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The Complete Guide to Conservatory Insulation

The average conservatory roof replacement costs £2,250-£7,000

The government's ECO scheme may help you pay for some of the costs

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When most people consider adding a conservatory to their home, they picture a bright, airy room, soaked in golden sunlight. And, with a bit of added space, perhaps they can expect the value of their house to jump up a notch.

Unfortunately, when building their dream extension, a lot of Brits brush over the insulation – and are usually left facing the harsh reality of a sweltering sauna in the summer, and an ice-cold box in the winter.  

But this can easily be fixed – and we’re here to show you how. By adding an extra layer of insulation to your conservatory, homeowners can fix these extreme temperatures, whilst also saving on energy bills. 

To find out how much spray foam insulation will cost you, simply pop your details into this quick form, and our suppliers will be in touch.

The inside of a conservatory with insulating panels

What is conservatory roof insulation?


You may remember, many moons ago, when your science teacher explained that heat rises – which means that a huge amount of heat in your home escapes through the roof. So, like the rest of your home, your conservatory roof needs an extra layer of insulation to make sure the heat is locked in. 

Traditional conservatories – usually made of glass – were certainly not built for energy efficiency. As a quick fix, some people simply install a foil ‘quilt’ that attaches to battens, and is then covered over with plasterboard. You can also pop some draught excluders on any encroaching breezes, place some rugs on the floor, and add blinds/curtains to your windows. 

But we’re not a fan of quick fixes – they are more affordable, but will most likely lack efficiency and not last a great deal of time, consequently costing you more in the long run. 

So, what are your other options?


Replace the roof

Replacing a conservatory roof used to be much more long-winded than it is today. Thankfully, in 2010, UK planning laws were relaxed – now, in the majority of cases, you can fit a solid roof to your conservatory without needing planning permission.

Depending on the type of material you go for, you may be able to seal in more heat during colder months: 

  • Tiled roof Although a tiled roof will usually cost more than a glass alternative, and will take a few days to install, it tends to act as a better insulator of heat and a barrier against noise. Admittedly, you will lose quite a bit of sunlight with a tiled roof, but skylights or roof lights can fix this
  • Double/triple glazed roof The main benefits of using glass panes in your roof are that this lets maximum sunlight through, and also has great insulation properties against both heat loss and noise. As with the sides/windows, you can choose to use a treated type of glazing to help with temperature control and noise reduction

Although roof replacement is a great option, you will need Building Regulatory Approval (different to Planning Permission), which basically makes sure that the extension meets certain safety standards. This will also mean that your conservatory classification will change from a ‘temporary structure’ to a ‘permanent’ one.


Conservatory roof insulation panels 

A lot of people go for insulation panels as an alternative to roof replacement. It’s cheaper, much faster to install, and you’ll still reap the rewards of a well-insulated home.

These practical panels win Brits over for a handful of reasons:

  • They’re lightweight 
  • Most have u-values of around 0.29, compared to single glazing’s u-value of 4.8 (u-values are the rate of transfer of heat through a structure – the lower the number, the more efficient it is) 
  • Panels can usually be fitted within a day
  • Most panels come with a ten-year guarantee
  • They’re compatible with all types of conservatory

Do I need to insulate my windows?


When it comes to conservatory insulation, it’s best to cover all bases – including your windows. If you have single glazed windows, you’ll notice a huge difference in temperature throughout the year by upgrading to double glazing

Check out our top tips on window insulation below:

  • Replace windows with double glazing – Double glazing works by adding a layer of insulating gas, such as argon, in between two panes of glass. This gas will act like a blanket around your conservatory, and seal in your home’s warmth
  • Look into thermal-coated windows – As soon as it is applied, thermal coating blocks 100% of UV rays and minimizes the infrared's penetration. This prevents heat accumulation, and thereby reduces energy bills. It also allows you to control your conservatory’s heat loss in the winter, thanks to the thermal barrier created
  • Add curtains/blinds – Not only will this add an extra layer of insulation to lock in heat during the winter, but it’ll also shield you from the sun’s gleaming rays in the summer
  • Explore different material frame options – Typically, you’ll find that materials such as wood and uPVC are more insulating than aluminium frames 

Conservatory insulation cost


If you go for one of the short-term solutions, you’ll be paying less – but you also won’t benefit from significant cuts to your energy bills.

