MikeSharp01

Welcome to THE forum for people like us.

The house has MVHR so it looks like the overall outer envelope is what the calc should based upon that not individual spaces I would have thought. The whole place at a common temperature is the goal really although I suppose many would want the bedrooms cooler than the living area so that might be a problem. Life is full of compromises.

Welcome to the forum.

This is actually an MCS allowed scheme as far as I can see. https://mcscertified.com/umbrella-schemes/

Eeeek scream. Your house looks like it has been built to, or close to, Passive house standard so something odd is going on somewhere, I don't get why the double height space needs special attention and MVHR must have an impact as it recovers 80%+ of the heat normally lost in air changes.

Great it is sorted but you dodged a fire there, wonder what caused the 100A isolator to burn out, is it switched on/off under load regularly?

I find push down simple enough, you can label it up simply and from the front it looks much tidier with short patch leads.

Although that sounds odd, many think fibre should be faster unless you are on a low data rate tariff. Actually the theoretical Max data rate on 4G is 1Gbs for stationary users while domestic fibre can easily make well over 1Gbs, max in UK is 10Gbs, but the theoretical top is 5G which can max out at 20Gbs - in theory. The issue with them all is the infrastructure and number of users concentrated on your pathway. If you live near a motorway with a big jam suddenly you have a vast number of people using the 4/5G network and in the end that all hits the fibre backbone anyway. Oh and yes you will definitely want power to your data cabinet.

Router > switch > patch panel which connects to the sockets around the place. The switch may need to supply power to the sockets it's called POE (Power Over Ethernet), EG for camera's, wifi access points. This means you buy a switch with a number of POE outlets and the rest normal. If you want to use the CAT6 for anything special - EG HDMI over CAT6 then you will need some additional tech.

Its a long walk everywhere upstairs and you have to go to bed via the wardrobe, the study bedroom appears to have the desk chair on the bed and there are several places where doors clash.

We used Resorcinol PRF Resin Adhesive for our work, its a two part so needs carefully mixing. https://woodadhesives.akzonobel.com/en/adhesive-technologies/phenol-resorcinol-formaldehyde

Yes we should build fast reliable railways with cheap fares so we don't need to drive places.

Yes, sadly, or perhaps not, none of the chaps who took part in the Hatton Garden job seem to be members. Image from the FT.

To get the right answer you will need a number of them so the interactions can be accounted for.

I think I read of an unwillingness of structural engineers to try to calculate this, as so much depends on the quality of the glue You are right. We had the same plan as you - our portals would have been 9m wide and 5m tall. Our SE worked it out and showed it could not be done as a site build and probably only just marginal for a factory build. Our gussets are 15mm thick, we have a ridge beam supporting the top and has four gluelams / kerto beams across the space to stop it spreading. We built it on site with structural glue and process to SE spec but a portal it isn't. I think @Gone West did manage an I beam portal frame built in a factory IIRC.

Looks to me like you need a structural engineer to look at this as I have an odd feeling those gusset plates, screws and structural glue and all, won't be up to the job you are expecting of them.

would have thought that one 50mm AAV would be enough, its the vac cum you want to break after all. If you are working with building Control you could check with them what they deem acceptable.

Yes AND having fluffy towels does not preclude you from complaining about your energy bills BECAUSE, after all, you are entitled to cheap electricity so you can waste it fluffing up your towels.

Was your old boiler a combi or did it feed the cylinder? So essentially what has changed?

Does the dual ring system not need to switch the power to the second ring so there must be a contactor or some such controlled from the meter not sure if a smart meter has an output for this so not sure how it works the once then never again! Maybe I missed something though it is beer o'clock.

You can do it with Therm. Here is a natty video on how it could be done.

If its a well insulated slab and a large area then you have enough output area for the whole house, if you do the sums, 180m2 slab, with UFH gives you 180m2 of heat output to warm the house. We have tall vertical multi hollow pipe rads here, they are good for output area but if you have a 10 pipe version of these 3m tall (ours are 2m) you only have about 5m2 of heat output or approx 3% of the slab area per rad. Ask your plumber to install towel rads in the bath rooms so they can keep the towels cosy and that should be enough. With that much PV you can retro fit some electric heaters but you won't need to.

Sounds like a great project in a truly wonderful place - building in a national park must add some small costs but is neutral in most dimensions assuming labour can be locally sourced. Are there any caveats around affordable housing etc for the build - are they for local people or will the wealthy coves from Edinburgh and Glasgow rush in a snaffle them up for holiday homes? If they are able to do that it would raise the base price, and hence your headroom, albeit at some disadvantage to the local people.

Sorry I perhaps was not clear. The reason we will have an ASHP is more nuanced than the AECB approach (was a member for about 5 years but have let that lapse.) On our original plan, 2018, we had a gas boiler - no problem getting PH requirements. We decided we didn't want gas for all the reasons we now understand so well. As I was quite taken with the work @TerryE had done with the Willis heaters that was, until late last year, our plan. However, when you go direct electric heating everything else needs tightening up to meet the energy limitations for the house which we did but now as we are further into the build the room for maneuver is limited. Then we noticed that the EPC system trips in and you cannot get a good EPC, see discussion elsewhere on this forum, with direct electric heating! So although we could get PH certification, just, the EPC would have been rubbish and as we feel the need for both we will adopt an ASHP to make it all hang together again - PH certification possible and a, hopefully, better that 100 EPC. For us the spin off will be very low heating bills and a warm airtight home that matches our personal 'machine for living in' requirments - certificate or no certificate. So no different to anybody else really. SO I will now jump down from the head of this pin. Is that the annual cost?

Tend to agree, although, it rings a bit hollow having spent yesterday at a graduation ceremony for 600 Engineering and Science students all of whom got a certificate telling other people what the students and the staff already know so sometimes it is for other peoples consumption and holding it has a personal value. I also happen to think that the Passive House standard is now getting better understood and much more widely talked about so we may well be heading the way of more acceptability of the certificates value among buyers.