IanR Posted September 28, 2017 Share Posted September 28, 2017 7 minutes ago, joe90 said: I was charged £250 for the design SAP ( the architect was expensive in hindsight as I did all the designing, he just put it on CAD and printed copies for the building regs and builder). Hopefully that was for an "official" SAP, that can then go forward to produce the as-built. If he's not an accredited energy assessor then he's likely to have contracted that out and you've been charged a management fee. The most cost effective route may be to go back to him to produce the as-built. If the Design SAP was official, it should be a minor update to produce the as-built Link to comment Share on other sites More sharing options...
Ferdinand Posted September 28, 2017 Share Posted September 28, 2017 (edited) Is there a chance that the former EPC assessor might send me a copy of their file? I know they anyone else is not allowed to use it, so it is not as if it will take away work or anything . My chalet-bungalow is currently an EPC 74, with 17% of light assessed as low energy fittings (previous owner iriots!) and no solar. It says that low energy bulbs take me up to 77 (*), and 2.5kWp solar would take that up to 83. So if I have 100% of low-energy light fittings, and 10kWp solar - which I have now - what could my number be? We also have a brand new high efficiency boiler. If the solar benefits are linear to EPC, then that makes it another 18, which gets me to 101. Likely? [Update: Playing a bit with Stroma for the Little Brown Bungalow the PV impact is *huge*. Very tempted to get one done on my house to lock in the number before they nobble the algorithm again to promote the next big thing.] Ferdinand (*) We have *oodles* (=about 75-80) of GU10 recessed and mounted spotlights, curse their little cotton socks. Edited September 28, 2017 by Ferdinand Link to comment Share on other sites More sharing options...
Jeremy Harris Posted September 28, 2017 Share Posted September 28, 2017 (edited) I did both my design SAP and as-built SAP, but had to pay an assessor £100 to check my as-built file and lodge the EPC. I used FSAP to do mine, not that hard to get to grips with. I passed the design SAP details to BC and they were perfectly happy to accept my own work at that stage, it's only for the as-built SAP where you hit the monopolistic business that only a registered assessor is allowed to submit the chit. A typical, over-regulated, government job creation scheme, in my view I've just checked and the design EPC was A102, the as-built EPC was A107. Edited September 28, 2017 by JSHarris Link to comment Share on other sites More sharing options...
IanR Posted September 28, 2017 Share Posted September 28, 2017 4 minutes ago, Ferdinand said: Is there a chance that the former EPC assessor might send me a copy of their file? My request for the same was politely declined, but the assessor offered to run all the different scenarios I wanted. Link to comment Share on other sites More sharing options...
PeterW Posted September 28, 2017 Share Posted September 28, 2017 12 minutes ago, IanR said: But you still need an EPC for you BC completion Cert... don't you? Only for a new build .... conversations that are done under Part L1B are exempt from all the stuff such as pressure testing and other shenanigans ... I'll still be doing a home brew pressure test though but it's not needed for any calcs for BCO. Link to comment Share on other sites More sharing options...
IanR Posted September 28, 2017 Share Posted September 28, 2017 (edited) 3 minutes ago, PeterW said: Only for a new build .... conversations that are done under Part L1B are exempt from all the stuff such as pressure testing and other shenanigans ... I'll still be doing a home brew pressure test though but it's not needed for any calcs for BCO. Interesting, I've not been required to do the Air Test (so a figure of 15 ACH went forward to the SAP), but BC have requested a registered EPC for the completion cert. -mine's a CoU Agri to Resi I didn't look into this as I needed the EPC for RHI anyhow. Edited September 28, 2017 by IanR Link to comment Share on other sites More sharing options...
Jeremy Harris Posted September 28, 2017 Share Posted September 28, 2017 48 minutes ago, IanR said: Interesting, I've not been required to do the Air Test (so a figure of 15 ACH went forward to the SAP), but BC have requested a registered EPC for the completion cert. -mine's a CoU Agri to Resi I didn't look into this as I needed the EPC for RHI anyhow. The default SAP air permeability isn't 15 ACH at 50 Pa, it's 15 m³/m²/h at 50Pa. There's a big difference between the two methods of measurement. SAP is, as far as I know, the only energy efficiency assessment method that uses these units for air permeability. Pretty much everyone else in the world, including the PassivHaus Institut, use air changes per hour at 50 Pa pressure differential. Link to comment Share on other sites More sharing options...
IanR Posted September 28, 2017 Share Posted September 28, 2017 Just now, JSHarris said: The default SAP air permeability isn't 15 ACH at 50 Pa, it's 15 m³/m²/h at 50Pa. Quite right. Link to comment Share on other sites More sharing options...
ADLIan Posted September 28, 2017 Share Posted September 28, 2017 For conversion to dwelling work EPC still required. No air permeability test required under Regs so default of 15 is used. You can still get test done and use that value in the as built. Link to comment Share on other sites More sharing options...
MikeSharp01 Posted September 28, 2017 Author Share Posted September 28, 2017 3 hours ago, PeterStarck said: So, if 6Kw gets you to 101 and 8Kw gets you to 107, does it follow that 4Kw would reduce it to 95? Yep that is what our energy assessor said. So 2Kw = 6 SAP points in our case. Link to comment Share on other sites More sharing options...
Gone West Posted September 28, 2017 Share Posted September 28, 2017 3 hours ago, MikeSharp01 said: Yep that is what our energy assessor said. So 2Kw = 6 SAP points in our case. Something has gone wrong there. Can't attribute that to me, it was NSS. Link to comment Share on other sites More sharing options...
MikeSharp01 Posted September 28, 2017 Author Share Posted September 28, 2017 Oh er! How did I manage that sorry @PeterStarck Link to comment Share on other sites More sharing options...
NSS Posted October 4, 2017 Share Posted October 4, 2017 Just received our EPC. Scored 96 Link to comment Share on other sites More sharing options...
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