Key Takeaways -

• Most greenhouses are permitted development, but size, height, and location restrictions apply.
• Planning permission may be required in protected areas or for listed buildings.
• Temporary greenhouses usually don’t need approval, but attached or multiple greenhouses may.
• Always check with your LPA to ensure compliance.

A greenhouse is a great way to grow plants all year round, protect them from bad weather, and extend the growing season. In most cases, you don’t need planning permission to put one in your garden, but there are some rules to follow.

This guide will explain when planning permission is required, what size and height limits apply, and what to do if you live in a protected area. It will also walk you through the steps to check with your local council and apply if needed.

Keep reading to find out whether you need permission for your greenhouse and how to make sure it meets UK regulations. Understanding these rules before you start can help you avoid delays and make the process hassle-free.

Greenhouse Planning Permission in the UK

Most greenhouses in the UK do not need planning consent, as they fall under permitted development rights. However, there are specific rules regarding size, height, and location that must be followed. If these limits are exceeded or if the property is in a protected area, planning permission may be required.

It’s important to check with your local planning authority (LPA) before building, especially if your greenhouse could impact neighbours or the surrounding environment.

Permitted Development Rights for Greenhouses

Greenhouses are considered permitted development if they meet certain conditions. The maximum height allowed is 4 metres for a dual-pitched roof and 3 metres for other roof types. If placed within 2 metres of a boundary, the height limit is reduced to 2.5 metres.

The greenhouse must not cover more than 50% of the land around the original house. It also cannot be placed in front of the house and must be used only for domestic gardening or storage for gardening tools, not for business or living space.

Conservation Areas & Areas of Outstanding Natural Beauty

If your property is in a conservation area or an Area of Outstanding Natural Beauty (AONB), additional planning rules may apply. Local authorities often place restrictions on greenhouse size, materials, and placement to preserve the character of the area.

Even small greenhouses that would normally be permitted elsewhere may require approval. If you live in a designated land, it is essential to check with your local council before starting any construction.

Listed Buildings

If your home is a listed building, you will likely need Listed Building Consent before adding a greenhouse. Strict regulations are in place to protect historic properties, and even minor changes may require approval.

The placement, design, and materials of the greenhouse must match the historical character of the property. Failure to obtain permission can result in legal issues, fines, or a requirement to remove the structure. Always consult your local authority before building near or on the grounds of a listed property.

National Parks & Protected Land

Homes located in National Parks, World Heritage Sites, or other protected areas face additional restrictions. Greenhouses built more than 20 metres from the house may be limited to a maximum area of 10 square metres. In some cases, permission may be required regardless of size.

If the property is within a protected landscape, such as a National Park or The Broads, the greenhouse must be carefully positioned to minimise environmental impact. Always check with the local planning authority to ensure compliance.

Applying for Planning Permission for a Greenhouse

How to Check If You Need Permission

Before applying, check if your greenhouse falls under permitted development. The best place to start is the Planning Portal website, which provides guidance based on your location. You can also contact your LPA to confirm if permission is required.

If you want official proof that your greenhouse complies with regulations, you can apply for a Lawful Development Certificate (LDC). This certificate is not mandatory but can provide peace of mind.

Steps to Apply for Planning Permission

1. Gather required documents (drawings, site plan, measurements)
2. Complete the application form (via the local council website)
3. Pay the application fee (varies by location)
4. Await review by the local council
5. Receive a decision (typically within 8 weeks)

Retrospective Planning Permission

If you have already built a greenhouse without planning permission, you may need to apply for retrospective approval. The LPA will review the structure to determine if it meets regulations (1). If permission is refused, you may be required to make alterations or remove the greenhouse altogether.

Ignoring planning rules can lead to enforcement action, so it’s always best to check requirements before building.

Other Considerations for Garden Buildings

Greenhouses vs. Garden Sheds & Other Structures

Greenhouses, garden sheds, and summerhouses all fall under permitted development, but the rules can vary.

Greenhouses are typically allowed without planning permission, while larger sheds and summerhouses may face additional restrictions, especially if used as a workspace or guest accommodation. Always check with your LPA to confirm the regulations for different structures before building.

Building Regulations for Greenhouses

Most domestic greenhouses do not need to follow building regulations, but exceptions exist. If your greenhouse is larger than 30m², you may need approval to ensure it meets safety and structural standards.

Similarly, if you install electrical wiring or plumbing for heating, lighting, or irrigation, you must comply with regulations covering fire safety and electrical safety. Always check with your local council if your project involves these features.

Impact on Neighbours & Property Boundaries

Placing a greenhouse too close to property boundaries may cause disputes, particularly if it blocks light or creates drainage issues. Keeping a reasonable distance from fences and walls can help prevent problems.

If your greenhouse is likely to impact your neighbour’s view or overshadow their garden, it’s best to discuss your plans with them first. Good communication can help avoid objections and ensure a smooth building process.

Frequently Asked Questions

Do I Need Planning Permission for My Greenhouse That Has a Dual-Pitched Roof?

A dual-pitched roof greenhouse is permitted development if it’s under 4 metres high. If placed within 2 metres of a boundary, the height limit is 2.5 metres. Exceeding these limits or building in a protected area may require planning permission. Check with your LPA to confirm local rules.

Can I Attach a Greenhouse to My House Without Planning Permission?

Attaching a greenhouse to your house may count as a house extension, which could require planning permission. If it significantly alters your home’s appearance or exceeds permitted development limits, approval is likely needed.

Rules vary by council, especially for listed buildings or conservation areas. Always consult your LPA before building.

Do I Need Planning Permission for a Greenhouse on an Allotment?

Greenhouses on allotments may be allowed under permitted development, but rules vary by local council. Larger structures or those in protected areas may need approval. Some lease agreements also have restrictions. Check with your allotment association or council before building.

Do Temporary or Portable Greenhouses Need Planning Permission?

Small temporary greenhouses, like pop-up models, usually don’t need permission. Larger polytunnels or permanent portable structures may require approval, especially in protected areas. If the greenhouse is intended for long-term use, check with your LPA to avoid issues.

Can I Build Multiple Greenhouses on My Property?

You can build multiple greenhouses, but they must not cover over 50% of your garden. Each must meet permitted development limits for height and placement. If in a protected area or exceeding these rules, planning permission may be needed. Always confirm with your LPA before building.

Conclusion

A greenhouse is a great way to create a controlled environment for growing plants, and in most cases, you won’t need planning permission. However, size, height, and location restrictions apply, especially in protected areas or if your property is listed.

Checking with your LPA before building can help you avoid any legal issues. By understanding the rules in advance, you can enjoy your greenhouse with peace of mind and focus on growing a thriving garden.

Sources -

1. https://urbanistarchitecture.co.uk/retrospective-planning-permission/