ProDave

Yes to all of those for me. But the average person in an existing house heated with a gas boiler and radiators, no to most of them. they might not change their minds until the price of gas rockets above the price of electricity.

Yes it is not rocket science. At the moment, at best, a well installed heat pump working well will just about match the running cost of a gas boiler. That is not much of a selling point is it? Most of us on here do it for other reasons, mine being no mains gas here, and I did not want an oil tank.

Global sea level rise over the next 100 years is inevitable. What are "they" planning to cope with that. What about all the low lying coastal towns and cities that may be under water? At what point do you stop planning defensive walls and start planning relocation?

We built our first self build just over 20 years ago. I knew nothing then of passive houses. But coming from a 1930's semi with solid walls and high heating bills, the "standard" timber frame build of the time was very warm, comfortable and not outrageously expensive to heat. but it had many shortfalls, mainly as I have discussed before, the huge amount of holes in the structure forced by building regs to have extract fans in so many rooms, and other "standard" things like a cat flap, a letter box and a non room sealed WBS. In the time between that and starting our second build I did a spell of work for a local company building "low energy" modular homes. I learned a lot about insulation, air tightness and MVHR from that. So that is the principles we applied to out second self build. My 2 main things, I wanted a heating load low enough to be satisfied by a small ASHP. We have no mains gas, and I did not want an oil tank or bulk gas tank in the garden. And I wanted air tight and mvhr with no unnecessary openings in the building structure. So no cat flap or letterbox, no individual extract fans (that most of the time are just a hole to let heat out and draughts in) and an air tight structure. We achieved that and are pleased with the result. I think the term "Passive House" is confusing to the layman, they expect a house that needs no heating. I don't think that is possible in most of the UK.

No sorry I don't. At the time I was scouring all sorts of on line suppliers and merchants and I stumbled upon it, or more likely someone on here pointed me to it. It did the job well but I can't find it again right now.

I have this arrangement: To the right is the stack pipe coming down from upstairs then straight down into a rest bend. The 110 sticking up is where the downstairs WC connects. The 50mm branch at the left is washing machine and sink discharge. It has never blocked, probably because unlike @MortarThePoint outside pipe, this has a regular flow of grey water into that 50mm end pipe to keep it flushed free of any solids that are reluctant to move of their own accord.

Another thing with posts, you need to dig a nice parallel sided hole. At one previous house a neighbour had a fence installed. The contractors were not very careful, and the first gale, many of the posts simply pivoted out of the cone shaped hole with a cone shape block of concrete still attached.

Used crushed / irregular stones, they will lock together and not move much. Do not use rounded "pebbles" it will be like walking on marbles. (a mistake I only made once when ordering 20mm stones from a builders merchant without seeing them or asking any more details)

Could you actually see movement at the base where it comes out of the ground? It is surprising just how much concrete posts will bend so movement at the top if solid at the bottom is okay. However it does look to me like they filled the holes not with concrete, but with bricklaying mortar, probably because they had plenty of that on site ready?

I looked into GSHP's for here. I soon concluded even if I did all the digging work to lay the slinky myself, the cost of the pipe, fittings, and the brine to fill it was way more than the cost of the GSHP. Then when you see the advice is replace the brine every 10 years, the ongoing costs outweigh the additional efficiency compared to an ASHP.

+1001 BC are not interested in that. We formed the entrance, got services connected and the static caravan on site before we even started on the building warrant.

If it has planning that is locked in because the development is clearly "started" then just go ahead and create the entrance using the details on the plans that are already approved. THEN think about a new planning application, knowing you can still fall back on the existing "started" application if that is refused.

That is for a Scottish temporary habitation certificate, I don't think England has such a formal process.

I got this written into the planning for ours, that I wanted the static caravan to remain after the build as a "garden building". This overruled the usual clause saying the static caravan must be removed. Instead they inserted an alternative clause "habitational use of the caravan shall cease upon occupation of the house" They are just ensuring you don't end up with the caravan as a second separate dwelling.

In principle you should be able to find the structural points of the wall at first floor height (that will probably be supporting the other floors) and span a floor from those. but to access your new mezanine floor you will need a short staircase up from the half landing but there I see a problem, those stairs will be cutting across a dooorway. Picture from below may help?