Thinking About a Sunroom Extension? Why Most UK Homeowners Actually Want an Orangery

When the search term ‘sunroom’ yields everything from a bolt-on temporary glazed room to an elegant orangery extension, finding the right home extension for you can be an impossible task.

Browsing online for inspiration for a top-performing home extension can muddy your search with interchangeable terms and a lack of clear definitions. Many UK homeowners are restricted to USA-focused articles that don’t resonate with them, and as a result, are hindered in their search. This guide covers what a sunroom extension actually means in the UK, how different build approaches perform in British weather, and why an orangery is likely the better option for the space you have in mind.

We also look at the difference between a sunroom and an orangery, and help homeowners to find the extension that will suit their lifestyle and home best.           

What People Usually Mean When They Search “Sunroom Extension UK”

Homeowners searching for a sunroom are looking for a bright, light-filled way to extend their home that flows seamlessly with their existing property. Instead, they’re met with cheaply made and poorly built bolt-on extensions that provide a very short-term solution to a long-term goal.

What is a Sunroom?

Sunrooms are one of the lowest-cost home extensions, but ‘extension’ is a very loose term; in practice, they rarely feel like a true part of the home. A sunroom is a lightweight, prefabricated glazed structure attached to the outside of a property, typically bolted onto the existing brickwork with minimal to no groundwork. While the large amounts of glazing create a bright, garden-facing space, the lack of proper insulation and solid construction means the room is largely at the mercy of the British climate.

When you’re seeking a functional, comfortable living space such as a dining room, kitchen extension or lounge, rather than a temporary, seasonally restrictive room, search instead for an orangery extension.

What is an Orangery Extension?

Orangeries originated as semi-glazed extensions that protected wealthy homeowners’ exotic plants during the colder months. They were, and still are, symbols of opulence and grandeur. The contemporary orangery extension can be categorised by its flat roof, grand ceiling-height glazing and pitched roof lantern. Westbury orangeries are excellent at welcoming in abundant natural light into kitchen extensions, dining and living areas, creating a comfortable heart of the home to be enjoyed all year round.

Sunroom Additions vs Sunroom Extensions

The word “sunroom” covers a wide spectrum of builds. At one end, sunroom additions are typically bolt-on, pre-fabricated, and lightly constructed, designed to be installed quickly rather than built to last. At the other end, a sunroom extension could imply something more permanent, a proper structural addition with foundations, integration into the existing property, and materials specified for long-term performance. The problem is that both are sold under the same terms, which makes comparison difficult and makes it hard to set expectations accurately.

Sunrooms vs Orangeries: What are you actually looking for?

A sunroom is…

• A cost effective, temporary and seasonally limiting glazed room
• A room that is separated from the property by external doors
• A way to extend the home without professional building work, often involving simple bolts into the existing brickwork

Sunrooms make sense when:

• You are working to a strict budget as opposed to a standard
• You don’t anticipate your additional room to be used daily or year-round
• You don’t care about home aesthetics and instead prefer a quick, instant fix

An orangery is…

• Solid construction and a permanent addition to the home
• Most often an open plan space that is not separated by external doors
• A way to extend the home that is functional all year round, combining top performing materials with high quality craftsmanship

You should opt for an orangery if:

• You desire a top quality home extension that will be used daily and is comfortable throughout the year
• A grand scale home improvement aligns with your overall goals with your property
• You’re seeking a timeless extension that is designed to suit both your personal needs and the style of your property
• You want to furnish your additional room with regular furniture without the worry of concentrated sun damage

Why Sunroom Additions Fall Short in the UK Climate

Bolt-on sunrooms are fully glazed rooms that are improperly insulated. In the summer, the high levels of glazing create intense, unregulated heat, and a lack of proper ventilation means these rooms will become stuffy and uncomfortable. In the winter, the glazing provides little to no protection from freezing temperatures, making comfortable lounging in your sunroom impossible.

Year-round, season-proof comfort in a glazed home extension comes from expert architectural design, suitable insulation and advanced glazing technology. Westbury orangeries deliver on all of these factors and offer exemplary performance. Below, we delve into this a little bit deeper.

Glazing Technology Advancements – Westbury orangeries are double-glazed with an additional low-emissivity coating to retain internal radiant heat (such as your central heating). In the summer, this coating helps reduce heat build-up, but for optimal performance, upgrading to solar-control glass further reduces this. To explore our glazing options and upgrades, call our sales and design team today for personalised advice.

Roof Insulation Solutions – Westbury orangeries have built in PIR insulation boards fitted into the flat roof, greatly reducing the amount of heat escaping. This is an integral part of the design for UK homes, and helps to maintain regular, suitable living conditions no matter the weather outside.

Top Performing Timber – Westbury orangeries are carefully crafted from high-performance timber. Timber is a natural insulator, but our timbers of choice offer more than just thermal efficiency. We use an engineered combination of Redwood and Accoya laminated sections in all of our projects.

Redwood is used internally for its naturally tight, attractive grain, which makes paint application smooth and of a high standard. Accoya is used externally for its exemplary durability and dimensional stability, boasting both longevity and weather-resistance simultaneously. You can read more about why we choose Accoya here.

Why Sunroom Additions Don’t Feel Like a True Extension

Beyond temperature, lightweight sunrooms tend to feel disconnected from the home in every sense — the materials don’t match, the acoustics differ, and the all-around glazing can feel exposing rather than comfortable. Being separated from the main property by an external door only adds to this sense of detachment. When a room doesn’t feel like a natural part of the home, it rarely gets used as one.

