Designing the Window Seat: Passive Shading and Thermal Detail at the Inside-Out House

Oct 14

Inside the Design: The Window Seat at the Inside-Out House

The deep-reveal window seat at the Inside-Out House quickly became one of the defining features of the project - and, as it turned out, our most-watched video on social media.

In the clip below, Ben walks through how the detail works in everyday life. Beyond creating a generous nook to sit and connecting the kitchen directly to the garden, the deep reveal serves a vital environmental purpose: providing passive solar shading to mitigate summer heat gain while welcoming lower winter sunlight into the home.

The Technical Build-Up

To achieve the balance of comfort, aesthetics, and high thermal efficiency, the detail was designed around core Passivhaus principles:

Insulation Strategy: The wall utilises a timber-frame structure with high-performance insulation between the studs. A continuous layer of internal insulation runs over the internal face and laps directly over the window frame to eliminate thermal bridging.
Airtightness & Junctions: The airtight membrane is seamlessly dressed up and into the frame, with the frame itself specified in two pieces to accommodate the insulation build-up cleanly.
Performance: The overall detail significantly outperforms standard Building Regulations requirements, maintaining internal surface temperatures year-round.

It’s a clear example of how thoughtful architectural detailing can work twice as hard - delivering everyday liveability alongside low-energy building performance.

Watch the short video below to see the space in action: