Affordable timber building annexes and extensions
Modular timber buildings tailored for flexibility, functionality, and fast installation.
Your Personal Space, Built Around You
4.8/5 Stars
from 50+ Reviews
Why Browns Timber Buildings?
FSC® certified timber & carbon neutral
Built-to-order in our UK factory
Delivered and installed nationwide
Fully insulated & usable all year round
Affordable alternative to traditional extensions and annexes
At Browns Timber Buildings we offer an affordable alternative to traditional bricks-and-mortar building extensions and self-contained annexes. Create more living space in your home by increasing your existing layout.
Our customers use our extensions and annexe buildings for:
- Increasing existing living space in the home
- Self-contained living space for extended family
- Accommodation for elderly family members
- Additional work space for remote working
- Home gyms and yoga retreats
Extensions and Annexes by Browns
Our team works with you to create a space that suits you — from layout and lighting to glazing and access. You can customise your space with optional heating, air con, electrical specification, storage and more.
Starting from just £17,099 including VAT
It’s the perfect solution to building an extension. Much less expensive, achieves the same result and in a fraction of the time. I have much more flexibility over how it looks, too!
— Luke Duncan
Annexes – Built and Installed by Browns
Our client wanted a self-contained annexe as living accommodation for his elderly parents so they could be close by. Browns Timber Buildings planned and designed a space that met the need, building and installing within 2 weeks – including kitchen and bathroom spaces.
Installed over 14 days, the annexe now comfortably accommodates the clients parents, situated on the grounds of his home.
Recently installed by Browns
Got questions? We’ve got the answers.
Here are some of the most common questions we get about our timber building extensions. If you can’t find what you’re looking for, feel free to get in touch — we’re always happy to help.
Q: Do I need planning permission for an extension?
A: In most domestic settings, no – if your footprint is within a specific size. Our buildings are designed to comply with permitted development rules. We’ll guide you through anything that might need consent.
Q: Can you include power, heating, and internet?
A: Yes — we can handle full electrics and advise on heating solutions. Internet can be wired or extended from your home router.
Q: How long does installation take?
A: Most of our builds are completed in 2–3 weeks depending on size and ground conditions.
Ready to create your bespoke space?
Whatever you’re looking to achieve, we will work with you to get there on time and within budget.
Get in touch today – we will get back to you as soon as we can.