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It will be built on site and insulated myself. Just using Scotframe as an initial guide for pricing. Thanks Mike, by putting in everything from render to plaster it does indeed come down to 0.15-0.16 with 30-40mm PIR.

I have just noticed the 3* open has 140mm Frametherm + 25mm PU. This would still be less than 140mm PU though I'd have thought?

I am still costing up my build and I am looking for advice on insulation. House will be timber frame with a block + render skin. Working off Scotframe spec as a guide to follow their 4* or 3* build. I am slightly unsure on the external walls though, they show 140mm Frametherm 32 on the 3* open and 140mm PU on the 3* closed . Both show with a U' Value W/m2K of 0.15. If I try this on an online U calc, I get 0.15 for PU, 0.13 for PIR and 0.23 for glasswool. Any ideas?

Thanks for the suggestions everyone. Yes the view can be seen from the ground floor. The downstairs bedroom could be excluded yes, the problem is see is that it would leave a huge lounge. I also envisage that we will spend the majority of our time in the kitchen/family and see the lounge as a more formal room. The garage to the east doesnt really work that well as the driveway will approach from the west side. I will have a play around with flipping the downstairs layout, putting the kitchen family room the western side.

Basically there are very nice views North, hence why all the main rooms of the house face that way. I take your point regarding the sun, however there are not many options (except as you said, removing the the garage).

Hello, I am from Dumfries and Galloway, wet and windy West coast. Any general comments from people who have been through the process to be honest. I am quite happy with the interior layout overall, once the 4th bed is added upstairs. Maybe utilise under stairs for a shoe/jacket cupboard. Insulation, nothing decided yet. The kit will be home made. Probably looking at 150mm PIR in the kit, maybe same in the floor and then wool in the loft/attic spaces. The 'front' of the house is the North elevation, so the view out the kitchen, family room and lounge are all due north. Yes the hip roof will be changed to a normal gable, giving a long 1.5 storey coombed bedroom. I have some concerns about the cladding. Mainly due to the amount of trims needed around each window, adding to the cost. Also, is it possible to finish it half way up a wall? Do you get render stop beads big enough to come out past the cladding?

Hello guys, I am new here and was looking for some feedback on my plans for a self build. In the plans shown there is a hip roof on the garage. This will be removed to allow a 4th bedroom in the space above the garage. Thanks for any comments.