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Internal Conservatory Roof Insulation Cost & Prices 2022

If you’re using your conservatory all throughout the year then you’ll likely notice how hot it gets in summer and how costly it is to heat in winter.

Whilst high summer temperatures are to be expected in a conservatory (and partly what they’re all about), they can exceed an unbearable 40C degrees, which is not only pretty inhospitable but also potentially dangerous.

Conversely, heating a conservatory adequately in the winter is expensive. 

Roof insulation in a conservatory can help mitigate the extremes in temperature within a conservatory and make it a more hospitable room to use.

This article will cover what you can expect to pay for internal conservatory roof insulation, factors that can affect the cost and other common questions around roof insulation for conservatories.

Conservatory Roof Insulation Cost Guide

By compiling quotes from 5 conservatory specialists and 6 secondary sources, we generated these average conservatory roof insulation costs. 

Prices include materials and labour but not interior design (aside from plastering where applicable). Prices also assume that your original conservatory foundations will remain untouched. 

Conservatory SizeAluminium Panels Roof Insulation uPVC Roof Insulation Plastered Roof Insulation
3m x 2m £1000£1000£1,500
3m x 3m£1100£1,350£2,250
4m x 4m£2,750£3,250£3,750
6m x 4m£3,000£3,750£4,750+
8m x 4/6m£4,000£5,000£6,000+

Types of Conservatory Roof Insulation Fitting Methods

Conservatory roof insulation is fitted in replacement of/in addition to your existing conservatory roof. 

All 3 options operate under the same principle – your existing conservatory roof will be partly or fully replaced with highly insulative solid materials. 

Your new conservatory roof will be opaque, which is a minor sacrifice and you can still fit large skylights if you desire. 

It’ll only be the roof that is insulated, not the side windows – your new conservatory will somewhat resemble an orangery with a high-performance insulated roof. 

Insulated conservatory roofs can improve conservatory U-ratings by a factor of 10. It’ll be much easier to control the heat of your new insulated conservatory, both in winter and summer and heating bills will be slashed in winter. 

There are three main options:

Plastered conservatory roof insulation with uPVC/aluminium/composite/tiled roof

The outer roof will be replaced with new roofing material. The glass panels may or may not be removed – it depends on the insulation system used.

The key difference here is the interior, which will be plastered rather than panelled with uPVC. This will look like a conservatory with a permanent roof and plastered interior. The most comprehensive option. 

uPVC conservatory roof insulation on both the outer and inner

The outer panels will be replaced with opaque uPVC or polycarbonate panels and new inner panels will sandwich insulation between the interior and exterior.

This will essentially look like a standard conservatory with an opaque uPVC roof (typically white).

Insulate the roof with aluminium insulation panels

Here, the external roof panels will be covered with aluminium panels designed for thermal efficiency. This is perhaps the quickest method and the panels can be easily alternated with glass to retain the open aspect of a conservatory whilst bolstering energy efficiency. 

Types of Conservatory Roof Insulation Materials

As described, there are 3 main methods of conservatory roof insulation. 

Your conservatory specialist or contractor will be able to discuss your options, which may be limited by what size and type of conservatory you have (e.g. lean-to, Victorian, P-shaped, etc). 

Key questions to ask include how well the new roof will perform in terms of its energy efficiency, how long it will remain watertight and damp proof and how well sound insulated it is. Be on the lookout for guarantees on certain materials. 

Many conservatory specialists will have a portfolio of past projects and examples that you can look through for an idea of what the finished result will look like. 

Plaster Conservatory Roof Insulation 

Plaster roof insulations are the same as uPVC and aluminium roof insulations in principle, but instead of fitting uPVC panels under the insulation, the insulation will be plastered over. 

The conservatory roof itself will be replaced with a permanent, weatherproof material. The roof will have to be lightweight enough to remain compatible with the original foundations. It can be considered a semi-roof replacement as the original roof frame and foundations will likely remain in place. 

This provides an interior-like finish which makes a conservatory feel more like an extension or orangery.

This is usually the more expensive option but energy efficiency can be better than uPVC-covered insulation. It also gives you the option to paint the ceiling and style it with interior fittings. 

If done properly, an insulated conservatory with a plastered interior can look high-end whilst still costing considerably less than an orangery conversion or extension. 

Pros of Plaster Conservatory Roof Insulation 

  • Provides the aesthetic of an interior space
  • Can be painted and fitted with interior lights
  • Superior energy efficiency
  • Soundproof and long-lasting

Cons of Plaster Conservatory Roof Insulation 

  • Usually more expensive than uPVC options

uPVC Conservatory Roof Insulation 

uPVC roof insulation is one of the cheaper options, but it still provides superb thermal performance. 

Your conservatory roof will be layered with internal insulation material and opaque uPVC sheets will be added over the top. The finished result is slick and professional, providing a highly insulated roof at a fraction of the cost of a full replacement. 

The finished design will look like a conservatory with an opaque permanent uPVC roof, somewhat resembling an orangery. 

Pros of uPVC Conservatory Roof Insulation 

  • Cost-effective
  • Excellent insulation 
  • Relatively lightweight and easy to install 
  • Durable and soundproof 

Cons of uPVC Conservatory Roof Insulation 

  • Limited design choices and colours 
  • uPVC does not last forever

Aluminum Conservatory Roof Insulation 

Aluminium panels can be placed over your existing roof. This is the quickest way of insulating a roof.

