Is this quote for insulation reasonable?

[SchoolOfStone]

We've been trying to get quotes to install roof insulation in our Victorian pitched-roof building. Technically it's a "Room-in-Roof" installation, although the rooms are not remotely habitable yet. We've calculated that we'd need around 80m³ of insulation. Access is easy.

 

After a long delay, we finally received a quote for a Green Homes Grant-eligible installation (figures approximate):

 

Materials ~£9000

Labour ~£500

Sundries ~£1500

Total ~£11000

 

For comparison, we also had a quote from a non-GHG local installer: ~£2250 for both labour and materials.

 

Both quotes seem to be for the same coverage - the former for just under 80m³, the latter for ~30no. sheets of 100mm foam insulation.

 

A very quick search online suggests that 80m³ of 100mm foam insulation on the open market is around £1100 inc. VAT.

 

My questions are therefore:

1. Which quote seems to make more sense?
2. Judging by their vast difference in price, is either quote likely to have missed some crucial factor?
3. Has anyone had any experiences of receiving GHG-eligible quotes for insulation? If so, have they been hugely inflated?

 

Thanks for any advice.

Edited February 16, 2021 by SchoolOfStone

[ProDave]

This just seems to reinforce the impression that as soon as you mention any form of "grant" the prices charged by the installers mysteriously jumps up massively, so most of the grant money just ends up lining the pockets of the installers and not of benefit to the home owner.

 

It is about time this was investigated to see if the tax payer is getting value or not,.

[LA3222]

As soon as I saw £11k I thought bloody hell - Dick Turpins on the loose!

 

£11k...really. As Dave says, as soon as the word Grant appears it is code for 'tax payer subsidy' to whichever charlatan attends a 4 hour course to become an 'accredited' installer of whatever bullshite they are peddling this time.

 

Kingspan is £45/sh for 100mm inc VAT --> 30 sheets is £1350 with free delivery. You can probably get cheaper, Celotex or something - its all the same stuff.

 

£11k - its digusting that they can be allowed to legally rip unsuspecting customers off like this. If it wasn't a 'Grant' scheme they would be on Cowboy traders - legalised criminality.