Dave Jones

though you were on about running it 7c below dew point ?

the issue you will have is running the ASHP cold enough for those industrial size units will be waaaaay to cold for the UFH loop. will get condensation everyhere, any missing lagging and it will be dripping out. The dew point today for us is 21c and you can feel the humidity, still ok at 17c flow temp though as its only peking for a few hours.

just ask for a 3-phase supply, they will insist on it anyway.

our miele is 40 mins tops on full load.

dont need downstairs the UFH loop keeps it like a fridge. get the larger of the three and leave them on auto 24 x 7, no more noise than a typical indoor AC unit. If its put up with a fan or 32C i know which i'll pick!

ASHP tumble dryer, expensive up front but ours very economical to run. Free in daytime virtually all year with solar.

my understanding is house only.

huws grey ordered them in.

had similar on ours, nimbie infestation who moaned about everything. They spotted we changed a 1800x 1050 window for 1800 x 1400 (window seat) and had enforcement out. NMA flew though no issues at all. Just cost.

could just accidentally burn the place down and get a new one! https://www.bbc.co.uk/news/uk-england-stoke-staffordshire-68414524

octopus are taking signups for a lease package of BYD and wall charger to use your car as a battery for the house. First DNO approved system. Looking at ordering the charger as it should work with our ID4 as it is V2G ready supposedly.

36C outside yesterday. The aquarea purring away at 16c (ramping up/down automatically to keep the right side of the wet bulb). walking into the ground floor is like walking into a fridge even theough its 21, the ufh loop does its work. The bedrooms though with the panasonic fan coils are sitting at 21 while the bathroom and landing are 26/8. CoP is reported as 27, although i guess its not setup for cooling ? Free anyway with the mega excess of solar. added the new 2025 model into the loft and also included the condensate drain, this is the largest unit they do and the heat exchanger is about 80cm wide so should be a beast for cooling.

that calc looks wrong. its the uncorrected U value by the looks. try https://www.changeplan.co.uk/

if your build is 3 month stasrt to finish timber frame is worth the premium if not your wasting the double cost of a timber frame over a standard build. that wasted cash can buy a lot of 2nd fix items.

link to the blocks with 0.09 U ? aerated conc are crap for air tightness and the normal ones are 0.15U still a fail for regs.

you need to lift a lid and see what size pipe it is. Highly unlikely you will be allowed to build over. They would insist on a divert if thats even possible. £££££££££££££££££££££££££ be very very careful

without question fancoil units in bedrooms. primarily for cooling. wouldnt be without them having experienced last summer.

sure about that ?

Is it bare soil or stoned already ? DPM membrane ? normal practice is 100mm hardcore whacked, sand blinded, DPM lapped up to house DPC, insulation min 150, screed 75mm

you have a QS price the foundations same as all the other build elements. The bank will use this to pay you. Zero chance for ambiguity then!

use a building warrant and avoid having to pay for any paperwork. dead cash. Just provide the normal certs on completion for signoff.

you dont need sign offs to get paid. When the QS visits, he will check the progress on elements. for example if the walls are half done you can claim half the QS cost. 3 out of 5 windows in same etc etc They wont pay for any materials on site that are not built in. Found them very reasonable. Go through your QS and mark it up showing % completion of the elements and email it them before the visit.

150 cav is much easier to source batts for and is also the minimum cavity to meet new build spec when using batts. just because your extension doesnt have to meet new build regs, i'd still not want a poorer standard. no need for any internal insulation then.

good luck ever getting close to having a builder complete that. You need a rocket scientist ! You have 6 different types of membranes in that 'detail' Have to keep it much simpler to stand a chance of getting it done correctly.