shed need building regulations approval?

Usually not, if it is under 15m² with no sleeping accommodation, or under 30m² and either at least 1m from any boundary or built from non-combustible materials. Over 30m², or if the shed has sleeping accommodation, Building Regs approval is required. Fixed electrical installations always need to comply with Part P regardless of size.

How many sheds can I have in my garden?

As many as the 50% coverage rule allows. There is no limit on the number of outbuildings, only on the total area they cover combined. All outbuildings plus any extensions to the house must not cover more than half the land around the original house. Each additional shed eats from the same allowance.

What is the 4-year rule for sheds?

In England, the four-year rule no longer exists. It was abolished on 25 April 2024 under the Levelling Up and Regeneration Act 2023. There is now a single 10-year enforcement window for all planning breaches, including outbuildings built without permission. In Wales, the four-year rule still applies.

Do I need planning permission for a garden shed in a conservation area?

Permitted development rights in conservation areas are restricted. Outbuildings to the side of the house often need permission, and Article 4 Directions can remove PD rights entirely. If you are in a conservation area, check with your local planning authority before you build.