Local Shutter InstallersQuestions · Cost
How much heat does a shutter block?
Updated
A solid external roller, fully down, is commonly described as stopping on the order of 80 to 90 percent of the solar radiation that would have come through the glass. The exact figure depends on the product test and the glass.
The number
An internal blind sits behind the pane, so it does not get the same reduction. Close the shutter before the sun is on the glass.
Fitted illustration for How much heat does a shutter block? in Cambridge: £1,823 at September 2026 prices, for this 1.2 by 2.1 m opening with a belt. The figure allows a front-mounted aluminium curtain and ordinary fixing. It does not include scaffold, a rebuilt soffit, planning drawings, or a new window. A second opening on the same visit usually costs less than the first, because the van is already there. Compare two quotes only when the slat, the box and the drive match.
- belt on a 1.2 by 2.1 m opening
- Colour as a RAL or foil reference, not a dusk photo
- Scaffold, electrics and making good listed or excluded
- Lanterns and side lights named or left out
What the watts are doing
The worked opening for How much heat does a shutter block? is 1.2 m wide by 2.1 m high, 2.52 square metres of glass. This figure puts 545 watts per square metre on the pane and uses a g-value of 0.63, about 865 watts into the room if the curtain is up. An opaque external shutter, taken as stopping 80 percent of that gain while it is fully down, leaves about 173 watts and keeps about 692 watts out. That is a noon figure for comparison. An internal blind does not get the same reduction. For How much heat does a shutter block?, use the noon figure to compare two openings on the same house, then let a measured survey replace the figure.
Night-time, priced as comfort
Winter figure for How much heat does a shutter block?: glass at 1.2 W/m2K, 2.52 square metres, a 12 degree inside-outside gap and eight night hours. The bare pane is about 0.29 kWh a night on that crude sum. A closed shutter cutting about 18 percent of the flow leaves 0.24 kWh and saves about 0.05 kWh a night, only while it is down. Open it when you want winter sun.
Lines that should be extra
Stop How much heat does a shutter block? if the door is an escape route and the motor has no way to open when it is dead. A photograph is not a manufacturing size.
How to use the figure
The 1.2 by 2.1 metre opening inside How much heat does a shutter block? is there so a quote has something to disagree with. If the tape gives a different size, the tape wins.
The example drive is a belt, and the illustration is £1,823. A belt, a wired motor and a solar motor can share a curtain and still be different jobs. Compare those lines, not a single bold total.
What the survey still has to write down
For How much heat does a shutter block?, ask where the box lands, what colour reference will be ordered, and how the curtain opens when the motor is dead. Those three answers move the job more than a rounded price.
Leave the lantern, the side light and the next elevation off the order unless they are drawn. How much heat does a shutter block? covers one kind of opening. The house may have three.
When I would not order yet
How much heat does a shutter block? should wait if the opening is an escape door with no way to raise a dead motor, or if the front is the elevation a conservation area was drawn to protect.
A photograph is not a manufacturing size. Two quotes for How much heat does a shutter block? only compare when the slat, the box and the drive are the same kind of thing.
Questions worth asking the fitter
Is the price on this page a quote?
No. £1,823 illustrates How much heat does a shutter block? for a 1.2 by 2.1 metre opening with a belt, at September 2026 rates. Your survey replaces it.
Does the shutter cover every pane?
It covers the opening it is built for. Here that example is 2.52 square metres. A roof lantern, a side light or the next elevation is another line.
What if planning is unclear?
Do not pay the factory for How much heat does a shutter block? until a listed building, a conservation front, a flat or a shopfront has a written answer. Ordinary rear walls on houses are sometimes simpler.
What should two quotes share?
The same openings, the same slat type, and the same drive. How much heat does a shutter block? uses a belt in the example so you can see how much the motor choice moves £1,823.