How much does a conservatory cost in 2025?

The price of a new conservatory or orangery varies dramatically based on what type of structure you choose, how big it is and what materials it's made from. But there are things you can do to keep the costs down and stay within your budget.

We've worked with the Building Cost Information Service to bring you the average cost for three different sizes of conservatory. Plus, we've contacted conservatory firms across the UK, grilled experts and got the lowdown from more than 100 conservatory owners, to find out how you could save money.

Keep scrolling for our research and tips on how to choose the right type of conservatory for your home and budget.

Not sure if a conservatory is the right solution for your home? Be inspired by our house extension and conversion ideas

How much does a conservatory cost?

Conservatory prices vary considerably, and it can be hard to know whether you're getting a good deal. That's why we've worked with the Building Cost Information Service (BCIS), which publishes average building work and repair costs, to bring you the average price of a conservatory*.

The costs below are based on a standard conservatory with a glass roof and 600mm-high (dwarf) brick walls on all three sides. Estimated totals include the conservatory itself and installation. 

We have costs for two different types of structure:

• Type 1: Conservatories (or garden rooms) that are fitted to the back of a house and accessed through an existing door.
• Type 2: Conservatories (or garden rooms) with a new opening that are integrated into your home through a pair of glazed doors.

Type 1

Including electrics and radiator (doesn't include forming an opening in an existing wall):

• 3 x 3 metres
• 4 x 4 metres
• 6 x 4 metres

Type 2

Including forming an opening in an existing external cavity wall, plus a new pair of glazed doors, electrics and radiator:

• 3 x 3 metres
• 4 x 4 metres
• 6 x 4 metres

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How much does it cost to replace a conservatory roof?

If you just need a new roof for your conservatory, this is significantly cheaper than rebuilding the whole structure. These costs include removing the existing glass roof, replacing it with a new roof and making good. 

• 3 x 3 metres
• 4 x 4 metres
• 6 x 4 metres

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How much does a garden room attached to the house cost?

Garden rooms can provide a distraction-free working space, but they don't come cheap. If you're thinking of building one, you need to know how much you should set aside for the project.

Working with BCIS, we've rounded up estimated costs for the following garden room floor sizes:

• 3 x 3 metres
• 4 x 4 metres
• 6 x 4 metres

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Is a conservatory cheaper than an extension?

Building an extension is usually more expensive than adding a conservatory to your home. You'll likely need to use pricier materials and there might be increased labour costs due to the scale of the project.

Before you begin the project, consider VAT and the fact that most builders take payments in stages. Working with a building contractor or architect will cost you more, too.

For the latest pricing data, consult our guide to extension costs for 2025.

Which type of conservatory is cheapest?

There are a lot of options for the type of conservatory you get and materials you can use. If you want a conservatory that's more like an extension with a solid roof, then you can expect to pay more. 

You can also get more basic types of conservatory, which are all glass, without any brickwork. This type is typically cheaper than the prices in our table, depending on what other options you go for.

Glass vs polycarbonate conservatory roofs: which is cheaper?

A polycarbonate plastic roof is likely to be cheaper than a glass roof, but the experts we spoke to warned this could be a false economy. Polycarbonate roofs can be noisier and less efficient at keeping the room at a consistent temperature. They also let in less light.

Some of the people we spoke to also recommended solid roofs to help control extreme temperatures - although these can make the rest of your home feel darker.

Top tip: Splashing out on specialist glass can be worthwhile. Glass technology has evolved considerably over the past few years and now includes thermally efficient and self-cleaning types.

Tinted glass can also make a difference when it comes to glare. Although, depending on what blinds you plan to use and the direction your conservatory faces, it may not be necessary.

To help you decide which structure you need, read our guide to the types of conservatory

Will my conservatory or orangery affect my home insurance

Your insurer needs to know about any changes that alter your home’s structure, habitability, security or value. Adding a conservatory or orangery will give you additional space in your home and may increase its value. These changes will likely affect your buildings and contents insurance premiums.

Give your insurer several weeks’ notice. If you forget to tell them about changes to your home then the terms of your policy may be invalid when you try to make a claim.

