A true orangery is defined by its combination of solid masonry walls, symmetrical brick piers, large glazed windows, and a distinctive central roof lantern sitting above a solid insulated perimeter roof. Many homeowners across Warrington, St Helens, and Wigan confuse a conservatory fitted with a tiled roof for an orangery. The two are fundamentally different structures. This orangery design features checklist walks you through every defining element, from Building Regulations compliance to cost ranges, so you can make a confident, informed decision before committing to your project.
1. The orangery design features checklist: core architectural elements
A true orangery is defined by a specific set of architectural features that set it apart from both conservatories and standard extensions. Getting these right from the start determines whether your build qualifies as a genuine orangery or simply a well-dressed conservatory.
The defining features are:
- Solid masonry walls and brick piers. Masonry covers 40–50% of the external walls, providing thermal mass, structural integrity, and a room-like feel that glazing alone cannot deliver.
- Central glazed roof lantern. The lantern sits above a solid, insulated flat or slightly pitched perimeter roof. This is the single most recognisable feature of a true orangery.
- Large glazed windows. Classical sash or multi-pane styles are traditional, though modern orangeries often use slim-profile aluminium frames with double or triple glazing.
- Solid perimeter ceiling inside. A plastered internal ceiling surrounds the lantern, boosting thermal mass and creating a proper room atmosphere rather than the greenhouse feel of a conservatory.
- Symmetry and proportion. Classical orangery design follows balanced proportions. Brick piers are evenly spaced, and window bays mirror each other across the structure.
- Energy-efficient glazing throughout. Windows and the lantern must meet current thermal performance standards under Building Regulations Part L.
Pro Tip: If the structure you are looking at has no central roof lantern and no solid perimeter ceiling, it is not a true orangery regardless of what it is called in a brochure.
Symmetrical brick piers and solid perimeter ceilings are what give orangeries their room-like ambience. That quality of feel is what separates them from conservatories and justifies the additional investment.
Roof being built on a true Orangery in Culcheth
2. How orangeries compare to conservatories and extensions
Understanding the differences between these three options helps you choose the right structure for your home and budget.
Glazing and wall proportions
A conservatory typically uses 75–100% glazing across its walls and roof. An orangery sits at roughly 50–60% glazing, with the remainder made up of solid masonry. A standard house extension uses predominantly solid walls with conventional windows. The proportion of glazing directly affects thermal performance, natural light levels, and how the space feels in use.
Roof construction
The conservatory roof is glazed or polycarbonate, which performs poorly in cold and hot weather alike. A glazed roof typically achieves U-values of 1.2–2.0 W/m²K, meaning significant heat loss in winter and overheating in summer. An orangery’s insulated perimeter roof with a central lantern achieves around 0.18–0.25 W/m²K. That difference translates to a genuinely usable room throughout the year.
Cost comparison
| Feature | Conservatory | Orangery | Standard extension |
|---|---|---|---|
| Typical glazing proportion | 75–100% | 50–60% | 10–20% |
| Roof type | Glazed or polycarbonate | Insulated with lantern | Tiled or flat |
| Typical cost (14–20m²) | £13,000–£22,000 | £28,000–£45,000 | £28,000–£42,000+ |
| Build time | 3–6 weeks | 8–18 weeks | 10–20 weeks |
| Building Regs required | Sometimes exempt | Always required | Always required |
| Resale value added | Around £5,000 | £12,000–£25,000 | Varies |
Orangeries add £12,000–£25,000 to resale value on average. That figure reflects their better thermal efficiency, perceived permanence, and closer integration with the main house.
Build time and disruption
Orangeries take 8–18 weeks to build compared to 3–6 weeks for a conservatory. The additional time comes from brickwork, insulated roofing, and full Building Regulations compliance. Homeowners in Wigan and St Helens should factor this into their planning, particularly if the project affects a main living area.
3. Planning permission and Building Regulations for orangeries
Orangeries are legally classified as habitable extensions under Building Regulations Approved Document L. This means they must meet the same thermal, structural, and ventilation standards as any other room in your home. Many conservatories are exempt from Building Regulations if they are separated from the main house by an external-quality door and wall. Orangeries receive no such exemption.
Key compliance points to check:
- Planning permission. Most orangeries fall within Permitted Development rights, but you must check if your property is in a conservation area, is listed, or has had previous extensions that have used up your permitted development allowance. Planning an orangery in 2026 requires early confirmation of your permitted development status.
- Part L (energy efficiency). Walls, roof, and glazing must all meet minimum U-value targets. The insulated perimeter roof is critical here.
- Part F (ventilation). Adequate ventilation prevents condensation and overheating. Trickle vents in window frames and roof lantern openers are standard solutions.
- FENSA certification. Any replacement or new windows must be installed by a FENSA-registered contractor or separately approved by your local authority.
- NAPIT certification. All electrical work, including lighting circuits and underfloor heating, must be certified under Part P of Building Regulations.
- Structural calculations. The solid roof and brick piers require engineer-approved structural drawings before work begins.
Pro Tip: Ask your builder to confirm Building Regulations approval in writing before work starts. A completion certificate at the end of the project protects you when you come to sell.
Natural light is one of the primary reasons homeowners choose an orangery. Design trends in 2026 increasingly prioritise natural light as a core element of healthy, comfortable living spaces, and the orangery’s lantern roof delivers exactly that without compromising thermal performance.