Insulated aluminium panels have excellent thermal efficiency and can be easily fitted over most existing roofs. 

Whilst simply laying panels over your roof might seem like the ‘quick and dirty’ way to insulate your conservatory, the interior could still be plastered if you want, providing a high-end overall look. 

Pros of Aluminium Conservatory Roof Insulation

  • Easy to install 
  • Cost-effective 
  • Superb thermal efficiency 
  • Long-lasting 
  • Can be combined with interior plastering 

Cons of Aluminum Conservatory Roof Insulation 

  • Maybe less sightly than other options 
  • Practicality over style 

How Do I Choose?

At a glance, the options here may be somewhat confusing.

Your conservatory fitter should have a portfolio of work that includes examples of the various options – this will help you choose. 

Your options depend on your conservatory style and size. For example, aluminium or uPVC panels might be premade for an array of standard-sized conservatories, making fitting insulated roofs for some conservatories a breeze. 

Moreover, lean-to conservatories or other rectangular or square conservatories may be cheaper and easier to plaster internally. 

What is Conservatory Insulation?

You might be considering knocking your conservatory down and creating a new extension, or converting it into a more energy-efficient orangery. 

But there is another solution that is both cheap and energy-efficient – installing conservatory roof insulation. 

The main source of heat loss or excessive heating is the conservatory roof. The roof refracts, magnifies and intensifies sunlight in the summer, but in winter, it allows rising heat to escape easily. Glare from intense sunlight can also make the use of televisions or computer monitors unusable in conservatories. 

Typical PVC or glass conservatory roofs have a U-rating of some 1.7. This means they conduct heat in the summer and lose heat in the winter. 

Even an A-rated window has a U-rating of some 1.5 to 1.6, which is very high – high is bad when it comes to a U-rating. 

The solution to a conservatory’s poor thermal efficiency? Insulate the roof. Since heat rises, most is lost through the roof. In summer, the sun’s vertical position in the sky means it enters straight through the roof, less so the side windows. 

Does Adding Conservatory Roof Insulation Mean Replacing the Roof?

Not necessarily, or at least, not entirely. Conservatory roof insulation is generally fitted internally but external panels are usually fitted to cover the glass and provide additional protection and insulation. 

The insulation is layered under the existing conservatory roof. uPVC or plasterboard sheets are then fitted internally in your conservatory, under the new insulation.

This covers the insulation – your conservatory will look more like an interior space after (but the large open aspect windows will be retained).  

In the case of plaster conservatory roof insulation, the insulation will be plastered over internally. 

Plastering the new interior ceiling is the more costly option, but it looks very stylish, essentially providing an orangery-style conversion for a fraction of the cost. 

Does Conservatory Roof Insulation Look Good?

Many might assume that internal conservatory roof insulation will look like a ‘bodge job’, but this isn’t the case. If done properly, internal conservatory roof insulation will make your conservatory resemble an orangery or more permanent extension.

It can actually improve the overall aesthetics of the conservatory, adding value to your home in the process.  

Whilst internal conservatory roof insulation is still not as comprehensive as replacing the whole roof, it is a much cheaper, quicker and easier option that still yields comparative results. 

The Benefits of Conservatory Roof Insulation

  • Cut energy bills dramatically by boosting thermal efficiency 
  • Transform the conservatory into a more flexible indoor space
  • Avoid issues with overheating during summer
  • Protect plants, electronics and furnishings from big temperature swings
  • Improve sound insulation from wind, rain and ambient noise
  • Reduce glare to create a better working environment 
  • Cheaper than fully replacing the roof with slate or other heavy permanent roofing material 
  • Only takes a couple of weeks
  • Far, far cheaper than an extension or orangery conversion 
  • Adds value to the home

How Long Will Installing Conservatory Roof Insulation Take?

It depends on your conservatory and choices but it’d be rare for the installation to take longer than a couple of weeks. 

Plastering may add a few days to the total job duration. Installing insulated aluminium panels on a small conservatory should only take a couple of days. 

New Conservatory Roofs and Planning Permission 

So long as your newly insulated conservatory roof is roughly the same height as the previous one and is built using materials stylistically in-keeping with your home and conservatory, it’s highly unlikely that planning permission will be an issue. 

Ask your conservatory fitter for advice regarding planning permission if you are concerned. 

Also, since your conservatory should have been building regulation approved when it was initially built, there should be no issues here either.

If additional building regulation approval is needed then ask your contractor if they’re part of the Competent Person’s Scheme, if so then you will not need to worry about this as they can self-certify the work.

When searching for a conservatory specialist or contractor, check for membership/accreditation to the following: 

Get Prices on Conservatory Roof Insulation Near You

We’ve done our best to give you a good idea of what you can expect to pay for conservatory roof insulation.

However, our guides are not a substitute for a fixed quote specifically for you.

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About the Author

Alex Johnson is a qualified quantity surveyor and writer with a passion for conducting original research and uncovering the true cost of jobs. His cost data has been referenced by EDF Energy and the Scottish Government.