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Garden room for year-round use, conservatory for spring–autumn — what each costs and which suits you.
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Hiring a conservatories, without the regret.
Four moves that separate a smooth job from a nightmare.
Conservatory chosen for year-round use
Without tiled roof and proper insulation, summer/winter unusable. Garden rooms outperform conservatories on thermal comfort by default.
Garden room chosen for indoor-outdoor flow
Garden rooms are detached so you have to walk outside to get to them. Conservatories integrate seamlessly with the kitchen-diner.
Underestimating garden room cost
Headline "£8,500 garden room" rarely includes foundations, electrical or planning. Add 30–50%.
Planning surprises
Garden rooms in conservation areas often need permission where conservatories wouldn't.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and a typical week-by-week schedule.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Small conservatory (3m × 3m uPVC)Lean-to or basic
£8.5k–£15k
Medium conservatory (3.5m × 4m)Edwardian/Victorian
£11k–£26k
Small garden room (3m × 3m)SIPS or timber-frame
£10k–£20k
Medium garden room (4m × 5m)Insulated, year-round use
£18k–£32k
Premium garden room (5m × 6m+)Bathroom, kitchen, bedroom
£30k–£55k
Garden room foundationsConcrete pad or screw piles
£800–£3.5k
!
Quote spread is typically ± 18% — always get 3 quotes.
Timeline
Mid-size conservatory · week by week
Typical
5 phases · 5 wk
5 phases · 5 wk
W1
W2
W3
W4
W5
Foundations + dwarf wall
Frame + glazing
Roof + ridge
Electrics + flooring
Snags + handover
!
Schedule slips on dependencies — pad each phase by 10–20% for real-world delays.
At a glance
Infographic · VideoThe Conservatories briefing.
Infographic
Conservatories quick-view
Video guide
Conservatories explained
Garden rooms and conservatories overlap in purpose — both extend the home into the garden — but differ fundamentally in construction, regulation and lifestyle use. Expect to pay £8,500–£55,000 for a conservatory and £10,000–£40,000 for a garden room. This guide compares them head-to-head.
What Does the Work Involve?
A conservatory is attached to the house, with brick dwarf wall, glazed walls, glass or tiled roof, and shared heating/electric with the main dwelling. A garden room is freestanding (set back from any boundary), typically timber-framed with cladding, insulated walls, EPDM/felt flat roof, fully insulated and weatherproof — essentially a small detached building. Garden rooms can include kitchen, shower room, and bedroom uses.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Small conservatory (3m × 3m uPVC) | 8,500 | 15,000 | Lean-to or basic |
| Medium conservatory (3.5m × 4m) | 11,000 | 26,000 | Edwardian/Victorian |
| Small garden room (3m × 3m) | 10,000 | 20,000 | SIPS or timber-frame |
| Medium garden room (4m × 5m) | 18,000 | 32,000 | Insulated, year-round use |
| Premium garden room (5m × 6m+) | 30,000 | 55,000 | Bathroom, kitchen, bedroom |
| Garden room foundations | 800 | 3,500 | Concrete pad or screw piles |
| Garden room electrical (with consumer unit) | 1,500 | 4,500 | SWA cable from house |
How Long Does It Take?
Conservatory: 4–6 weeks. Garden room: 3–6 weeks (often factory-fabricated and craned in). Garden rooms have shorter on-site time but longer lead times for bespoke designs.
DIY or Professional?
Conservatory: professional only. Garden room: professional for the structure; smaller DIY garden buildings (under 15 m²) can be built by competent DIYers but won't give the same insulation and finish.
Choosing the Right Tradesperson
Conservatory installer for the former; garden-room specialist (Cabin Master, Green Retreats, GardenRoom365) for the latter. Don't ask a conservatory installer to build a garden room — different skills and materials.
UK Regulations
Conservatory: Building Regs exempt under 30 m² + external doors, permitted development under 4m height. Garden room: typically exempt from Building Regs if used as an outbuilding (no sleeping accommodation), and permitted development under 2.5m height (or 4m apex if pitched) and within prescribed area limits. Garden room as ancillary accommodation (sleeping) needs Building Regs.
Common Problems With Decision
- Conservatory chosen for year-round use: Without tiled roof and proper insulation, summer/winter unusable. Garden rooms outperform conservatories on thermal comfort by default.
- Garden room chosen for indoor-outdoor flow: Garden rooms are detached so you have to walk outside to get to them. Conservatories integrate seamlessly with the kitchen-diner.
- Underestimating garden room cost: Headline "£8,500 garden room" rarely includes foundations, electrical or planning. Add 30–50%.
- Planning surprises: Garden rooms in conservation areas often need permission where conservatories wouldn't.
Frequently Asked Questions
Which is more usable year-round — conservatory or garden room?
Garden room — always insulated to a habitable spec. Conservatories need tiled roof and proper glazing to match.
Which adds more property value?
Conservatories: 5–10% value-add for quality builds. Garden rooms: 5–8% — slightly less because they're detached, but more if used as a home office/studio that's quoted in the EPC.
Can I have a garden room with a kitchen?
Yes — many garden rooms have small kitchenettes. Adding a kitchen with water and drainage changes the Building Regs picture (Part G water, Part H drainage).
Can I sleep in a garden room?
Only if it's been built to Building Regs as ancillary accommodation. Otherwise it's used as an outbuilding only.
Which is faster to build?
Garden room — many are factory-built and craned into place in 1–2 days. On-site finishing takes 1–2 weeks total.
Which needs more maintenance?
Conservatory — annual roof clean, every-10-years seal replacement, every-20-years frame refresh. Garden room is closer to a "house" maintenance cycle (paint every 7–10 years on timber cladding).
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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Keep reading
VIEW ALL CONSERVATORIES GUIDES →More conservatories guides.
Guide
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