How Much Does an Orangery Cost in 2026? (UK)
A typical 4x4m orangery costs £20,000–£45,000 fully fitted in 2026. A modest uPVC-and-brick orangery starts around £20,000; a mid-range aluminium build with a glazed roof lantern sits at £28,000–£38,000; and a large hardwood orangery with bi-folds and underfloor heating runs past £45,000. That places it above a conservatory but below a full masonry extension. Here is the full 2026 cost breakdown by size and spec, why the roof lantern is the single biggest line, and when a brick extension is the better spend.
2026 orangery cost breakdown
| Size & spec | Fitted price (2026) | Notes |
|---|---|---|
| 3x3m uPVC orangery, brick base | £20,000–£26,000 | Entry level, glazed lantern |
| 4x4m aluminium, roof lantern | £28,000–£38,000 | Most popular size |
| 4x5m hardwood, bi-folds, UFH | £40,000–£55,000 | Premium, extension-grade finish |
| Roof lantern (supply only, per unit) | £2,500–£6,000 | Biggest single cost line |
| Comparison: 4x4m brick extension | £50,000–£70,000 | Full masonry, tiled roof |
What's included in a fitted orangery price
- Foundations, brick piers and dwarf wall
- Glazed or solid-perimeter roof with a central lantern
- Windows, doors (French or bi-fold) and internal pelmet
- Electrics, lighting and (on mid/high spec) underfloor heating
- Building Regulations sign-off and a structural guarantee
Why the roof lantern drives the price
The defining orangery feature — a flat perimeter roof with a raised glazed lantern — is also the most expensive component per square metre. A larger or double lantern, low-iron glass, or a powder-coated aluminium frame can add £2,000–£5,000 on its own. It is the first place to look when comparing two quotes that differ by several thousand pounds.
When a full extension is the smarter spend
If you want a true year-round room with the same thermal performance as the rest of the house, a full brick extension at £50,000–£70,000 may be better value per usable square metre than a top-spec orangery creeping toward £55,000. The orangery wins on speed, lighter foundations, and that distinctive light-filled character; the extension wins on insulation, resale and integration.
How long an orangery takes to build
An orangery is a masonry build with a glazed roof, so it takes considerably longer than a conservatory and behaves much more like a small extension. Most of the elapsed time is before anyone arrives on site.
| Stage | Typical duration | Notes |
|---|---|---|
| Design and survey | 2–4 weeks | Lantern size and dwarf-wall height set the look and the cost |
| Planning, if needed | 8 weeks | Often permitted development — check before assuming |
| Foundations and dwarf walls | 2–3 weeks | Ground conditions are the main variable |
| Frames and glazing | 1–2 weeks | Usually made to order after the survey, so order early |
| Roof lantern | 3–5 days | Craned or hand-set depending on size and access |
| Internal finishing | 1–2 weeks | Plastering, flooring, electrics and heating |
Six to ten weeks on site is typical, with three to four months from first enquiry to finished room. The glazing lead time is the item most likely to move your date — get the survey done early.
How long an orangery lasts
The masonry outlives everything else comfortably. What dates an orangery is the glazing and the seals, so the specification you choose now decides what the room costs you in twenty years.
| Component | Expected life | What fails first |
|---|---|---|
| Brick dwarf walls and piers | 60 years+ | Nothing, if the damp course was done properly |
| Aluminium frames | 30–40 years | Powder coating dulls long before the frame goes |
| uPVC frames | 25–30 years | Discolouration and seal failure at the corners |
| Timber frames | 20–40 years | Entirely down to whether it is maintained |
| Sealed glazed units | 15–25 years | Misting between panes — the classic sign of failure |
| Roof lantern | 20–30 years | Seals and gaskets rather than the structure |
The single biggest determinant of comfort is the glass specification, not the frame. Self-cleaning solar-control glass in the lantern costs more up front and is the difference between a room you use in July and one you avoid.
Planning permission and building regulations for an orangery
Planning permission — usually not. An orangery is treated as an extension, so it normally falls under permitted development within the usual size, height and boundary limits. It is needed if the house is listed, you are in a conservation area, the property is a flat or maisonette, or permitted development rights have been removed.
Building regulations — usually YES, and this is where orangeries differ from conservatories. A conservatory is exempt from most building regulations when it is at ground level, under 30m², separated from the house by external-quality doors or walls, has its own heating controls, and its glazing meets Part K safety rules. An orangery with a substantial solid roof and open access to the house typically fails that definition — which means full building regulations apply, including Part L insulation.
This matters commercially as well as legally. Ask any installer, in writing, whether they are treating the build as an exempt conservatory or as a notifiable extension, and who is notifying building control. It changes the specification, the price and the paperwork you will need when you sell. See planning rules for extensions.
How to check an orangery installer before you commit
Get it in writing
An itemised quote covering groundworks, structure, glazing specification, doors, electrics and waste. If two quotes differ, it is almost always because they cover different work.
Check the insurance yourself
Ask for the public liability certificate and confirm with the insurer that it is current and in the same trading name as the quote. A logo on a van proves nothing.
Ask who signs it off
Establish before work starts whether building control is involved and who notifies it. Getting a certificate retrospectively is slow, costs more, and it will surface when you sell.
On payment: a deposit for materials is normal; after that pay in stages against completed work. Never pay in full up front.
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Orangery — guides and detail
The detail behind the number: what changes the price, the planning position, and how to check a quote before you accept it.