The smallest extensions can achieve huge gains for an existing building. The two properties here which have just gained planning approval are very different buildings. The first is a barn and you would think following the profile of the existing roof would be the design solution; not so according to conservation. Lean-to forms to barns would have been in this style (for oil storage for example) and not follow the gable form. Who knew? The second is a classical (relatively new) build where the owners wanted a sun room, partially private but with lots of glazing to form a sun room. This was borne out of a love for the garden – but unable to spend time in it in winter months. Both extensions are small but contribute hugely to the inner layouts of the existing spaces.