5 × 3.5 m
17.5 m² external footprint
From £21,900Base building guide- Natural cedar
- Sliding doors
- Open interior layout
- Decking, canopy & extra glazing optional
Bespoke by Cedar Spaces
Multi-Purpose Rooms
One space. So many possibilities.
Base guide from £9,4003 × 2.5 m starting footprint · VAT-registered business · specification by quotationPhotograph 1 of 3: 9m x 5m Multipurpose Room in Harpenden
Meet your multi-purpose room.
Work, create, unwind and spend time together. A flexible garden room that feels right today and adapts as life changes.
Discover what makes it a Cedar Space
Bespoke Multi-Purpose Rooms in Hertfordshire & North London
A multi-purpose room should feel like a natural extension of how you live — calm, comfortable, and genuinely useful every day. Not a room built for one narrow purpose that quickly becomes redundant. Not a summer-only space that’s ignored half the year. And not a generic outbuilding that never quite earns its place.
At Cedar Spaces Garden Rooms, we design and build bespoke multi-purpose rooms from our base in Harpenden, serving homeowners across Hertfordshire and North London. These rooms are created for people who need flexibility without compromise — space that works today and adapts tomorrow, while still looking considered and permanent within the garden.
Every multi-purpose room we build is designed from scratch, constructed for year-round comfort, and delivered as a complete, finished space — not a kit, not a shell, and not a temporary 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.
6 × 4 m
24 m² external footprint
From £30,000Base 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 bespoke living 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.
More room for life
Space for work, family time, hobbies and the things you love.
Ready to adapt
Layouts, storage and services considered with the future in mind.
Comfort every day
A properly insulated room to use throughout the year.
More room for your everyday
Extra Space That Adapts as Life Changes
Many homeowners don’t lack space — they lack the right space.
A spare bedroom gets used occasionally. The dining table becomes an office by day. Hobbies spill into shared rooms. Over time, the house feels crowded, even though no single change feels big enough to justify moving or extending.
More about life with a multi-purpose room
A multi-purpose room solves this by creating a dedicated, flexible space outside the main house.
It gives you breathing room without locking you into one use. The same room might serve as:
- A quiet workspace during the week
- A creative or hobby room in the evenings
- A teen hangout as children grow
- A calm retreat when the house feels busy
Because it’s properly built and insulated, it remains comfortable and usable throughout the year — not just when the weather cooperates.
A multi-purpose room is often a smarter alternative to:
- Internal extensions that permanently alter the home
- Loft conversions that remove storage and add disruption
- Converting garages that are cold and impractical
- Moving house just to gain one additional room
Comfort without compromiseExplore the details
Make yourself at home.
Flexibility only works if the room is comfortable in every season.
Our multi-purpose rooms are designed to remain:
- Warm in winter
- Comfortable in summer
- Pleasant for long periods of use
This comes from proper insulation to walls, floor, and roof, thoughtful ventilation, and construction methods that prioritise performance and durability.
Acoustic comfort also matters. Being physically separate from the house immediately reduces noise, creating a calmer environment whether the room is used for work, study, hobbies, or relaxation.
Designed from the ground up
For today. And what comes next.
A flexible room needs to be designed with more foresight than a single-use space.
Open the design studioMade for the way you liveA space that’s
A space that’s
truly yours.
Our multi-purpose rooms are used in many different ways, including:
What they all share is comfort, usability, and the ability to evolve.
01
Combined workspace and relaxation rooms
02
Teen dens and study areas
03
Creative studios and hobby rooms
04
Cinema or games rooms with a calm, high-quality feel
05
Quiet rooms for reading and personal downtime
Real gardens. Real spaces.
Explore all projectsSee what’s possible.
From first idea to finished space
One team. Every step.
We deliver multi-purpose rooms through a clear, end-to-end process so you’re not managing trades or decisions alone.
Consultation & Site Assessment
We discuss how you want to use the room, what flexibility you need, and what’s possible within your garden.
Bespoke Design
Your room is designed specifically for your lifestyle and long-term plans, balancing comfort, appearance, and adaptability.
Build &
Installation
We manage the full build, including groundworks, structure, insulation, doors, windows, and finishes.
Finished
Handover
You receive a complete, ready-to-use room — 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 for Present and Future Use
A flexible room needs to be designed with more foresight than a single-use space.
Every Cedar Spaces multi-purpose room begins with how you’ll use it now — and how it might be used later. Design considerations include:
- Adaptable layouts and furniture zones
- Lighting and glazing that suit multiple activities
- Power and data planning for changing needs
- Privacy and sightlines to neighbouring properties
- Storage solutions that don’t dominate the room
We also design around the garden itself — orientation, access, boundaries, and how the building sits visually within the outdoor space. The aim is always the same: a room that feels intentional, not opportunistic.
Who Our Multi-Purpose Rooms Are Designed For
We work with homeowners who value flexibility, quality, and long-term usability.
Families Needing Adaptable Space
- Teenagers needing their own area
- Homework and study rooms
- Family rooms that reduce pressure on the main house
- Multi-generational households needing overflow space
Professionals Wanting Occasional Separation
- Part-time home workers who don’t need a full office
- Homeowners needing a quiet room for calls or admin
- Couples who need separation at certain times of the day
Lifestyle & Specialist Use
- Creative studios for art, music, photography, or content creation
- Hobby rooms where equipment can stay set up
- Calm rooms for reading, stretching, meditation, or downtime
Homeowners Who Care About Design & Longevity
- People investing in their property for the long term
- Buyers who want the building to enhance the garden visually
- Homeowners avoiding structures that will age poorly
Our work is residential and bespoke. We don’t build commercial spaces, and we don’t compete on lowest price — because flexible rooms still need high performance to remain genuinely usable.
Built to Avoid Common Problems
Many “flexible spaces” fail because they’re not designed for real, everyday use. Our approach is built to avoid issues such as:
- Rooms that are cold in winter and stifling in summer
- Condensation and damp over time
- Generic layouts that don’t adapt well
- Flimsy structures that feel temporary
- Buildings that cheapen the look of the garden
- Spaces that slowly become storage because they’re unpleasant to use
A multi-purpose room should make life easier — not add another problem to manage.
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.
Can I separate work and family space?
Yes. Explore a separate living zone or storage in the customiser, then discuss the exact furniture and internal clearances with our team.
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 multi-purpose 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
multi-purpose 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.
