A feature slot rooflight fills the kitchen/dining space with natural daylight, while folding doors open the space to the garden and the picturesque views. The extension is highly insulated throughout, coupled with underfloor heating this creates a comfortable living space throughout the year, while the roof projects over the window and doors to control solar gain during warmer weather. The extension also helps to contain heat loss through the fabric of the original cottage, reducing energy consumption and heating costs.