A garden gym is one of the best investments you can make — no memberships, no commute, no waiting for equipment. We build fully insulated, properly fitted gym buildings that are comfortable to train in year-round. Every build includes rubber flooring, dedicated electrics, and climate control as standard. We can also add mirrored walls, integrated storage, and whatever else your training setup requires.
SIPs Construction Throughout
Structural insulated panels mean your gym stays warm in winter and cool in summer — without expensive running costs.
Rubber Gym Flooring
We supply and fit heavy-duty rubber tile flooring rated for weights and gym equipment — protecting both the floor and your joints.
Mirrored Walls
Full-length mirrored wall panels on request — properly fixed and frameless, not DIY clip-on mirrors.
Dedicated Electrical Supply
Multiple circuits, RCD protection, and enough sockets for your equipment. We wire for your setup, not a generic one.
What's Included in Every Build
Fully turnkey — we handle everything. You unlock the door on the last day and walk into a finished room.
Ground screw foundations
No concrete, no excavation
SIPs panels throughout
Walls, floor and roof
EPDM or metal roof
20-year guarantee as standard
External cladding
Premium finish, 30+ year lifespan
Doors and windows
Fitted and glazed
Full mains electrical
Sockets, lighting, consumer unit
Electrical certificate
Signed and issued on handover
LED lighting
Internal and external as specified
Fully plastered interior
Smooth skim finish throughout
Fitted flooring
Laid and finished
Full site clean-up
We leave your garden spotless
10-year structural guarantee
From handover day one
Interior decorating (painting / wallpaper after plastering) is not included but can be arranged through our trusted decorator — just ask.
Ready to see what we can build for you?
Get a price in under 3 minutes, or book a free site visit — no obligation.
Garden Gym Builds
What Size Garden Gym Do I Need?
The right size depends on your training style. Here's how the most common gym setups map to room dimensions.
3 × 3m
Yoga / Pilates
- Yoga or Pilates mat
- Stretching and mobility
- Bodyweight workouts
- Meditation space
9m² — solo practice, no heavy equipment
4 × 3m
Functional Training
- Treadmill or rower
- Dumbbells and bench
- Kettlebell work
- Cardio + strength
12m² — the most popular gym size
5 × 4m
Full Power Setup
- Power rack with clearance
- Olympic barbell + plates
- Cardio machine alongside
- Two people training
20m² — space for a serious home gym
Not sure? Bring your equipment list to the free site visit and we'll work out the best dimensions together.
What's Included in Every Garden Gym
Every garden gym we build is fully turnkey — ready to train in on the day we leave.
Ground screw foundations
No concrete — installed in hours
SIPs structural insulated panels
Warm in winter, cool in summer
Heavy-duty rubber tile flooring
Rated for weights and equipment
Dedicated electrical consumer unit
Multiple circuits for equipment
5kw air conditioning unit
Heating and cooling year-round
LED lighting on dimmer
Smart switch option available
Plastered walls, ready to decorate
Mirror panels available on request
Aluminium doors and windows
A-rated glazing throughout
Most Garden Gyms Don't Need Planning Permission
Under Permitted Development rights, a garden gym is treated the same as any other garden outbuilding. Single storey, within the garden footprint limits, and no taller than 2.5m within 2m of the boundary — and no planning application is needed.
We confirm your position at the free site visit. Listed buildings, conservation areas and national parks may have different requirements — we'll tell you exactly what applies to your property.
Read our getting started guide →5.0 · 39 Google Reviews
"James and his team built the most incredible large garden room with large cedar cladding and LED strip lighting — I love having somewhere to keep all my exercise equipment and to relax. The quality and finish are second to none."
"Incredible attention to detail, customer service, materials and quality of craftsmanship. Could not be happier with what James and his team built for us and perfectly on schedule too!"
Get Your Garden Gym Quote
Use our price calculator for an instant guide price, or book a free site visit and we'll come to you.
Frequently Asked Questions
More questions? See our full FAQ →
What size do I need for a garden gym?
It depends on how you train. As a guide: 3×3m works for yoga, stretching and bodyweight training. 4×3m is the sweet spot for most people — enough for a cardio machine, a rack and free weights. 5×4m and above is needed for a full power rack with walk-around clearance, or if you want space for two people training simultaneously. We'll advise at the free site visit based on your equipment list.
Can the floor handle heavy weights?
Yes. We fit heavy-duty rubber tile flooring rated for gym use — it handles the impact of dropped weights and protects the subfloor beneath. Ground screw foundations distribute load evenly and flex with ground movement, unlike a concrete slab which can crack. If you're planning very heavy deadlifts or Olympic lifting, tell us at the design stage and we'll spec the subfloor accordingly.
How do I keep a garden gym cool in summer?
We include a 5kW air conditioning unit as standard in our garden gym spec — it both heats and cools, so you're comfortable year-round. SIPs construction also significantly reduces temperature fluctuation compared to a timber-frame shed, so the air conditioning doesn't have to work nearly as hard.
Does a garden gym need planning permission?
Most garden gyms fall under Permitted Development — the same rules as any other garden room. Single storey, not covering more than 50% of the garden, max 2.5m height within 2m of a boundary. We confirm your position at the free site visit. See our getting started guide for a full rundown.
Can I soundproof a garden gym?
SIPs construction provides excellent acoustic insulation by default — far better than a timber-frame shed. If you're planning heavy lifting with significant impact noise, we can discuss additional acoustic measures. For most gym uses — cardio, free weights, fitness classes — the standard build is more than adequate and your neighbours won't hear a thing.
Can the gym be used for anything else?
Absolutely. Many of our garden gym customers design the space to double up — gym in the morning, yoga or Pilates studio in the evening, or a general multi-use room with easy-clean rubber flooring. With bifold doors and the right lighting, it also works as an entertaining space. We'll help you design around multiple uses if that's what you're after.
What Makes Us Stand Out
Every Green Rooms build uses the same premium specification — regardless of price point.
Full ComparisonSIPs Construction
Structural Insulated Panels — far superior insulation, strength and soundproofing compared to timber frame. Warm in winter, cool in summer.
30+ Year Cladding
Thermo Ayous, Cedar, Charred Spruce, Hardie Plank, Millboard or Thermo Ash. Every material chosen for longevity. No Redwood, ever.
20-Year Roof Guarantee
EPDM or metal panel on every build — never felt. Both carry a 20-year guarantee as standard.
Fully Turnkey Service
Foundations, structure, cladding, glazing, electrics, flooring, plastering, and site clean-up all included. We hand the keys over on the last day — you walk into a finished room.
Electrical Sign-Off
Mains-connected consumer unit, full testing, and a signed electrical certificate included on every single build.
Built in 2–3 Weeks
Our experienced team of carpenters complete most builds within 2–3 weeks from start to handover.
Ready to Get a Price?
Use our instant calculator to design your garden gyms surrey and get a guide price in under 3 minutes. No email required to see your estimate.
