Can You Replace a Conservatory Roof? What the Job Involves, Start to Finish
Updated: Oct 9
Your conservatory is too cold in winter, too hot in summer and loud every time it rains, and the roof is the reason. The good news is that you can usually replace just the roof and keep the rest of the room. Here is which conservatories it works on, how the job is done, how long it takes and what Building Control needs to see, from a team that replaces conservatory roofs across Berkshire every week.
Can you replace a conservatory roof?
Yes, in most cases. You can replace an old glass or polycarbonate conservatory roof with a new glazed roof or an insulated solid roof, while keeping the existing frame, base, windows and doors. The main condition is that the structure underneath is sound enough to carry the new roof, which a survey will confirm before any work is agreed.
Most people switch to a solid warm roof, because that is what fixes the temperature and the noise. Our conservatory roof replacement uses a warm roof system from Warmer Room, a UK manufacturer: insulated panels, a lightweight tiled finish outside and a plastered ceiling inside.
Which conservatories can have a new roof?
Roof replacements are common on most styles, including:
Lean-to conservatories
Victorian and Edwardian conservatories
Gable-fronted conservatories
P-shaped and combination layouts
Older polycarbonate roofs that have yellowed, leaked or sagged
The shape matters less than the structure. A solid roof is heavier than polycarbonate, so the frames and dwarf walls need to be in good condition. If they are not, they may need strengthening first, or the conservatory may be better replaced altogether.
How to replace a conservatory roof: step by step
This is how the job runs with a modern warm roof system.
1. Survey and checks
We measure the conservatory and check the condition of the frames, the base and the dwarf walls. We also look at access for materials and scaffolding, and whether any reinforcement is needed for a solid roof. This is also when you choose the finish: tile style and colour outside, and the ceiling and lighting inside.
2. Design and ordering
Once the measurements are confirmed, the roof is designed to fit your conservatory and made up as a kit. Because the parts arrive ready to assemble, the time spent on site is far shorter.
3. Removing the old roof
The old glass or polycarbonate panels and roof bars come off. This is the noisiest stage, but it is quick. We protect the room as we go, though it helps if you clear it beforehand.
4. Fitting the new roof structure
The new roof frame and insulated panels go onto the existing conservatory. Any strengthening the survey identified is done at this stage.
5. Weatherproofing and tiles
With the structure in place, the roof is made watertight and the outer covering goes on, such as lightweight tiles or slates. Guttering and trims are finished to suit the conservatory and the house.
6. Ceiling and finishing
Inside, the old roof bars and panels are replaced by a plastered ceiling that can be decorated like any other room. Many homeowners add spotlights at this stage.
7. Final checks and handover
We check the finish, the seals and the drainage, and hand over the paperwork for the system. That includes the 25-year guarantee on the roof structure.
How long does a conservatory roof replacement take?
Most warm roof replacements we fit are completed within around a working week. A small lean-to can be quicker. A large or complex roof, or one where the frame needs strengthening first, can take longer.
A like-for-like swap from one polycarbonate roof to another is usually faster still, because there is no insulation or ceiling to fit. Weather can also push the dates back, since the old roof has to come off on a dry day.
Do you need Building Regulations to replace a conservatory roof?
If you are swapping a glass or polycarbonate roof for a solid one, yes. LABC confirms a solid roof replacement needs a Building Regulations application. The inspector will check that the new roof and the structure supporting it comply with the regulations, and that the rest of the conservatory is no worse than before.
Replacing a translucent roof with another translucent roof is a different case, because it does not change how the conservatory performs. Either way, ask about Building Regulations at the quote stage, so the paperwork is in place when you come to sell.
Getting ready for the work
A few small steps make the job go smoothly:
Clear furniture and valuables out of the conservatory
Protect the flooring along the route the team will walk through
Expect some noise on the day the old roof comes off
If the conservatory is a main route to the garden, plan another way through
Timing helps too. Many homeowners book in late summer or autumn, so the room is ready to use before the cold sets in.
Is it better to replace the roof or the whole conservatory?
If the frame and base are sound, replacing the roof is usually the better first step. It fixes the comfort problem without the cost and disruption of a rebuild. We compare all the options, from a refresh to full removal, in our guide to replacing an old conservatory.
If the structure is failing, or you want a room that opens fully into the house, a new roof will not get you there. In that case it makes more sense to replace the conservatory with a timber frame extension built to the same standard as the rest of the home.
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