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Weeks 24 to 27 Windows Installation Choosing window style and supplier has been one of the hardest decisions. We finally decided on Aluclad wooden windows from Norrsken. It’s been a long journey and Norrsken have been with me on that journey since December 2022 to installation end of February 2025. A big thank you to Nick at the window company for sticking with me on my numerous window quotes, that took over 2 years to finalise. Due to my architect not thinking ahead how Part O would effect the design, the windows had quite a few changes and quotations from a few companies. In summary Part O (Overheating) was first published in December 2021, we didn’t submit plans until May 2022, we passed planning in October 2022. Then we realised that the original design wouldn’t pass Part O that’s when I started understanding that in my opinion the architect should have been planning ahead and designing with Part O in mind. We had an overhang in the design but not large enough to qualify as shading for Part O calculations. I spoke to a local company who could do the Dynamic modelling route to pass Part O but they had a backlog of customers who like me needed help to pass Part O some of which we’re probably going to end up spending thousands on solar glazing and various other mitigating factors. The company suggested I look at the simplified version first which basically is a spreadsheet on which you enter your room sizes, window sizes and orientation of the building. Although our windows were not too big the daytime overheating looked like it could be managed by tweaking window sizes a bit but nighttime bedroom overheating was more of a problem because we are a bungalow and the windows needed to open for ventilation but also be secure overnight against intruders whilst we slept, Part O offers some guidance and I found future homes https://www.futurehomes.org.uk/library#Guidancetoolsandtemplates particularly helpful. In the end we settled on replacing 4 windows with 6 large Velux windows that allow for more air flow and by changing some windows to tilt and turn inwards this allows the bedroom windows to be safely partially open in the tilt position whilst still being secure at night. We had to go back through planning for the window changes but the architect did the amendments free of charge and the revised plans were passed in May 2023. I’m happy with the end outcome. I still have lovely big picture windows allowing viewing far into the distance and without any glazing bars. The opening inwards will allow for easy cleaning, but cleaning is a long way off. The Velux windows free up room for kitchen wall units where we previously planed to have non opening windows. A Velux in the pantry as well as freeing up wall space for shelves lets more light in and probably will result in less switching a light on and off. The house is designed for us in that our en-suite is larger than the bathroom shared by the two guest bedrooms and by changing that window to a Velux it allows for a shower area that doesn’t have a window sill almost in it. I started researching windows quite early on because I wanted to make the most of the views but also I expected it to take a while actually getting round to see different companies. We moved to Cornwall to start a new business, have a field for our Greyhound to run in and be a bit warmer and sunnier than Manchester. I love living in Cornwall but it does have its downsides in that we live one and a half hours away from a motorway, our local home building shows are smaller than one hall of Birmingham NEC. We visited some of the local window suppliers but we mostly got to see one small window or a cut away demo window for each supplier and they didn’t offer a great deal in choice, mostly double glazed not triple glazed samples. If we went away for the weekend I would try to find a larger showroom we could stop at on the way, luckily for us Norrsken has one showroom in the UK near Bournemouth that we stopped at on the way to The Isle of White. We decided to get the window openings measured by the supplier, it cost approximately £800 for this but it was worth it. I had some questions about window opening sizes during the build before the concrete pour and Nick helped answering all my little questions, he knew how the window sizes had been changed to pass Part O. Even though the person sent out to measure ended up having a hour and half travel delay he still spent over 3 hours measuring and discussing the window location within the ICF opening and we marked on where I was to put the EPDM so it would be under the window and coming up the inside at the window board. The ICF is capable of load bearing the windows and fastening them back to the concrete core but the windows were going to be big and heavy (they come fully glazed) so we decided to use stokbord at the base of each window as our ICF was still soft enough that you could make an indent with just your finger (much like PIR) so when the weight of the window was resting on a shim it could push the shim into the ICF and general handling during installation could cause indents in the ICF. We used 3mm stocbord under the windows and 12mm under the sliding door. The 3 windows that look down the field were levelled and measured using a laser to ensure they would be the same height from the floor, and again a laser was used at installation. On installation day the fitters arrived at about 8am and the windows arrived shortly after, it was a great feeling that we were finally going to be watertight and to see our chosen windows. The installation team were all great you could tell they all had a role during the installation, Illbruck FM330 airtight foam was used and Silka EBT+ sealant. I am now taping the windows inside and out using Pro Clima tapes. We purchased 10 windows (4 non opening, 6 Tilt and Turn) and a sliding door. Windows P33A, 10 windows average uW.80 Sliding door S319A 2m wide uW 0.76 Aluminium clad, Marine Finish, Trip,e glazed. External colour 7030 Stone Grey Matt Internal white stain Breakdown of window costs Windows £11,500 Sliding door £3500 Sills and trims £740 Installation £2600 Stocbord £500 Survey £750 Delivery by small HIAB £1320 Total to date £207,626 I have been continuing the installation of the Rockwool in between the rafters and building the gabion wall when the weather is nice. I researched and purchased a plasterboard lifter that will reach 16ft and a table saw for the insulation under the rafters. The renderer is booked in for May, colours chosen. The wood cladding is ordered and ready for final payment so hopefully the next blog will cover the cladding.