6 × 3 m
18 m² external footprint
From £22,500Base building guide- Natural cedar
- Sliding doors
- Open interior layout
- Decking, canopy & extra glazing optional
Bespoke by Cedar Spaces
Garden Gyms
Your training. Your space. Your time.
Base guide from £9,4003 × 2.5 m starting footprint · VAT-registered business · specification by quotationPhotograph 1 of 3: 5m x 3m Garden Gym with Black Composite Cladding
Meet your garden gym.
Make room for the routine that matters. A private training space, built around your equipment and the way you move.
Discover what makes it a Cedar Space
Bespoke Garden Gyms in Hertfordshire & North London
A garden gym should feel like a place you genuinely want to train — private, motivating, comfortable, and built to perform all year round. Not a cold shed with a treadmill. Not a compromised spare room. And not a short-term solution that quickly becomes unused.
At Cedar Spaces Garden Rooms, we design and build bespoke garden gyms from our base in Harpenden, serving homeowners across Hertfordshire and North London. Our garden gyms are created for people who want to train consistently, in comfort, with proper space, durability, and privacy — without leaving home.
Every garden gym we build is designed from scratch, engineered for year-round use, and delivered as a complete, finished space — not a kit, not a shell, and not a compromise.
A clearer starting pointFind your size.
Find your size.
Shape your space.
Three starting footprints, each ready to make your own. These are base building guides, with your final specification priced individually.
5 × 4 m
20 m² external footprint
From £25,000Base building guide- Natural cedar
- Sliding doors
- Open interior layout
- Decking, canopy & extra glazing optional
7.5 × 4 m
30 m² external footprint
From £37,500Base building guide- Natural cedar
- Sliding doors
- Open interior layout
- Decking, canopy & extra glazing optional
Calculated from Cedar’s published £1,250/m² starting rate, rounded up to the nearest £100. These are guides, not fixed installed offers. Cedar Spaces is VAT registered. Your written quote will set out the VAT breakdown, final specification, foundations, services, delivery, installation and upgrades. Furniture and specialist equipment are not included. The customiser shows the same base guide and a separate illustrative options total.
Compare more sizes & pricesChoose a footprint to open that exact size in the customiser.
Base building guides for gym & studio concepts. Width runs across the front; depth runs from front to back. Figures use external room dimensions, not usable internal floor space.
Scroll across the table to see every depth.
| Width / depth | 2.5 m deep | 3 m deep | 3.5 m deep | 4 m deep | 4.5 m deep | 5 m deep |
|---|---|---|---|---|---|---|
| 3 m wide | £9,400 | £11,300 | £13,200 | £15,000 | £16,900 | £18,800 |
| 3.5 m wide | £11,000 | £13,200 | £15,400 | £17,500 | £19,700 | £21,900 |
| 4 m wide | £12,500 | £15,000 | £17,500 | £20,000 | £22,500 | £25,000 |
| 4.5 m wide | £14,100 | £16,900 | £19,700 | £22,500 | £25,400 | £28,200 |
| 5 m wide | £15,700 | £18,800 | £21,900 | £25,000 | £28,200 | £31,300 |
| 5.5 m wide | £17,200 | £20,700 | £24,100 | £27,500 | £31,000 | £34,400 |
| 6 m wide | £18,800 | £22,500 | £26,300 | £30,000 | £33,800 | £37,500 |
| 6.5 m wide | £20,400 | £24,400 | £28,500 | £32,500 | £36,600 | £40,700 |
| 7 m wide | £21,900 | £26,300 | £30,700 | £35,000 | £39,400 | £43,800 |
| 7.5 m wide | £23,500 | £28,200 | £32,900 | £37,500 | £42,200 | £46,900 |
| 8 m wide | £25,000 | £30,000 | £35,000 | £40,000 | £45,000 | £50,000 |
Indicative prices, not installed quotations. Cedar Spaces is VAT registered. Your quote will show the VAT breakdown, delivery, installation, foundations, services and final specification. A size shown here still needs a site and layout review. For other dimensions, ask about a bespoke design.
Options & example pricesSee the individual adjustments, then preview them on your room.
