Conservatory Costs in the UK: Prices, Alternatives, and Whether It's Still Worth It

Conservatories were the UK's go-to home extension for decades. At their peak in the early 2000s, over 200,000 were installed each year. But the market has shifted dramatically — today, homeowners are increasingly choosing proper extensions, orangeries, or solid-roof upgrades over traditional glazed conservatories. Here's why, and whether a conservatory still makes sense for your home.

Conservatory Types and Costs

By Style

| Style | Size | uPVC Cost | Aluminium Cost | |---|---|---|---| | Lean-to | 10–15m² | £5,000–£10,000 | £8,000–£15,000 | | Victorian (faceted front) | 12–18m² | £8,000–£15,000 | £12,000–£22,000 | | Edwardian (rectangular) | 12–20m² | £8,000–£16,000 | £12,000–£24,000 | | Gable-end | 14–20m² | £10,000–£18,000 | £15,000–£25,000 | | P-shaped (combined) | 20–30m² | £15,000–£25,000 | £20,000–£35,000 |

By Roof Type

| Roof | Cost (typical 15m² conservatory) | Thermal Performance | Lifespan | |---|---|---|---| | Polycarbonate | £6,000–£12,000 | Poor (hot summer, cold winter) | 10–15 years | | Glass | £8,000–£16,000 | Fair (better than poly, still extreme) | 20–30 years | | Solid (insulated) | £12,000–£22,000 | Good (usable year-round) | 30+ years |

Additional Costs

| Item | Cost | |---|---| | Base and dwarf walls | Usually included in quote | | Heating (radiator extension or electric) | £300–£1,500 | | Flooring (tiles, LVT, or engineered wood) | £500–£2,000 | | Blinds (roof and side) | £500–£2,000 | | Electrics (sockets, lighting) | £300–£800 | | Building Regulations (if solid roof) | £500–£1,000 |

The Problem With Traditional Conservatories

Temperature Extremes

A glazed-roof conservatory is essentially a greenhouse:

• Summer: Temperatures regularly exceed 35°C, making it unusable for 3–4 months
• Winter: Temperatures drop rapidly when heating is off — expensive to keep warm
• Result: Many conservatories are used as storage rooms for most of the year

Limited Value

Estate agents consistently report that traditional conservatories add little to property value:

• Glazed-roof conservatory: 0–5% value (sometimes negative)
• Solid-roof conservatory: 3–5% value
• Orangery: 5–8% value
• Proper extension: 5–15% value

For more on which improvements deliver the best return, see our ROI guide.

Maintenance and Lifespan

Conservatories need ongoing maintenance:

• Polycarbonate roof panels: Discolour and crack (replace every 10–15 years: £1,500–£3,000)
• Seals and gaskets: Perish and leak (reseal every 5–8 years: £200–£500)
• Gutters and frames: Clean annually, check for algae growth
• Glass cleaning: Roof glass is difficult to access safely

After 15–20 years, most conservatories need significant refurbishment (£3,000–£8,000) or full replacement.

The Modern Alternatives

1. Solid-Roof Conservatory Upgrade

If you already have a conservatory, replacing the glazed roof with an insulated solid roof is the most cost-effective upgrade.

• Cost: £4,000–£8,000
• Impact: Transforms an unusable space into a comfortable year-round room
• Thermal performance: U-value drops from 2.0+ (polycarbonate) to 0.15–0.18 (insulated roof)
• Building Regulations: Required — the solid roof changes the building's thermal performance and structural loading
• Planning: Usually permitted development as the footprint doesn't change

Verdict: Excellent value if your existing conservatory base and frame are sound.

2. Orangery

An orangery combines solid walls and roof with large glazed sections and a central roof lantern. It's architecturally more substantial than a conservatory and performs closer to a proper extension.

• Cost: £20,000–£40,000
• Thermal performance: Good — insulated walls and roof with glazed lantern for light
• Planning: Usually PD (same rules as extensions)
• Building Regulations: Yes — treated as a standard extension
• Value added: 5–8% of property value

Verdict: The middle ground between conservatory and extension. Good for homes where a full extension isn't practical or the budget doesn't stretch.

3. Proper Extension

A standard single-storey kitchen extension or rear extension with a flat or pitched roof and large rear glazing (bifolds or sliding doors) delivers everything a conservatory promises — light, garden connection, open-plan living — without the temperature extremes and maintenance issues.

• Cost: £30,000–£60,000 (20m²)
• Thermal performance: Excellent — fully insulated walls, roof, and floor
• Planning: Usually PD for standard sizes
• Building Regulations: Yes
• Value added: 5–15% of property value

Verdict: The best long-term investment. Higher upfront cost but superior comfort, durability, and value.

4. Garden Room

A detached insulated garden building as a separate living/working space.

• Cost: £10,000–£30,000
• Pros: No impact on the main house, often no planning permission needed, quick installation
• Cons: Separate from the house (crossing the garden in winter), usually no plumbing

Verdict: Best for home offices and studios where separation from the house is an advantage.

Comparison Table

| Feature | Conservatory (glazed) | Solid-Roof Conservatory | Orangery | Extension | |---|---|---|---|---| | Cost (15–20m²) | £8,000–£18,000 | £12,000–£22,000 | £20,000–£40,000 | £30,000–£60,000 | | Year-round comfort | Poor | Good | Good | Excellent | | Value added | 0–5% | 3–5% | 5–8% | 5–15% | | Lifespan | 15–20 years | 25–30 years | 30+ years | 50+ years | | Building Regs | Usually exempt | Required | Required | Required | | Maintenance | High | Low | Low | Very low |

When a Conservatory Still Makes Sense

Despite the shift away from conservatories, they can still be the right choice if:

• Budget is under £15,000 and you want covered garden-facing space
• You choose a solid roof — making it a year-round room
• You don't plan to sell soon — the enjoyment value outweighs the limited ROI
• You want a greenhouse-like space — for plants, a sun room, or seasonal dining
• Planning restrictions prevent a proper extension — some properties have conditions that only allow conservatories

Making the Decision

Ask yourself:

1. Will I use this space year-round? If yes, solid roof, orangery, or extension. If only in spring/summer, a glazed conservatory may suffice.
2. Am I selling within 5 years? If yes, an extension adds more value. If staying long-term, choose for lifestyle.
3. What's my budget? Under £15k = solid-roof conservatory. £15–30k = orangery. £30k+ = extension.
4. Do I want it to feel like "inside" or "outside"? A glazed conservatory blurs the line. An extension is unambiguously part of the house.

Next Steps

1. Define your budget and priorities — comfort, light, value, or all three?
2. Get comparative quotes — conservatory, orangery, and extension for the same space
3. Check our kitchen extension cost guide for detailed extension pricing
4. Use our free calculator for a personalised extension estimate
5. Read about which improvements add value before committing
6. Browse extension costs by city for regional pricing