4. Common orangery design mistakes to avoid
The most frequent mistake is confusing a conservatory with a tiled roof for a true orangery. A solid tiled roof alone does not create an orangery. Without brick piers, a masonry base, and a central glazed lantern, the structure is simply a conservatory with a replacement roof.
Other mistakes that undermine both appearance and function:
- Over-glazing. Replacing too much wall with glass reduces thermal mass, drives up heating costs, and makes the space uncomfortable in summer. Stick to the 50–60% glazing ratio.
- Ignoring symmetry. Uneven pier spacing or mismatched window bays create an awkward appearance that clashes with the main house. Symmetry is not decorative; it is structural to the orangery’s character.
- Poor integration with the roofline. The orangery must sit comfortably against the existing house. A poorly positioned flat roof that cuts across a window or blocks a chimney looks wrong and can cause water ingress.
- Insufficient insulation. Cutting costs on roof or wall insulation leads to overheating in summer and heat loss in winter. The difference in U-values between a well-insulated orangery and a glazed conservatory roof is significant enough to affect your energy bills every month.
- Neglecting furniture placement. Solid walls in an orangery give you real options for furniture, shelving, and radiators. Many homeowners fail to plan for this during the design stage and end up with a room that is difficult to furnish.
Pro Tip: Use the solid perimeter walls to position a sofa or dining table away from the glazing. This creates a genuinely comfortable room rather than a glass box with chairs pushed to the edges.
The difference between a conservatory and an orangery comes down to materials, proportions, and roof design. Getting those three things right from the outset prevents expensive corrections later.
Key takeaways
A true orangery requires masonry walls covering 40–50% of the structure, a solid insulated perimeter roof with a central glazed lantern, and full compliance with Building Regulations Parts L and F to function as a genuine year-round living space.
| Point | Details |
|---|---|
| Masonry is non-negotiable | Brick piers and solid walls must cover 40–50% of the structure to qualify as a true orangery. |
| The roof lantern defines the orangery | A solid perimeter roof with a central glazed lantern is the single most distinctive feature. |
| Building Regs always apply | Orangeries are habitable extensions and must meet Part L and Part F standards without exception. |
| Orangeries add more resale value | A well-built orangery adds £12,000–£25,000 to property value compared to around £5,000 for a conservatory. |
| Symmetry and proportion matter | Balanced brick pier spacing and matched window bays are structural to the orangery’s design, not just aesthetic. |
What 35 years of building orangeries has taught me
I have seen homeowners arrive at a consultation convinced they want an orangery, only to describe something that is closer to a conservatory with a solid roof. The confusion is understandable. The market is full of products that borrow the word “orangery” without delivering the structure. My honest view is that the lantern roof is the line in the sand. If a builder is not proposing a central glazed lantern above a solid insulated perimeter roof, they are not building you a true orangery.
The other thing I would say from experience is that Building Regulations compliance is not a box-ticking exercise. Homeowners who cut corners on insulation or skip proper ventilation end up with a room that is too hot in July and too cold in january. We have been called in to correct this more times than I care to count, particularly in older properties across Warrington and Rainhill where previous extensions were built before current standards applied.
Budget is always a consideration. An orangery costs more than a conservatory upfront, and the build time is longer. But the resale value, the year-round comfort, and the quality of the finished space make it the better long-term investment for most homeowners. The regret I hear most often is not “I wish I had spent less.” It is “I wish I had done this sooner.”
Work with a builder who understands the structural requirements, has experience with Building Regulations approval, and can show you completed orangery projects. The open-plan integration of an orangery with your main living space is only as good as the quality of the build behind it.
— Gareth
Planning your orangery with Complete-Property-Solutions
Complete-Property-Solutions is a family-run building company with more than 35 years of experience delivering bespoke house extensions across Warrington, St Helens, Wigan, Great Sankey, Penketh, Culcheth, Lowton, and the surrounding areas. We manage every orangery project from initial design through to Building Regulations sign-off and final completion, so you have one trusted team throughout.
Large 4 pane Patio Doors in to the front of an Orangery in Culcheth
We are members of the Guild of Master Craftsmen, approved UltraRoof installers, and authorised REHAU installers. Every project comes with a transparent fixed-price quotation and clear communication at every stage. If you are ready to discuss your orangery design, get in touch with our team for a no-obligation consultation. We will help you get the design right from the start.
FAQ
What is the difference between an orangery and a conservatory?
An orangery has solid masonry walls covering 40–50% of the structure and a solid insulated perimeter roof with a central glazed lantern. A conservatory uses 75–100% glazing with a fully glazed or polycarbonate roof, making it less thermally efficient and less suitable for year-round use.
Does an orangery need Building Regulations approval?
Yes. Orangeries are classified as habitable extensions and must comply with Building Regulations Parts L and F, covering thermal performance, insulation, and ventilation. Unlike some conservatories, they are never exempt.
How much does an orangery cost in the UK?
A typical orangery measuring 14–20m² costs between £22,000 and £32,000 in the UK. Costs vary depending on size, materials, glazing specification, and site conditions. Orangeries generally add £12,000–£25,000 to resale value.
How long does it take to build an orangery?
Orangeries typically take 8–18 weeks to build, compared to 3–6 weeks for a conservatory. The additional time reflects the brickwork, insulated roofing, and Building Regulations compliance involved.
Do I need planning permission for an orangery?
Most orangeries fall within Permitted Development rights and do not require planning permission. You will need to apply if your property is listed, sits in a conservation area, or if previous extensions have used your permitted development allowance. Always confirm your status before work begins.
