No. 01
Built for year-round comfort.
Our engineered SIP construction combines structural strength with outstanding thermal performance, creating a comfortable space in every season.
Warm in winter. Cool in summer. Efficient all year round.
Premium garden rooms
without the premium price tag.
Pricing from £11,995
No. 01
120mm PIR Roof · 90mm Walls
Year-round thermal envelope
No. 02
uPVC Double-Glazed Glazing
Aluminium available as upgrade
No. 03
Premium Timber Cladding
Curated exterior palette
No. 04
10-Year Structural Warranty
Underwritten by Arden & Oak
Why us
A better way to build a garden room.
Most garden rooms follow the same formula — a basic timber structure with everything else added later.
We do things differently.
Every Arden & Oak building is designed as a complete, high-performance space from the outset, using structural insulated panel technology, ventilated wall construction and premium materials throughout.
Built to perform. Designed to last.
No. 02
Designed as a complete building.
Every Arden & Oak room is supplied as a finished space, not a basic shell. Premium internal finishes, considered layouts and practical design come as standard.
Ready to use from day one.
No. 03
Transparent pricing.
No showrooms. No commissioned salespeople. No hidden extras.
Just clear advice, honest pricing and straightforward communication from enquiry to handover.
No. 04
Tailored, not complicated.
Every building is configured around how you want to use the space. Choose from our collection, then personalise glazing, finishes, layouts and upgrades where it matters most.
Simple to understand. Flexible where it counts.
A more thoughtful approach — from the structure to the final detail.
Reasons to choose us
Six reasons clients choose Arden & Oak.
Price Match Promise
If you receive a genuine like-for-like written quotation using equivalent specifications, insulation levels, glazing and finishes, we'll match it and aim to beat it.
Premium quality shouldn't mean paying more than necessary.
SIP Engineered Construction
Unlike traditional timber stud walls, our buildings utilise structural insulated panels to provide superior strength, rigidity and thermal performance.
Built stronger from the inside out.
Ventilated Wall System
Our external wall construction incorporates a ventilated rainscreen cavity behind the cladding. This allows airflow, reduces moisture retention and improves the long-term durability of the building.
Premium Internal Finish
Every building includes a painted birch ply interior finish as standard. Durable, attractive and ready for everyday use.
Plasterboard and skim options are available for customers wanting a traditional room finish.
Planning Guidance
Most Arden & Oak buildings fall within permitted development guidelines. We provide guidance throughout the process and can assist with planning applications where required.
Single Point Of Contact
From initial consultation to completion, you'll deal with the same project lead throughout your journey.
Simple communication. No handovers. No confusion.
Specification
What’s actually behind the cladding.
- 01
122mm Structural Insulated Panels (Walls)
Engineered SIP construction featuring OSB skins bonded to a PIR insulated core.
- 02
High Performance SIP Roof System
Superior thermal performance combined with premium EPDM waterproof roofing.
- 03
Ventilated Rainscreen Construction
Counter-battened wall system allowing airflow behind cladding.
- 04
Premium Exterior Cladding
Available in Redwood, Thermowood, Cedar and selected architectural finishes.
- 05
High Performance Double Glazing
Premium uPVC glazing as standard with aluminium upgrades available.
- 06
Premium Painted Birch Ply Interior
A durable, attractive finish included as standard.
- 07
Electrical Ready Design
Designed for straightforward electrical installation with concealed service zones.
- 08
Year-Round Thermal Comfort
Far superior thermal performance compared with many traditional timber-frame garden rooms.
A fair comparison
Compare the structure, not just the price.
Traditional garden room
Built to a budget.
- —50mm timber stud wall
- —50mm insulation
- —Internal melamine finish
- —Limited thermal performance
- —Basic wall construction
Arden & Oak
Built to a standard.
- +122mm SIP wall construction
- +90mm PIR insulated core
- +Ventilated rainscreen cavity
- +Premium painted birch ply interior
- +Superior thermal efficiency
- +Greater structural strength
When comparing quotations, ensure you’re comparing equivalent specifications.
