Dave Jones

id stick to 75mm screed, not much cover above the pipes with 50mm

i did think the same but its massively more costly and hassle to do underfloor for 1st floor. In the end its not needed, if anything upstairs is too warm at night even with heating on fallback after 6pm. Bathrooms we have electric wet rads all controlled by home assistant as somewhere to dump spare solar/free sessions and ride the cheap rate sessions. Karndean floor is not cold once ambient air temp is 21 anyway.

needs planning, truss company needs to know so they can account for the weight, will probably need to sit on a stud wall below to take the weight. You need to lift it 400mm off the 'floor' of the loft so you can insulate under it, there is risk of freezing. https://www.discountheating.com/telford-tempest-300-litre-unvented-horizontal-indirect-heat-pump-cylinder.html

exactly. i think they are more for heat but at the price would take several lifetimes to pay back.

yes of course, its good idea as you will get invert levels for drains etc as well.

Looks like it

yes will be fine, you need to order ballast.

could install a loft unit to force airflow https://store.beamcentralsystems.com/products/axco-loft-mounted-positive-input-ventilation-piv#:~:text=Designed to run continuously%2C the,generating fresh filtered air throughout.

crap, made zero difference to cooling. Hoping it will be better for heating. Definately wouldnt bother with one again.

of course any of them can, highways,sewer etc etc

waste of time upstairs really, shouldn't be a need for heat in bedrooms with a well built insulated and air tight house.

be aware a pre-app doesn't necessarily goto all the statutory consultees any of which can kill the application even if planner approves.

err, simplify. zero zones and open loop. nice and easy

bit like speeding, only an issue when caught....

careful, you need a licence to use those. Big fines if caught.

hire a towable bowser from trav/brandons etc for peanuts a week and fill it at home ?

dont forget fancoils are very good for heating as well, small footprint large output.

would lose a fair bit of space to mount them as they are very deep, could be a solution for hallways/landings though. Just check they have a condensate drain.

agree, simple and straightforward process.

who designed it, set flow rates etc ? Ours has a couple massive silencers on the unit itself and another 6 or so box silencers throughout the house. Cant hear anything with ear next to the plenum on boost.

sure its not the FFL level that is out/not accounted for ? Very very strange for even the roughest chippy to set 2 doors to 2 completely different heights.

we use a nuki lock, full apple integration. hey siri open door. same as garage door opener.

unlikely. Does it include all the 2nd fix items ? Structure below DPC ? Steels ? All the fees (warranty, SE, SAP, Bio etcetc) ? Probably need to add a third again then another 20% of the lot as a contingency.

You will definitely be below market rates using free labour but if you need to borrow against the build to fund it you will need to get is QS'd real world which means £3-5k m2. Doesn't mean you have to spend all that but alarm bells will go off with the lenders if you start quoting fantasy m2 rates. plenty of cheap online QS services who will take your plans and price them to the nail. Bear in mind they exclude 2nd fix items, anything below DPC unless you provide them the spec, steels etc unless you give them a SE drawing. Also account for all the paperwork fees and there are a lot now, warranty, insurances, bio-diversity, SE, SAP, etc etc another £15-25k Plot sounds expensive for the area.

one of the many many advantages of using microinverters.