Garden gyms, designed and built

CGI: a garden gym with a rack, a mirror wall, oak slats and glass doors to the garden.

Garden gyms

Train at six. Breakfast at seven.

Room for a rack, a mirror wall and glass to the garden. No drive, no queue for the bench, and a shower of your own if you want one.

Garden gyms from £42,500 incl. VAT

Design a gym in 3D Talk to us

16–36 m², drawn for your gardenEvery price includes VATOne crew, start to finish

What goes in

Built around how you train.

Room to move
From 16 to 36 m², drawn around your rack, your bench and your mirror wall.
Glass to the garden
Sliding or bifold doors, argon-filled and toughened, so the room opens on a warm morning.
A shower room
An option: £11,400 incl. VAT.
A cold plunge
An option beside the gym: £6,480 incl. VAT.
Air conditioning
An option: £2,160 incl. VAT.
Certified electrics
An IP-rated consumer unit with RCBOs and surge protection, certified by a qualified electrician.

Guide prices

What it costs, by size.

From £42,500 incl. VAT at 16 m².

Garden gym, Essential finish, western red cedar, sliding doors. Tap a size to open it in the 3D designer. These are the designer’s own figures: the lower is the design as drawn, the upper allows for what the survey might find. After the survey it becomes one fixed price, VAT included. Sizes from 16 to 36 m².
Size	Guide price, incl. VAT	On site
16 m²	£42,500 – £46,500	7 weeks
26 m²	£54,000 – £59,500	8 weeks
36 m²	£65,500 – £72,000	10 weeks

Built by KF Crafts

One we built, and how it goes up.

Ground screws, not a concrete slab: minimal digging, and far less disturbance to the garden.

Built by KF Crafts — open the full-size photograph
Garden gym under a large rooflight
Built by KF Crafts — open the full-size photograph
Ground screws: no concrete slab
Built by KF Crafts — open the full-size photograph
Cedar cladding and soffit, mid-build

See how we build, layer by layer

Options

Make it yours.

The glass, the cladding, the finish and the extras, each with its price. Everything can be changed in the 3D designer, and the price follows.

Every option for the garden gym, with its price 17

Every figure comes from the same price list as the 3D designer. “Of the building” means the structure: the building at its size and finish. What each finish and cladding means.
Option	Price, incl. VAT
3-panel sliding doors	Included
Bifold doors	Included
Frameless corner glass	+ £7,800
Western red cedar (vertical boards)	Included
Thermowood (horizontal boards)	+ 2% of the building
Charred larch (shou sugi ban)	+ 5% of the building
Anthracite composite (low maintenance)	+ 3% of the building
Essential finish	Included
Signature finish	+ 15% of the building
Bespoke finish	+ 30% of the building
Shower room	+ £11,400
Air conditioning	+ £2,160
Smart lighting & audio	+ £3,840
Covered canopy	+ £7,008
Composite deck, 12 m²	+ £5,988
Sunken hot tub with its own deck	+ £20,604
Cold plunge	+ £6,480

Planning

Usually permitted development.

A gym you use yourself goes with the house, so it is usually permitted development: single storey, behind the front of the house, no more than half the garden covered.

With a flat roof, a garden building stays within permitted development at up to 2.5 m high wherever it stands in the garden: for a flat roof the eaves are measured to the top of the roof, and the eaves limit is 2.5 m.

Over 30 m², building regulations apply; between 15 and 30 m² it depends on how close it sits to the boundary. We check your address and tell you in writing which route it takes.

How planning works, step by step

For a detached, single-storey garden building. Where approval is needed, we prepare and manage the application.
Building	Building regulations approval
Under 15 m², nobody sleeps in it	Normally not needed
15–30 m², nobody sleeps in it	Not needed if it stands at least 1 m from every boundary, or is built substantially of non-combustible materials
Over 30 m², or anyone sleeps in it (any size)	Needed

Why KF Crafts

Things you can check before you call.

5.0 on Google — read the reviews 13750347KFCRAFTS LIMITED on Companies House, since 2021 Our own workPhotographs of buildings we built, marked “Built by KF Crafts”. Renders are marked CGI. 20 yearsThe Firestone EPDM roof carries the manufacturer’s own 20-year guarantee.

Very knowledgeable, trustworthy and efficient team.

Maya · Google review

Their attention to detail, craftsmanship, and use of sustainable materials truly set them apart.

Silvie P. · garden room · Google review

We’ve used their services across a number of different properties, and have always found their communication and adaptability second to none.

Jason C. · Google review

Questions

Straight answers.

How much does a garden gym cost?

From £42,500 incl. VAT at 16 m². A shower room adds £11,400 and a cold plunge £6,480, both incl. VAT.

What about building regulations?

Building regulations generally apply to buildings over 30 m², and to any building with sleeping accommodation, whatever its size. A room with a bed is never exempt because it is small.

Smaller rooms without a bed can be exempt, depending on how they are built and how close they sit to the boundary. Where approval is needed, we manage building control for you.

How long does it take?

Typically 6–10 weeks on site, depending on size and finish; the largest annexes take a little longer. The 3D designer shows the estimate for your size.

If planning permission is needed, allow 8–12 weeks before the build for drawings and the council’s decision. Your finish date is written into the contract before you pay a deposit.

What is it like while you build?

The same crew every day, a photo from your garden on WhatsApp each working day, no work after 6pm or on Sundays, and a tidy garden every evening.

All questions

Made to measure