Your handy guide to conservatory roof replacement costs

It might surprise you to learn that conservatory roof replacement costs may well not come to any more than it would to repair your existing conservatory roof – yet the results can be transformative.

All too often conservatory roof replacement is overlooked as many homeowners either choose to replace the entire structure, either with a new conservatory or an extension, or to repair their existing roof.

"Replacing your conservatory roof is an excellent way to breathe new life into your home, and is far more cost-effective than replacing the whole conservatory," says managing director of Roofing Megastore Gian-Carlo Grossi.

Here, we look at what it is likely to cost you if conservatory roof replacement is a project you are considering.

How do materials affect conservatory roof replacement costs?

Just as when it comes to conservatory costs, the amount your conservatory roof will cost to replace will largely depend on the materials you are choosing to use for the new roof, as well as its size and shape. 

"There are three options to choose from," advises Gian-Carlo. "Glass, polycarbonate or tiled. They each provide different levels of durability, insulation and security. They also have varying installation and maintenance costs."

Polycarbonate roofs are the cheapest option and are still a great choice, meaning many people choose this material to replace an old glass roof. They have a typical lifespan of 10 years. 

They are lightweight and easy to install but not as durable as glass or tiled roofs. In some cases they can also let in some outside noise, such as heavy rain.

Glass roofs are next on the price scale, although the type of glass you choose will affect how much you pay.

"Those who would like to replace their existing glass panels with new glass should consider the different variants available," says Gian Carlo. "In particular you should consider double glazed panels with an argon filling, which is shown to prevent heat escaping during cooler months. This also helps to keep cold air out.

"You may also benefit from considering self-cleaning glass panels. These feature an outer coating which reacts to environmental changes to break down dirt. If glare is an issue during summer, you’ll find tinted glass panels too. A glass conservatory roof will likely last in excess of 30 years."

Finally, tiled conservatory roofs are the most expensive option  – although they are very attractive and really help minimise heat loss. The tiles you choose will play a major role in the final costs – with concrete being the cheapest option.

"If you are replacing the roof with a solid roof you will need to be able to prove you had Building Regulation Approval when it comes to selling your home," points out Alex Hewitt, marketing director at Ultraframe. "If you choose a tiled roof you can still include glazing to ensure an interior that is light and bright. For example, the Ultraroof from Ultraframe can be glazed with full length glazing panels to flood the new room below with natural light.

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Replacing an old, inefficient glass conservatory roof is a popular project with those keen to enjoy their glazed space all year round

The Ultraroof from Ultraframe, seen here, an be glazed with full length glazing panels so plenty of light can still flow in

What does a new polycarbonate conservatory roof cost?

First up, what will a replacement polycarbonate conservatory roof cost you?

"For a 3m x 3m polycarbonate roof expect to pay £2,500 to £3,500," say the experts at The Home Improvement Hub. "For example, if you have a lean-to conservatory that is roughly 3m x 3m you would be looking to pay between £2,500 and £3,500 for a polycarbonate roof. However, for a Victorian style conservatory which measures 4m x 4m expect to pay £3,500 to £4,800." 

According to Checkatrade, you can expect to pay between £3,500 to £4,200 for a simple polycarbonate roof for lean-to conservatory ideas, right up to £8,100 to £12,150 for an Edwardian design measuring 4.5m x 4.5m.

How much does glass conservatory roof replacement cost?

Replacement glass conservatory roofs are incredibly popular both with those with existing damaged or thermally inefficient glass roofs as well as those looking to upgrade a polycarbonate roof that has seen better days. But what should you expect to pay?

According to Checkatrade, a new glass conservatory roof could start from approximately £6,300 for a lean-to conservatory (sized 3m x 3mm). They go on to advise that for an average size of 4m x 4m conservatory, the average cost is approximately £14,400.

The Home Improvement Hub suggest you should expect average costs of between £4,200 to £5,400 for a conservatory of 3.5m x 3.5m. 

While there is a considerable difference between these estimates, bear in mind that there is a huge variation in glass types and, of course, the size and shape of your roof – your conservatory ideas will also have an effect on what you eventually pay.

What will a tiled conservatory roof cost?

And, finally, what will a replacement tiled conservatory roof set you back?

This is most certainly the most expensive of all the options. The Home Improvement Hub say, on average, for a 3.5m x 3.5m structure, average costs come in at between
£6,500 and £9,000. 

Checkatrade suggest costs could be closer to between £16,000, right up to around £30,000 for larger roofs.

While these costs are obviously considerably more than polycarbonate or glass, there are benefits to consider when weighing up the options and this may be something those thinking about insulating a conservatory roof might like to consider. 

"The overall build-up of a tiled conservatory roof provides superb insulation. With glazing bars not being required, there is also less chance of drafts and cold air seeping through small gaps," points out Gian-Carlo. "The only negative aspect of roof tiles is the cost and weight. A tiled conservatory roof will typically last in excess of 50 years with little maintenance being required."

When choosing a tiled replacement roof, be very wary of any companies offering 'cladover' solid roofs as a cheaper alternative.

"These types of roofs leave the existing roof in place and then add insulation to the inside and a tiled finish to the outside. While they may look better than the old conservatory aesthetically, they are an accident waiting to happen," says Alex Hewitt. "This is because they add a huge amount of extra weight to your conservatory roof that it was not designed for. This could leave it liable to movement and damp patches or it could even collapse under excess weight – especially when additional load is added such as snow which no longer melts as quickly on the roof."

Gian-Carlo Grossi

Gian-Carlo is founder and managing director of Roofing Megastore and holds a wealth of experience of working within the building materials industry. 

Can I install my own replacement conservatory roof?

If you are looking to make savings on the replacement of your conservatory roof, you may well have considered having a go at the job on a DIY basis – but is this wise?

"Don't attempt to transform your old conservatory roof yourself, either internally or externally," warns Alex Hewitt. "This is a job for the professionals as weight loads and ventilation need to be given careful consideration."

Alex Hewitt

Alex is marketing director at Ultraframe and is passionate about bringing new innovations to the conservatory market.

When replacing your conservatory roof, you might like to consider changing the design slightly – there is no need to stick the same shape or style you had before. Do be aware, however, that, depending on the new design, conservatory planning permission may be required. 

"Did you realise it’s possible, in most cases, to change the shape and style of your roof?" says Alex Hewitt. "For example, if your old conservatory is a Georgian style you may choose to change it to a gable or lean-to style. As long as your old conservatory has an angular base shape you have lots of options. If you have a Victorian style conservatory then you can still replace the roof as either tiled or hybrid. There is also the option of extending your base into an angular shape to open up other style possibilities."