Consider whether a sunroom is worth the hassle, or whether a lack of use throughout the year undermines the point of purchasing one entirely. You should also take into account the longevity of your sunroom – will it need replacing short-term due to cheap manufacturing and low quality materials?

If your goal is a long-term home extension, it’s worth weighing up whether higher upfront costs will lead to less upheaval and negate replacement or repair costs down the line. The saying that ‘you get what you pay for’ is painfully true, as opting for cheap temporary solutions will only lead to a lack of value in terms of use and property value. In fact, a cheap sunroom could actively harm the appeal to future buyers, acting as an unfair reflection of the entire property.

Why Most Homeowners Actually Want an Orangery

The “Sunroom Feel” With Better Year-Round Performance

Orangeries are inherently light-filled extensions, designed to encourage in floods of natural light through a combination of the overhead roof lantern and tall, ceiling height glazing. As such, homeowners will experience that bright, warm and uplifting effect, all whilst still maintaining comfortable temperatures and keeping sheltered from harsh sunlight.

As your orangery is another room in your home, it’s a sensible idea to consider an orangery heating method for the colder months. Heating solutions for orangeries include trench heating, underfloor heating and fireplaces/log burners. To delve deeper into these options, read our blog ‘Heating Your Orangery Extension’.

What Makes an Orangery Different (In Practical Terms)

Planning Permission, Foundations & Approvals

Sometimes, you can proceed with an orangery build without having to request planning permission, but you must adhere to permitted development criteria. In simple terms, this means that:

• The orangery must not exceed 4m outward from the existing property for a detached house, or 3m outward for semi-detached and terraced houses
• The height of the orangery (including the roof lantern) must not exceed 3m from ground level
• Less than 50% of the curtilage (what the council accept as the area of land immediately surrounding the property – this is subject to change) is taken up by extensions or outbuildings

This just covers the basics, and we always recommend consulting a professional in every instance as other criteria may come into effect depending on individual proposals.

Planning permission requirements for an orangery extension depend on your property type, location, and the scope of the build. In many cases, works can proceed under permitted development rights, but this isn’t guaranteed, particularly for listed buildings, properties in conservation areas, Green-Belts or National Landscapes. We always recommend speaking to a specialist early in the process to confirm what applies to your specific proposal.

Foundations and Permanence

One of the key differences between a lightweight sunroom addition and a permanent home extension is what sits beneath it. A properly built orangery is set on solid brickwork and structurally tied into the existing property, this is what gives it the thermal stability, acoustic consistency, and the feeling of being a genuine room rather than an afterthought. It’s also what underpins long-term durability and the sense that the space was designed to last.

Costs Explained Without Anchoring to Cheap Builds

What Drives the Cost of an Orangery Extension?

Orangeries are fully personalised home extensions, which means that quotes can differ greatly depending on various details. For two different orangery builds of the same square meterage, the price may be vastly individual.

Below is a simplified guide of what may increase the cost of an orangery, but this is not an exhaustive list. It’s always best to clarify with your designer if you’re uncertain about how specific inclusions will affect cost.

• Quantity of decorative pilasters and entablature
• Quantity of windows and the style of your joinery
• Quantity of roof lanterns
• Opening roof vents integrated into roof lanterns
• Dual colour schemes
• Intricate detailing to match the existing property
• Feature breakfronts

Remember to compare what is included in each orangery quote as opposed to taking both prices at face value. If you’re concerned about costs, by reducing the above, you could save on your orangery quote to better align with your goals.

Budgeting for a Space That Adds Long-Term Value

Orangery extensions add more than just financial value to your property, they drastically elevate your lifestyle at home. Westbury orangeries are built to last, designed to be a revolutionary living space to be enjoyed for years to come. By making an investment into your home with an orangery, you’re making a smart decision for your future, not just for short-term enjoyment.

Real-World Use Cases (What People Want Their “Sunroom” To Do)

Dining Rooms That Stay Comfortable Year-Round

Dining rooms that remain comfortable throughout the seasons are integral to comfortable living, allowing you to host guests and make memories with your family without concerns of disuse during the warmest months. Orangeries, with their flat roofs that provide shelter from the high sun and roof lanterns that encourage in comfortable levels of bright natural light, are the ideal solution for this.

Kitchen and Open-Plan Living Extensions

Extending your home with an open-plan orangery is a great consideration for the modern day home. Open-plan living allows you to get the most out of your space, enhancing flow and optimising your layout. An orangery kitchen extension allows you to connect your kitchen and dining spaces in a visually appealing, prestigious way, all whilst maximising natural light inside your home.

Family Spaces You’ll Actually Use

Orangeries are thoughtfully designed rooms that you will genuinely want to be in. This considered family space will be personalised to suit the needs of you and your family, providing the ideal individualised hub for daily living.

Frequently Asked Questions About Sunroom Extensions

So, What Are You Really Looking For?

For most UK homeowners, searching for a sunroom extension reflects a genuine desire for more light, a better connection to the garden, and a comfortable space that works as a real part of the home. Whether that’s best achieved through an orangery extension or another approach depends on how you want to use the space and what level of performance you need from it year-round. If an orangery sounds like the right direction, the next step is straightforward.      

To explore your orangery design options, request a Westbury brochure today. Reach out to our expert sales and design team to discuss what would work best for you and your home.