Each preview starts with this page’s smallest featured room and adds the chosen option. If a layout needs more space, its larger footprint and complete example total are shown below. These amounts use the same calculations as the customiser; they are not approved upgrade quotes.
Heating, internet or plumbing?
Tell us about heating and cooling, data connections, water and drainage, specialist sound isolation or equipment. These need a tailored specification and quotation; they are not priced in the options above.
Discuss your specificationExplore the possibilities.
Always close
A dedicated place to train, just a few steps from home.
Built for training
Flooring, ceiling height and layout considered around your equipment.
Your own routine
Strength, cardio, mobility or a combination that works for you.
More room for your everyday
A Smarter Way to Train at Home
Training at home often starts with good intentions. A few weights in the garage. A treadmill in the spare room. Over time, the problems appear — cold floors, poor ventilation, noise in the house, limited space, and equipment that never quite fits properly.
A dedicated garden gym changes that completely.
More about life with a garden gym
It gives you a separate, purpose-built environment where you can train properly, without disturbing the household or being distracted by it. You step out of the house, enter a focused space, and train on your own terms. For many clients, this separation is the key to consistency.
A garden gym is also a practical alternative to:
- Long-term gym memberships
- Travelling to and from training facilities
- Converting garages that are cold and restrictive
- Sacrificing valuable internal living space
Comfort without compromiseExplore the details
Made for movement. All year round.
A garden gym must work in January as well as July.
Our garden gyms are designed to remain:
- Warm in winter
- Cool and ventilated in summer
- Comfortable for long training sessions
This is achieved through proper insulation to walls, floor, and roof, controlled ventilation, and materials chosen for durability and performance. Flooring, wall finishes, and glazing are all specified with real training use in mind.
Acoustic separation is also critical. Being physically separate from the house reduces noise transfer immediately, allowing you to train freely without worrying about disturbing others.
Designed from the ground up
Built around your training.
No two people train the same way, so no two garden gyms should be identical.
Open the design studioMade for the way you liveA space that’s
A space that’s
truly yours.
Our garden gyms are used in many different ways, including:
What they all share is comfort, usability, and longevity.
01
Strength and free-weight training spaces
02
Cardio and conditioning rooms
03
Functional fitness studios
04
Yoga and mobility rooms
05
Hybrid gym-wellness spaces designed to evolve over time
Real gardens. Real spaces.
Explore all projectsSee what’s possible.
From first idea to finished space
One team. Every step.
We deliver garden gyms through a clear, end-to-end process so you’re not managing trades or decisions alone.
Consultation & Site Assessment
We discuss your training goals and assess what’s possible within your garden.
Bespoke Design
Your garden gym is designed specifically for your training style, equipment, and long-term use.
Build &
Installation
We manage the entire build, including groundworks, structure, insulation, doors, windows, flooring, and finishes.
Finished
Handover
You receive a complete, ready-to-use garden gym — not a shell, not a project, and not something you need to finish yourself.
The thinking behind your space
All the details.
Every room is bespoke. Explore what we consider when designing yours.
Fully Bespoke Design — Built Around How You Train
No two people train the same way, so no two garden gyms should be identical.
Every design begins with how you’ll actually use the space:
- Type of training and equipment
- Ceiling height and movement clearance
- Floor loading and impact absorption
- Mirror placement and lighting
- Storage and layout flow
- Future flexibility for other uses
We also design around the garden itself — orientation, access, boundaries, and how the building will sit visually within the space. The goal is always the same: a garden gym that feels considered, permanent, and motivating to use.
Who Our Garden Gyms Are Designed For
We design garden gyms for homeowners who are serious about how they use their space.
Fitness-Focused Homeowners
- Strength training, free weights, and racks
- Cardio equipment with proper floor loading
- Functional fitness and mobility training
- People training several times per week, year-round
Personal Training & Private Coaching (Residential Use)
- Homeowners working with personal trainers privately
- Space for safe movement, mirrors, and equipment flow
- Privacy without public gym distractions
Wellness-Led Buyers
- Yoga, Pilates, stretching, and mobility practice
- Calm, light-filled spaces that support recovery
- Integration with sauna or wellness use over time
Households Wanting Balance
- People who want to train without impacting family life
- Early-morning or late-evening workouts without noise concerns
- A dedicated zone that supports long-term health habits
We build residential garden gyms only. We don’t design commercial fitness facilities, and we don’t compete on lowest price — because performance, comfort, and durability matter more than cutting corners.
