Planning An Annexe in the Garden? Here’s What You Need to Know
With over 40 years of experience crafting bespoke timber buildings, we’ve witnessed a significant surge in the popularity of garden structures. The trend shows no signs of slowing down, with the hashtag #gardenbuildings now amassing over 30,000 posts on Instagram. Among these, garden annexes are becoming a top choice for homeowners looking to expand their living space—whether to accommodate elderly parents, adult children, or other relatives, add value to their property, or even generate rental income. As sustainable, versatile, and attractive solutions, it’s easy to see why timber annexes are so popular.
Successfully building a garden annexe requires a clear understanding of the planning, design, and construction process. In this article, we’ll guide you through everything you need to know to create an annexe in the garden that perfectly balances aesthetics, functionality, and your unique needs.
What Is An Annexe?
So, what makes an annexe, an annexe?
It is always important to clarify what we mean by ‘annexe’ as in the world of garden buildings, the term can be used an umbrella term for many kinds of structures.
Lee Taylor, Managing Director of National Timber Buildings explains:
“Imagine you have a main house where you live, but there's an extra part of the property that's like a "mini home" connected to or near your main house. This could be a space with its own bedroom, bathroom, or even a small kitchen. It might be connected to your home by a door or hallway, or it could have its own entrance from the outside.
Now, even though this space might feel separate, it’s still part of the same overall property and is used as extra living space for your family, guests, or even relatives who want a little independence (like grandparents or adult children). When a space like this is part of your main property and used in this way, it’s called an annexe.
Think of an annexe as a bonus living area that’s part of your home, just with a bit of its own personality and function!”
Why Build An Annexe In The Garden?
A garden annexe is the perfect solution for multigenerational living or accommodating guests when your main house has reached its capacity. However, beyond providing extra living space for family and visitors, an annexe offers a range of practical benefits:
- Rent it out as a short- or long-term let to create a steady revenue stream.
- Add significant value to your home with the appeal of extra living space.
- Provide comfortable accommodation for live-in caregivers.
- Plan ahead for changing family needs or downsize into the annexe in later years.
Thanks to their versatility, garden annexes can also evolve with your needs. When additional accommodation is no longer required, they can be transformed into hobby rooms, gyms, storage spaces, home offices, or even a tranquil retreat for relaxation.
Do You Need Planning Permission For An Annexe In The Garden?
Yes, in most cases, you will need planning permission to build an annexe in your garden in the UK. However, whether you need to seek permission will depend on the specifics i.e. how the annexe will be used, its size, and its location. Let’s take a closer look at the considerations:
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Use of the Annexe
If the annexe is for a family member (e.g. elderly parents or adult children) and is strongly associated with the main house, it is more likely to be considered “ancillary accommodation.” Planning permission is usually required, but it’s easier to obtain since it’s not treated as a completely separate dwelling.If the annexe is designed as a separate, self-contained unit (e.g. with its own kitchen and entrance) and could be rented out or used independently, it is classified as a separate dwelling, requiring full planning permission.
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Permitted Development Rights
Some garden structures can be built under Permitted Development (PD) rights, meaning planning permission is not required. However, these rights are generally for non-habitable structures like home offices or sheds. A habitable garden annexe typically exceeds PD allowances, especially if it includes sleeping, cooking, or bathroom facilities. -
Building Regulations
Regardless of planning permission, all annexes must comply with Building Regulations to ensure safety and structural integrity. This includes aspects like insulation, ventilation, and drainage. -
Key Restrictions
You are more likely to need planning permission if:The annexe is large or exceeds a height of 2.5m near boundaries.
Your property is in a designated area (e.g., conservation area, National Park, or an Area of Outstanding Natural Beauty).
The annexe is built in the garden of a listed building. -
Consult Your Local Authority
We would always recommend checking with your local planning authority (LPA) to confirm what is required for your specific project. Rules can vary between councils and not checking is not worth the risk. Building without consent can leave you open to fines, invalid insurance, or even enforcement action.Briefly, while small, ancillary structures might fall under Permitted Development, most garden annexes designed for living purposes will require planning permission. To avoid complications, always consult professionals and your local council before starting your project. As experienced professionals in building timber structures, we are able to assist customers with navigating planning permission to ensure compliance with local regulations. We will even manage the whole planning process for you if you prefer.
