Dormers in new housing are often the result of an attempt to provide habitable accommodation within the roof space. This makes them over-dominant in the composition. It is often preferable to include this accommodation within the main volume of the house by raising the eaves level. Dormers should be a minor incident in the roof plane. Their purpose should be to light the roof-space, not to gain extra headroom over any great width. They should not be located close to verges or hips and should have gabled, cat-slide or flat lead roofs. Rooflights should be used sparingly. They should appear on rear elevations only and not in conjunction with dormers.