Tue, 14 Apr 2026 10:12:46 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17296&Focus=293310#Comment_293310 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17296&Focus=293310#Comment_293310 Tue, 23 Nov 2021 12:23:12 +0000 Dominic Cooney It's only a draft at the moment because it isn't quite finished yet, but I was delighted that it came out at a "B"

Better than the "C" that we got for the last place we did (of similar solid stone wall construction)

The only thing we could have done better on would be PV but the roof is East/West and I don't think we have any room inside for invertor(s) but I would not rule it out in the future.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17296&Focus=293311#Comment_293311 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17296&Focus=293311#Comment_293311 Tue, 23 Nov 2021 12:25:57 +0000 Dominic Cooney Primary Energy Demand
not to exceed 120kWh annually for all domestic applications (heating, cooling, hot water and domestic electricity) per square meter of usable living space.

the draft SAP EPC says:]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17296&Focus=293312#Comment_293312 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17296&Focus=293312#Comment_293312 Tue, 23 Nov 2021 12:28:59 +0000 Dominic Cooney But in any case, I don't think we are near the 15kWh per square metre per annum for space heating alone.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17296&Focus=293314#Comment_293314 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17296&Focus=293314#Comment_293314 Tue, 23 Nov 2021 13:01:41 +0000 djh Posted By: Dominic CooneyThe Passivehouse website says:
Primary Energy Demand
not to exceed 120kWh annually for all domestic applications (heating, cooling, hot water and domestic electricity) per square meter of usable living space.
Which Passivehouse website is that?

According to https://passivehouse.com/ (the PHI website) and specifically https://passivehouse.com/02_informations/02_passive-house-requirements/02_passive-house-requirements.htm "The Renewable Renewable Primary Energy Demand (PER, according to PHI method), the total energy to be used for all domestic applications (heating, hot water and domestic electricity) must not exceed 60 kWh per square meter of treated floor area per year for Passive House Classic."

There's also some discussion of standards at https://passipedia.org/basics/energy_and_ecology/primary_energy_quantifying_sustainability

PH originates from German standards, which differ from SAP / BRE methodology so any resemblance between the numbers would be pretty much coincidental.

But anyway, well done on your EPC result :)]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17296&Focus=293316#Comment_293316 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17296&Focus=293316#Comment_293316 Tue, 23 Nov 2021 13:26:37 +0000 Dominic Cooney
https://passivehouse-international.org/index.php?page_id=150]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17296&Focus=293318#Comment_293318 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17296&Focus=293318#Comment_293318 Tue, 23 Nov 2021 13:44:14 +0000 djh https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17296&Focus=293321#Comment_293321 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17296&Focus=293321#Comment_293321 Tue, 23 Nov 2021 14:17:32 +0000 Dominic Cooney https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17296&Focus=293324#Comment_293324 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17296&Focus=293324#Comment_293324 Tue, 23 Nov 2021 17:41:35 +0000 WillInAberdeen
The updated figure in forthcoming SAP 10.2 is 1.50, half as much, reflecting the reduction in coal power stations and increase in wind/solar electricity, which are assigned a much better primary energy efficiency.

If in future your EPC is redone with SAP 10, the primary energy demand reported on the certificate should get even better than you already have!

Likewise the carbon emissions of the energy used in the building should get even better, in line with the national reduction in carbon intensity.

I don't know how PH handles all this sorry. I understand there are differences with SAP how they handle electricity imports vs electricity generated on site, and building energy consumption vs heatpump electricity consumption.]]>