Choosing The Right Design And Materials
When it comes to building an annexe, timber stands out as the perfect material—versatile, durable, sustainable, and undeniably beautiful. A bespoke timber annexe offers complete customisation, allowing you to design a structure that meets your unique needs while blending effortlessly with your garden. For instance, you might opt for an open-plan layout to create a multifunctional space—such as a home office combined with living quarters—over a more traditional closed-room design.
Choosing sustainably sourced timber, like the materials we use, makes your annexe an eco-friendly option. We’re committed to protecting the planet by recycling every piece of leftover material and planting four trees for every single one we use in our projects.
Timber garden annexes are also a cost-effective alternative to traditional brick-and-mortar extensions. Timber materials and labour tend to be more affordable, and the faster construction process helps keep costs down. Additionally, timber’s natural energy efficiency provides long-term savings on heating and cooling, making it a practical and sustainable choice for expanding your living space while staying within budget.
Construction Process: What To Expect
Our typical process for building a timber annexe in the garden, is as follows:
- Initial consultations: This is where we will thoroughly understand the client’s needs and conduct a site assessment.
- Design phase: We dedicate time to the design process so we can customise the annexe to fit the space and intended use.
- Planning and approvals: When the client has approved the design, planning permission is sought if needed. We can manage this entire process for a client if desired as well as assist with any necessary paperwork.
- Construction: When planning permission has been granted, we will begin manufacturing the parts in our UK based workshop using high-quality, tanalised timber and expert craftmanship for a seamless build. We will then send a team to site to erect the structure.
- Finishing touches: After our team has completed the build and left site. The client is free to install utilities and decorate the interiors as they please.
Our team focus and quality, efficiency, and accuracy throughout the entire project and liase with the client at every stage in the process.
Why Choose National Timber Buildings For Your Timber Annexe In The Garden?
With over 40 years of experience and a commitment to exceptional craftsmanship, National Timber Buildings is your trusted partner for creating the perfect timber annexe for your garden. As proud members of Made in Britain, we uphold the highest standards of British manufacturing, ensuring you receive a bespoke, high-quality product designed and built to last. Supporting us means supporting local business and promoting sustainable British artisanry.
Our expertise in crafting sustainable, eco-friendly timber buildings sets us apart. Every project we undertake reflects our dedication to quality and environmental responsibility, giving you peace of mind that your annexe will not only look stunning but also stand the test of time.
Don’t just take our word for it—explore our case studies and gallery to see the beautiful, functional spaces we’ve created for satisfied customers across the UK. Let us bring your vision to life with a timber annexe that enhances your home and garden.
Ready to create your perfect annexe in the garden? We’re here to help you every step of the way. Contact us today for a free consultation!
FAQs about Garden Annexes
1. How Big Can The Annexe Be?
The size of your annexe can be tailored to your specific needs and available garden space. Whether you’re looking for a compact, functional design or a spacious, multi-room layout, we can create a bespoke structure that meets your requirements while adhering to any relevant planning regulations.
2. Can It Have A Kitchen And Bathroom?
Absolutely! Many of our timber annexes are designed to include fully equipped kitchens and bathrooms, making them ideal for independent living spaces. We work closely with you to ensure all utilities and layouts are integrated seamlessly into the design.
3. How Long Does Construction Take?
Construction times vary depending on the size and complexity of the annexe. However, timber buildings are generally much quicker to build than brick-and-mortar alternatives. Most projects can be completed within a week, minimising disruption to your property. Usually, delivery time is around 5 to 6 weeks although this can increase to 7 weeks during the summer months.
4. How Much Does A Timber Annexe In The Garden Cost?
The cost of a timber annexe depends on factors like size, design, features, and finishes. Timber annexes are a cost-effective alternative to traditional brick-built structures, offering excellent value for money without compromising on quality or durability.
5. Why Choose A Timber Annexe Over Brick-Built Structures?
Timber annexes are not only more affordable in terms of materials and labour, but they also save time during construction. Additionally, timber is naturally energy-efficient, reducing heating and cooling costs over time. Their sustainability, aesthetic appeal, and functionality make them a smart, budget-friendly choice for expanding your living space.