Built to Avoid Common Problems
Many homeowners approach us after seeing or experiencing garden gyms that fall short in real use. Our approach is designed to avoid issues such as:
- Condensation and damp
- Cold floors and poor insulation
- Overheating during training
- Insufficient ceiling height
- Weak flooring for heavy equipment
- Flimsy structures that feel temporary
- Buildings that quickly become storage
A garden gym should support your health and routine — not become another unused space.
The Cedar approachConsidered from
Considered from
the ground up.
Your written quotation sets out exactly what is included. Cedar’s published specification provides the starting point.
- Design consultation and a bespoke plan
- Insulation for year-round use
- Electrics, lighting, plastered walls and flooring
- Glazing and a choice of exterior finishes
- Site-specific foundations: concrete or ground screws
- Build coordination and aftercare
Cedar publishes a 10-year structural warranty and a 20-year EPDM roof guarantee. Ask for the applicable terms with your quote.
Materials & construction details
- Insulation
- Year-round use is part of the brief. Your specification confirms the wall, floor and roof build-up, insulation thicknesses and thermal performance.
- Cladding & interior
- Choose the exterior finish, then agree flooring, wall finishes and any fitted joinery. Ask to see the proposed material samples and care guidance.
- Roof & drainage
- Confirm the EPDM roof specification, roof edges, any canopy, and gutter and downpipe positions on the final drawings.
- Doors & windows
- The customiser explores door styles and side glazing. Exact opening sizes, frame material, glazing performance and locks are agreed for your build.
- Electrics & lighting
- Agree socket quantities, lighting, heating loads and data needs. The quotation must identify the connection to the house, cable route and any trenching or extra work.
- Foundations
- Concrete foundations or ground screws are considered at the site visit. Ground conditions, levels and the intended load determine the final approach.
Exact technical values belong to your agreed specification. The visualiser does not establish insulation ratings, certified internal clearances or construction dimensions.
What do we confirm for your project?
Access and groundwork; exact foundations; electrical and internet connections; heating and ventilation; any water and drainage; interior fit-out; specialist equipment; tax treatment; the programme and warranty terms. Items are included only where stated in your written quotation.
Before the buildA little planning.
A little planning.
A better fit.
A few details about your garden help turn a starting design into a properly considered quotation.
01 · Space
Measure beyond the footprint.
The sizes shown are external room dimensions. Interior space is smaller once the walls and finishes are allowed for. Roof edges, gutters, decking and a canopy may extend beyond that footprint.
Share your available width and depth, boundaries, trees and any height restrictions. We’ll confirm internal dimensions and working space around the room in the drawings.
02 · Access & ground
Show us the route in.
Photographs of the garden and the access route are useful, including narrow gates, steps, changes in level and an existing base.
Discuss clearance and foundations with us before arranging groundworks. An existing concrete base needs review before it can be included in the design.
03 · Services
Plan the connections.
List the equipment you intend to use, where sockets and lights will help, and whether you need heating, cooling or wired internet.
Water, drainage and the electrical connection back to the house need a site-specific scope. Ask for these works, the programme and VAT breakdown to be clear in your quote.
From Cedar Spaces customers
Read all customer reviewsSpaces people love.
We are really pleased with our garden room. Mix of gym and snug room. Brian worked with us to maximise the use of the plot and was also flexible with design as we worked through cabling and door choices later in the process. Good quality workmanship a done to time 👍🏼Google review
Highly Recommend! Brian and his team were informative, honest and prompt to handle any queries or updates. Whole thing was finished end to end in a couple of weeks and months on I couldn't be happier!Google review
Couldn’t be happier with how our cabin turned out; highly recommend.Google review
Before you begin
A little clarity.
Have a question about your own garden?
Talk it through with our team.
How much space does my gym equipment need?
Provide the equipment dimensions, movement and ceiling-height requirements. A floor footprint alone is not enough to confirm safe use; the final layout must allow for exercise and circulation.
Can I add a recovery area or ice bath?