Many buildings may appear similar externally, but the construction behind the cladding can differ dramatically.
Featured Project
The Pavilion — Surrey
A two-volume garden room designed for work, leisure and evening use — combining a private bar, games lounge and quiet office under one thermally efficient roofline.
PRJ.014 — Surrey, United Kingdom — 8.4 × 4.6 m · 38 m²
View case study →The same building, four worlds
One building. Any garden.
Every Arden & Oak room is drawn around your aspect, your planting and your light. The architecture stays disciplined — the world around it changes.
Scene 01
Suburban dusk
A flat-paved patio, mature beech behind, soft warm dusk. The Mono as we delivered it.
Scene 02
Japanese gravel — dawn
Pale silver gravel, a single Japanese maple, blue-hour stillness. The same envelope, recast as a meditation studio.
Scene 03
Coastal headland — noon
Beach grasses leaning in the wind, sea-pebble gravel underfoot, distant horizon. A working studio that earns its view.
Scene 04
Heather moorland — late afternoon
Low purple heather, weathered granite, a single rowan. The same architecture, somewhere quieter.
Why Arden & Oak
Six quiet reasons
our clients stay with us.
No. 01Read more→
Ten-year warranty
Structural, weathertight and electrical first-fix covered in writing.
No. 02
Built in the United Kingdom
Designed and manufactured in our Devon workshop.
No. 03Read more→
High-standard insulation
120mm roof and 90mm wall PIR for year-round comfort.
No. 04Read more→
Bespoke, never off-the-shelf
Every project is drawn for its garden, aspect and owner.
No. 05Read more→
Planning guidance
Most of our buildings fall within UK permitted development, meaning formal planning permission is often not required.
No. 06Read more→
One studio lead
A single point of contact from first call to handover.
The Collection
Three refined spaces,
designed around how you live.
Each typology is fully bespoke — drawn for its garden, its aspect and the way you want to work, train or unwind.
See all 13 models →
Work01
Garden Offices
A calm, insulated workspace designed for focus, daylight and year-round comfort.
From £46,000Explore →
Wellness02
Garden Gyms
Private wellness spaces with reinforced flooring, climate control options and a clean architectural finish.
From £52,000Explore →
Studio · Living03
Garden Studios
Flexible garden rooms for creativity, guests, relaxation or multi-use living.
From £42,000Explore →
Specification
Detailed to a high standard.
Every unit is built around an engineered timber frame and insulated to a high standard — warm in winter, cool in summer and sealed against the British weather.
Materials
A curated palette of exterior finishes, selected for durability and architectural impact.
View material palette →- 0190mm PIR insulation
- 02120mm PIR insulation
- 03Premium exterior cladding
- 04High-performance uPVC double-glazed doors & windows
- 05EPDM or Sedum roof
- 06Plasterboarded interior
- 07Electrical-ready design
- 08Year-round comfort
Practice
02 — Manifesto
We build a small number of garden rooms each year. Each one is drawn from its site, detailed like a home, and delivered by a single, calm team — because a quiet room in a considered garden should feel the way it sounds: inevitable.
Projects
240+
Completed across the United Kingdom since 2014.
Lead time
10 wks
From site survey to hand-over.
Warranty
10 yr
Structural & weathertight guarantee, in writing.
In their words
“It is, without question, the most considered piece of work any tradesperson has done on our home. The detail is quietly extraordinary.”
Clare HarringtonPrivate client, South Devon
Worth knowing
A well-built garden room doesn’t just earn its place. It adds value to your home.
A fully insulated garden room typically adds 5–15% to UK property value — often £15,000 to £100,000+ — and homes with one consistently sell faster.
Read · Does a garden room add value?→Begin
Start your garden
room project.
Tell us how you want to use the space and we’ll help shape the right design, specification and finish. A studio lead will reply within two working days.