Drawing on the design mastery of nature, the Firma Shell is a beautifully organic structure that offers superior comfort while blending seamlessly with the landscape. The cleverly designed shell system ensures the Firma Shell is strong and steady while needing no internal support. Inside, this means freedom of space and uninterrupted views into the wilderness beyond, while reducing the footprint on your land.

Tims daughter enjoying the Firma Shell

“An amazing structure and space to be in – a modern take on how we remember camping.”

Tim Bullen
Firma Shell Owner, The Secret Campsite


With demand for glamping holidays reaching new heights and the range of accommodation options growing steadily with it, it’s critical to make the right choice now to ensure your future success. Knowing this, we design and create accommodation solutions that will help you stand out from the crowd and deliver a world-class experience for your guests.

Inspired by nature
Stand out from your competitors not the landscape. The beautiful, organic shape of the Firma Shell blends seamlessly with the environment ensuring it complements the view, rather than interrupting it.

Warm, dry and comfy
Superior water-proofing technology and a breathable, double layer skin combines with 100% British wool insulation to ensure things stay warm and toasty in winter and cool and dry in summer.

Maximum occupancy
Why choose form over function when you can have both? The Firma Shell’s unique design allows flexibility in sleeping arrangements. Create a spacious room for two or a cosy party for a family of five – with enough room left to swing a cat!

Unbeatable return
Combining a superior experience with a unique and memorable design, the Firma Shell commands premium per night prices and repeat bookings. This will see a well run unit return a profit in as little as 12 months, with an ROI of over 500%.


We believe there is nothing like the power of the outdoors to recharge and rejuvenate. We are woodland warriors passionate about sharing authentic experiences and enabling adventure that doesn’t cost the earth. Like our own well-being, our woodlands need to be protected and this ethos drives everything we do from strategy to installation.

Knowing where our materials come from ensures they are responsibly and locally sourced, 100% recyclable and of the highest quality.

Each structure is built bespoke, by experts in the UK, using a clever modular system that allows damage to be repaired rather than the entire structure needing to be replaced.

By delivering structures that are prefabricated and flat-packed we dramatically reduce their carbon footprint in production, transport and installation.

Having reduced our footprint as much as possible, we then partner with community projects to fund the planting of new trees where they’re needed most.

We’ve got lofty goals so we’ve partnered with sustainability experts to help us to be the best we can be for our environment.

Two year guarantee on the main structure

Full support and a comprehensive user guide

Proudly designed and manufactured in the UK

Insurability and safety checked



Our structures are made bespoke which means they are tailored to your site, needs and budget and you never pay for things you don’t need.

We start with the basics as standard:
Structural frame
Outer shell
Two skylights
A fully glazed front entrance
Hinged door
Standard high quality interior liner

From £13,995


Fancy a whacky colour? A practical floor covering that is easy to clean between guests? We then offer a range of extras that will enhance your glamping experience and help you make it your own. Pick and choose from the list below, or get in touch to discuss your ideas, we believe there is a clever design solution for every need!

Exterior and interior fabric colours and finishes

Number and placement of skylights

Micro wood-fired stove

Protective winter cover

Premium quilted 100% melton wool thermal lining

Multi-foil thermal insulation

Sustainable wool cushion and blanket pack

LED lighting kit

Rechargeable battery pack charging points

Expert installation assistance

International shipping

  • Exterior in a range of colours and finishes

  • Micro wood-fired stove with flue and heat proof backing

  • Multi-foil insulation

  • Custom branding

    Askersund Outdoor branding on their Tree Tent
  • Premium 100% melton wool lining in grey

  • Premium 100% melton wool lining in red

  • Custom made cushions for seats and beds

  • Number and placement of skylights

    Inside the Firma Shell
  • LED lighting kits

  • Expert installation assistance

Discover a new future for your site now

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