The customiser includes a recovery zone and an outdoor ice-bath option. Equipment supply, loading and installation requirements are confirmed separately.
What does the starting price cover?
It is a base building guide calculated from Cedar’s published £1,250/m² starting rate, rounded up to the nearest £100. It is not a fixed installed price. Cedar Spaces is VAT registered. Your written quotation will show the VAT breakdown, foundations, services, installation, upgrades and specialist fit-out.
Can I use my garden room throughout the year?
Cedar’s rooms are insulated for year-round use. Heating, ventilation, glazing and the way you use the space are considered together in the final specification.
What about planning permission and building regulations?
The requirements depend on your property, location, dimensions and intended use. Check your project with the local authority before work begins. A customiser design does not establish permission or regulatory compliance.
How long does a build take?
Cedar’s published build guide is around one to three weeks for a straightforward room. Site preparation, specialist services and the agreed design can change the programme; confirm your start date and build schedule with the team.
Are the sizes internal or external?
The price examples and customiser show external room dimensions. Wall build-up reduces the usable interior, while roof edges, gutters, a canopy or decking may need additional space outside. Confirm exact internal dimensions, overall projections and access clearances in your agreed drawings.
Does the electrical package include the connection to my house?
Cedar’s room specification includes electrics and lighting, but the route, capacity, trenching and connection to your house depend on the site. Ask for the connection work, socket quantities and any additional electrical costs to be explicitly included in the written quote.
Should I prepare a base before ordering?
Speak to the team before arranging a base or groundworks. Cedar uses concrete foundations or ground screws depending on the project. An existing base, the garden levels, access and intended loads need to be reviewed at the site visit.
Made locally. Made for you.Explore our local garden room guides
Close to home.
Cedar Spaces is based in Harpenden (AL5) and designs and builds garden gyms across Hertfordshire and North London, including:
Hertfordshire
St Albans
Jersey Farm
Fleetville
Marshalswick
Sopwell
Bernards Heath
London Colney
Park Street
Chiswell Green
Bricket Wood
Colney Heath
Sandridge
St Michael’s
Harpenden
Batford
Southdown
Kinsbourne Green
Wheathampstead
Redbourn
Markyate
Kimpton
Codicote
Ayot Green
Ayot St Lawrence
Flamstead
Studham
Hexton
Welwyn Garden City
Welwyn
Digswell
Tewin
Tewin Wood
Oaklands
Mardley Heath
Hatfield
Old Hatfield
Brookmans Park
Essendon
Little Berkhamsted
Hertford
Bengeo
Hertingfordbury
Ware
Stanstead Abbotts
Hunsdon
Much Hadham
Widford
Hitchin
Ickleford
Pirton
Holwell
St Ippolyts
Great Wymondley
Little Wymondley
Letchworth Garden City
Baldock
Graveley
Stevenage
Kings Langley
Knebworth
Hemel Hempstead
Boxmoor
Apsley
Leverstock Green
Bovingdon
Chipperfield
Abbots Langley
Watford
Croxley Green
Rickmansworth
Chorleywood
Sarratt
Bushey
Radlett
Shenley
Borehamwood
Elstree
Aldenham
Letchmore Heath
Potters Bar
Cuffley
Goffs Oak
Cheshunt
Berkhamsted
Northchurch
Tring
Wigginton
Aldbury
North London
Barnet
High Barnet
Arkley
Hadley Wood
New Barnet
East Barnet
Friern Barnet
Whetstone
Totteridge
Mill Hill
Finchley Central
North Finchley
West Finchley
East Finchley
Church End
Woodside Park
Hampstead
Hampstead Garden Suburb
Highgate
Dartmouth Park
Muswell Hill
Alexandra Palace
Enfield Town
Southgate
Winchmore Hill
Palmers Green
Cockfosters
Oakwood
Grange Park
Bush Hill Park
Enfield Chase
Crouch End
Hornsey
Tell us where you’re based when you discuss your project.
Let’s make it yoursLet’s plan your
Let’s plan your
garden gym.
Share a first idea or a detailed plan. We’ll talk through your space, what matters to you and how to bring it together.
A little about your project.
A few details are all we need to start the conversation.
