How Much Does a Conservatory Extension Cost in 2021? | Checkatrade
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Conservatory extension cost guide

If you’re keen to add another room to your house, a conservatory can be an effective way to do it. Not only can conservatories be a lot cheaper than some other ways of extending, but they’re also a great way of connecting the indoors to the outdoors and letting in heaps of natural light.

But how much does a conservatory extension cost? And is it really worth building a conservatory as opposed to a formal extension? Read on to find out.

How much does a conservatory extension cost?

Medium conservatoryLower rangeHigher rangeAverage cost
Lean-to conservatory£8,000£10,000£9,000
Edwardian-style conservatory£10,000£15,000£12,500
P-shape conservatory£14,000£18,000£16,000
Lean-to conservatory with basic kitchen and appliances£14,000£16,000£15,000
Edwardian-style conservatory with basic kitchen and appliances£16,000£21,000£18,500
Rebuild conservatory as a full extension£15,000£25,000£20,000

Building a conservatory will vary in cost depending on a number of factors. These include:

  • The size: A larger conservatory will cost more than a smaller one.
  • The design: Conservatories come in a number of designs, including lean-to, Edwardian and P-shape.
  • The materials: A uPVC frame will cost less than a wooden one, while polycarbonate glazing is less expensive than glass.
  • Your area: The cost of labour will vary depending on where in the UK you’re based.
  • Extras: Just like a regular room, conservatories require extras like lighting and flooring, which vary in price.

Cost for a conservatory extension

Lean-to conservatories are usually the cheapest design you can go for, costing an average of £9,000. At the other end of the scale, you’re likely to pay an average of £16,000 for a P-shape conservatory. Don’t forget that these prices don’t include any extras, such as lighting or underfloor heating.

Conservatory kitchen extension cost

Building a conservatory is a great way to expand the size of your kitchen – especially as large kitchen diners are becoming increasingly popular.

The cost of a conservatory kitchen extension will depend on whether you’re planning to install kitchen units and appliances into the conservatory part of the room, or whether you’re simply using the conservatory to open up your existing kitchen area, for example using the new space for dining.

If you want to install kitchen units and appliances in the conservatory itself, this will be much more expensive as it will involve installing a new kitchen. You’re unlikely to find one tradesperson skilled in installing both conservatories and kitchens, so you’ll probably need to employ two separate contractors.

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Converting a conservatory into an extension cost conservatory kitchen extension cost

Hoping to convert your conservatory into a ‘proper’ room? You’ll need to check whether your conservatory’s foundations are deep enough to carry the additional loads that a solid structure would come with. Unfortunately, many conservatories don’t have suitable foundations because they didn’t require buildings regulations approval when they were built.

If the foundations are suitable for reuse, you could spend as little as £5,000 to build up from the plinth wall around the base of your conservatory, using lightweight, insulated studwork faced with brick slips.

If the foundations aren’t suitable, you’ll have to rebuild the whole thing as a solid structure. This could cost anything from £15,000 to £25,000 but it could well increase the value of your house. Just remember to obtain Building Control Approval first.

If your conservatory is situated at the back of your house (as most are), you most likely won’t need planning permission. However, it’s always best to apply for a Certificate of Lawfulness from the council to confirm that planning wasn’t required.

Should I build a conservatory or an extension?

Extensions with modern glass roof window designs and well-framed aluminium windows may offer almost as much light as a conservatory and could perform better in terms of heating and cooling. Plus, contrary to what you might think, costs can look fairly similar depending on how busy local builders are.

If you do decide to go for a conservatory, we’d recommend getting suitable foundations designed so that it could be converted into a formal extension in the future if you wanted to.

Key takeaways

  • Conservatory costs vary depending on materials and design.
  • Remember to factor in extra costs such as lighting.
  • Converting a conservatory into an extension could add value to your home.

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