该住宅位于伦敦市中心的一栋双层建筑内，设有两间卧室。由于业主夫妇有了第二个孩子，因此需要更多的居住空间。碍于购买三居室的昂贵价格，他们决定研究如何在现有的房子里创造更多的空间。

The clients owned the existing two-storey, two-bedroom property, located on a central London Housing Estate. With a second baby on the way, they needed more space. Priced out of three-bedroom properties in the area they decided to investigate what could be done to create more space in their existing home.

▼住宅外观，exterior view ©French + Tye

该住宅区与其他地段有所不同，无法获得加建单层阁楼的许可。业主提出的规划申请遭到了两次拒绝：扩建后的建筑高度不允许超过现有屋顶的最高点。

The challenge with this property, unlike others on the estate, they were unable to secure planning permission for a single-storey loft extension. They received two planning refusals since they were not permitted to build any higher than the highest point of the existing roof, due to its lower profile.

▼一层起居空间，first floor living area ©French + Tye

设计师为此采取了“连锁拼接”的方法，在“一层半”的高度上创造了两个互锁的楼层。尽管增加的面积并不多，但通过创造性的使用方法，一间新的卧室被打造出来，同时既有房屋也获得了更多的空间。

We approached the design as an interlocking jigsaw. We knew the half-height of the loft was fixed so the design was all about creating two interlocking floor levels in the space of one and a half floors. We may have given less footprint, but we created more volume and an additional bedroom by using it creatively.

▼设计示意图 – 剖面，original design – section ©Bradley Van Der Straeten