Blinds or insulation
Roof blinds or insulation: which works better in a conservatory?
The short answer
They solve different problems. Roof blinds cut the sun's heat and glare in summer, so they suit a room that overheats. Insulation slows the loss of warmth in winter, so it suits a room too cold to sit in. If both are the complaint, blinds alone will not fix the winter and insulation alone will not fix the summer, and a solid insulated roof with good ventilation addresses both together.
What roof blinds and roof insulation each do, where each one fails, and how to decide between them for a conservatory that is too hot, too cold or both.
What blinds do and what they cannot
A roof blind sits under the glazing and shades the room from the sun. It reduces glare, makes the room more comfortable to sit in and protects furniture and floors from fading. It is also easy to fit and can be taken down. For a room that is merely too bright, a blind may be all you need.
The limit is where the blind sits. Sunlight has already passed through the glass by the time it reaches an internal blind, so the heat is inside the room and the blind soaks it up and warms the air around it. Blinds fitted outside the glass do better because they stop the sun before it enters. In winter a blind does little. A thin fabric layer under a glass roof offers a little resistance to heat loss, but it is not insulation, and it does not stop cold glass sending cold down into the room. If your complaint is a freezing room, blinds are the wrong tool.
What insulation does and what it cannot
Insulation slows the movement of heat through the roof. In winter it keeps the warmth you pay for inside the room, and in summer it slows the heat coming in through the roof. It is a build-up in layers: rigid boards or mineral wool, a vapour control layer, a lining on the inside and a weatherproof covering on the outside. It only works in a roof that has a place to put it, which means a solid roof or a retrofit panel system. You cannot insulate a pane of glass with a blanket and expect much.
Insulation does nothing for glare, and a room with a solid insulated roof can feel darker than one with glass. Without ventilation it can also trap moisture and heat. Spraying foam onto a leaking roof is something the Energy Saving Trust advises against, and the same sense applies to any insulation: a damaged roof is repaired first. Our guide to conservatory roof insulation looks at the choices.
Matching the fix to the complaint
Match the cure to the symptom. A room that is bearable in winter but unbearable from May to September points to solar gain, and the first step is shading: external or internal blinds, solar-control glazing, or opening vents to let hot air out. A room that is fine in summer but too cold from October points to heat loss, and the answer is insulation, either a new solid roof or an upgrade to the existing one.
A room that suffers at both ends of the year is the strongest case for a solid insulated roof with opening windows. It moderates the extremes, because the roof holds winter warmth and slows summer heat. Even then, the glazed walls matter. They stay as they were, so some glare and some heat loss remain. If you want to know what is realistic for your room, read our page on why a conservatory gets too hot and tell us how the room is used. The full range of roof options is on our conservatory roof replacement page.
When a solid roof is the better answer
For a room you want to use all year, a solid roof usually does more than any blind. Tiled and insulated roofs add a thermal layer that glass cannot match, and they make the room feel like part of the house. A lantern or roof windows can keep some daylight. The trade-off is that the room is less bright, the work is bigger, and the foundations, frame and wall plate have to take the added load.
A solid roof also brings consent. Under Planning Portal guidance a new conservatory roof has to satisfy Building Regulations on structure, energy use and ventilation. That means an application to building control, inspections as the work goes on, and a sign-off at the end. We explain what is needed at the survey. Our solid and tiled conservatory roofs guide sets out the full conversion.
Trying the cheaper steps first
Before committing to a new roof, try the small steps. Add solar-control film or an external blind on the sunniest side. Fit or service trickle vents and an opening roof vent so hot air can escape. Check that the seals on the glazing bars and the door are sound, because draughts waste heat quickly. Thermal-lined blinds at the glazed walls and a rug on the floor make a noticeable difference to winter comfort.
If those steps do not give you a room you can use, the roof is worth a closer look. We survey the existing roof, photograph the frame and tell you plainly whether blinds, insulation, a refurbished roof or a new solid one is the right job. The written quote gives a single total. Our advice is the smallest job that cures the fault, and sometimes that is a blind and a vent, not a new roof.
Related questions
Blinds and insulation
Do conservatory roof blinds reduce heat loss in winter?
Only slightly. A blind is a thin layer under the glass, so it cannot stop heat leaving through the roof the way insulation does. Thermal blinds help a little at night, but they are not a substitute for a better roof.
Can I insulate a glass conservatory roof without replacing it?
Some retrofit systems fit insulated panels inside an existing frame, and they follow the same consent rules where the roof changes. The frame must be sound and strong enough, and a survey checks both before any price is given.