Your Complete Guide to Building a Granny Annexe in 2026 with Mobile Annexe Ltd
Updated: Sep 24
At Mobile Annexe Ltd, we know that adding a granny annexe to your home is more than just building extra space — it's about creating comfort, independence, and a happy home for your loved ones. Whether you're in Hertfordshire, Essex or surrounding areas, our garden annexes are designed to fit seamlessly into your outdoor space while providing everything you need for everyday living.
In this guide, we'll walk you through everything from planning and design to costs and practical tips, so you can see exactly how simple it can be to add a granny annexe to your garden.
What is a Granny Annexe?
A Granny Annexe is a self-contained living space in your garden. Think of it as a mini home for a relative or guest, complete with:
A bedroom
A bathroom
A kitchen or kitchenette
A lounge/dining area
It’s designed for comfort, independence, and convenience, all within the safety of your own property.
Why Choose a Garden Annexe?
We see so many families benefit from garden annexes in South East England. Here’s why:
Stay Close, Stay Independent - Your loved ones enjoy their own space while staying near family.
Cost-Effective - It’s often far more affordable than assisted living options over time, with prices starting from around £80,000.
Adds Value to Your Home - A well-built annexe can increase your property’s worth.
Flexible Living - Later, the space can become a home office or guest accommodation, giving your garden long-term flexibility as your family's needs change.
Planning & Regulations
We know navigating planning rules can feel complicated, but we guide every client through it.
The Caravan Act — Most of our annexes are built under the Caravan Sites and Control of Development Act, meaning you'll typically only need a Certificate of Lawful Development rather than full planning permission. We manage this application on your behalf, with a 99% success rate securing approval for our clients.
Building Regulations — Every annexe is built to conform to all relevant building regulations, regardless of the planning route.
Accessibility — If your annexe is for an elderly relative, features like level-access showers and wider doorways are worth considering from the outset.
At Mobile Annexe, we handle all the tricky bits, so you wont need to worry.
Designing Your Granny Annexe
Our goal is to make your Granny Annexe stylish, practical, and comfy. Here’s a snapshot of what we consider:
Features | What We Focus On | Mobile Annexe Tips for Hertfordshire & Essex |
Size & Layout | Comfortable, efficient, tailored to your garden | Make the most of your outdoor space |
Kitchen | Custom designed and fully functional | Fitted units save space and look modern |
Bathroom | Accessible and practical | Wet rooms are ideal for older family members |
Living Area | Light and airy | Big windows to let in natural light |
Exterior Design | Matches your home & garden | Choose materials that blend with surroundings |
Heating & Insulation | Warm and energy-efficient | Keeping you warm even in the depths of winter |
Curious exactly what goes into the build itself — the timber frame, insulation, foundations and more? See our full How We Build guide for the details.
Why Choose Mobile Annexe Ltd?
We don't just build garden annexes, we build peace of mind. From your first call to the day your annexe is ready to use, we're with you every step of the way. Families in Hertfordshire and Essex trust us to deliver annexes that are practical, stylish, and perfectly suited to their needs.
If you're ready to create a granny annexe that your family will love, Mobile Annexe Ltd is here to make it happen. Let's turn your garden into a beautiful, functional living space.
Ready to get started? Get in touch with Mobile Annexe Ltd for a free consultation. We build across Essex, Hertfordshire and the rest of the UK, with granny annexes and garden annexes starting from around £80,000.
📞 07770 365734 ✉️ enquiries@mobileannexe.com
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