How Much Does a Conservatory Cost? 2026 Price Guide
Full pricing breakdown by size (small, medium, large), material, and cost per square metre. Includes uPVC, aluminium, timber, glass box extensions – with groundwork, planning & labour.
Get Fixed Price Quote →📊 2026 Conservatory Cost Snapshot
Small conservatory (3x3m / 9-12m²): £18,000 – £35,000 · Medium (4x4m / 16-20m²): £25,000 – £55,000 · Large (5x5m+ / 25-35m²): £37,000 – £100,000+
Average cost per m²: uPVC £1,400-1,800 | Aluminium £2,100-2,500 | Hardwood £2,600-3,200 | Glass box £3,000+
⬇️ Below: detailed tables by size, per m² rates, hidden fees, and orangery comparison.
🏡 How much does a small conservatory cost?
A small conservatory (typically 3m x 3m up to 3.5m x 3.5m, approx 9–12m²) is perfect for a compact garden room, breakfast nook, or home office. Even for small footprints, groundworks, glazing, and installation form the majority of the budget. Below are realistic fully installed 2026 prices including foundations, base, uPVC/aluminium/timber frames, glass roof, electrics prep, plastering, and finishing.
| Material | Small (3m x 3m) – price range | Typical all-in cost (mid-range) |
|---|---|---|
| uPVC (lean-to / Victorian small) | £18,000 – £24,000 | £21,000 |
| Aluminium (slim-frame modern) | £26,000 – £33,000 | £29,500 |
| Hardwood / Timber | £31,000 – £40,000 | £35,000 |
| Glass box extension (minimalist) | £38,000 – £52,000 | £45,000 |
Key cost factors for small conservatories: site access, foundation type (strip vs screw piles), and glass specification (self-cleaning or solar control adds £1,500-£3k). Always compare itemised quotes.
📐 Conservatory cost by size: Small vs Medium vs Large (2026)
Size is the single biggest driver of cost. The table below shows installed prices across four premium materials for three standard size categories. All prices include groundwork, installation, glass roof, internal finish, and VAT.
| Material | Small (3x3m / 9-12m²) | Medium (4x4m / 16-20m²) | Large (5x5m / 25-30m²) |
|---|---|---|---|
| uPVC | £18,000 – £24,000 | £25,000 – £35,000 | £37,000 – £48,000 |
| Aluminium | £26,000 – £33,000 | £37,000 – £49,000 | £52,000 – £70,000 |
| Hardwood (timber) | £31,000 – £40,000 | £44,000 – £58,000 | £65,000 – £85,000 |
| Glass box (structural glazing) | £38,000 – £52,000 | £55,000 – £80,000 | £85,000 – £125,000+ |
Note: Large glass box extensions often require steel reinforcement and deeper foundations, reflected in higher ranges. For a tailored quotation, request a site survey.
📏 Conservatory cost per square metre – 2026 pricing benchmark
Understanding cost per m² helps you compare different quotes and estimate your project regardless of shape. These rates include full construction: substructure, frame, insulated glass roof, glazing, electrics, plastering, and decoration (mid-spec).
| Material | Cost per m² (low – high) | Typical total (20m² example) |
|---|---|---|
| uPVC | £1,400 – £1,800 / m² | £28,000 – £36,000 |
| Aluminium | £2,100 – £2,500 / m² | £42,000 – £50,000 |
| Hardwood / Timber | £2,600 – £3,200 / m² | £52,000 – £64,000 |
| Glass box / structural glass | £3,200 – £4,500 / m² | £64,000 – £90,000 |
How to use: multiply your desired square metres by the rate above, then add site-specific extras (e.g., difficult access, upgrading underfloor heating). A 16m² aluminium conservatory would estimate £33,600 – £40,000. Contact us for a precise computer-aided quote.
💰 Essential cost factors & hidden fees to budget
Beyond the frame and glass, several elements influence your final investment. A transparent quote should always include:
- Groundworks & foundations: £3,000 – £10,000 (sloping sites or poor soil add cost).
- Planning & building regs: Permitted development is free; planning fees £206-462. Building regulations (open-plan or >30m²) £400-£800.
- Labour & installation: Typically 25-35% of total price – ensure certified installers.
- Heating & electrics: Underfloor heating + lighting circuits: £1,500-£4,000.
- Blinds / solar control: Essential for glass roofs: £800 – £2,500.
Pro tip: Room Outside’s fixed-price quotes cover everything from demolition to final clean – no ‘surprise’ extras.
⚖️ Cost comparison: Conservatory vs Orangery vs Glass extension
| Type | Typical cost (20m²) | Best for |
|---|---|---|
| uPVC Conservatory | £25,000 – £40,000 | Budget-friendly garden room, traditional style |
| Aluminium Orangery | £45,000 – £70,000 | Brick pillars, lantern roof, premium kitchen extension – compare orangery cost guide |
| Glass Box Extension | £60,000 – £120,000 | Contemporary architectural statement, seamless indoor-outdoor – see glass box range |
| Traditional brick extension | £50,000 – £90,000 | Permanent living space, longer build time |
Looking for orangery-specific pricing? Read our comprehensive glass extension & orangery cost guide for 2026 updates.
Need accurate costing for your home?
Our design consultants provide detailed, fixed-price quotes after a site survey – no hidden line items.
Request a detailed quote →📞 Or call David on 01243 538999 – quick consultation.
📋 Planning & Building Regulations – what you’ll pay
Planning permission: Most conservatories are permitted development (no fee). However, listed buildings, conservation areas, or oversized projects: application fee £206 (householder) to £462. Read full planning guide.
Building regulations: If your conservatory is open-plan to the house (no external-quality door) or exceeds 30m², you’ll need Building Control approval (£300-£800). Our turnkey service manages both.
📌 Frequently asked questions on cost
How much does a small conservatory cost in 2026?
A small bespoke conservatory (roughly 3x3m) costs £18,000–£35,000 fully installed. uPVC from £18k, aluminium from £26k, hardwood £31k+. Prices include groundwork, electrics, and plaster.
What’s the average conservatory cost per square metre?
Expect £1,400-£1,800/m² for uPVC, £2,100-£2,500/m² for aluminium, and £2,600-£3,200/m² for hardwood. Glass box starts at £3,200/m².
Are uPVC conservatories cheaper than aluminium?
Yes, uPVC is 30-50% less expensive upfront. Aluminium offers longer lifespan, slimmer frames, and modern aesthetics – a 4x4m aluminium costs ~£37k-49k vs uPVC £25k-35k.
Do I need to pay planning fees for a conservatory?
Most fall under Permitted Development (no fee). But for protected properties: planning fees £206–462. Building regulations extra if open-plan.
What hidden costs do budget quotes exclude?
Groundworks, removal of existing structures, upgraded glass, underfloor heating, and internal finishes. Always ask for a fully inclusive fixed-price contract.
Glass box vs conservatory – which costs more?
Glass box extensions cost 60-100% more than a standard uPVC conservatory due to structural glass engineering. For 20m², glass box starts at £60k, while uPVC ~£28k–£40k.
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