How to choose a conservatory company

Make sure you shop around and always get at least three quotes. If possible, use a firm recommended by a friend or family member, or a local, trustworthy Which? Trusted Trader. Our Trusted Trader endorsement scheme recognises reputable traders who successfully pass our rigorous assessment process. 

National vs local conservatory firms

There are a few options when choosing a conservatory firm. You can:

• Buy off-the-shelf and install your conservatory yourself
• Buy a package from a local conservatory installer
• Buy your conservatory from one local company and get it installed by another
• Go to a major national brand such as Anglian Windows, Everest, Sehbac or Ultraframe for the whole package.

Some people like bigger brands because of their consistency and experience. Others prefer local firms for their more individual service. 

If you go local, you’ll also have to decide whether to pick an independent conservatory firm or a local builder, who is likely to have a wider range of skills than simply building conservatories. This may be good if your build is more complex or larger than average. 

Not all companies selling conservatories will install them. Make sure you check whether the company you buy your conservatory from will also do the installation. If they don't, get recommendations for local installers and check whether installation is included in your quote.

Conservatory accreditation

Look for a member of the Windows, Doors & Conservatories Group. A division of the Glass and Glazing Federation (GGF), it addresses all areas of window, door and conservatory manufacture and installation with the aim of promoting high standards in the industry.

GGF members have to meet a stringent series of tests and follow the organisation's code of good practice. It also offers a free conciliation service in case of any dispute about the level of workmanship.

Also, if possible, pick a Which? Trusted Trader. Our endorsement scheme recognises reputable traders who successfully pass our rigorous assessment process. Use the Which? Trusted Traders tool to find a reliable trader near you:

It's also worth checking whether the company you are buying from is FENSA (Fenestration Self-Assessment) registered. FENSA was set up to improve energy standards, so it's a good way to ensure your conservatory is energy efficient. 

For conservatories that need to comply with building regulations, a FENSA certificate is essential.

Questions to ask when hiring a conservatory company

Below is a list of questions that you should ask the sales company or the installer when you buy a conservatory.

• Does the quote include installation, planning permission, heating, plastering, and digging a foundation?
• Will the installation be done by you or a third party company?
• Is the firm accredited by an industry body?
• How long will the construction process take, and how many people will it involve?
• Do I need to be at the property at the time of installation?
• Will you need space for a skip?
• Will any damage in the garden be made good once the work is finished?
• Where will sockets, radiators, doors, and the TV aerial be located?

During construction

How long will it take? 

Typical average-sized conservatories take between three and four weeks to build, including all snagging and finishing off. Large projects could last around six weeks.

Construction work will usually begin with the base, and tends to involve builders being on site for about about three days. 

During this time they will clear the ground, dig the footings, lay the base layers and level the floor before building the walls. Normally the building work would then be left for a few days – ideally over a weekend – to settle. 

During the second week the frames will go up and be glazed, and any electrical work started.

This is followed by plastering the walls (if necessary), finishing off the electrical work and then adding the flooring, Depending on what type of floor you choose, as well as the time of year, it's sometimes best wait a few weeks to let the floor dry out thoroughly first. 

How disruptive will it be?  

You'll probably want to meet the team on the first day, but a reputable company shouldn't need you to be at home for the duration of the work. 

If side access is good, disruption should be minimal. It helps if you have outside water and electrical facilities.

Be aware that your power supply may need to be switched off while the electrical work is done, and your garden may suffer some damage due to the number of people coming in and out. Boards should be used in the garden and then taken up overnight to allow the grass to grow.

Top tip: Don't panic when the base goes down and it looks small. Experts we spoke to say it always looks smaller than you expect at this stage – it will feel bigger as the frames go up. 

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*Data sourced from the Building Cost Information Service (BCIS) database, where costs are collated from a variety of sources and analysed.

Materials costs are based on the best trade prices from a range of suppliers across the UK, which are then benchmarked to reveal the best national average. Labour rates are based on the current Building and Allied Trades Joint Industrial Council wage agreement. It then uses this data in a standardised model of the average conservatory types. Data copyright BCIS 2024, reproduced with permission. Data is current as of November 2024.

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