S A P -> E P C -> R H I
Posted 17 January 2016 - 02:21 PM
But, searching eBuild on another subject drew my attention to SAP Calcs not being required for a Change of Use Conversion. My build is the conversion of an agricultural building to house.
Having searched further and checking what the Building Control chap has requested, it does indeed appear that I only need to supply basic U-Value info and not full SAP calcs.
I assume BC will require and EPC certificate, although it's not been stated. And I may wish to take advantage of RHI (or FiT), which will require an EPC.
Here's where I'm going round in circles... Can you get an EPC, without doing SAP calcs?
And, what's my simplest route to an EPC.
Posted 17 January 2016 - 03:14 PM
Building control will usually use the minimum fabric requirements in Part L for conversions/renovations, so you'll still need to play around with U values to balance things like window area versus wall and roof insulation levels and some of the other little awkward things that can arise. If the conversion is straightforward, without loads of glazing etc, then it should be fairly painless to get things to meet the requirements.
Worth bearing in mind that the Part L requirements are appallingly low, far lower than those for any other country in Europe, so it would be a good idea to try and exceed them by a fair margin if you want a comfortable house that doesn't cost a fortune to heat.
Posted 17 January 2016 - 03:39 PM
I'm comfortable with the design of the conversion, having had PHPP analysis completed and am around the 15kW/m2/yr point. SAP calcs would therefore not have informed the design, but would be just to keep BC happy.
Hopefully the simplified rdSAP ticks the bureaucratic boxes, or at least it will produce an EPC that does.
It may be an advantage for RHI. Maybe the assumed values within rdSAP will indicate higher energy requirements and therefore a better RHI...
Is there any free software for rdSAP that you know of? It would be good to have a play before engaging an approved energy assessor to produce the EPC.
Posted 17 January 2016 - 04:30 PM
Posted 18 January 2016 - 09:38 AM
Building Regs, Appr Docs L1A & L1B do not recognise rdSAP - all calcs here must be to full SAP. For conversion/change of use the SAP generates the EPC on completion (may be required if BCO picks up an issue with max opening area). Compliance here is shown by elemental U-values (poor though they are!)
Posted 28 April 2016 - 08:35 AM
EPCs for newly created dwellings have to be created by SAP software, and produced by licensed Energy Assessors.
So you need SAP calcs for the EPC, regardless of whether the dwelling has to meet Part L Building Regs, or just meet AD L1B requirements?
rdSAP is for existing dwellings, not newly created dwellings.
I hope this adds clarity to the above? :-)