For most homes, a well‑designed traditional extension usually adds the highest, most predictable uplift in value, because it is treated as fully integrated living space in estate agents’ eyes. A good orangery can still add impressive value and appeal, often at a lower build cost, but its impact depends more on design, build quality, and how convincingly it feels like a “proper room” rather than a fancy bolt‑on.
Orangery vs extension: what are they?
An orangery sits somewhere between a conservatory and a full extension. It typically has a solid brick or rendered base, substantial pillars, and a solid perimeter roof with a large glazed lantern or roof lights. That mix of masonry and glass gives it a bright, garden‑facing feel, but with better insulation and year‑round usability than a basic conservatory.
A traditional single‑storey extension is built more like the rest of the house: full walls, conventional roof structure, and standard windows or wide glazed doors to the garden. From a surveyor’s point of view it is simply extra internal floor area, normally counted fully in the property’s overall square metreage and layout. That integrated, “feels like it has always been there” quality is a big part of why extensions can score so well on valuation.
How each option adds value
When buyers and valuers look at an orangery or an extension, they are essentially asking three questions: how much extra usable space is there, how comfortable and flexible is that space, and how well does it suit the style of the house.
A well‑executed orangery is widely reported to add in the region of around 7–15% to a home’s value, with some sources quoting up to 20% in the right area and at higher price points. Its selling power comes from the combination of extra floor area, abundant natural light, and a strong “wow factor” that photographs beautifully in listings and stands out on viewings. Buyers often see a glazed, garden‑linked room as a lifestyle upgrade: somewhere to dine, relax, or work while still feeling connected to the outdoors.
Traditional single‑storey extensions are often quoted as adding roughly 10–20% to a property’s value, again depending on size, finish, and location. Because they are usually fully integrated into the existing layout with matching heating, insulation and finishes, they function as straightforward extra living space: a bigger kitchen‑diner, an extra reception room, or a more generous family room. That “proper room” feel, with no compromises on temperature or usability, tends to be valued highly and consistently in mainstream markets.
Cost vs value: what you get for your spend
To decide which route adds more value for you, it helps to weigh typical costs against likely valuation uplift.
Recent UK orangery cost guides suggest that an average orangery sits somewhere around £30,000–£35,000 at the mid‑market level, with smaller, simpler designs sometimes starting lower and larger, more bespoke builds easily climbing towards £60,000 or more. That puts a good orangery in the same ballpark as a modest extension, but generally a little cheaper than a full‑spec, masonry‑heavy build of equivalent size.
By contrast, small single‑storey extensions are often quoted from roughly £40,000–£56,000 for around 20 m², with costs rising significantly for larger footprints and higher‑end finishes. On a cost‑per‑square‑metre basis, a traditional extension is usually more expensive to build than an orangery, because of the level of structure, integration and finishing work required.
If, for example, a well‑designed orangery at £40,000 adds around 10% to a £400,000 home (roughly £40,000), you can in theory recoup a large proportion of the outlay on paper, while also enjoying the space in the meantime. A similar‑cost extension that delivers a bigger, better kitchen‑diner and pushes the same house up by 12–15% could edge ahead financially, especially in areas where buyers strongly prioritise “proper” internal space.
Design, usability and buyer appeal
The headline percentages only tell part of the story. How the new space looks and works day‑to‑day has a huge influence on both valuation and buyer demand.
Orangeries excel at delivering light‑filled, visually striking spaces that feel special. The combination of a roof lantern, tall glazing and views over the garden can make even a modest footprint feel luxurious, particularly on period properties where a full modern extension might look too heavy. For buyers who fall in love with that sense of light and openness, an orangery can tip the decision between similar homes and justify a higher price.
However, if the orangery is poorly specified – too much glass, not enough insulation, or weak heating – it risks being seen as a pretty but underused room that is too hot in summer and too cold in winter. In those cases, the perceived value drops sharply, and surveyors may treat it more like an upgraded conservatory than fully fledged living space.
Traditional extensions, when well designed, tend to offer more predictable usability. With insulated walls, a conventional roof, and standard heating and electrics, they behave just like the rest of the house, making them ideal for enlarging kitchens, creating open‑plan living areas, or adding home offices and playrooms that work all year round. Buyers who prioritise practicality and storage often see this as a safer, more obviously valuable upgrade than a predominantly glazed addition.
That said, a boxy, dark extension that steals light from the existing rooms or feels disconnected from the garden can actually harm a home’s appeal, even if it increases the square footage. As with orangeries, thoughtful design – roof lights, wide doors to the garden, good flow from old to new – is what unlocks the strongest value uplift.
So which adds more value overall?
Looking purely at typical UK figures, the balance usually tilts slightly in favour of a well‑executed traditional extension for maximum, bankable value, especially on standard family homes where extra integrated living space is top of buyers’ wish‑lists. Extensions are more consistently treated as part of the core house, with a fairly direct link between added square metres and higher valuations.
However, a high‑quality orangery can match or even outperform a basic extension in some situations, particularly on character properties or in higher‑value markets where design, light, and “wow factor” carry a premium. In those settings, an orangery that feels like a natural, luxurious continuation of the home – with solid thermal performance and a beautiful connection to the garden – can command a very strong return relative to its build cost.
For South Yorkshire homeowners, the most sensible way to choose is to start with the primary goal. If the priority is a bigger, more functional kitchen‑diner or extra everyday living space that will appeal to the widest pool of buyers, a traditional extension is often the better fit.
If the aim is a standout, light‑filled room that transforms how you use the garden side of the house and adds a touch of luxury, an orangery may be the more attractive and cost‑effective route – provided it is designed and built to a good standard that local buyers will recognise and value.king to a local installer can help clarify options before you sell.