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I've just run across the concept of the "Solar Loft", as proposed for a new 'Eco' development at Bickleigh Village in Plymouth, by Bill Dunster's ZEDProjects operation and Social Investment Company Cornerstone.This is a space outside the superinsulated perimeter on the top storey of a house, with insulation in the floor, and polysolar panels for the roof. These are less efficient than traditional solar panels, but also let a proportion of the light through, and have been suggested elsewhere as a way of mitigating the roast-freeze cycle which occurs in many conservatories.The development is a high density development on the majority of a somewhat larger site - 91 houses in 3.06Ha, with 0.63Ha of woodland left untouched. Most of the houses are 4 or 5 bedrooms. The 5 beds currently advertised are £350,000.I like that strategy, though it leaves teeny-tiny back gardens. The Planning Reference is Plymouth Council 12/01504/FUL and 14/00135/FUL. The latter is currently under consideration, and would increase the proportion of larger homes in response to market demand.There are also live-work units and a building to provide employment for local people as a mini assembly plant for the buildings on the site, which will hopefully roll over into some sort of eco-construction hub for the future. They have done quite well in negotiating a good reduction in the various Section 106 obligations while leaving a notional 20% profit margin.I have not tracked down whether Community Infrastructure Levy will apply, though in most of Plymouth that is only £30 per square meter for residential anyway.I have attached detail of the solar loft for one house type, as included in the Planning Application. As shown, this drawing is copyright the ZEDfactory, and is excerpted here for critique and review.A Solar Loft is a way of using the "low" part of an asymmetric (for South Facing Solar reasons) roof for a benefit without having to add the extra height required to give a fully recognised useable room. The brochure for the development describes it in marketing-ese:At the top of the house a semi-transparent PV roof creates a stunning ‘solar loft’, allowing atmospheric dappled sunlight to flood into the highest room with the best view. The room is designed with good levels of cross-ventilation to avoid overheating and provides an ideal growing space for keen gardeners, or a relaxing sunspace for those more inclined to putting their feet up with a cup of coffee.(Ed: From that, you'd expect it to come with a built-in elf riding a unicorn through the velvety green fields of Arcadia.)It's also an ideal growing environment for your own heat demanding, high humidity requiring crop for quiet sale on the local market. I wonder how many of the people will insulate the roof to stop the heat showing, use the power on tap from the panels, and put something else in there to grow that is not tomatoes?At least that would reduce the number noisy helicopters circling overhead with thermal cameras, since the technology will no longer work.I like the idea, but I think that in the circumstances, I might be more inclined to hoick the whole part of the roof up by about 600-900mm to be level with the ridgeline, and gain a semi-sun-sheltered roof terrance, with the solar panels divided into two sections.If there were privacy concerns for neighbours, then I'd perhaps put a vertical piece of polysolar "window" down the top 1-2m of the wall too.It could be like a balcony in a seraglio; more complex to build than a solar loft, but perhaps more attractive as a foil to the small garden.What do you think?(Photo quoted from Bickleigh Eco Village brochure.)