Mike

Personally I hate baths, so would just have a shower...

Mainly central heating, hot water & MVHR system. But it could also be a place for an ethernet hub and other things too, and double up as a space for washing machines etc. If you're near a flight path you certainly won't want trickle vents in your windows, so I'd look very seriously at an MVHR system. I'd also look at the specification for the glazing - you'll probably want at least 1 pane of Pilkington Optiphon to cut noise transmission.

Does indeed look good! Some thoughts on the layout: Add a compass direction arrow to the floor plans Move the doors into Bed 2 and the bathroom further 'up' the page (north?) to incorporate the airing cupboard into the hall, to make space for full-width wardrobes in Bed 2? Consider whether to make windows smaller to accommodate wardrobes in Bed 3. Consider a double partition for additional soundproofing between the master bedroom and the bathroom, unless you're planning a full fitted wardrobe there (I guess you may well be)? Don't narrow-down the width of the en-suite for the shower - you have enough space to be more generous. Put the shower above the bath (in the location of the shower)? Is the loft going to be accessible (maybe not, in view of its size); if so, how will it be accessed? Especially as you don't have much of a roof space, add a plant room to the basement? Does your LA specify a minimum garage size? Taking into account the stairs, is it big enough to comply? Provision for an electric car charging point in the garage? Do you have space for horizontal and vertical for MVHR ducting? Think about adding solar shading to prevent summer overheating Large windows facing north aren't great for minimising winter heat loss, though you're limited by the plot orientation Looks like the roof may be perfectly flat? Some fall (1:40?) is likely to be recommended.

Thanks @Ferdinand Your thread and @Jeremy Harris tip mentioned in it (re Unico units) has kept me busy of the day and lead to some more options that might work. All towards the upper end of the price range you mentioned though. Turns out that the Olimpia Splendid Unico range includes a couple of options in addition to the single room model, with heat pumps, so usable for warming too. One with the option to feed a second unit up to 10m away (perhaps most useful in my case , for bedroom + living room), and another that heats a 50L DHW tank. All of them are based on through-wall-vents being one side of the wall with the aircon unit on the other, rather than having a air supply that can be ducted further. Although I guess I could probably duct them anyway if necessary, subject to adding a condensation trap and using smooth walled ducting. http://zymbo.eu.url (Chinese made, Italian site, PDFs in English) also has several through-the-wall models. There's also Fimer's Windy range, different in that they they use a single hole though the wall with a pair of concentric pipes, though I'm not keen on their styling. Finally, I also found Airwell GCAO, which has a water condenser, rather than using outside air. Consequently it can be located anywhere within range of a water supply, and can be connected to one or more remote wall or ceiling cooling units. On the downside, it only does cooling, and it also throws away hot(?) water - 90 litres / hour for the base model, if I've understood their data sheet properly - which I may not have, as it suggests the water is only at 15°C (page 6, English in the right hand column). I do wonder if I could turn that into a closed circuit by running the waste water though a DHW tank, and loosing excess heat though a heat exchanger in the MVHR extract duct, with some way of capping the aircon level to match, but there are probably several gaps in that idea, apart from the cost. Anyway, further ideas are still very welcome.

I have a 40m² apartment several floors up that I'll be stripping and modernising in France. Despite the high levels of insulation + airtightness + external window blinds that I'm planning, it will get pretty hot in summer, so I'd like to take the edge off that. There's no chance of installing an external heat pump, due to conservation area restrictions and the only place to hang it being within 2m of a couple of bedroom windows. However it might be possible to draw in and expel a modest amount of air through a duct - either through the external wall, or potentially by lining a couple of old chimney flues - to supply a small internal duct-mounted (or at least duct-fed) heat pump. It could either be connected to in a post heater / cooler to cool the air in the separate MVHR system, or I could connect it to the planned wet UFCH system. Does anyone knows of a suitable heat pump (that's also fairly small, quiet and affordable!) that might work? Ideas welcome.

I'd agree with your first 2 points, but it's an existing roof that needs replacing (not on my house). Your 3rd point is quite correct too, but I'd not envisaged it being permanently in switch on - just manually switched on for a monthly test Except that it's a GRP flat roof that's failed prematurely. That's not to say that there's an intrinsic problem with GRP but, since it's formed in place rather than in a factory, it is (like other types of flat roofing) still subject to problems of sub-standard installation.

Does anyone have any experience of embedding moisture sensors in the substrate of a new flat roof, in order to detect future leaks? Or any suggestions of how it might best be done? Not that leaks should happen for many years, but if/when they happen, it would be cool to get an early warning, rather than waiting until water damage becomes visible...