Glass roof or insulated roof panels?

These two roofs solve different problems, so the right choice depends on what is wrong with your conservatory now. If the room is dim, dated or leaking but you love sitting under the sky, a new glass roof keeps that and fixes much of the glare. If the room is unbearable in July and freezing in January, and the roof light is the cause rather than the attraction, insulated panels deal with it for less money.

Both keep the conservatory’s shape. The glass option usually means a new roof frame; the panel option slots into the existing bars.

Glass roof vs insulated panels at a glance

	Glass roof	Insulated roof panels
Price, medium conservatory (about 4m x 3.5m), fitted	£3,500 to £7,000 (typically about £5,200)	£1,800 to £4,600 (typically about £3,100)
Heat lost (U-value, W/m²K)	1.0 to 1.2 for performance glass	0.29 to 0.5 (0.29 is the makers’ centre-of-panel figure; the old bars add to it)
Sun’s heat let in through the roof	18% to 70%, depending on glass grade and tint	None
Time on site	2 to 4 days	1 to 3 days
Building regulations	Usually exempt when like for like	Depends on the system; LABC’s view is that approval is likely needed
Lifespan	25 years plus	15 to 25 years
Daylight through the roof	The most of any roof	None: the roof becomes opaque
Rain noise	Moderate: quieter than polycarbonate, louder than tiled	Much quieter than polycarbonate

Prices are our site-wide ranges for a medium conservatory (about 4m x 3.5m) across lean-to, Edwardian, Victorian and gable shapes, fitted; installers usually quote including VAT, but check. Glass figures are Ultraframe’s published data for its performance glass; panel figures are makers’ claims.

Which is warmer in winter?

Insulated panels lose much less heat through the roof. Makers such as Thermotec and Superior Conservatory Panels quote 0.29 W/m²K for their panels, against 1.0 for the best performance glass and 1.2 for standard performance glass. On paper that is three to four times better.

Two caveats. First, the panel figure is measured at the centre of the panel. A rival solid roof installer points out that heat is still lost through the existing bars and ridge, so the whole roof will perform worse than 0.29. Second, the roof is only one part of the room: side windows, dwarf walls and the floor still lose heat, so the difference you feel will be smaller than the U-values suggest. Our page on a cold conservatory covers the other causes.

Which stays cooler in summer?

Panels, because they let no sun through the roof at all. Which? warns that the more glass in the roof, the greater the chance of overheating, and says south-facing conservatories without shade are the most prone. Difficulty regulating temperature was the top regret among Which? members surveyed in April 2026, at 24%.

Glass has improved, though. Ultraframe’s performance glass ranges from 70% of the sun’s heat let through for its clearest grade down to 18% for its best tinted solar control grade. Ultraframe advises high solar rejection glass for south and west facing rooms and clearer glass for north and east facing ones. Orientation matters as much as the glass: Which? says north-facing conservatories are less likely to overheat than unshaded south-facing ones. See our guide to solar control glass.

How much light will you lose with panels?

All of the light that comes through the roof. The side windows and doors still let light in, but the room will be noticeably darker. Homeowners who swapped to solid roofs warned on MoneySavingExpert that rooms borrowing light through the conservatory, such as a kitchen or lounge, can become much darker. A glass roof keeps the room as bright as it can be, and it is the reason most conservatories have glass roofs in the first place. If glare rather than heat is your complaint, our page on conservatory glare may be all you need.

Which is quieter in the rain?

Panels. No independent decibel tests were found, but panel customers have been quoted saying they no longer need ear defenders when it rains, which says as much about the polycarbonate they replaced as about the panels. Glass is quieter than polycarbonate but louder than a solid roof, according to ExpertSure.

Cost and value for money

On our figures a glass roof typically costs about £5,200 for a medium conservatory and panels about £3,100. Structural work is part of the difference. Glass is far heavier than polycarbonate, and installers such as Vivaldi say replacing a polycarbonate roof with glass mostly needs “an entirely new roof, designed specifically for glass”. Panels fit into the existing roof bars, and one maker says a typical installation takes a single day.

Think about what you keep. A new glass roof gives you new bars, seals and flashings. Panels keep the old frame, ridge and gutters, and one critic says panel guarantees often cover the panels only. On the other side of the ledger, glass carries its own long-term cost: ExpertSure puts a failed sealed unit at £300 to £600 per panel to replace, and 10% of Which? members said their glass was hard to keep clean. See glass roof costs and insulated panel costs.

Building regulations and paperwork

A glass roof replacing a glass or polycarbonate roof is usually exempt from building regulations, provided the conservatory still qualifies afterwards: ground level, no more than 30m², safety glazing where needed, separated from the house by external doors or windows, and not heated by the house’s central heating.

Panels are less clear-cut. Some sellers say no approval is needed, but LABC’s guidance says work that “significantly reduces the proportion of glazing, or level of translucence to the roof” ends the conservatory exemption, and it names products that underdraw or overclad polycarbonate roofs. An opaque panel roof falls squarely into that. No published ruling covers panels specifically, so ask your council’s building control before you sign and get the installer’s answer in writing. Our building regulations guide explains the routes.

Energy ratings treat the two differently as well. A glass roof keeps the conservatory a conservatory. A conservatory whose replaced roof is less than 75% glazed is recorded as an extension under the assessment rules in force since August 2026, so keep the panel specification if you go that way.

Looks and resale

A glass roof keeps the look most people expect of a conservatory and lets you see the sky from inside. A panel roof keeps the conservatory’s outline but reads as solid from the garden, and inside you see panels between the existing bars rather than glass or a plastered ceiling. No independent figures show what either adds to a sale price. What matters on a sale is paperwork: a glass roof on an exempt conservatory needs none, while a panel roof fitted without approval may prompt questions from a buyer’s solicitor if building control would have expected an application.

Glass roof or insulated panels: which should you choose?

• The conservatory faces north or east and you use it by day: glass, with a clearer, high light transmission grade.
• It faces south or west, overheats and you rarely look up: panels, or a full tiled roof if the budget allows.
• A kitchen or living room behind the conservatory relies on its light: glass.
• The existing roof frame is sound and the budget is under about £3,500: panels, from a firm that confirms the building control position in writing.
• The roof frame is tired, leaking at the ridge or sagging: glass on a new frame, or a solid roof, rather than panels in old bars.
• You want to sell soon with the least paperwork: glass.

When you get quotes, ask glass installers for the glass’s U-value and solar figure and whether the price is for a new roof frame, and ask panel installers for the whole-roof U-value and how the job will be signed off.