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Do not buy one spec for two briefs
Updated
A shop security shutter punched full of holes is a poor blackout and a poor insulator. A slim thermal roller is a modest delay, not an LPS product.
What you are actually choosing
If you need both performances, say both, and expect a heavier domestic security curtain that is still properly sealed, or accept that one opening cannot be a shop door and a nursery.
A roller, a screen, a venetian and a plantation panel are four answers.
An illustration, not a winner
The worked opening for Do not buy one spec for two briefs is 4.2 m wide by 1.2 m high, 5.04 square metres of glass. This figure puts 620 watts per square metre on the pane and uses a g-value of 0.7, about 2187 watts into the room if the curtain is up. An opaque external shutter, taken as stopping 85 percent of that gain while it is fully down, leaves about 328 watts and keeps about 1859 watts out. That is a noon figure for comparison. An internal blind does not get the same reduction. For Do not buy one spec for two briefs, use the noon figure to compare two openings on the same house, then let a measured survey replace the figure.
Fitted illustration for Do not buy one spec for two briefs in Belfast: £4,042 at September 2026 prices, for this 4.2 by 1.2 m opening with a wired motor. 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.
Winter does not care about the brochure
Winter figure for Do not buy one spec for two briefs: glass at 1.4 W/m2K, 5.04 square metres, a 12 degree inside-outside gap and eight night hours. The bare pane is about 0.68 kWh a night on that crude sum. A closed shutter cutting about 24 percent of the flow leaves 0.51 kWh and saves about 0.16 kWh a night, only while it is down. Open it when you want winter sun.
A poor reason to mix them
Stop Do not buy one spec for two briefs if the frame cannot take a guide and the wall beside it is crumbling. A photograph is not a manufacturing size.
If Do not buy one spec for two briefs is really a privacy job on a bay, price internal louvres and stop forcing a cassette to do joinery.
How to use the figure
The 4.2 by 1.2 metre opening inside Do not buy one spec for two briefs 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 wired motor, and the illustration is £4,042. 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 Do not buy one spec for two briefs, 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. Do not buy one spec for two briefs covers one kind of opening. The house may have three.
When I would not order yet
Do not buy one spec for two briefs 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 Do not buy one spec for two briefs 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. £4,042 illustrates Do not buy one spec for two briefs for a 4.2 by 1.2 metre opening with a wired motor, 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 5.04 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 Do not buy one spec for two briefs 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. Do not buy one spec for two briefs uses a wired motor in the example so you can see how much the motor choice moves £4,042.