What Is The Cost Of An Orangery Or Garden Room?

“The bitterness of poor quality remains long after the sweetness of low price is forgotten” Benjamin Franklin

This quotation rings true whenever we begin to discuss guide prices, quotations and even when catching up with clients 20+ years on. Throughout the process of buying an orangery, this should be at the forefront of your mind, not only ‘What is the cost of an orangery?’ but also, ‘Am I getting the best value for my money?’

Whether you’re in the early stages of researching the cost of building an orangery or you’re ready to request a guide price, understanding the average cost of an orangery extension and the factors that influence it is the essential first step.

We caught up with Sales Manager Emma to understand more about the average cost of a tailored orangery and what can impact the price.

How much do orangeries and garden rooms cost?

Emma starts by explaining that ‘Our prices start from around £65,000 + VAT and prices largely vary due to the size of the extension. The approximate average cost of a Westbury orangery is about £80,000 to £100,000 with an average size of around 40-50m_².

For those asking how much a smaller project might be, the cost of a small orangery typically starts from around £65,000 + VAT, though even compact builds are fully tailored and priced accordingly. ‘The total price will ultimately come down to how many sides of joinery there are and the customisable options the customer chooses. These prices account for several integral parts that make a Westbury Orangery different.’

So, how much do orangeries cost overall? While prices naturally vary, most clients invest between £80,000 and £100,000 for a mid-sized build, with smaller projects starting below that range and larger or more complex builds exceeding it.

What can affect the cost of an orangery extension?

‘As with any tailored building project, many factors can bear an impact on price.’ Emma explains some of the most common reasons you might see an increase in the price of an orangery. ‘Any number of unique or extra design points can influence the cost. But as a general rule, the following design details can affect the price:

• Number of sides of joinery
• If a breakfront is wanted
• Number of roof lanterns & roof vents
• Clerestory windows (also known as fan lights) and panelling 
• Loggia (outside covered area)
• Number and style of windows and doors
• Number and style of pilasters’
• If you wish to have the same colour internally and externally

Building to a standard, not a budget

When it comes to home investments, such as building an orangery, price and value for money are everything. Corners are never cut to increase profits, and clients are never upsold with unnecessary additions. The process is consistent, the same quality, materials and dedication applied to every project, big or small. Tailored to your exact wants and needs.

‘Because no two orangeries or garden rooms are alike, we often request information from our clients to help draw up an approximate guide price. So that they’re able to consider the full budget of their project before making any commitments. Our aim is to deliver complete transparency, thorough, tailored advice and information for each project, and clear communication.’

What is included in the price of a Westbury orangery?

‘We offer a full design, manufacture, supply & install service. This involves several teams within our offices working collaboratively to design and draw your project, apply for planning permission on your behalf (if required), and install the timber and glass structure, ensuring it is fully watertight.

We also support your builder with all associated building work, including foundations, masonry walls, plumbing, electrics, and plastering. Providing them with a helpful ‘Working together’ document, scope of works, detailed drawings, and direct contact with a member of our team, enabling the build to run smoothly and be carried out to the specified requirements.’

Our Timber

We aim to consistently deliver high-performing, long-lasting products. So the choice to manufacture our garden rooms using Accoya is the first step towards this goal. Accoya begins as PEFC– and FSC-certified Radiata Pine. These trees grow incredibly quickly reaching maturity after 10 years, making them an abundantly available and highly sustainable resource. In comparison, an Oak tree can take up to 100 years to reach maturity. The environmental benefits to using Accoya outweigh slow-growing hardwoods, woods treated with toxic chemicals, and non-renewable materials such as uPVC.

“Price is what you pay, value is what you get”

Warren Buffet

The Pine undergoes a chemical modification process, acetylation, which changes the material’s structure and results in Accoya, a highly durable, lightweight, and stable timber. The acetylation process alters the free hydroxyls within the wood into acetyl groups, reducing water absorption and making it more dimensionally stable and protected from rot and decay.

Our Glazing

Our glazing methods exceed the GGF (Glass & Glazing Federation) guidelines.

But why is that important? Because an alarming number of cheaper glazed rooms and extensions do not meet this standard. This means that many homeowners are unknowingly relying on subpar glazing to protect their homes, furnishings and families from the rain and cold weather.

Orangery vs Extension: What’s the Cost Difference?

One of the most common questions we receive is around the cost of an orangery versus a traditional extension. While a standard single-storey house extension might appear lower in cost on the surface, it’s worth understanding what you’re comparing it to

A traditional extension typically involves a more straightforward build with standard roofing and minimal glazing. An orangery, by contrast, is an architecturally-led structure, characterised by its substantial glazed roof, solid masonry elements, and hand-crafted joinery, designed to elevate your home rather than simply add square footage.

When homeowners weigh up the cost of an orangery vs an extension, the key differentiators are:

Longevity and craftsmanship, orangeries are built using Accoya timber and GGF-exceeding glazing, delivering lasting performance that a standard extension rarely matches
Design and light, the glazed roof and the considered proportions of an orangery create a uniquely bright, spacious environment that a conventional extension cannot replicate
Added value, a well-executed orangery complements your property and can significantly increase its appeal and desirability

If you’re weighing up both options, the team is happy to talk you through the differences in scope, specification and investment.

Are there any additional costs to account for?

‘When budgeting, we encourage clients to also factor in building works which typically start at £25,000 + VAT for simple base works, foundations, and finishing works, such as plastering and decorating. Electrical and plumbing work can be in addition to this. If demolition of an existing garden room is necessary, this can increase building works costs together with the need for piling if the ground is not stable or too soft.’ Emma continues, highlighting some of the expertise required to build an orangery.

‘Furniture, flooring, and interior finishes should also be factored in, and how much a client spends on these things will depend on the spec they decide to go for. We also encourage clients to push their budget as far as possible for these finishing touches to ensure they don’t compromise on the final look, and they maximise their enjoyment of their new room.’

Do You Charge More for Planning Permission or Complex Builds?

‘We do not charge more for obtaining planning permission or where there are certain planning restrictions. However, we do explain that if planning permission is not granted following receipt of the client’s deposit, we will return the deposit less a small retention to cover our costs for assisting with the planning. Generally speaking, this retention does not exceed £3,500.

Designers & Technicians within the team have many years of experience dealing with planning matters, and some initial advice is provided before a project goes ahead. Where the likelihood of obtaining planning permission is considered low, we will discourage a client from proceeding with a project, or agree on separate costs just in relation to planning before any deposit is paid.’

How to Get an Accurate Orangery Price

If you’re looking for an orangery price calculator or an instant online quote, it’s worth understanding why truly accurate pricing requires a more considered approach. Every orangery is tailored, varying in size, number of joinery sides, glazing specification, and design details, and an automated calculator simply can’t account for the variables that determine your final investment.

What’s offered instead is a straightforward, no-obligation guide price based on your specific project.
Here’s how it works:

Step 1: Share your project details, size, location, and any design ideas you have in mind
Step 2: A guide price is prepared, typically covering the structure and works scope
Step 3: You review before committing, no surprises, full transparency from the outset

There are several ways you can request a guide price from the team. You can email design@westburygr.com, call us on 01245 326500, or complete our online form to get started.

The quotation is comprehensive and details the specifications for each project. All costs are agreed at the Offer stage, so there are no unexpected additions down the line.

Ready to Find Out How Much Your Orangery Could Cost?

Whether you’re at the early research stage or ready to move forward, the team is here to help you understand the full investment required to build an orangery, from the structure itself to building works, planning, and finishing touches.