The long-term changes, on the other hand, will make a huge difference in how your conservatory retains heat in the winter – but it’ll cost you. 

Either way, insulating your conservatory will help you save money, which is becoming more important in the wake of rising energy bills.

The Eco Experts' National Home Energy Survey made this clear, finding that 60% of Brits wanted to go greener to help cut down on energy bills.

For a spray foam insulation quote tailored you, simply fill in this quick form, and our suppliers will get back to you.


Conservatory roof replacement costs

The average conservatory roof replacement costs £2,250-£7,000 – this will all depend on the type and size of conservatory you have, as well as the material you go for. 

As a guide, we’ve outlined the different prices for conservatory roof replacement below:

Type of conservatory roof
Roof material
Average price
Lean-to conservatory
(3000mm x 3500mm)
£2,355 – £2,705
Lean-to conservatory
(3000mm x 3500mm)
£2,610 – £3,175
Victorian conservatory
(4000mm x 4000mm)
£4,345 – £5,005
Victorian conservatory
(4000mm x 4000mm)
£4,740 – £5,345
Edwardian conservatory
(4000mm x 4000mm)
£4,480 – £5,120
Edwardian conservatory
(4000mm x 4000mm)
£4,875 – £5,570

Conservatory insulation panel costs


Depending on the type, size, and composition of your conservatory, the price of insulation panels tends to fluctuate a lot. As a basis, you can expect prices to start at approximately £2,500 – but you would have to get a quote for a more accurate estimate. 


Double glazing window costs

Similar to the other insulation options above, different types of window frames will alter the price vastly. 

Here’s how much a single 100cm x 100cm double glazed window will cost you on average with different types of frame, to give you an idea of what to expect.

Type of frame

Prices have been sourced from various websites, including Double Glazing on the Web, Local Glazing Prices, and Get a Window.

Inside a conservatory with insulation

Conservatory insulation grants


No matter how much we praise conservatory roof insulation for its impact on energy bills, some people simply can’t justify putting aside a few hundred pounds for the initial costs.

If this sounds familiar, fear not – there’s still a way for you to benefit from this handy home insulation.

The government offer a grant to help homeowners increase their household energy efficiency: the Energy Company Obligation scheme. 


The Energy Company Obligation (ECO) 

This government scheme means that certain energy and installation suppliers are required to support low-income, fuel-poor, and vulnerable households to heat their homes. Whether it’s to insulate your walls, or replace your boiler with a new eco-friendly one, the ECO scheme will lend a hand. 

However, not all UK residents will be eligible for this scheme. To reap the benefits of ECO, you must be a core group customer from scheme year 9 onwards under the Warm Home Discount Scheme, or receive at least one of the following benefits:

  • Armed Forces Independence Payment
  • Attendance Allowance
  • Carer's Allowance
  • Child Benefit (on the condition that the household’s relevant income does not exceed the amount set out in Chapter 3 of the government scheme guidance)
  • Constant Attendance Allowance
  • Disability Living Allowance
  • Pension Guarantee Credit
  • Income-related Employment and Support Allowance (ESA)
  • Income-based Jobseeker's Allowance (JSA)
  • Income Support
  • Industrial Injuries Disablement Benefit
  • Mobility Supplement
  • Personal Independence Payment
  • Severe Disablement Allowance
  • Tax Credits (Child Tax Credits and Working Tax Credits)
  • Universal Credit


Green Homes Grant 

This grant was unfortunately cancelled in March 2021, a year before its intended end date.

It was meant to provide 600,000 homeowners with £5,000 vouchers to go towards energy-efficient home improvements, including insulation.

But the government didn't get close to this target, falling short by a massive 93.5%.

Next steps 


Once you’ve sussed out which insulation method works best for you, you can crack on with it. Since prices fluctuate so drastically, you’ll want to make sure to shop around for the best deal available. Soon enough, you’ll be on your way to a cosier, more efficient home. 

Wondering how much spray foam insulation will cost you? Simply enter your details into this short form, and our suppliers will contact you.

Beth Howell Writer

Beth has a real passion for green living. She’s been absorbed in eco research for over three years, and has become quite the expert. Whether you’re after a new set of solar panels, a home energy improvement, or you want to catch the latest eco news, she’s got your back.

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