Certified PassivHaus Consultants & Sustainable Building Consultants for SAP, SBEM, Air Tightness Testing and more...
East Midlands, England
Joined April 2010
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Windows in Part L1 2026 - SAP 10.3 good news: solar control glass (low g-value) no longer penalises your energy calculation. The notional g-value now matches the proposed window. No more conflict between SAP and overheating compliance. buff.ly/TFRwHGz #PartL2026 #SAP103
Under Part L 2026, the SAP assessor sets the U-value target for windows — but the supplier must confirm compliance using the new methodology. 4 questions to ask before you fix the spec: buff.ly/TFRwHGz #PartL2026 #FutureHomesStandard
Windows in Part L1 2026 - The methodology change (same window, higher U-value). Part L 2026 requires actual size + full component calculations — Georgian bars alone can push a 1.27 to 1.60 W/m²K. Full breakdown: buff.ly/TFRwHGz #PartL2026 #FutureHomesStandard
Part O Overheating - When you need TM59 instead. The Simplified Method fails your design? It isn't the end of the road. TM59 dynamic simulation opens up larger glazing, external shading and solar glass, ventilation. When to switch routes: buff.ly/RYa2Tex #TM59
Part O Overheating - What the Simplified Method can't credit Planning to rely on internal blinds or external shutters, MVHR, AC or blinds to pass Part O? The Simplified Method can't credit any of them. What this means for your design: buff.ly/RYa2Tex #PartO
Part O Overheating - What counts as glazing (only the glass)
What counts as glazing (only the glass) - Measuring the whole window. Only the clear glass counts, not the frame. Typically, the glass is around 70% of the total window opening: buff.ly/RYa2Tex #PartO
The west-facing glazing trap for Overheating - A west-facing 100m² house with cross-ventilation gets just 11m² of total glazing under Part O. That goes fast once you count living room windows, door glazing and rooflights. Why orientation matters: buff.ly/RYa2Tex #PartO
Since June 2022, every new home in England has to prove it won't overheat. For most standard houses, that starts with the Simplified Method under Part O. Here's what it actually checks, in plain English: buff.ly/RYa2Tex #PartO
More insulation = more overheating risk. That's the common assumption. Our TM59 study says otherwise. Cavity wall: 29% fewer overheating hours in bedrooms vs timber frame. Improved insulation slows heat flow from outside to in. .Full study 👇
buff.ly/lwodyT8
If you are thinking of a battery system with or without PV on your roof to help manage your home energy, then this podcast by Everything Electric podcast is well worth a listen. Duracell Energy – Home Energy Independence! - Everything Electric buff.ly/tokPNVc
#architects this is worth a read for sustainable design & Specification HPH399: The Good Building Book – with Jon Broome and Nick Grant... - House Planning Help buff.ly/RfLsij2
South Oxfordshire's Planning Policy DES10 requires a 40% reduction in carbon emissions for new planning applications — calculated using SAP by an accredited assessor.
We hit 42% on a 3-bed detached in Cholsey using fabric-first & air source heat pump
🔗 buff.ly/vu2ml2U
Post 3 of 3 We have a 100% pass rate on overglazed extension SAP assessments — no redesigns required.
Plain English guide to how it works, what your options are, and how to get started:
buff.ly/O4QA3pw
#PartL #BuildingRegulations #SAP #HomeExtension #GlazedExtension
Post 2 of 3 Under Part L, there's a route called the whole-dwelling SAP calculation.
It models the full house + extension and compares carbon emissions against a standard compliant design.
buff.ly/O4QA3pw
We has passed projects at 73% glazing.
#GlazedExtension
Post 1 of 3 Your architect says your extension has too much glazing.
Before assuming you need to redesign — read this:
buff.ly/O4QA3pw
The 25% glazing rule for extensions isn't the end of the road. 🧵
#PartL #BuildingRegulations #SAP #HomeExtension #GlazedExtension
Post 1 of 3 Your architect says your extension has too much glazing.
Before assuming you need to redesign — read this.
lowcarbonbox.co.uk/your-exte…
The 25% glazing rule for extensions isn't the end of the road. 🧵
#PartL #BuildingRegulations #SAP #HomeExtension #GlazedExtension
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Low Carbon Box retweeted
Just turned 30! 🎂
This past year has been transformative for my work at Tool Finder. We're evolving from a content site into a software company, and it's super exciting!
Although the last year has been full of change, I appreciate all the support.
Entering my 30s with this new vision and exciting plans is a new challenge I'm buzzing about.
PS. Clearly, my present was @todoist week view.
