4 × 3 m
12 m² external footprint
From £15,000Base building guide- Natural cedar
- Sliding doors
- Main space with a separate area
- Decking, canopy & extra glazing optional
Bespoke by Cedar Spaces
Sauna & Wellness
A little distance. A deeper calm.
Base guide from £15,0004 × 3 m starting footprint · VAT-registered business · specification by quotationPhotograph 1 of 2: Sauna & Wellness by Cedar Spaces
Meet your wellness room.
Step out of the everyday. A private place for warmth, recovery and quiet, designed around your own wellbeing routine.
Discover what makes it a Cedar Space
Bespoke Sauna & Wellness Rooms in Hertfordshire & North London
A sauna or wellness room should feel calm, private, and intentional — a space that supports recovery, relaxation, and wellbeing without compromise. Not a damp outbuilding. Not a converted shed that struggles with heat and moisture. And not a room that feels uncomfortable or makes you hesitant to use it regularly.
At Cedar Spaces Garden Rooms, we design and build bespoke sauna and wellness rooms from our base in Harpenden, serving homeowners across Hertfordshire and North London. These spaces are created for people who want a dedicated environment for wellness — somewhere to step away from the house, slow down, and invest in long-term health and balance.
Every sauna and wellness room we build is designed from scratch, constructed for year-round comfort and durability, and delivered as a complete, finished space — not a kit, not a shell, and not a short-term solution.
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 × 3.5 m
17.5 m² external footprint
From £21,900Base building guide- Natural cedar
- Sliding doors
- Main space with a separate area
- Decking, canopy & extra glazing optional
6 × 4 m
24 m² external footprint
From £30,000Base building guide- Natural cedar
- Sliding doors
- Main space with a separate area
- 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 sauna & wellness 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.
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.
Time for yourself
A calm, private space away from the pace of the house.
Purposefully built
Materials and ventilation planned for heat and moisture.
Your wellbeing routine
Sauna, relaxation, gentle movement or a space that combines them.
More room for your everyday
A Dedicated Space for Recovery, Calm, and Routine
Wellness spaces work best when they’re separate from everyday life.
Trying to integrate recovery, mindfulness, or sauna use into the main house often leads to compromise — lack of privacy, limited space, moisture concerns, or a room that never quite feels restful. Over time, the habit fades.
More about life with a wellness room
A dedicated sauna or wellness room in the garden changes that dynamic.
It creates a clear boundary between daily routines and personal wellbeing. You step out of the house, enter a calm, purpose-built environment, and focus on recovery or relaxation without distraction. For many clients, this separation is what makes wellness a consistent, sustainable part of life.
A sauna or wellness room is often a more practical alternative to:
- Ongoing spa or gym memberships
- Sharing limited bathroom or internal space
- Adapting rooms not designed for heat or moisture
- Building an internal extension purely for wellness use
Comfort without compromiseExplore the details
Comfort. In every detail.
Sauna and wellness rooms place different demands on a building.
Our rooms are designed to remain:
- Comfortable and stable in all seasons
- Suitable for heat and humidity
- Pleasant before, during, and after use
This is achieved through proper insulation, moisture-aware construction, ventilation planning, and materials chosen for durability. The aim is a space that feels calm and controlled — not one that struggles with condensation, temperature swings, or long-term wear.
Being physically separate from the house also helps contain heat and moisture, while maintaining a sense of retreat and privacy.
Designed from the ground up
Your own place to reset.
Wellness is personal, so the space should be too.
Open the design studioMade for the way you liveA space that’s
A space that’s
truly yours.
Our sauna and wellness rooms are used in many ways, including:
What they all share is comfort, privacy, and a sense of calm that encourages regular use.
01
Dedicated home sauna spaces
02
Combined sauna and relaxation rooms
03
Recovery rooms alongside garden gyms
04
Meditation and mindfulness retreats
05
Calm, low-stimulation personal spaces
Real gardens. Real spaces.
Explore all projectsSee what’s possible.
From first idea to finished space
One team. Every step.
We deliver sauna and wellness rooms through a clear, end-to-end process so you’re not coordinating trades or managing complexity alone.
Consultation & Site Assessment
We discuss how you want to use the space and assess what’s possible within your garden.
Bespoke Design
Your wellness room is designed specifically for your routines, comfort, and long-term use.
Build &
Installation
We manage the full build, including groundworks, structure, insulation, doors, windows, and finishes.
Finished
Handover
You receive a complete, ready-to-use wellness space — 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’ll Use the Space
Wellness is personal, so the space should be too.
Every Cedar Spaces sauna and wellness room starts with how you intend to use it:
- Sauna-only use or combined wellness space
- Pre- and post-sauna relaxation areas
- Seating, lighting, and atmosphere
- Privacy from neighbouring properties
- Future flexibility for other uses
We also design around the garden — orientation, access, boundaries, and how the building sits visually within the outdoor space. The goal is a wellness room that feels intentional, calm, and integrated into its surroundings.
Who Our Sauna & Wellness Rooms Are Designed For
We work with homeowners who value quality, privacy, and long-term usability.
Wellness-Focused Homeowners
- People incorporating sauna use into regular routines
- Homeowners focused on recovery, relaxation, and stress reduction
- Clients creating a calm retreat away from the main house
Fitness & Performance-Led Buyers
- Home gym users adding recovery space
- Athletes and active homeowners prioritising mobility and recovery
- People combining sauna use with stretching or breathwork
Mindfulness & Calm Spaces
- Meditation and quiet reflection rooms
- Yoga, Pilates, or gentle movement spaces
- Low-stimulation environments designed for calm
Homeowners Who Care About Design & Longevity
- People investing in wellness as part of their lifestyle
- Buyers who want a space that enhances the garden visually
- Homeowners avoiding makeshift or poorly performing structures
Our work is residential and bespoke. We don’t build commercial spa facilities, and we don’t compete on lowest price — because wellness spaces require careful design and reliable performance to be genuinely enjoyable.
Built to Avoid Common Problems
Many homeowners are drawn to the idea of a home sauna or wellness room but worry about long-term issues. Our approach is designed to avoid problems such as:
- Condensation and moisture damage
- Overheating or poor temperature control
- Rooms that feel uncomfortable outside of use
- Materials that degrade over time
- Poorly ventilated spaces
- Structures that feel temporary or out of place
A wellness room should support recovery and relaxation — not create stress or maintenance concerns.
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.
Is the sauna package included in the starting guide?
The base guide covers the building budget only. The customiser shows a separate illustrative sauna-package amount. Equipment, ventilation and installation must be confirmed in the final quotation.
Can I combine sauna and recovery space?
Yes. The starting concept includes a separate recovery zone. We will review heat, moisture, ventilation and the chosen equipment before agreeing the final design.
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 sauna and wellness rooms 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
wellness room.
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.
