Most conservatory roof enquiries begin with the same complaint: the room is unusable in July and unusable in January. The original roof was specified to be cheap and light rather than to hold a temperature, and the three ways out cost very different amounts because they are three different pieces of work rather than three grades of the same one.
The three replacements, and what each is really buying
A modern solar control glass unit keeps the daylight and cuts the summer heat, and it is the smallest change to the structure. An insulated solid roof turns the space into a room and changes it from a conservatory into something closer to an extension, with a plastered ceiling and downlights. A like for like polycarbonate sheet is the cheapest and leaves the room seasonal. The prices sit in that order and so does the disruption, and the middle option is the one most people mean when they ask about replacement.
What the existing frame will carry
A conservatory frame and its base were designed for the weight of the roof they came with. A solid roof is several times heavier than polycarbonate, so the first question any competent installer asks is whether the existing structure takes it, and sometimes the answer is that it needs reinforcing first or that it does not. That survey is not an upsell, it is the reason a solid roof on the wrong frame cracks the plaster and drops the doors out of square within a year.
The rule change that hides in the price
A conservatory is normally exempt from the Building Regulations partly because its roof is substantially translucent and it is separated from the house by external quality doors. Replacing that roof with a solid one is exactly the change that can remove the exemption, which brings thermal, structural and sometimes ventilation requirements with it. Settle that question before ordering, because retrofitting compliance to a finished ceiling is the expensive way to find out.
Questions people ask about conservatory roof replacement cost
Can any conservatory take a solid roof?
No. It depends on the frame, the base and the span, and reputable installers survey the existing structure and will sometimes reinforce it or decline the job. A refusal is a better answer than a roof the frame cannot hold.
Does a replacement conservatory roof need building regulations approval?
It often does. The exemption a conservatory enjoys rests partly on the roof being largely translucent, so replacing it with a solid one is commonly the change that brings the room inside the regulations.
Will a new roof stop the conservatory being cold?
Only partly, if the walls and doors stay as they are. A solid roof over single glazed side frames moves the cold spot rather than removing it, which is why the roof, the glazing and the heating are one decision.