Andeh

Great progress, how are you getting on from a £/2sqm investment into the build? Loving it coming together

Hmmm... Does seem excessive that doesn't it? I'll query it... He was actually quite reasonably priced on some other tweaks we made (roof lights & internal brick walls...) so maybe I'm missing something! Thanks

Big, but not that big... 250sqm! He gave us a spectacularly keen price to start off with, so not unexpected some of the upgrades come at a premium.

Going through similar ourself. 100mm PIR gets a u value of around 0.18 (I think) , 125mm gets you a 0.14, 150mm drops it to around 0.11ish. Law of diminishing returns & cost needs to be factored in, and its prob several years+ payback. Anything more then 150mm is overkill for 90% of people (IMHO)... But this is a forum for enthusiasts! However, if you can... I'd always opt for more. We are just facing a £4500 bill (builder supply, fit & overheads) to upgrade from 100 to 150mm in our bungalow, as build already well under way! Probably will, but its a tough call balencing all other aspects of the build costs

Woweee....! What an emotional roller coaster. Love to see what it looks like completed.

....i wouldnt feel confident of not having to back date those payments.

Buildzone was £2600 for us for 275sqm brick & block, mono pitch. LABC wanted £7500!

Thank you very much Mr Punter, that makes much more sense on a comparison point of view! Very grateful.

Sorry to bump my own comment, but im still trying to get my head around this? Have they really dropped the numbers by nearly half in some of these contexts? Vs current PART L values?

U value of 0.13 and 0.11 for flooring and ceilings, then 0.18 for walls seems a large step up from current which is nearly double some of these figures? Or am I reading it wrong? (page 12)

That was an avenue we are/were exploring as well. Even got a SAP done for Gas & ASHP separately....... hoping it is no longer required (much like yourself). I *think* we are in the clear...providing my/your builder is MCS setup.

Thanks J1mbo, looks like we are OK with being a new build property then, I think! (just re-read your post & good to see your agreement!!) Now I am worried if my builder, or equiv who he uses, is MCS Registered!

Has anyone seen anything official on eligibility for the £5k grant?

Thanks buzz, depth isn't an issue for us (but is for OP), so going after u value over depth. I presume EPS is less effective then PIR if it is cheaper?

Try being in a bungalow! ? I defaulted to "1" for mine, but moved it back to a mid point before linking to OP! & yes, this forum is a huge wealth of information. Always be mindful though, whilst this place is full of hugely knowledgeable & helpful people, kind enough to help & advise others... Don't forget most of them are also enthusiasts! Where their "normal" is a loooong step away from normal normal. I live my life on here trying to achieve better then normal, but accepting I am likely below average for buildhub!! ?

We're locked into a builder now, so there will be a kick in the teeth changing spec he has quoted against (supply & fitment) not to mention peak pricing on materials across the board.

This is a useful tool to have a play around with. 100mm is actually 0.14, vs the build regs expectation of 0.25...which drops to 0.18 in next years uplift. So, in a nut shell...100mm is still very good & will give you a very warm house. 125mm is even better....150mm even better....etc etc....hardest point with all of this is when 'enough is enough'. Calculator (uvalue-calculator.co.uk)

Yep, I'm 100% in the same situation! And fully agree in terms of the impact only increasing long term with energy prices. We have 150mm specified (0.11) but there is a £4500 saving if we brought it down to 100mm....(0.18 I think).... we'll prob settle in the middle on 125mm for a £2000 saving for use in the countless other areas I want to try and put more money into. Especially more tangible areas like wanting vaulted ceilings, bigger windows, larger sliding doors etc etc. 100mm still achieves current building regs & in my research also looks like it will still exceed next year's building regs uplift as well. As ever more the merrier & I'd love to go uber insulated... But it becomes increasingly hard to convince myself & the wife when we look at the impacted value... Hence the "maybe another £10 cheaper per month!?" As we're a bungalow, we get hit even harder on sheer surface area to bleed heat through.... And cost to try and mitigate!

125mm should get you to 0.13, 150mm to get to 0.11. Reality is in this range of insulation your spending £1000s to save £10s.

We have received the SAP numbers that are around 10-25% improved to the "high numbers" as above (current regulations), in theory averaging out to comfortably pass the June '22 (next gen regulations) numbers as well. Going a meaningful step further is a £10k bill from the builder, which we can't afford sadly! Joys of going with a large bungalow !

Thanks for the quick reply & just so I am clear ...the lower values (Wall 0.26, Floor 0.18, Roof 0.16) are the bare minimum required for new AD L - June '22? The ones our SAP report showed (0.30, 0.25, 0.20) are the current regulations?

Hi All, Just some general confirmations please! Am i right in thinking the current regs for new dwellings are: Wall 0.26, Floor 0.18, Roof 0.16? Air Permeability of 8m^3...however for the Consultation version January 2021....they are not actually changing, as they are detailed as: Wall 0.26, Floor 0.18, Roof 0.16 in this document as well? However on our SAP report he details 0.30 for Walls, 0.25 for Floor and 0.20 for roof? Can anyone unconfuse me please?

Pretty much this! If you can afford the time shop around for the cheapest & have the fallback of if cheapie quote misses something or isn't clear & clarification is required then it'll cost you a couple of weeks & top up fee potentially. We used architects recommendations, knowing they were generally more expensive then my Google-fu could find... But all were known good quality, user friendly & got us through planning 1st time. Bat's, trees, highway hurdles & all!!

Thanks very much all! Turns out SAP calculator chap used the wrong figure for the floor.... it should be 0.11, not 0.17, as designed. Jetfloor likely to be replaced as insufficient height for it, alternatives tbc to achieve this. Seems the walls are a tiny bit over as well but not massively. Roof is at 0.18 correctly. All others are assumed values for boiler (or ASHP more likely), MVHR, windows, hw tank, etc so might squeeze some extra there. We're expecting named units/known specifications in January, so will review it again then. Builder suggesting around £4k for roof top up and another £4k to beef up wall insulation to meaningful differences (ie extra 50mm+) which makes a very unappealing deal with everything else going on. We're being hammered on the price increases anyway, so one to accept as is & move on sadly. Thank you again for the feedback everyone... The joy of wanting uber grand designs on an insufficient budget!!

Also a thought for me!