Iceverge

215mm leaf specified by Structural Engineer due to lack of buttressing walls and loadings from precast concrete first floor. Upstairs will be 100/250/100 block/cavity/block. The footprint of the house was designed around these thick walls. Had we needed more space we could have added it in the plans. I ran PHPP with multiple options and was able to achieve 11 kWh/(m²yr) and 8 W/m2 with this amount so I didn't see the need for more. They are lightweight concrete blocks (k value of 0.17 W/(mK)) to help reduce heat loss to the foundations.

Hi All, Welcoming opinions on the below detail. Plaster and Air tightness omitted for now. Aerated concrete blocks shown in light green.

Right, I'll throw my hat in the ring. Its remarkable the things you achieve while your spawn is up at the witching hour sprouting new fangs. I've made a couple of assumptions. External walls 350mm, internal 100mm. All beds in the drawings are 1550x2000 (queen size). I didn't get around to drawing in any storage but I hope the locations I've left will be obvious. I hope you don't mind me changing the upstairs. I've included an extra room here that could be used as an office or sitting room. Failing that, as an extra bedroom should you ever find yourself too old or too drunk, or indeed too old and too drunk to tackle the stairs. Try as I could I wasn't able to fit a bath tub into the family bathroom downstairs at least not in a horizontal orientation. I've included a shower in the upstairs W/C for use with the aforementioned bedroom and as it's opposite the stairs should prove a welcome fallback just in case all lower ones are occupied. As per @Ferdinand suggestion I've endeavoured to extend 3 of the bedrooms into the garden with large doors. And the 45 degree doors seem to have freed up some space @ProDave GROUND FLOOR FIRST FLOOR SOUTH ELEVATION EAST +WEST ELEVATIONS

Hi Hastings, What a lovely project. What is the maximum depth you are prepared to loose from the room? It sounds similar to the Green Building Store retrofit of Stirley farm and I believe MBC have completed a similar project if you look through their facebook photos. They lost a lot of floor space however. How sound are the external walls? Might they be able to take a perimeter ring beam bolted to the stone with compacfoam or similar to create a thermal break? The joists could be hung from this and the external walls then internally insulated (carefully) with a breathable insulation like wood-fiber or lime hemp?