Mike

I've had a BCO reject doing it that way because it wouldn't be guaranteed to be self-cleaning - that is, any 'residue' that build up where the branch meets the main channel would not get washed away. The sketch above is more-or-less identical to the solution agreed. No rodding point needed provided the bend is not more than 45° and is directly off / within a short distance of the IC (1 or 2m, from memory - check the regs / manufacturer's instructions). In my case no pipes had been laid so no issue.

No - only grapes & English wines, which can be excellent :)

I've dug up another resource that includes some useful content (as well as a lot of high-level stuff that won't be): EU-level technical guidance on adapting buildings to climate change

If there is no DPC in the wall - I'd guess there isn't - then if you block the moisture in the ground from escaping due to impermeable insulation or a DPM, it will tend to escape through the wall where it may cause a build-up of salts in the wall / plaster. I'd therefore be thinking about choosing the right hand side of your sketch but using limecrete in place of concrete. This isn't something that I've been involved with, but there are some pointers & further links at https://www.greenspec.co.uk/building-design/limecrete-floors-for-old-buildings/ You'll also need to convince your BCO.

I'd move the IC & add a 45° bend so that the WC makes use of the main channel and connect the SVP run to the branch. But make sure your BCO is happy.

In addition to the Building Regs, the 'principal designer' - i.e. you, if you haven't formally appointed anyone else to the task - is required to comply with the the CDM (Construction Design and Management) Regs. They make them / you legally responsible for eliminating safety risks during construction, cleaning, maintenance & demolition (or mitigating the risk if that's impossible) at design stage, involving a risk assessment. They come with some pretty severe potential penalties. Handrails or walk-on glass might be adequate solutions, but I see no obvious way of dispensing with both while being able to safely clean or repair the windows & the rest of the structure above.

A good list, though I'd tweak these: Larger roof overhangs for better shading and and rain protection - given enough space, consider turning the overhangs into a veranda or loggia High maintenance 'green' roofs are probably not an alternative that is sustainable in the UK climate going forward - select the right plants; it's even possible in a Mediterranean climate - https://encyclopedia.pub/entry/52357 Plenty of fruit trees - olive trees to minimise watering? Breathable (sorbative) insulation and high decrement delay wall materials wherever practicable - plus clay or lime based painted internal finishes External shades or shutters on South and West facing windows - consider adding them on exposed East facing windows too. Plants (vines?) running up & over a pergola would be an alternative No 'smart devices' whatsoever to go wrong/be held hostage to - a good idea not to rely on them (at least have a conventional alternative too), but the risk is somewhat lower if they're not exposed to the Internet ...and consider these (though most are more applicable to a whole house, rather than an extension): Minimise hard paving in favour of planting Make the building airtight + add MVHR for ventilation Make provision for natural cross-ventilation with openable windows on opposite sides of the building Use UFCH designed to allow cooling (if only in the future) Add PV panels Choose appliances with top energy ratings to minimise their heat output

There's some useful information on one of their other pages about that & the need for documentary evidence here : https://www.epcworks.co.uk/improve-your-epc/documentary-evidence/

Well spotted. It's an interesting case study, contains useful pointers and shows that there are some conscientious assessors out there (and why most wouldn't want the hassle). It seems though that they overrode the default values in rdSAP, rather than applying full SAP. Probably.

Good point Actually, that's probably working as expected as 20° is the 'normal' supply air temperature in 'fixed mode', and the Q series has an adaptive bypass (it can be partly open, not just on or off) However there are a couple of ways you can change that in the advanced settings - see this user manual extract :

That would be my guess (plus a little picked up within the unit itself). Varying the time the air spends in the ducts by changing the fan speed might test that - slightly warmer air on a slow fan and slightly cooler on boost? I can't try it on my Zehnder CA225 as I don't have a temperature readout.

I'm still deciding which hand to use in France...

Yes, mostly. The Building Regulations went metric in 1972 and the construction industry followed by 1975. However, to add confusion, some products haven't actually change dimensions while others have.

However such restrictions could be voided by the law, as has happened in Germany. I'd sit on my hands for now and see what happens.

The rise of the professional politician? https://commonslibrary.parliament.uk/the-diversity-of-mps-elected-in-2015-pale-male-and-stale/